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 /* Undo device_add(). */
308 device_del(&cdev->dev);
310 if (cdev->private->flags.initialized) {
311 cdev->private->flags.initialized = 0;
312 /* Release reference from device_initialize(). */
313 put_device(&cdev->dev);
317 static void io_subchannel_quiesce(struct subchannel *);
320 * ccw_device_set_offline() - disable a ccw device for I/O
321 * @cdev: target ccw device
323 * This function calls the driver's set_offline() function for @cdev, if
324 * given, and then disables @cdev.
326 * %0 on success and a negative error value on failure.
328 * enabled, ccw device lock not held
330 int ccw_device_set_offline(struct ccw_device *cdev)
332 struct subchannel *sch;
337 if (!cdev->online || !cdev->drv)
340 if (cdev->drv->set_offline) {
341 ret = cdev->drv->set_offline(cdev);
346 spin_lock_irq(cdev->ccwlock);
347 sch = to_subchannel(cdev->dev.parent);
348 /* Wait until a final state or DISCONNECTED is reached */
349 while (!dev_fsm_final_state(cdev) &&
350 cdev->private->state != DEV_STATE_DISCONNECTED) {
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 spin_lock_irq(cdev->ccwlock);
357 ret = ccw_device_offline(cdev);
360 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
361 "0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
362 cdev->private->dev_id.devno);
365 state = cdev->private->state;
366 spin_unlock_irq(cdev->ccwlock);
367 io_subchannel_quiesce(sch);
368 spin_lock_irq(cdev->ccwlock);
369 cdev->private->state = state;
370 } while (ret == -EBUSY);
371 spin_unlock_irq(cdev->ccwlock);
372 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
373 cdev->private->state == DEV_STATE_DISCONNECTED));
374 /* Inform the user if set offline failed. */
375 if (cdev->private->state == DEV_STATE_BOXED) {
376 pr_warning("%s: The device entered boxed state while "
377 "being set offline\n", dev_name(&cdev->dev));
378 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
379 pr_warning("%s: The device stopped operating while "
380 "being set offline\n", dev_name(&cdev->dev));
382 /* Give up reference from ccw_device_set_online(). */
383 put_device(&cdev->dev);
387 cdev->private->state = DEV_STATE_OFFLINE;
388 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
389 spin_unlock_irq(cdev->ccwlock);
390 /* Give up reference from ccw_device_set_online(). */
391 put_device(&cdev->dev);
396 * ccw_device_set_online() - enable a ccw device for I/O
397 * @cdev: target ccw device
399 * This function first enables @cdev and then calls the driver's set_online()
400 * function for @cdev, if given. If set_online() returns an error, @cdev is
403 * %0 on success and a negative error value on failure.
405 * enabled, ccw device lock not held
407 int ccw_device_set_online(struct ccw_device *cdev)
414 if (cdev->online || !cdev->drv)
416 /* Hold on to an extra reference while device is online. */
417 if (!get_device(&cdev->dev))
420 spin_lock_irq(cdev->ccwlock);
421 ret = ccw_device_online(cdev);
422 spin_unlock_irq(cdev->ccwlock);
424 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
426 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
427 "device 0.%x.%04x\n",
428 ret, cdev->private->dev_id.ssid,
429 cdev->private->dev_id.devno);
430 /* Give up online reference since onlining failed. */
431 put_device(&cdev->dev);
434 spin_lock_irq(cdev->ccwlock);
435 /* Check if online processing was successful */
436 if ((cdev->private->state != DEV_STATE_ONLINE) &&
437 (cdev->private->state != DEV_STATE_W4SENSE)) {
438 spin_unlock_irq(cdev->ccwlock);
439 /* Inform the user that set online failed. */
440 if (cdev->private->state == DEV_STATE_BOXED) {
441 pr_warning("%s: Setting the device online failed "
442 "because it is boxed\n",
443 dev_name(&cdev->dev));
444 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
445 pr_warning("%s: Setting the device online failed "
446 "because it is not operational\n",
447 dev_name(&cdev->dev));
449 /* Give up online reference since onlining failed. */
450 put_device(&cdev->dev);
453 spin_unlock_irq(cdev->ccwlock);
454 if (cdev->drv->set_online)
455 ret = cdev->drv->set_online(cdev);
462 spin_lock_irq(cdev->ccwlock);
463 /* Wait until a final state or DISCONNECTED is reached */
464 while (!dev_fsm_final_state(cdev) &&
465 cdev->private->state != DEV_STATE_DISCONNECTED) {
466 spin_unlock_irq(cdev->ccwlock);
467 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
468 cdev->private->state == DEV_STATE_DISCONNECTED));
469 spin_lock_irq(cdev->ccwlock);
471 ret2 = ccw_device_offline(cdev);
474 spin_unlock_irq(cdev->ccwlock);
475 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
476 cdev->private->state == DEV_STATE_DISCONNECTED));
477 /* Give up online reference since onlining failed. */
478 put_device(&cdev->dev);
482 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
483 "device 0.%x.%04x\n",
484 ret2, cdev->private->dev_id.ssid,
485 cdev->private->dev_id.devno);
486 cdev->private->state = DEV_STATE_OFFLINE;
487 spin_unlock_irq(cdev->ccwlock);
488 /* Give up online reference since onlining failed. */
489 put_device(&cdev->dev);
493 static int online_store_handle_offline(struct ccw_device *cdev)
495 if (cdev->private->state == DEV_STATE_DISCONNECTED) {
496 spin_lock_irq(cdev->ccwlock);
497 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
498 spin_unlock_irq(cdev->ccwlock);
499 } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
500 return ccw_device_set_offline(cdev);
504 static int online_store_recog_and_online(struct ccw_device *cdev)
506 /* Do device recognition, if needed. */
507 if (cdev->private->state == DEV_STATE_BOXED) {
508 spin_lock_irq(cdev->ccwlock);
509 ccw_device_recognition(cdev);
510 spin_unlock_irq(cdev->ccwlock);
511 wait_event(cdev->private->wait_q,
512 cdev->private->flags.recog_done);
513 if (cdev->private->state != DEV_STATE_OFFLINE)
514 /* recognition failed */
517 if (cdev->drv && cdev->drv->set_online)
518 ccw_device_set_online(cdev);
522 static int online_store_handle_online(struct ccw_device *cdev, int force)
526 ret = online_store_recog_and_online(cdev);
529 if (force && cdev->private->state == DEV_STATE_BOXED) {
530 ret = ccw_device_stlck(cdev);
533 if (cdev->id.cu_type == 0)
534 cdev->private->state = DEV_STATE_NOT_OPER;
535 ret = online_store_recog_and_online(cdev);
542 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
543 const char *buf, size_t count)
545 struct ccw_device *cdev = to_ccwdev(dev);
549 if (!dev_fsm_final_state(cdev) &&
550 cdev->private->state != DEV_STATE_DISCONNECTED)
552 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
555 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
556 atomic_set(&cdev->private->onoff, 0);
559 if (!strncmp(buf, "force\n", count)) {
565 ret = strict_strtoul(buf, 16, &i);
571 ret = online_store_handle_offline(cdev);
574 ret = online_store_handle_online(cdev, force);
581 module_put(cdev->drv->owner);
582 atomic_set(&cdev->private->onoff, 0);
583 return (ret < 0) ? ret : count;
587 available_show (struct device *dev, struct device_attribute *attr, char *buf)
589 struct ccw_device *cdev = to_ccwdev(dev);
590 struct subchannel *sch;
592 if (ccw_device_is_orphan(cdev))
593 return sprintf(buf, "no device\n");
594 switch (cdev->private->state) {
595 case DEV_STATE_BOXED:
596 return sprintf(buf, "boxed\n");
597 case DEV_STATE_DISCONNECTED:
598 case DEV_STATE_DISCONNECTED_SENSE_ID:
599 case DEV_STATE_NOT_OPER:
600 sch = to_subchannel(dev->parent);
602 return sprintf(buf, "no path\n");
604 return sprintf(buf, "no device\n");
606 /* All other states considered fine. */
607 return sprintf(buf, "good\n");
611 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
612 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
613 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
614 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
615 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
616 static DEVICE_ATTR(online, 0644, online_show, online_store);
617 static DEVICE_ATTR(availability, 0444, available_show, NULL);
619 static struct attribute *io_subchannel_attrs[] = {
620 &dev_attr_chpids.attr,
621 &dev_attr_pimpampom.attr,
625 static struct attribute_group io_subchannel_attr_group = {
626 .attrs = io_subchannel_attrs,
629 static struct attribute * ccwdev_attrs[] = {
630 &dev_attr_devtype.attr,
631 &dev_attr_cutype.attr,
632 &dev_attr_modalias.attr,
633 &dev_attr_online.attr,
634 &dev_attr_cmb_enable.attr,
635 &dev_attr_availability.attr,
639 static struct attribute_group ccwdev_attr_group = {
640 .attrs = ccwdev_attrs,
643 static const struct attribute_group *ccwdev_attr_groups[] = {
648 /* this is a simple abstraction for device_register that sets the
649 * correct bus type and adds the bus specific files */
650 static int ccw_device_register(struct ccw_device *cdev)
652 struct device *dev = &cdev->dev;
655 dev->bus = &ccw_bus_type;
656 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
657 cdev->private->dev_id.devno);
660 return device_add(dev);
663 static int match_dev_id(struct device *dev, void *data)
665 struct ccw_device *cdev = to_ccwdev(dev);
666 struct ccw_dev_id *dev_id = data;
668 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
671 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
675 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
677 return dev ? to_ccwdev(dev) : NULL;
680 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
684 if (device_is_registered(&cdev->dev)) {
685 device_release_driver(&cdev->dev);
686 ret = device_attach(&cdev->dev);
687 WARN_ON(ret == -ENODEV);
692 ccw_device_release(struct device *dev)
694 struct ccw_device *cdev;
696 cdev = to_ccwdev(dev);
697 /* Release reference of parent subchannel. */
698 put_device(cdev->dev.parent);
699 kfree(cdev->private);
703 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
705 struct ccw_device *cdev;
707 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
709 cdev->private = kzalloc(sizeof(struct ccw_device_private),
710 GFP_KERNEL | GFP_DMA);
715 return ERR_PTR(-ENOMEM);
718 static void ccw_device_todo(struct work_struct *work);
720 static int io_subchannel_initialize_dev(struct subchannel *sch,
721 struct ccw_device *cdev)
723 cdev->private->cdev = cdev;
724 atomic_set(&cdev->private->onoff, 0);
725 cdev->dev.parent = &sch->dev;
726 cdev->dev.release = ccw_device_release;
727 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
728 cdev->dev.groups = ccwdev_attr_groups;
729 /* Do first half of device_register. */
730 device_initialize(&cdev->dev);
731 if (!get_device(&sch->dev)) {
732 /* Release reference from device_initialize(). */
733 put_device(&cdev->dev);
736 cdev->private->flags.initialized = 1;
740 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
742 struct ccw_device *cdev;
745 cdev = io_subchannel_allocate_dev(sch);
747 ret = io_subchannel_initialize_dev(sch, cdev);
754 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
756 static void sch_create_and_recog_new_device(struct subchannel *sch)
758 struct ccw_device *cdev;
760 /* Need to allocate a new ccw device. */
761 cdev = io_subchannel_create_ccwdev(sch);
763 /* OK, we did everything we could... */
764 css_sch_device_unregister(sch);
767 /* Start recognition for the new ccw device. */
768 io_subchannel_recog(cdev, sch);
772 * Register recognized device.
774 static void io_subchannel_register(struct ccw_device *cdev)
776 struct subchannel *sch;
780 sch = to_subchannel(cdev->dev.parent);
782 * Check if subchannel is still registered. It may have become
783 * unregistered if a machine check hit us after finishing
784 * device recognition but before the register work could be
787 if (!device_is_registered(&sch->dev))
789 css_update_ssd_info(sch);
791 * io_subchannel_register() will also be called after device
792 * recognition has been done for a boxed device (which will already
793 * be registered). We need to reprobe since we may now have sense id
796 if (device_is_registered(&cdev->dev)) {
798 ret = device_reprobe(&cdev->dev);
800 /* We can't do much here. */
801 CIO_MSG_EVENT(0, "device_reprobe() returned"
802 " %d for 0.%x.%04x\n", ret,
803 cdev->private->dev_id.ssid,
804 cdev->private->dev_id.devno);
809 * Now we know this subchannel will stay, we can throw
810 * our delayed uevent.
812 dev_set_uevent_suppress(&sch->dev, 0);
813 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
814 /* make it known to the system */
815 ret = ccw_device_register(cdev);
817 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
818 cdev->private->dev_id.ssid,
819 cdev->private->dev_id.devno, ret);
820 spin_lock_irqsave(sch->lock, flags);
821 sch_set_cdev(sch, NULL);
822 spin_unlock_irqrestore(sch->lock, flags);
823 /* Release initial device reference. */
824 put_device(&cdev->dev);
828 cdev->private->flags.recog_done = 1;
829 wake_up(&cdev->private->wait_q);
831 if (atomic_dec_and_test(&ccw_device_init_count))
832 wake_up(&ccw_device_init_wq);
835 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
837 struct subchannel *sch;
839 /* Get subchannel reference for local processing. */
840 if (!get_device(cdev->dev.parent))
842 sch = to_subchannel(cdev->dev.parent);
843 css_sch_device_unregister(sch);
844 /* Release subchannel reference for local processing. */
845 put_device(&sch->dev);
849 * subchannel recognition done. Called from the state machine.
852 io_subchannel_recog_done(struct ccw_device *cdev)
854 if (css_init_done == 0) {
855 cdev->private->flags.recog_done = 1;
858 switch (cdev->private->state) {
859 case DEV_STATE_BOXED:
860 /* Device did not respond in time. */
861 case DEV_STATE_NOT_OPER:
862 cdev->private->flags.recog_done = 1;
863 /* Remove device found not operational. */
864 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
865 if (atomic_dec_and_test(&ccw_device_init_count))
866 wake_up(&ccw_device_init_wq);
868 case DEV_STATE_OFFLINE:
870 * We can't register the device in interrupt context so
871 * we schedule a work item.
873 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
878 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
880 struct ccw_device_private *priv;
882 cdev->ccwlock = sch->lock;
884 /* Init private data. */
885 priv = cdev->private;
886 priv->dev_id.devno = sch->schib.pmcw.dev;
887 priv->dev_id.ssid = sch->schid.ssid;
888 priv->schid = sch->schid;
889 priv->state = DEV_STATE_NOT_OPER;
890 INIT_LIST_HEAD(&priv->cmb_list);
891 init_waitqueue_head(&priv->wait_q);
892 init_timer(&priv->timer);
894 /* Increase counter of devices currently in recognition. */
895 atomic_inc(&ccw_device_init_count);
897 /* Start async. device sensing. */
898 spin_lock_irq(sch->lock);
899 sch_set_cdev(sch, cdev);
900 ccw_device_recognition(cdev);
901 spin_unlock_irq(sch->lock);
904 static int ccw_device_move_to_sch(struct ccw_device *cdev,
905 struct subchannel *sch)
907 struct subchannel *old_sch;
908 int rc, old_enabled = 0;
910 old_sch = to_subchannel(cdev->dev.parent);
911 /* Obtain child reference for new parent. */
912 if (!get_device(&sch->dev))
915 if (!sch_is_pseudo_sch(old_sch)) {
916 spin_lock_irq(old_sch->lock);
917 old_enabled = old_sch->schib.pmcw.ena;
920 rc = cio_disable_subchannel(old_sch);
921 spin_unlock_irq(old_sch->lock);
923 /* Release child reference for new parent. */
924 put_device(&sch->dev);
929 mutex_lock(&sch->reg_mutex);
930 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
931 mutex_unlock(&sch->reg_mutex);
933 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
934 cdev->private->dev_id.ssid,
935 cdev->private->dev_id.devno, sch->schid.ssid,
936 sch->schib.pmcw.dev, rc);
938 /* Try to reenable the old subchannel. */
939 spin_lock_irq(old_sch->lock);
940 cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
941 spin_unlock_irq(old_sch->lock);
943 /* Release child reference for new parent. */
944 put_device(&sch->dev);
947 /* Clean up old subchannel. */
948 if (!sch_is_pseudo_sch(old_sch)) {
949 spin_lock_irq(old_sch->lock);
950 sch_set_cdev(old_sch, NULL);
951 spin_unlock_irq(old_sch->lock);
952 css_schedule_eval(old_sch->schid);
954 /* Release child reference for old parent. */
955 put_device(&old_sch->dev);
956 /* Initialize new subchannel. */
957 spin_lock_irq(sch->lock);
958 cdev->private->schid = sch->schid;
959 cdev->ccwlock = sch->lock;
960 if (!sch_is_pseudo_sch(sch))
961 sch_set_cdev(sch, cdev);
962 spin_unlock_irq(sch->lock);
963 if (!sch_is_pseudo_sch(sch))
964 css_update_ssd_info(sch);
968 static int ccw_device_move_to_orph(struct ccw_device *cdev)
970 struct subchannel *sch = to_subchannel(cdev->dev.parent);
971 struct channel_subsystem *css = to_css(sch->dev.parent);
973 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
976 static void io_subchannel_irq(struct subchannel *sch)
978 struct ccw_device *cdev;
980 cdev = sch_get_cdev(sch);
982 CIO_TRACE_EVENT(6, "IRQ");
983 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
985 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
988 void io_subchannel_init_config(struct subchannel *sch)
990 memset(&sch->config, 0, sizeof(sch->config));
991 sch->config.csense = 1;
994 static void io_subchannel_init_fields(struct subchannel *sch)
996 if (cio_is_console(sch->schid))
999 sch->opm = chp_get_sch_opm(sch);
1000 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1001 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1003 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1004 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1005 sch->schib.pmcw.dev, sch->schid.ssid,
1006 sch->schid.sch_no, sch->schib.pmcw.pim,
1007 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1009 io_subchannel_init_config(sch);
1013 * Note: We always return 0 so that we bind to the device even on error.
1014 * This is needed so that our remove function is called on unregister.
1016 static int io_subchannel_probe(struct subchannel *sch)
1018 struct ccw_device *cdev;
1021 if (cio_is_console(sch->schid)) {
1022 rc = sysfs_create_group(&sch->dev.kobj,
1023 &io_subchannel_attr_group);
1025 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1026 "attributes for subchannel "
1027 "0.%x.%04x (rc=%d)\n",
1028 sch->schid.ssid, sch->schid.sch_no, rc);
1030 * The console subchannel already has an associated ccw_device.
1031 * Throw the delayed uevent for the subchannel, register
1032 * the ccw_device and exit.
1034 dev_set_uevent_suppress(&sch->dev, 0);
1035 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1036 cdev = sch_get_cdev(sch);
1037 cdev->dev.groups = ccwdev_attr_groups;
1038 device_initialize(&cdev->dev);
1039 cdev->private->flags.initialized = 1;
1040 ccw_device_register(cdev);
1042 * Check if the device is already online. If it is
1043 * the reference count needs to be corrected since we
1044 * didn't obtain a reference in ccw_device_set_online.
1046 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1047 cdev->private->state != DEV_STATE_OFFLINE &&
1048 cdev->private->state != DEV_STATE_BOXED)
1049 get_device(&cdev->dev);
1052 io_subchannel_init_fields(sch);
1053 rc = cio_commit_config(sch);
1056 rc = sysfs_create_group(&sch->dev.kobj,
1057 &io_subchannel_attr_group);
1060 /* Allocate I/O subchannel private data. */
1061 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1062 GFP_KERNEL | GFP_DMA);
1065 css_schedule_eval(sch->schid);
1069 spin_lock_irq(sch->lock);
1070 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1071 spin_unlock_irq(sch->lock);
1076 io_subchannel_remove (struct subchannel *sch)
1078 struct ccw_device *cdev;
1080 cdev = sch_get_cdev(sch);
1083 io_subchannel_quiesce(sch);
1084 /* Set ccw device to not operational and drop reference. */
1085 spin_lock_irq(cdev->ccwlock);
1086 sch_set_cdev(sch, NULL);
1087 cdev->private->state = DEV_STATE_NOT_OPER;
1088 spin_unlock_irq(cdev->ccwlock);
1089 ccw_device_unregister(cdev);
1091 kfree(sch->private);
1092 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1096 static void io_subchannel_verify(struct subchannel *sch)
1098 struct ccw_device *cdev;
1100 cdev = sch_get_cdev(sch);
1102 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
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 (cio_update_schib(sch))
1114 /* Check for I/O on path. */
1115 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1117 if (cdev->private->state == DEV_STATE_ONLINE) {
1118 ccw_device_kill_io(cdev);
1124 /* Trigger path verification. */
1125 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1129 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1132 static int io_subchannel_chp_event(struct subchannel *sch,
1133 struct chp_link *link, int event)
1137 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1144 io_subchannel_terminate_path(sch, mask);
1149 io_subchannel_verify(sch);
1152 if (cio_update_schib(sch))
1154 io_subchannel_terminate_path(sch, mask);
1157 if (cio_update_schib(sch))
1159 sch->lpm |= mask & sch->opm;
1160 io_subchannel_verify(sch);
1166 static void io_subchannel_quiesce(struct subchannel *sch)
1168 struct ccw_device *cdev;
1171 spin_lock_irq(sch->lock);
1172 cdev = sch_get_cdev(sch);
1173 if (cio_is_console(sch->schid))
1175 if (!sch->schib.pmcw.ena)
1177 ret = cio_disable_subchannel(sch);
1181 cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
1182 while (ret == -EBUSY) {
1183 cdev->private->state = DEV_STATE_QUIESCE;
1184 ret = ccw_device_cancel_halt_clear(cdev);
1185 if (ret == -EBUSY) {
1186 ccw_device_set_timeout(cdev, HZ/10);
1187 spin_unlock_irq(sch->lock);
1188 wait_event(cdev->private->wait_q,
1189 cdev->private->state != DEV_STATE_QUIESCE);
1190 spin_lock_irq(sch->lock);
1192 ret = cio_disable_subchannel(sch);
1195 spin_unlock_irq(sch->lock);
1198 static void io_subchannel_shutdown(struct subchannel *sch)
1200 io_subchannel_quiesce(sch);
1203 static int device_is_disconnected(struct ccw_device *cdev)
1207 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1208 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1211 static int recovery_check(struct device *dev, void *data)
1213 struct ccw_device *cdev = to_ccwdev(dev);
1216 spin_lock_irq(cdev->ccwlock);
1217 switch (cdev->private->state) {
1218 case DEV_STATE_DISCONNECTED:
1219 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1220 cdev->private->dev_id.ssid,
1221 cdev->private->dev_id.devno);
1222 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1225 case DEV_STATE_DISCONNECTED_SENSE_ID:
1229 spin_unlock_irq(cdev->ccwlock);
1234 static void recovery_work_func(struct work_struct *unused)
1238 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1240 spin_lock_irq(&recovery_lock);
1241 if (!timer_pending(&recovery_timer)) {
1242 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1244 mod_timer(&recovery_timer, jiffies +
1245 recovery_delay[recovery_phase] * HZ);
1247 spin_unlock_irq(&recovery_lock);
1249 CIO_MSG_EVENT(4, "recovery: end\n");
1252 static DECLARE_WORK(recovery_work, recovery_work_func);
1254 static void recovery_func(unsigned long data)
1257 * We can't do our recovery in softirq context and it's not
1258 * performance critical, so we schedule it.
1260 schedule_work(&recovery_work);
1263 static void ccw_device_schedule_recovery(void)
1265 unsigned long flags;
1267 CIO_MSG_EVENT(4, "recovery: schedule\n");
1268 spin_lock_irqsave(&recovery_lock, flags);
1269 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1271 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1273 spin_unlock_irqrestore(&recovery_lock, flags);
1276 static int purge_fn(struct device *dev, void *data)
1278 struct ccw_device *cdev = to_ccwdev(dev);
1279 struct ccw_dev_id *id = &cdev->private->dev_id;
1281 spin_lock_irq(cdev->ccwlock);
1282 if (is_blacklisted(id->ssid, id->devno) &&
1283 (cdev->private->state == DEV_STATE_OFFLINE)) {
1284 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1286 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1288 spin_unlock_irq(cdev->ccwlock);
1289 /* Abort loop in case of pending signal. */
1290 if (signal_pending(current))
1297 * ccw_purge_blacklisted - purge unused, blacklisted devices
1299 * Unregister all ccw devices that are offline and on the blacklist.
1301 int ccw_purge_blacklisted(void)
1303 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1304 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1308 void ccw_device_set_disconnected(struct ccw_device *cdev)
1312 ccw_device_set_timeout(cdev, 0);
1313 cdev->private->flags.fake_irb = 0;
1314 cdev->private->state = DEV_STATE_DISCONNECTED;
1316 ccw_device_schedule_recovery();
1319 void ccw_device_set_notoper(struct ccw_device *cdev)
1321 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1323 CIO_TRACE_EVENT(2, "notoper");
1324 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1325 ccw_device_set_timeout(cdev, 0);
1326 cio_disable_subchannel(sch);
1327 cdev->private->state = DEV_STATE_NOT_OPER;
1330 enum io_sch_action {
1334 IO_SCH_UNREG_ATTACH,
1342 static enum io_sch_action sch_get_action(struct subchannel *sch)
1344 struct ccw_device *cdev;
1346 cdev = sch_get_cdev(sch);
1347 if (cio_update_schib(sch)) {
1348 /* Not operational. */
1350 return IO_SCH_UNREG;
1351 if (!ccw_device_notify(cdev, CIO_GONE))
1352 return IO_SCH_UNREG;
1353 return IO_SCH_ORPH_UNREG;
1357 return IO_SCH_ATTACH;
1358 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1359 if (!ccw_device_notify(cdev, CIO_GONE))
1360 return IO_SCH_UNREG_ATTACH;
1361 return IO_SCH_ORPH_ATTACH;
1363 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1364 if (!ccw_device_notify(cdev, CIO_NO_PATH))
1365 return IO_SCH_UNREG;
1368 if (device_is_disconnected(cdev))
1369 return IO_SCH_REPROBE;
1371 return IO_SCH_VERIFY;
1376 * io_subchannel_sch_event - process subchannel event
1378 * @process: non-zero if function is called in process context
1380 * An unspecified event occurred for this subchannel. Adjust data according
1381 * to the current operational state of the subchannel and device. Return
1382 * zero when the event has been handled sufficiently or -EAGAIN when this
1383 * function should be called again in process context.
1385 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1387 unsigned long flags;
1388 struct ccw_device *cdev;
1389 struct ccw_dev_id dev_id;
1390 enum io_sch_action action;
1393 spin_lock_irqsave(sch->lock, flags);
1394 if (!device_is_registered(&sch->dev))
1396 if (work_pending(&sch->todo_work))
1398 cdev = sch_get_cdev(sch);
1399 if (cdev && work_pending(&cdev->private->todo_work))
1401 action = sch_get_action(sch);
1402 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1403 sch->schid.ssid, sch->schid.sch_no, process,
1405 /* Perform immediate actions while holding the lock. */
1407 case IO_SCH_REPROBE:
1408 /* Trigger device recognition. */
1409 ccw_device_trigger_reprobe(cdev);
1413 /* Trigger path verification. */
1414 io_subchannel_verify(sch);
1418 ccw_device_set_disconnected(cdev);
1421 case IO_SCH_ORPH_UNREG:
1422 case IO_SCH_ORPH_ATTACH:
1423 ccw_device_set_disconnected(cdev);
1425 case IO_SCH_UNREG_ATTACH:
1428 ccw_device_set_notoper(cdev);
1436 spin_unlock_irqrestore(sch->lock, flags);
1437 /* All other actions require process context. */
1440 /* Handle attached ccw device. */
1442 case IO_SCH_ORPH_UNREG:
1443 case IO_SCH_ORPH_ATTACH:
1444 /* Move ccw device to orphanage. */
1445 rc = ccw_device_move_to_orph(cdev);
1449 case IO_SCH_UNREG_ATTACH:
1450 /* Unregister ccw device. */
1451 ccw_device_unregister(cdev);
1456 /* Handle subchannel. */
1458 case IO_SCH_ORPH_UNREG:
1460 css_sch_device_unregister(sch);
1462 case IO_SCH_ORPH_ATTACH:
1463 case IO_SCH_UNREG_ATTACH:
1465 dev_id.ssid = sch->schid.ssid;
1466 dev_id.devno = sch->schib.pmcw.dev;
1467 cdev = get_ccwdev_by_dev_id(&dev_id);
1469 sch_create_and_recog_new_device(sch);
1472 rc = ccw_device_move_to_sch(cdev, sch);
1474 /* Release reference from get_ccwdev_by_dev_id() */
1475 put_device(&cdev->dev);
1478 spin_lock_irqsave(sch->lock, flags);
1479 ccw_device_trigger_reprobe(cdev);
1480 spin_unlock_irqrestore(sch->lock, flags);
1481 /* Release reference from get_ccwdev_by_dev_id() */
1482 put_device(&cdev->dev);
1490 spin_unlock_irqrestore(sch->lock, flags);
1495 #ifdef CONFIG_CCW_CONSOLE
1496 static struct ccw_device console_cdev;
1497 static struct ccw_device_private console_private;
1498 static int console_cdev_in_use;
1500 static DEFINE_SPINLOCK(ccw_console_lock);
1502 spinlock_t * cio_get_console_lock(void)
1504 return &ccw_console_lock;
1507 static int ccw_device_console_enable(struct ccw_device *cdev,
1508 struct subchannel *sch)
1512 /* Attach subchannel private data. */
1513 sch->private = cio_get_console_priv();
1514 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1515 io_subchannel_init_fields(sch);
1516 rc = cio_commit_config(sch);
1519 sch->driver = &io_subchannel_driver;
1520 /* Initialize the ccw_device structure. */
1521 cdev->dev.parent= &sch->dev;
1522 sch_set_cdev(sch, cdev);
1523 io_subchannel_recog(cdev, sch);
1524 /* Now wait for the async. recognition to come to an end. */
1525 spin_lock_irq(cdev->ccwlock);
1526 while (!dev_fsm_final_state(cdev))
1529 if (cdev->private->state != DEV_STATE_OFFLINE)
1531 ccw_device_online(cdev);
1532 while (!dev_fsm_final_state(cdev))
1534 if (cdev->private->state != DEV_STATE_ONLINE)
1538 spin_unlock_irq(cdev->ccwlock);
1543 ccw_device_probe_console(void)
1545 struct subchannel *sch;
1548 if (xchg(&console_cdev_in_use, 1) != 0)
1549 return ERR_PTR(-EBUSY);
1550 sch = cio_probe_console();
1552 console_cdev_in_use = 0;
1553 return (void *) sch;
1555 memset(&console_cdev, 0, sizeof(struct ccw_device));
1556 memset(&console_private, 0, sizeof(struct ccw_device_private));
1557 console_cdev.private = &console_private;
1558 console_private.cdev = &console_cdev;
1559 ret = ccw_device_console_enable(&console_cdev, sch);
1561 cio_release_console();
1562 console_cdev_in_use = 0;
1563 return ERR_PTR(ret);
1565 console_cdev.online = 1;
1566 return &console_cdev;
1569 static int ccw_device_pm_restore(struct device *dev);
1571 int ccw_device_force_console(void)
1573 if (!console_cdev_in_use)
1575 return ccw_device_pm_restore(&console_cdev.dev);
1577 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1581 * get ccw_device matching the busid, but only if owned by cdrv
1584 __ccwdev_check_busid(struct device *dev, void *id)
1590 return (strcmp(bus_id, dev_name(dev)) == 0);
1595 * get_ccwdev_by_busid() - obtain device from a bus id
1596 * @cdrv: driver the device is owned by
1597 * @bus_id: bus id of the device to be searched
1599 * This function searches all devices owned by @cdrv for a device with a bus
1600 * id matching @bus_id.
1602 * If a match is found, its reference count of the found device is increased
1603 * and it is returned; else %NULL is returned.
1605 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1609 struct device_driver *drv;
1611 drv = get_driver(&cdrv->driver);
1615 dev = driver_find_device(drv, NULL, (void *)bus_id,
1616 __ccwdev_check_busid);
1619 return dev ? to_ccwdev(dev) : NULL;
1622 /************************** device driver handling ************************/
1624 /* This is the implementation of the ccw_driver class. The probe, remove
1625 * and release methods are initially very similar to the device_driver
1626 * implementations, with the difference that they have ccw_device
1629 * A ccw driver also contains the information that is needed for
1633 ccw_device_probe (struct device *dev)
1635 struct ccw_device *cdev = to_ccwdev(dev);
1636 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1639 cdev->drv = cdrv; /* to let the driver call _set_online */
1641 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1652 ccw_device_remove (struct device *dev)
1654 struct ccw_device *cdev = to_ccwdev(dev);
1655 struct ccw_driver *cdrv = cdev->drv;
1662 spin_lock_irq(cdev->ccwlock);
1663 ret = ccw_device_offline(cdev);
1664 spin_unlock_irq(cdev->ccwlock);
1666 wait_event(cdev->private->wait_q,
1667 dev_fsm_final_state(cdev));
1669 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1670 "device 0.%x.%04x\n",
1671 ret, cdev->private->dev_id.ssid,
1672 cdev->private->dev_id.devno);
1673 /* Give up reference obtained in ccw_device_set_online(). */
1674 put_device(&cdev->dev);
1676 ccw_device_set_timeout(cdev, 0);
1681 static void ccw_device_shutdown(struct device *dev)
1683 struct ccw_device *cdev;
1685 cdev = to_ccwdev(dev);
1686 if (cdev->drv && cdev->drv->shutdown)
1687 cdev->drv->shutdown(cdev);
1691 static int ccw_device_pm_prepare(struct device *dev)
1693 struct ccw_device *cdev = to_ccwdev(dev);
1695 if (work_pending(&cdev->private->todo_work))
1697 /* Fail while device is being set online/offline. */
1698 if (atomic_read(&cdev->private->onoff))
1701 if (cdev->online && cdev->drv && cdev->drv->prepare)
1702 return cdev->drv->prepare(cdev);
1707 static void ccw_device_pm_complete(struct device *dev)
1709 struct ccw_device *cdev = to_ccwdev(dev);
1711 if (cdev->online && cdev->drv && cdev->drv->complete)
1712 cdev->drv->complete(cdev);
1715 static int ccw_device_pm_freeze(struct device *dev)
1717 struct ccw_device *cdev = to_ccwdev(dev);
1718 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1719 int ret, cm_enabled;
1721 /* Fail suspend while device is in transistional state. */
1722 if (!dev_fsm_final_state(cdev))
1726 if (cdev->drv && cdev->drv->freeze) {
1727 ret = cdev->drv->freeze(cdev);
1732 spin_lock_irq(sch->lock);
1733 cm_enabled = cdev->private->cmb != NULL;
1734 spin_unlock_irq(sch->lock);
1736 /* Don't have the css write on memory. */
1737 ret = ccw_set_cmf(cdev, 0);
1741 /* From here on, disallow device driver I/O. */
1742 spin_lock_irq(sch->lock);
1743 ret = cio_disable_subchannel(sch);
1744 spin_unlock_irq(sch->lock);
1749 static int ccw_device_pm_thaw(struct device *dev)
1751 struct ccw_device *cdev = to_ccwdev(dev);
1752 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1753 int ret, cm_enabled;
1758 spin_lock_irq(sch->lock);
1759 /* Allow device driver I/O again. */
1760 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1761 cm_enabled = cdev->private->cmb != NULL;
1762 spin_unlock_irq(sch->lock);
1767 ret = ccw_set_cmf(cdev, 1);
1772 if (cdev->drv && cdev->drv->thaw)
1773 ret = cdev->drv->thaw(cdev);
1778 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1780 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1782 if (cio_is_console(sch->schid))
1785 * While we were sleeping, devices may have gone or become
1786 * available again. Kick re-detection.
1788 spin_lock_irq(sch->lock);
1789 cdev->private->flags.resuming = 1;
1790 ccw_device_recognition(cdev);
1791 spin_unlock_irq(sch->lock);
1792 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1793 cdev->private->state == DEV_STATE_DISCONNECTED);
1795 cdev->private->flags.resuming = 0;
1798 static int resume_handle_boxed(struct ccw_device *cdev)
1800 cdev->private->state = DEV_STATE_BOXED;
1801 if (ccw_device_notify(cdev, CIO_BOXED))
1803 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1807 static int resume_handle_disc(struct ccw_device *cdev)
1809 cdev->private->state = DEV_STATE_DISCONNECTED;
1810 if (ccw_device_notify(cdev, CIO_GONE))
1812 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1816 static int ccw_device_pm_restore(struct device *dev)
1818 struct ccw_device *cdev = to_ccwdev(dev);
1819 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1820 int ret = 0, cm_enabled;
1822 __ccw_device_pm_restore(cdev);
1823 spin_lock_irq(sch->lock);
1824 if (cio_is_console(sch->schid)) {
1825 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1826 spin_unlock_irq(sch->lock);
1829 cdev->private->flags.donotify = 0;
1830 /* check recognition results */
1831 switch (cdev->private->state) {
1832 case DEV_STATE_OFFLINE:
1834 case DEV_STATE_BOXED:
1835 ret = resume_handle_boxed(cdev);
1836 spin_unlock_irq(sch->lock);
1840 case DEV_STATE_DISCONNECTED:
1841 goto out_disc_unlock;
1843 goto out_unreg_unlock;
1845 /* check if the device id has changed */
1846 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1847 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1848 "changed from %04x to %04x)\n",
1849 sch->schid.ssid, sch->schid.sch_no,
1850 cdev->private->dev_id.devno,
1851 sch->schib.pmcw.dev);
1852 goto out_unreg_unlock;
1854 /* check if the device type has changed */
1855 if (!ccw_device_test_sense_data(cdev)) {
1856 ccw_device_update_sense_data(cdev);
1857 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1861 if (!cdev->online) {
1865 ret = ccw_device_online(cdev);
1867 goto out_disc_unlock;
1869 cm_enabled = cdev->private->cmb != NULL;
1870 spin_unlock_irq(sch->lock);
1872 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1873 if (cdev->private->state != DEV_STATE_ONLINE) {
1874 spin_lock_irq(sch->lock);
1875 goto out_disc_unlock;
1878 ret = ccw_set_cmf(cdev, 1);
1880 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1881 "(rc=%d)\n", cdev->private->dev_id.ssid,
1882 cdev->private->dev_id.devno, ret);
1888 if (cdev->online && cdev->drv && cdev->drv->restore)
1889 ret = cdev->drv->restore(cdev);
1894 ret = resume_handle_disc(cdev);
1895 spin_unlock_irq(sch->lock);
1901 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
1904 spin_unlock_irq(sch->lock);
1908 static const struct dev_pm_ops ccw_pm_ops = {
1909 .prepare = ccw_device_pm_prepare,
1910 .complete = ccw_device_pm_complete,
1911 .freeze = ccw_device_pm_freeze,
1912 .thaw = ccw_device_pm_thaw,
1913 .restore = ccw_device_pm_restore,
1916 struct bus_type ccw_bus_type = {
1918 .match = ccw_bus_match,
1919 .uevent = ccw_uevent,
1920 .probe = ccw_device_probe,
1921 .remove = ccw_device_remove,
1922 .shutdown = ccw_device_shutdown,
1927 * ccw_driver_register() - register a ccw driver
1928 * @cdriver: driver to be registered
1930 * This function is mainly a wrapper around driver_register().
1932 * %0 on success and a negative error value on failure.
1934 int ccw_driver_register(struct ccw_driver *cdriver)
1936 struct device_driver *drv = &cdriver->driver;
1938 drv->bus = &ccw_bus_type;
1939 drv->name = cdriver->name;
1940 drv->owner = cdriver->owner;
1942 return driver_register(drv);
1946 * ccw_driver_unregister() - deregister a ccw driver
1947 * @cdriver: driver to be deregistered
1949 * This function is mainly a wrapper around driver_unregister().
1951 void ccw_driver_unregister(struct ccw_driver *cdriver)
1953 driver_unregister(&cdriver->driver);
1956 /* Helper func for qdio. */
1957 struct subchannel_id
1958 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1960 struct subchannel *sch;
1962 sch = to_subchannel(cdev->dev.parent);
1966 static void ccw_device_todo(struct work_struct *work)
1968 struct ccw_device_private *priv;
1969 struct ccw_device *cdev;
1970 struct subchannel *sch;
1971 enum cdev_todo todo;
1973 priv = container_of(work, struct ccw_device_private, todo_work);
1975 sch = to_subchannel(cdev->dev.parent);
1976 /* Find out todo. */
1977 spin_lock_irq(cdev->ccwlock);
1979 priv->todo = CDEV_TODO_NOTHING;
1980 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1981 priv->dev_id.ssid, priv->dev_id.devno, todo);
1982 spin_unlock_irq(cdev->ccwlock);
1985 case CDEV_TODO_ENABLE_CMF:
1988 case CDEV_TODO_REBIND:
1989 ccw_device_do_unbind_bind(cdev);
1991 case CDEV_TODO_REGISTER:
1992 io_subchannel_register(cdev);
1994 case CDEV_TODO_UNREG_EVAL:
1995 if (!sch_is_pseudo_sch(sch))
1996 css_schedule_eval(sch->schid);
1998 case CDEV_TODO_UNREG:
1999 if (sch_is_pseudo_sch(sch))
2000 ccw_device_unregister(cdev);
2002 ccw_device_call_sch_unregister(cdev);
2007 /* Release workqueue ref. */
2008 put_device(&cdev->dev);
2012 * ccw_device_sched_todo - schedule ccw device operation
2016 * Schedule the operation identified by @todo to be performed on the slow path
2017 * workqueue. Do nothing if another operation with higher priority is already
2018 * scheduled. Needs to be called with ccwdev lock held.
2020 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2022 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2023 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2025 if (cdev->private->todo >= todo)
2027 cdev->private->todo = todo;
2028 /* Get workqueue ref. */
2029 if (!get_device(&cdev->dev))
2031 if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
2032 /* Already queued, release workqueue ref. */
2033 put_device(&cdev->dev);
2037 MODULE_LICENSE("GPL");
2038 EXPORT_SYMBOL(ccw_device_set_online);
2039 EXPORT_SYMBOL(ccw_device_set_offline);
2040 EXPORT_SYMBOL(ccw_driver_register);
2041 EXPORT_SYMBOL(ccw_driver_unregister);
2042 EXPORT_SYMBOL(get_ccwdev_by_busid);
2043 EXPORT_SYMBOL(ccw_bus_type);
2044 EXPORT_SYMBOL(ccw_device_work);
2045 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);