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 (test_and_clear_bit(1, &cdev->private->registered)) {
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 ((cdev->private->state != DEV_STATE_OFFLINE &&
533 cdev->private->state != DEV_STATE_ONLINE &&
534 cdev->private->state != DEV_STATE_BOXED &&
535 cdev->private->state != DEV_STATE_DISCONNECTED) ||
536 atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
539 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
540 atomic_set(&cdev->private->onoff, 0);
543 if (!strncmp(buf, "force\n", count)) {
549 ret = strict_strtoul(buf, 16, &i);
555 ret = online_store_handle_offline(cdev);
558 ret = online_store_handle_online(cdev, force);
565 module_put(cdev->drv->owner);
566 atomic_set(&cdev->private->onoff, 0);
567 return (ret < 0) ? ret : count;
571 available_show (struct device *dev, struct device_attribute *attr, char *buf)
573 struct ccw_device *cdev = to_ccwdev(dev);
574 struct subchannel *sch;
576 if (ccw_device_is_orphan(cdev))
577 return sprintf(buf, "no device\n");
578 switch (cdev->private->state) {
579 case DEV_STATE_BOXED:
580 return sprintf(buf, "boxed\n");
581 case DEV_STATE_DISCONNECTED:
582 case DEV_STATE_DISCONNECTED_SENSE_ID:
583 case DEV_STATE_NOT_OPER:
584 sch = to_subchannel(dev->parent);
586 return sprintf(buf, "no path\n");
588 return sprintf(buf, "no device\n");
590 /* All other states considered fine. */
591 return sprintf(buf, "good\n");
595 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
596 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
597 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
598 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
599 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
600 static DEVICE_ATTR(online, 0644, online_show, online_store);
601 static DEVICE_ATTR(availability, 0444, available_show, NULL);
603 static struct attribute *io_subchannel_attrs[] = {
604 &dev_attr_chpids.attr,
605 &dev_attr_pimpampom.attr,
609 static struct attribute_group io_subchannel_attr_group = {
610 .attrs = io_subchannel_attrs,
613 static struct attribute * ccwdev_attrs[] = {
614 &dev_attr_devtype.attr,
615 &dev_attr_cutype.attr,
616 &dev_attr_modalias.attr,
617 &dev_attr_online.attr,
618 &dev_attr_cmb_enable.attr,
619 &dev_attr_availability.attr,
623 static struct attribute_group ccwdev_attr_group = {
624 .attrs = ccwdev_attrs,
627 static const struct attribute_group *ccwdev_attr_groups[] = {
632 /* this is a simple abstraction for device_register that sets the
633 * correct bus type and adds the bus specific files */
634 static int ccw_device_register(struct ccw_device *cdev)
636 struct device *dev = &cdev->dev;
639 dev->bus = &ccw_bus_type;
640 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
641 cdev->private->dev_id.devno);
644 ret = device_add(dev);
648 set_bit(1, &cdev->private->registered);
652 static int match_dev_id(struct device *dev, void *data)
654 struct ccw_device *cdev = to_ccwdev(dev);
655 struct ccw_dev_id *dev_id = data;
657 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
660 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
664 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
666 return dev ? to_ccwdev(dev) : NULL;
669 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
673 if (test_bit(1, &cdev->private->registered)) {
674 device_release_driver(&cdev->dev);
675 ret = device_attach(&cdev->dev);
676 WARN_ON(ret == -ENODEV);
681 ccw_device_release(struct device *dev)
683 struct ccw_device *cdev;
685 cdev = to_ccwdev(dev);
686 /* Release reference of parent subchannel. */
687 put_device(cdev->dev.parent);
688 kfree(cdev->private);
692 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
694 struct ccw_device *cdev;
696 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
698 cdev->private = kzalloc(sizeof(struct ccw_device_private),
699 GFP_KERNEL | GFP_DMA);
704 return ERR_PTR(-ENOMEM);
707 static void ccw_device_todo(struct work_struct *work);
709 static int io_subchannel_initialize_dev(struct subchannel *sch,
710 struct ccw_device *cdev)
712 cdev->private->cdev = cdev;
713 atomic_set(&cdev->private->onoff, 0);
714 cdev->dev.parent = &sch->dev;
715 cdev->dev.release = ccw_device_release;
716 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
717 cdev->dev.groups = ccwdev_attr_groups;
718 /* Do first half of device_register. */
719 device_initialize(&cdev->dev);
720 if (!get_device(&sch->dev)) {
721 /* Release reference from device_initialize(). */
722 put_device(&cdev->dev);
728 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
730 struct ccw_device *cdev;
733 cdev = io_subchannel_allocate_dev(sch);
735 ret = io_subchannel_initialize_dev(sch, cdev);
742 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
744 static void sch_create_and_recog_new_device(struct subchannel *sch)
746 struct ccw_device *cdev;
748 /* Need to allocate a new ccw device. */
749 cdev = io_subchannel_create_ccwdev(sch);
751 /* OK, we did everything we could... */
752 css_sch_device_unregister(sch);
755 /* Start recognition for the new ccw device. */
756 io_subchannel_recog(cdev, sch);
760 * Register recognized device.
762 static void io_subchannel_register(struct ccw_device *cdev)
764 struct subchannel *sch;
768 sch = to_subchannel(cdev->dev.parent);
770 * Check if subchannel is still registered. It may have become
771 * unregistered if a machine check hit us after finishing
772 * device recognition but before the register work could be
775 if (!device_is_registered(&sch->dev))
777 css_update_ssd_info(sch);
779 * io_subchannel_register() will also be called after device
780 * recognition has been done for a boxed device (which will already
781 * be registered). We need to reprobe since we may now have sense id
784 if (device_is_registered(&cdev->dev)) {
786 ret = device_reprobe(&cdev->dev);
788 /* We can't do much here. */
789 CIO_MSG_EVENT(0, "device_reprobe() returned"
790 " %d for 0.%x.%04x\n", ret,
791 cdev->private->dev_id.ssid,
792 cdev->private->dev_id.devno);
797 * Now we know this subchannel will stay, we can throw
798 * our delayed uevent.
800 dev_set_uevent_suppress(&sch->dev, 0);
801 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
802 /* make it known to the system */
803 ret = ccw_device_register(cdev);
805 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
806 cdev->private->dev_id.ssid,
807 cdev->private->dev_id.devno, ret);
808 spin_lock_irqsave(sch->lock, flags);
809 sch_set_cdev(sch, NULL);
810 spin_unlock_irqrestore(sch->lock, flags);
811 /* Release initial device reference. */
812 put_device(&cdev->dev);
816 cdev->private->flags.recog_done = 1;
817 wake_up(&cdev->private->wait_q);
819 if (atomic_dec_and_test(&ccw_device_init_count))
820 wake_up(&ccw_device_init_wq);
823 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
825 struct subchannel *sch;
827 /* Get subchannel reference for local processing. */
828 if (!get_device(cdev->dev.parent))
830 sch = to_subchannel(cdev->dev.parent);
831 css_sch_device_unregister(sch);
832 /* Release subchannel reference for local processing. */
833 put_device(&sch->dev);
837 * subchannel recognition done. Called from the state machine.
840 io_subchannel_recog_done(struct ccw_device *cdev)
842 if (css_init_done == 0) {
843 cdev->private->flags.recog_done = 1;
846 switch (cdev->private->state) {
847 case DEV_STATE_BOXED:
848 /* Device did not respond in time. */
849 case DEV_STATE_NOT_OPER:
850 cdev->private->flags.recog_done = 1;
851 /* Remove device found not operational. */
852 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
853 if (atomic_dec_and_test(&ccw_device_init_count))
854 wake_up(&ccw_device_init_wq);
856 case DEV_STATE_OFFLINE:
858 * We can't register the device in interrupt context so
859 * we schedule a work item.
861 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
866 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
868 struct ccw_device_private *priv;
870 cdev->ccwlock = sch->lock;
872 /* Init private data. */
873 priv = cdev->private;
874 priv->dev_id.devno = sch->schib.pmcw.dev;
875 priv->dev_id.ssid = sch->schid.ssid;
876 priv->schid = sch->schid;
877 priv->state = DEV_STATE_NOT_OPER;
878 INIT_LIST_HEAD(&priv->cmb_list);
879 init_waitqueue_head(&priv->wait_q);
880 init_timer(&priv->timer);
882 /* Increase counter of devices currently in recognition. */
883 atomic_inc(&ccw_device_init_count);
885 /* Start async. device sensing. */
886 spin_lock_irq(sch->lock);
887 sch_set_cdev(sch, cdev);
888 ccw_device_recognition(cdev);
889 spin_unlock_irq(sch->lock);
892 static int ccw_device_move_to_sch(struct ccw_device *cdev,
893 struct subchannel *sch)
895 struct subchannel *old_sch;
898 old_sch = to_subchannel(cdev->dev.parent);
899 /* Obtain child reference for new parent. */
900 if (!get_device(&sch->dev))
902 mutex_lock(&sch->reg_mutex);
903 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
904 mutex_unlock(&sch->reg_mutex);
906 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
907 cdev->private->dev_id.ssid,
908 cdev->private->dev_id.devno, sch->schid.ssid,
909 sch->schib.pmcw.dev, rc);
910 /* Release child reference for new parent. */
911 put_device(&sch->dev);
914 /* Clean up old subchannel. */
915 if (!sch_is_pseudo_sch(old_sch)) {
916 spin_lock_irq(old_sch->lock);
917 sch_set_cdev(old_sch, NULL);
918 cio_disable_subchannel(old_sch);
919 spin_unlock_irq(old_sch->lock);
920 css_schedule_eval(old_sch->schid);
922 /* Release child reference for old parent. */
923 put_device(&old_sch->dev);
924 /* Initialize new subchannel. */
925 spin_lock_irq(sch->lock);
926 cdev->private->schid = sch->schid;
927 cdev->ccwlock = sch->lock;
928 if (!sch_is_pseudo_sch(sch))
929 sch_set_cdev(sch, cdev);
930 spin_unlock_irq(sch->lock);
931 if (!sch_is_pseudo_sch(sch))
932 css_update_ssd_info(sch);
936 static int ccw_device_move_to_orph(struct ccw_device *cdev)
938 struct subchannel *sch = to_subchannel(cdev->dev.parent);
939 struct channel_subsystem *css = to_css(sch->dev.parent);
941 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
944 static void io_subchannel_irq(struct subchannel *sch)
946 struct ccw_device *cdev;
948 cdev = sch_get_cdev(sch);
950 CIO_TRACE_EVENT(6, "IRQ");
951 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
953 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
956 void io_subchannel_init_config(struct subchannel *sch)
958 memset(&sch->config, 0, sizeof(sch->config));
959 sch->config.csense = 1;
960 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
961 if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0)
965 static void io_subchannel_init_fields(struct subchannel *sch)
967 if (cio_is_console(sch->schid))
970 sch->opm = chp_get_sch_opm(sch);
971 sch->lpm = sch->schib.pmcw.pam & sch->opm;
972 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
974 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
975 " - PIM = %02X, PAM = %02X, POM = %02X\n",
976 sch->schib.pmcw.dev, sch->schid.ssid,
977 sch->schid.sch_no, sch->schib.pmcw.pim,
978 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
980 io_subchannel_init_config(sch);
984 * Note: We always return 0 so that we bind to the device even on error.
985 * This is needed so that our remove function is called on unregister.
987 static int io_subchannel_probe(struct subchannel *sch)
989 struct ccw_device *cdev;
992 if (cio_is_console(sch->schid)) {
993 rc = sysfs_create_group(&sch->dev.kobj,
994 &io_subchannel_attr_group);
996 CIO_MSG_EVENT(0, "Failed to create io subchannel "
997 "attributes for subchannel "
998 "0.%x.%04x (rc=%d)\n",
999 sch->schid.ssid, sch->schid.sch_no, rc);
1001 * The console subchannel already has an associated ccw_device.
1002 * Throw the delayed uevent for the subchannel, register
1003 * the ccw_device and exit.
1005 dev_set_uevent_suppress(&sch->dev, 0);
1006 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1007 cdev = sch_get_cdev(sch);
1008 cdev->dev.groups = ccwdev_attr_groups;
1009 device_initialize(&cdev->dev);
1010 ccw_device_register(cdev);
1012 * Check if the device is already online. If it is
1013 * the reference count needs to be corrected since we
1014 * didn't obtain a reference in ccw_device_set_online.
1016 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1017 cdev->private->state != DEV_STATE_OFFLINE &&
1018 cdev->private->state != DEV_STATE_BOXED)
1019 get_device(&cdev->dev);
1022 io_subchannel_init_fields(sch);
1023 rc = cio_commit_config(sch);
1026 rc = sysfs_create_group(&sch->dev.kobj,
1027 &io_subchannel_attr_group);
1030 /* Allocate I/O subchannel private data. */
1031 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1032 GFP_KERNEL | GFP_DMA);
1035 css_schedule_eval(sch->schid);
1039 spin_lock_irq(sch->lock);
1040 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1041 spin_unlock_irq(sch->lock);
1046 io_subchannel_remove (struct subchannel *sch)
1048 struct ccw_device *cdev;
1049 unsigned long flags;
1051 cdev = sch_get_cdev(sch);
1054 /* Set ccw device to not operational and drop reference. */
1055 spin_lock_irqsave(cdev->ccwlock, flags);
1056 sch_set_cdev(sch, NULL);
1057 cdev->private->state = DEV_STATE_NOT_OPER;
1058 spin_unlock_irqrestore(cdev->ccwlock, flags);
1059 ccw_device_unregister(cdev);
1061 kfree(sch->private);
1062 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1066 static void io_subchannel_verify(struct subchannel *sch)
1068 struct ccw_device *cdev;
1070 cdev = sch_get_cdev(sch);
1072 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1075 static int check_for_io_on_path(struct subchannel *sch, int mask)
1077 if (cio_update_schib(sch))
1079 if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
1084 static void terminate_internal_io(struct subchannel *sch,
1085 struct ccw_device *cdev)
1087 if (cio_clear(sch)) {
1088 /* Recheck device in case clear failed. */
1091 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1093 css_schedule_eval(sch->schid);
1096 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1097 /* Request retry of internal operation. */
1098 cdev->private->flags.intretry = 1;
1101 cdev->handler(cdev, cdev->private->intparm,
1105 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1107 struct ccw_device *cdev;
1109 cdev = sch_get_cdev(sch);
1112 if (check_for_io_on_path(sch, mask)) {
1113 if (cdev->private->state == DEV_STATE_ONLINE)
1114 ccw_device_kill_io(cdev);
1116 terminate_internal_io(sch, cdev);
1117 /* Re-start path verification. */
1118 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1121 /* trigger path verification. */
1122 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1126 static int io_subchannel_chp_event(struct subchannel *sch,
1127 struct chp_link *link, int event)
1131 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1138 io_subchannel_terminate_path(sch, mask);
1143 io_subchannel_verify(sch);
1146 if (cio_update_schib(sch))
1148 io_subchannel_terminate_path(sch, mask);
1151 if (cio_update_schib(sch))
1153 sch->lpm |= mask & sch->opm;
1154 io_subchannel_verify(sch);
1161 io_subchannel_shutdown(struct subchannel *sch)
1163 struct ccw_device *cdev;
1166 cdev = sch_get_cdev(sch);
1168 if (cio_is_console(sch->schid))
1170 if (!sch->schib.pmcw.ena)
1171 /* Nothing to do. */
1173 ret = cio_disable_subchannel(sch);
1175 /* Subchannel is disabled, we're done. */
1177 cdev->private->state = DEV_STATE_QUIESCE;
1179 cdev->handler(cdev, cdev->private->intparm,
1181 ret = ccw_device_cancel_halt_clear(cdev);
1182 if (ret == -EBUSY) {
1183 ccw_device_set_timeout(cdev, HZ/10);
1184 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1186 cio_disable_subchannel(sch);
1189 static int device_is_disconnected(struct ccw_device *cdev)
1193 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1194 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1197 static int recovery_check(struct device *dev, void *data)
1199 struct ccw_device *cdev = to_ccwdev(dev);
1202 spin_lock_irq(cdev->ccwlock);
1203 switch (cdev->private->state) {
1204 case DEV_STATE_DISCONNECTED:
1205 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1206 cdev->private->dev_id.ssid,
1207 cdev->private->dev_id.devno);
1208 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1211 case DEV_STATE_DISCONNECTED_SENSE_ID:
1215 spin_unlock_irq(cdev->ccwlock);
1220 static void recovery_work_func(struct work_struct *unused)
1224 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1226 spin_lock_irq(&recovery_lock);
1227 if (!timer_pending(&recovery_timer)) {
1228 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1230 mod_timer(&recovery_timer, jiffies +
1231 recovery_delay[recovery_phase] * HZ);
1233 spin_unlock_irq(&recovery_lock);
1235 CIO_MSG_EVENT(4, "recovery: end\n");
1238 static DECLARE_WORK(recovery_work, recovery_work_func);
1240 static void recovery_func(unsigned long data)
1243 * We can't do our recovery in softirq context and it's not
1244 * performance critical, so we schedule it.
1246 schedule_work(&recovery_work);
1249 static void ccw_device_schedule_recovery(void)
1251 unsigned long flags;
1253 CIO_MSG_EVENT(4, "recovery: schedule\n");
1254 spin_lock_irqsave(&recovery_lock, flags);
1255 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1257 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1259 spin_unlock_irqrestore(&recovery_lock, flags);
1262 static int purge_fn(struct device *dev, void *data)
1264 struct ccw_device *cdev = to_ccwdev(dev);
1265 struct ccw_dev_id *id = &cdev->private->dev_id;
1267 spin_lock_irq(cdev->ccwlock);
1268 if (is_blacklisted(id->ssid, id->devno) &&
1269 (cdev->private->state == DEV_STATE_OFFLINE)) {
1270 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1272 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1274 spin_unlock_irq(cdev->ccwlock);
1275 /* Abort loop in case of pending signal. */
1276 if (signal_pending(current))
1283 * ccw_purge_blacklisted - purge unused, blacklisted devices
1285 * Unregister all ccw devices that are offline and on the blacklist.
1287 int ccw_purge_blacklisted(void)
1289 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1290 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1294 void ccw_device_set_disconnected(struct ccw_device *cdev)
1298 ccw_device_set_timeout(cdev, 0);
1299 cdev->private->flags.fake_irb = 0;
1300 cdev->private->state = DEV_STATE_DISCONNECTED;
1302 ccw_device_schedule_recovery();
1305 void ccw_device_set_notoper(struct ccw_device *cdev)
1307 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1309 CIO_TRACE_EVENT(2, "notoper");
1310 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1311 ccw_device_set_timeout(cdev, 0);
1312 cio_disable_subchannel(sch);
1313 cdev->private->state = DEV_STATE_NOT_OPER;
1316 enum io_sch_action {
1320 IO_SCH_UNREG_ATTACH,
1328 static enum io_sch_action sch_get_action(struct subchannel *sch)
1330 struct ccw_device *cdev;
1332 cdev = sch_get_cdev(sch);
1333 if (cio_update_schib(sch)) {
1334 /* Not operational. */
1336 return IO_SCH_UNREG;
1337 if (!ccw_device_notify(cdev, CIO_GONE))
1338 return IO_SCH_UNREG;
1339 return IO_SCH_ORPH_UNREG;
1343 return IO_SCH_ATTACH;
1344 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1345 if (!ccw_device_notify(cdev, CIO_GONE))
1346 return IO_SCH_UNREG_ATTACH;
1347 return IO_SCH_ORPH_ATTACH;
1349 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1350 if (!ccw_device_notify(cdev, CIO_NO_PATH))
1351 return IO_SCH_UNREG;
1354 if (device_is_disconnected(cdev))
1355 return IO_SCH_REPROBE;
1357 return IO_SCH_VERIFY;
1362 * io_subchannel_sch_event - process subchannel event
1364 * @process: non-zero if function is called in process context
1366 * An unspecified event occurred for this subchannel. Adjust data according
1367 * to the current operational state of the subchannel and device. Return
1368 * zero when the event has been handled sufficiently or -EAGAIN when this
1369 * function should be called again in process context.
1371 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1373 unsigned long flags;
1374 struct ccw_device *cdev;
1375 struct ccw_dev_id dev_id;
1376 enum io_sch_action action;
1379 spin_lock_irqsave(sch->lock, flags);
1380 if (!device_is_registered(&sch->dev))
1382 if (work_pending(&sch->todo_work))
1384 cdev = sch_get_cdev(sch);
1385 if (cdev && work_pending(&cdev->private->todo_work))
1387 action = sch_get_action(sch);
1388 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1389 sch->schid.ssid, sch->schid.sch_no, process,
1391 /* Perform immediate actions while holding the lock. */
1393 case IO_SCH_REPROBE:
1394 /* Trigger device recognition. */
1395 ccw_device_trigger_reprobe(cdev);
1399 /* Trigger path verification. */
1400 io_subchannel_verify(sch);
1404 ccw_device_set_disconnected(cdev);
1407 case IO_SCH_ORPH_UNREG:
1408 case IO_SCH_ORPH_ATTACH:
1409 ccw_device_set_disconnected(cdev);
1411 case IO_SCH_UNREG_ATTACH:
1414 ccw_device_set_notoper(cdev);
1422 spin_unlock_irqrestore(sch->lock, flags);
1423 /* All other actions require process context. */
1426 /* Handle attached ccw device. */
1428 case IO_SCH_ORPH_UNREG:
1429 case IO_SCH_ORPH_ATTACH:
1430 /* Move ccw device to orphanage. */
1431 rc = ccw_device_move_to_orph(cdev);
1435 case IO_SCH_UNREG_ATTACH:
1436 /* Unregister ccw device. */
1437 ccw_device_unregister(cdev);
1442 /* Handle subchannel. */
1444 case IO_SCH_ORPH_UNREG:
1446 css_sch_device_unregister(sch);
1448 case IO_SCH_ORPH_ATTACH:
1449 case IO_SCH_UNREG_ATTACH:
1451 dev_id.ssid = sch->schid.ssid;
1452 dev_id.devno = sch->schib.pmcw.dev;
1453 cdev = get_ccwdev_by_dev_id(&dev_id);
1455 sch_create_and_recog_new_device(sch);
1458 rc = ccw_device_move_to_sch(cdev, sch);
1460 /* Release reference from get_ccwdev_by_dev_id() */
1461 put_device(&cdev->dev);
1464 spin_lock_irqsave(sch->lock, flags);
1465 ccw_device_trigger_reprobe(cdev);
1466 spin_unlock_irqrestore(sch->lock, flags);
1467 /* Release reference from get_ccwdev_by_dev_id() */
1468 put_device(&cdev->dev);
1476 spin_unlock_irqrestore(sch->lock, flags);
1481 #ifdef CONFIG_CCW_CONSOLE
1482 static struct ccw_device console_cdev;
1483 static struct ccw_device_private console_private;
1484 static int console_cdev_in_use;
1486 static DEFINE_SPINLOCK(ccw_console_lock);
1488 spinlock_t * cio_get_console_lock(void)
1490 return &ccw_console_lock;
1493 static int ccw_device_console_enable(struct ccw_device *cdev,
1494 struct subchannel *sch)
1498 /* Attach subchannel private data. */
1499 sch->private = cio_get_console_priv();
1500 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1501 io_subchannel_init_fields(sch);
1502 rc = cio_commit_config(sch);
1505 sch->driver = &io_subchannel_driver;
1506 /* Initialize the ccw_device structure. */
1507 cdev->dev.parent= &sch->dev;
1508 io_subchannel_recog(cdev, sch);
1509 /* Now wait for the async. recognition to come to an end. */
1510 spin_lock_irq(cdev->ccwlock);
1511 while (!dev_fsm_final_state(cdev))
1514 if (cdev->private->state != DEV_STATE_OFFLINE)
1516 ccw_device_online(cdev);
1517 while (!dev_fsm_final_state(cdev))
1519 if (cdev->private->state != DEV_STATE_ONLINE)
1523 spin_unlock_irq(cdev->ccwlock);
1528 ccw_device_probe_console(void)
1530 struct subchannel *sch;
1533 if (xchg(&console_cdev_in_use, 1) != 0)
1534 return ERR_PTR(-EBUSY);
1535 sch = cio_probe_console();
1537 console_cdev_in_use = 0;
1538 return (void *) sch;
1540 memset(&console_cdev, 0, sizeof(struct ccw_device));
1541 memset(&console_private, 0, sizeof(struct ccw_device_private));
1542 console_cdev.private = &console_private;
1543 console_private.cdev = &console_cdev;
1544 ret = ccw_device_console_enable(&console_cdev, sch);
1546 cio_release_console();
1547 console_cdev_in_use = 0;
1548 return ERR_PTR(ret);
1550 console_cdev.online = 1;
1551 return &console_cdev;
1554 static int ccw_device_pm_restore(struct device *dev);
1556 int ccw_device_force_console(void)
1558 if (!console_cdev_in_use)
1560 return ccw_device_pm_restore(&console_cdev.dev);
1562 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1566 * get ccw_device matching the busid, but only if owned by cdrv
1569 __ccwdev_check_busid(struct device *dev, void *id)
1575 return (strcmp(bus_id, dev_name(dev)) == 0);
1580 * get_ccwdev_by_busid() - obtain device from a bus id
1581 * @cdrv: driver the device is owned by
1582 * @bus_id: bus id of the device to be searched
1584 * This function searches all devices owned by @cdrv for a device with a bus
1585 * id matching @bus_id.
1587 * If a match is found, its reference count of the found device is increased
1588 * and it is returned; else %NULL is returned.
1590 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1594 struct device_driver *drv;
1596 drv = get_driver(&cdrv->driver);
1600 dev = driver_find_device(drv, NULL, (void *)bus_id,
1601 __ccwdev_check_busid);
1604 return dev ? to_ccwdev(dev) : NULL;
1607 /************************** device driver handling ************************/
1609 /* This is the implementation of the ccw_driver class. The probe, remove
1610 * and release methods are initially very similar to the device_driver
1611 * implementations, with the difference that they have ccw_device
1614 * A ccw driver also contains the information that is needed for
1618 ccw_device_probe (struct device *dev)
1620 struct ccw_device *cdev = to_ccwdev(dev);
1621 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1624 cdev->drv = cdrv; /* to let the driver call _set_online */
1626 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1637 ccw_device_remove (struct device *dev)
1639 struct ccw_device *cdev = to_ccwdev(dev);
1640 struct ccw_driver *cdrv = cdev->drv;
1647 spin_lock_irq(cdev->ccwlock);
1648 ret = ccw_device_offline(cdev);
1649 spin_unlock_irq(cdev->ccwlock);
1651 wait_event(cdev->private->wait_q,
1652 dev_fsm_final_state(cdev));
1654 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1655 "device 0.%x.%04x\n",
1656 ret, cdev->private->dev_id.ssid,
1657 cdev->private->dev_id.devno);
1658 /* Give up reference obtained in ccw_device_set_online(). */
1659 put_device(&cdev->dev);
1661 ccw_device_set_timeout(cdev, 0);
1666 static void ccw_device_shutdown(struct device *dev)
1668 struct ccw_device *cdev;
1670 cdev = to_ccwdev(dev);
1671 if (cdev->drv && cdev->drv->shutdown)
1672 cdev->drv->shutdown(cdev);
1676 static int ccw_device_pm_prepare(struct device *dev)
1678 struct ccw_device *cdev = to_ccwdev(dev);
1680 if (work_pending(&cdev->private->todo_work))
1682 /* Fail while device is being set online/offline. */
1683 if (atomic_read(&cdev->private->onoff))
1686 if (cdev->online && cdev->drv && cdev->drv->prepare)
1687 return cdev->drv->prepare(cdev);
1692 static void ccw_device_pm_complete(struct device *dev)
1694 struct ccw_device *cdev = to_ccwdev(dev);
1696 if (cdev->online && cdev->drv && cdev->drv->complete)
1697 cdev->drv->complete(cdev);
1700 static int ccw_device_pm_freeze(struct device *dev)
1702 struct ccw_device *cdev = to_ccwdev(dev);
1703 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1704 int ret, cm_enabled;
1706 /* Fail suspend while device is in transistional state. */
1707 if (!dev_fsm_final_state(cdev))
1711 if (cdev->drv && cdev->drv->freeze) {
1712 ret = cdev->drv->freeze(cdev);
1717 spin_lock_irq(sch->lock);
1718 cm_enabled = cdev->private->cmb != NULL;
1719 spin_unlock_irq(sch->lock);
1721 /* Don't have the css write on memory. */
1722 ret = ccw_set_cmf(cdev, 0);
1726 /* From here on, disallow device driver I/O. */
1727 spin_lock_irq(sch->lock);
1728 ret = cio_disable_subchannel(sch);
1729 spin_unlock_irq(sch->lock);
1734 static int ccw_device_pm_thaw(struct device *dev)
1736 struct ccw_device *cdev = to_ccwdev(dev);
1737 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1738 int ret, cm_enabled;
1743 spin_lock_irq(sch->lock);
1744 /* Allow device driver I/O again. */
1745 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1746 cm_enabled = cdev->private->cmb != NULL;
1747 spin_unlock_irq(sch->lock);
1752 ret = ccw_set_cmf(cdev, 1);
1757 if (cdev->drv && cdev->drv->thaw)
1758 ret = cdev->drv->thaw(cdev);
1763 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1765 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1767 if (cio_is_console(sch->schid))
1770 * While we were sleeping, devices may have gone or become
1771 * available again. Kick re-detection.
1773 spin_lock_irq(sch->lock);
1774 cdev->private->flags.resuming = 1;
1775 ccw_device_recognition(cdev);
1776 spin_unlock_irq(sch->lock);
1777 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1778 cdev->private->state == DEV_STATE_DISCONNECTED);
1780 cdev->private->flags.resuming = 0;
1783 static int resume_handle_boxed(struct ccw_device *cdev)
1785 cdev->private->state = DEV_STATE_BOXED;
1786 if (ccw_device_notify(cdev, CIO_BOXED))
1788 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1792 static int resume_handle_disc(struct ccw_device *cdev)
1794 cdev->private->state = DEV_STATE_DISCONNECTED;
1795 if (ccw_device_notify(cdev, CIO_GONE))
1797 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1801 static int ccw_device_pm_restore(struct device *dev)
1803 struct ccw_device *cdev = to_ccwdev(dev);
1804 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1805 int ret = 0, cm_enabled;
1807 __ccw_device_pm_restore(cdev);
1808 spin_lock_irq(sch->lock);
1809 if (cio_is_console(sch->schid)) {
1810 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1811 spin_unlock_irq(sch->lock);
1814 cdev->private->flags.donotify = 0;
1815 /* check recognition results */
1816 switch (cdev->private->state) {
1817 case DEV_STATE_OFFLINE:
1819 case DEV_STATE_BOXED:
1820 ret = resume_handle_boxed(cdev);
1821 spin_unlock_irq(sch->lock);
1825 case DEV_STATE_DISCONNECTED:
1826 goto out_disc_unlock;
1828 goto out_unreg_unlock;
1830 /* check if the device id has changed */
1831 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1832 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1833 "changed from %04x to %04x)\n",
1834 sch->schid.ssid, sch->schid.sch_no,
1835 cdev->private->dev_id.devno,
1836 sch->schib.pmcw.dev);
1837 goto out_unreg_unlock;
1839 /* check if the device type has changed */
1840 if (!ccw_device_test_sense_data(cdev)) {
1841 ccw_device_update_sense_data(cdev);
1842 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1846 if (!cdev->online) {
1850 ret = ccw_device_online(cdev);
1852 goto out_disc_unlock;
1854 cm_enabled = cdev->private->cmb != NULL;
1855 spin_unlock_irq(sch->lock);
1857 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1858 if (cdev->private->state != DEV_STATE_ONLINE) {
1859 spin_lock_irq(sch->lock);
1860 goto out_disc_unlock;
1863 ret = ccw_set_cmf(cdev, 1);
1865 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1866 "(rc=%d)\n", cdev->private->dev_id.ssid,
1867 cdev->private->dev_id.devno, ret);
1873 if (cdev->online && cdev->drv && cdev->drv->restore)
1874 ret = cdev->drv->restore(cdev);
1879 ret = resume_handle_disc(cdev);
1880 spin_unlock_irq(sch->lock);
1886 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
1889 spin_unlock_irq(sch->lock);
1893 static struct dev_pm_ops ccw_pm_ops = {
1894 .prepare = ccw_device_pm_prepare,
1895 .complete = ccw_device_pm_complete,
1896 .freeze = ccw_device_pm_freeze,
1897 .thaw = ccw_device_pm_thaw,
1898 .restore = ccw_device_pm_restore,
1901 struct bus_type ccw_bus_type = {
1903 .match = ccw_bus_match,
1904 .uevent = ccw_uevent,
1905 .probe = ccw_device_probe,
1906 .remove = ccw_device_remove,
1907 .shutdown = ccw_device_shutdown,
1912 * ccw_driver_register() - register a ccw driver
1913 * @cdriver: driver to be registered
1915 * This function is mainly a wrapper around driver_register().
1917 * %0 on success and a negative error value on failure.
1919 int ccw_driver_register(struct ccw_driver *cdriver)
1921 struct device_driver *drv = &cdriver->driver;
1923 drv->bus = &ccw_bus_type;
1924 drv->name = cdriver->name;
1925 drv->owner = cdriver->owner;
1927 return driver_register(drv);
1931 * ccw_driver_unregister() - deregister a ccw driver
1932 * @cdriver: driver to be deregistered
1934 * This function is mainly a wrapper around driver_unregister().
1936 void ccw_driver_unregister(struct ccw_driver *cdriver)
1938 driver_unregister(&cdriver->driver);
1941 /* Helper func for qdio. */
1942 struct subchannel_id
1943 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1945 struct subchannel *sch;
1947 sch = to_subchannel(cdev->dev.parent);
1951 static void ccw_device_todo(struct work_struct *work)
1953 struct ccw_device_private *priv;
1954 struct ccw_device *cdev;
1955 struct subchannel *sch;
1956 enum cdev_todo todo;
1958 priv = container_of(work, struct ccw_device_private, todo_work);
1960 sch = to_subchannel(cdev->dev.parent);
1961 /* Find out todo. */
1962 spin_lock_irq(cdev->ccwlock);
1964 priv->todo = CDEV_TODO_NOTHING;
1965 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1966 priv->dev_id.ssid, priv->dev_id.devno, todo);
1967 spin_unlock_irq(cdev->ccwlock);
1970 case CDEV_TODO_ENABLE_CMF:
1973 case CDEV_TODO_REBIND:
1974 ccw_device_do_unbind_bind(cdev);
1976 case CDEV_TODO_REGISTER:
1977 io_subchannel_register(cdev);
1979 case CDEV_TODO_UNREG_EVAL:
1980 if (!sch_is_pseudo_sch(sch))
1981 css_schedule_eval(sch->schid);
1983 case CDEV_TODO_UNREG:
1984 if (sch_is_pseudo_sch(sch))
1985 ccw_device_unregister(cdev);
1987 ccw_device_call_sch_unregister(cdev);
1992 /* Release workqueue ref. */
1993 put_device(&cdev->dev);
1997 * ccw_device_sched_todo - schedule ccw device operation
2001 * Schedule the operation identified by @todo to be performed on the slow path
2002 * workqueue. Do nothing if another operation with higher priority is already
2003 * scheduled. Needs to be called with ccwdev lock held.
2005 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2007 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2008 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2010 if (cdev->private->todo >= todo)
2012 cdev->private->todo = todo;
2013 /* Get workqueue ref. */
2014 if (!get_device(&cdev->dev))
2016 if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
2017 /* Already queued, release workqueue ref. */
2018 put_device(&cdev->dev);
2022 MODULE_LICENSE("GPL");
2023 EXPORT_SYMBOL(ccw_device_set_online);
2024 EXPORT_SYMBOL(ccw_device_set_offline);
2025 EXPORT_SYMBOL(ccw_driver_register);
2026 EXPORT_SYMBOL(ccw_driver_unregister);
2027 EXPORT_SYMBOL(get_ccwdev_by_busid);
2028 EXPORT_SYMBOL(ccw_bus_type);
2029 EXPORT_SYMBOL(ccw_device_work);
2030 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);