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"
41 static struct timer_list recovery_timer;
42 static DEFINE_SPINLOCK(recovery_lock);
43 static int recovery_phase;
44 static const unsigned long recovery_delay[] = { 3, 30, 300 };
46 /******************* bus type handling ***********************/
48 /* The Linux driver model distinguishes between a bus type and
49 * the bus itself. Of course we only have one channel
50 * subsystem driver and one channel system per machine, but
51 * we still use the abstraction. T.R. says it's a good idea. */
53 ccw_bus_match (struct device * dev, struct device_driver * drv)
55 struct ccw_device *cdev = to_ccwdev(dev);
56 struct ccw_driver *cdrv = to_ccwdrv(drv);
57 const struct ccw_device_id *ids = cdrv->ids, *found;
62 found = ccw_device_id_match(ids, &cdev->id);
66 cdev->id.driver_info = found->driver_info;
71 /* Store modalias string delimited by prefix/suffix string into buffer with
72 * specified size. Return length of resulting string (excluding trailing '\0')
73 * even if string doesn't fit buffer (snprintf semantics). */
74 static int snprint_alias(char *buf, size_t size,
75 struct ccw_device_id *id, const char *suffix)
79 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
85 if (id->dev_type != 0)
86 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
87 id->dev_model, suffix);
89 len += snprintf(buf, size, "dtdm%s", suffix);
94 /* Set up environment variables for ccw device uevent. Return 0 on success,
95 * non-zero otherwise. */
96 static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
98 struct ccw_device *cdev = to_ccwdev(dev);
99 struct ccw_device_id *id = &(cdev->id);
101 char modalias_buf[30];
104 ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
109 ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
113 /* The next two can be zero, that's ok for us */
115 ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
120 ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
125 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
126 ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
130 static struct bus_type ccw_bus_type;
132 static void io_subchannel_irq(struct subchannel *);
133 static int io_subchannel_probe(struct subchannel *);
134 static int io_subchannel_remove(struct subchannel *);
135 static void io_subchannel_shutdown(struct subchannel *);
136 static int io_subchannel_sch_event(struct subchannel *, int);
137 static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
139 static void recovery_func(unsigned long data);
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 int io_subchannel_settle(void)
166 ret = wait_event_interruptible(ccw_device_init_wq,
167 atomic_read(&ccw_device_init_count) == 0);
170 flush_workqueue(cio_work_q);
174 static struct css_driver io_subchannel_driver = {
176 .owner = THIS_MODULE,
177 .name = "io_subchannel",
179 .subchannel_type = io_subchannel_ids,
180 .irq = io_subchannel_irq,
181 .sch_event = io_subchannel_sch_event,
182 .chp_event = io_subchannel_chp_event,
183 .probe = io_subchannel_probe,
184 .remove = io_subchannel_remove,
185 .shutdown = io_subchannel_shutdown,
186 .prepare = io_subchannel_prepare,
187 .settle = io_subchannel_settle,
190 int __init io_subchannel_init(void)
194 init_waitqueue_head(&ccw_device_init_wq);
195 atomic_set(&ccw_device_init_count, 0);
196 setup_timer(&recovery_timer, recovery_func, 0);
198 ret = bus_register(&ccw_bus_type);
201 ret = css_driver_register(&io_subchannel_driver);
203 bus_unregister(&ccw_bus_type);
209 /************************ device handling **************************/
212 * A ccw_device has some interfaces in sysfs in addition to the
214 * The following entries are designed to export the information which
215 * resided in 2.4 in /proc/subchannels. Subchannel and device number
216 * are obvious, so they don't have an entry :)
217 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
220 chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
222 struct subchannel *sch = to_subchannel(dev);
223 struct chsc_ssd_info *ssd = &sch->ssd_info;
228 for (chp = 0; chp < 8; chp++) {
230 if (ssd->path_mask & mask)
231 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
233 ret += sprintf(buf + ret, "00 ");
235 ret += sprintf (buf+ret, "\n");
236 return min((ssize_t)PAGE_SIZE, ret);
240 pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
242 struct subchannel *sch = to_subchannel(dev);
243 struct pmcw *pmcw = &sch->schib.pmcw;
245 return sprintf (buf, "%02x %02x %02x\n",
246 pmcw->pim, pmcw->pam, pmcw->pom);
250 devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
252 struct ccw_device *cdev = to_ccwdev(dev);
253 struct ccw_device_id *id = &(cdev->id);
255 if (id->dev_type != 0)
256 return sprintf(buf, "%04x/%02x\n",
257 id->dev_type, id->dev_model);
259 return sprintf(buf, "n/a\n");
263 cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
265 struct ccw_device *cdev = to_ccwdev(dev);
266 struct ccw_device_id *id = &(cdev->id);
268 return sprintf(buf, "%04x/%02x\n",
269 id->cu_type, id->cu_model);
273 modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
275 struct ccw_device *cdev = to_ccwdev(dev);
276 struct ccw_device_id *id = &(cdev->id);
279 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
281 return len > PAGE_SIZE ? PAGE_SIZE : len;
285 online_show (struct device *dev, struct device_attribute *attr, char *buf)
287 struct ccw_device *cdev = to_ccwdev(dev);
289 return sprintf(buf, cdev->online ? "1\n" : "0\n");
292 int ccw_device_is_orphan(struct ccw_device *cdev)
294 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
297 static void ccw_device_unregister(struct ccw_device *cdev)
299 if (device_is_registered(&cdev->dev)) {
300 /* Undo device_add(). */
301 device_del(&cdev->dev);
303 if (cdev->private->flags.initialized) {
304 cdev->private->flags.initialized = 0;
305 /* Release reference from device_initialize(). */
306 put_device(&cdev->dev);
310 static void io_subchannel_quiesce(struct subchannel *);
313 * ccw_device_set_offline() - disable a ccw device for I/O
314 * @cdev: target ccw device
316 * This function calls the driver's set_offline() function for @cdev, if
317 * given, and then disables @cdev.
319 * %0 on success and a negative error value on failure.
321 * enabled, ccw device lock not held
323 int ccw_device_set_offline(struct ccw_device *cdev)
325 struct subchannel *sch;
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 sch = to_subchannel(cdev->dev.parent);
341 /* Wait until a final state or DISCONNECTED is reached */
342 while (!dev_fsm_final_state(cdev) &&
343 cdev->private->state != DEV_STATE_DISCONNECTED) {
344 spin_unlock_irq(cdev->ccwlock);
345 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
346 cdev->private->state == DEV_STATE_DISCONNECTED));
347 spin_lock_irq(cdev->ccwlock);
350 ret = ccw_device_offline(cdev);
353 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device "
354 "0.%x.%04x\n", ret, cdev->private->dev_id.ssid,
355 cdev->private->dev_id.devno);
358 state = cdev->private->state;
359 spin_unlock_irq(cdev->ccwlock);
360 io_subchannel_quiesce(sch);
361 spin_lock_irq(cdev->ccwlock);
362 cdev->private->state = state;
363 } while (ret == -EBUSY);
364 spin_unlock_irq(cdev->ccwlock);
365 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
366 cdev->private->state == DEV_STATE_DISCONNECTED));
367 /* Inform the user if set offline failed. */
368 if (cdev->private->state == DEV_STATE_BOXED) {
369 pr_warning("%s: The device entered boxed state while "
370 "being set offline\n", dev_name(&cdev->dev));
371 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
372 pr_warning("%s: The device stopped operating while "
373 "being set offline\n", dev_name(&cdev->dev));
375 /* Give up reference from ccw_device_set_online(). */
376 put_device(&cdev->dev);
380 cdev->private->state = DEV_STATE_OFFLINE;
381 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
382 spin_unlock_irq(cdev->ccwlock);
383 /* Give up reference from ccw_device_set_online(). */
384 put_device(&cdev->dev);
389 * ccw_device_set_online() - enable a ccw device for I/O
390 * @cdev: target ccw device
392 * This function first enables @cdev and then calls the driver's set_online()
393 * function for @cdev, if given. If set_online() returns an error, @cdev is
396 * %0 on success and a negative error value on failure.
398 * enabled, ccw device lock not held
400 int ccw_device_set_online(struct ccw_device *cdev)
407 if (cdev->online || !cdev->drv)
409 /* Hold on to an extra reference while device is online. */
410 if (!get_device(&cdev->dev))
413 spin_lock_irq(cdev->ccwlock);
414 ret = ccw_device_online(cdev);
415 spin_unlock_irq(cdev->ccwlock);
417 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
419 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
420 "device 0.%x.%04x\n",
421 ret, cdev->private->dev_id.ssid,
422 cdev->private->dev_id.devno);
423 /* Give up online reference since onlining failed. */
424 put_device(&cdev->dev);
427 spin_lock_irq(cdev->ccwlock);
428 /* Check if online processing was successful */
429 if ((cdev->private->state != DEV_STATE_ONLINE) &&
430 (cdev->private->state != DEV_STATE_W4SENSE)) {
431 spin_unlock_irq(cdev->ccwlock);
432 /* Inform the user that set online failed. */
433 if (cdev->private->state == DEV_STATE_BOXED) {
434 pr_warning("%s: Setting the device online failed "
435 "because it is boxed\n",
436 dev_name(&cdev->dev));
437 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
438 pr_warning("%s: Setting the device online failed "
439 "because it is not operational\n",
440 dev_name(&cdev->dev));
442 /* Give up online reference since onlining failed. */
443 put_device(&cdev->dev);
446 spin_unlock_irq(cdev->ccwlock);
447 if (cdev->drv->set_online)
448 ret = cdev->drv->set_online(cdev);
455 spin_lock_irq(cdev->ccwlock);
456 /* Wait until a final state or DISCONNECTED is reached */
457 while (!dev_fsm_final_state(cdev) &&
458 cdev->private->state != DEV_STATE_DISCONNECTED) {
459 spin_unlock_irq(cdev->ccwlock);
460 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
461 cdev->private->state == DEV_STATE_DISCONNECTED));
462 spin_lock_irq(cdev->ccwlock);
464 ret2 = ccw_device_offline(cdev);
467 spin_unlock_irq(cdev->ccwlock);
468 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
469 cdev->private->state == DEV_STATE_DISCONNECTED));
470 /* Give up online reference since onlining failed. */
471 put_device(&cdev->dev);
475 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
476 "device 0.%x.%04x\n",
477 ret2, cdev->private->dev_id.ssid,
478 cdev->private->dev_id.devno);
479 cdev->private->state = DEV_STATE_OFFLINE;
480 spin_unlock_irq(cdev->ccwlock);
481 /* Give up online reference since onlining failed. */
482 put_device(&cdev->dev);
486 static int online_store_handle_offline(struct ccw_device *cdev)
488 if (cdev->private->state == DEV_STATE_DISCONNECTED) {
489 spin_lock_irq(cdev->ccwlock);
490 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
491 spin_unlock_irq(cdev->ccwlock);
494 if (cdev->drv && cdev->drv->set_offline)
495 return ccw_device_set_offline(cdev);
499 static int online_store_recog_and_online(struct ccw_device *cdev)
501 /* Do device recognition, if needed. */
502 if (cdev->private->state == DEV_STATE_BOXED) {
503 spin_lock_irq(cdev->ccwlock);
504 ccw_device_recognition(cdev);
505 spin_unlock_irq(cdev->ccwlock);
506 wait_event(cdev->private->wait_q,
507 cdev->private->flags.recog_done);
508 if (cdev->private->state != DEV_STATE_OFFLINE)
509 /* recognition failed */
512 if (cdev->drv && cdev->drv->set_online)
513 return ccw_device_set_online(cdev);
517 static int online_store_handle_online(struct ccw_device *cdev, int force)
521 ret = online_store_recog_and_online(cdev);
524 if (force && cdev->private->state == DEV_STATE_BOXED) {
525 ret = ccw_device_stlck(cdev);
528 if (cdev->id.cu_type == 0)
529 cdev->private->state = DEV_STATE_NOT_OPER;
530 ret = online_store_recog_and_online(cdev);
537 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
538 const char *buf, size_t count)
540 struct ccw_device *cdev = to_ccwdev(dev);
544 if (!dev_fsm_final_state(cdev) &&
545 cdev->private->state != DEV_STATE_DISCONNECTED)
547 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
550 if (cdev->drv && !try_module_get(cdev->drv->driver.owner)) {
551 atomic_set(&cdev->private->onoff, 0);
554 if (!strncmp(buf, "force\n", count)) {
560 ret = strict_strtoul(buf, 16, &i);
566 ret = online_store_handle_offline(cdev);
569 ret = online_store_handle_online(cdev, force);
576 module_put(cdev->drv->driver.owner);
577 atomic_set(&cdev->private->onoff, 0);
578 return (ret < 0) ? ret : count;
582 available_show (struct device *dev, struct device_attribute *attr, char *buf)
584 struct ccw_device *cdev = to_ccwdev(dev);
585 struct subchannel *sch;
587 if (ccw_device_is_orphan(cdev))
588 return sprintf(buf, "no device\n");
589 switch (cdev->private->state) {
590 case DEV_STATE_BOXED:
591 return sprintf(buf, "boxed\n");
592 case DEV_STATE_DISCONNECTED:
593 case DEV_STATE_DISCONNECTED_SENSE_ID:
594 case DEV_STATE_NOT_OPER:
595 sch = to_subchannel(dev->parent);
597 return sprintf(buf, "no path\n");
599 return sprintf(buf, "no device\n");
601 /* All other states considered fine. */
602 return sprintf(buf, "good\n");
607 initiate_logging(struct device *dev, struct device_attribute *attr,
608 const char *buf, size_t count)
610 struct subchannel *sch = to_subchannel(dev);
613 rc = chsc_siosl(sch->schid);
615 pr_warning("Logging for subchannel 0.%x.%04x failed with "
617 sch->schid.ssid, sch->schid.sch_no, rc);
620 pr_notice("Logging for subchannel 0.%x.%04x was triggered\n",
621 sch->schid.ssid, sch->schid.sch_no);
625 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
626 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
627 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
628 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
629 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
630 static DEVICE_ATTR(online, 0644, online_show, online_store);
631 static DEVICE_ATTR(availability, 0444, available_show, NULL);
632 static DEVICE_ATTR(logging, 0200, NULL, initiate_logging);
634 static struct attribute *io_subchannel_attrs[] = {
635 &dev_attr_chpids.attr,
636 &dev_attr_pimpampom.attr,
637 &dev_attr_logging.attr,
641 static struct attribute_group io_subchannel_attr_group = {
642 .attrs = io_subchannel_attrs,
645 static struct attribute * ccwdev_attrs[] = {
646 &dev_attr_devtype.attr,
647 &dev_attr_cutype.attr,
648 &dev_attr_modalias.attr,
649 &dev_attr_online.attr,
650 &dev_attr_cmb_enable.attr,
651 &dev_attr_availability.attr,
655 static struct attribute_group ccwdev_attr_group = {
656 .attrs = ccwdev_attrs,
659 static const struct attribute_group *ccwdev_attr_groups[] = {
664 /* this is a simple abstraction for device_register that sets the
665 * correct bus type and adds the bus specific files */
666 static int ccw_device_register(struct ccw_device *cdev)
668 struct device *dev = &cdev->dev;
671 dev->bus = &ccw_bus_type;
672 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
673 cdev->private->dev_id.devno);
676 return device_add(dev);
679 static int match_dev_id(struct device *dev, void *data)
681 struct ccw_device *cdev = to_ccwdev(dev);
682 struct ccw_dev_id *dev_id = data;
684 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
687 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
691 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
693 return dev ? to_ccwdev(dev) : NULL;
696 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
700 if (device_is_registered(&cdev->dev)) {
701 device_release_driver(&cdev->dev);
702 ret = device_attach(&cdev->dev);
703 WARN_ON(ret == -ENODEV);
708 ccw_device_release(struct device *dev)
710 struct ccw_device *cdev;
712 cdev = to_ccwdev(dev);
713 /* Release reference of parent subchannel. */
714 put_device(cdev->dev.parent);
715 kfree(cdev->private);
719 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
721 struct ccw_device *cdev;
723 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
725 cdev->private = kzalloc(sizeof(struct ccw_device_private),
726 GFP_KERNEL | GFP_DMA);
731 return ERR_PTR(-ENOMEM);
734 static void ccw_device_todo(struct work_struct *work);
736 static int io_subchannel_initialize_dev(struct subchannel *sch,
737 struct ccw_device *cdev)
739 cdev->private->cdev = cdev;
740 atomic_set(&cdev->private->onoff, 0);
741 cdev->dev.parent = &sch->dev;
742 cdev->dev.release = ccw_device_release;
743 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
744 cdev->dev.groups = ccwdev_attr_groups;
745 /* Do first half of device_register. */
746 device_initialize(&cdev->dev);
747 if (!get_device(&sch->dev)) {
748 /* Release reference from device_initialize(). */
749 put_device(&cdev->dev);
752 cdev->private->flags.initialized = 1;
756 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
758 struct ccw_device *cdev;
761 cdev = io_subchannel_allocate_dev(sch);
763 ret = io_subchannel_initialize_dev(sch, cdev);
770 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
772 static void sch_create_and_recog_new_device(struct subchannel *sch)
774 struct ccw_device *cdev;
776 /* Need to allocate a new ccw device. */
777 cdev = io_subchannel_create_ccwdev(sch);
779 /* OK, we did everything we could... */
780 css_sch_device_unregister(sch);
783 /* Start recognition for the new ccw device. */
784 io_subchannel_recog(cdev, sch);
788 * Register recognized device.
790 static void io_subchannel_register(struct ccw_device *cdev)
792 struct subchannel *sch;
793 int ret, adjust_init_count = 1;
796 sch = to_subchannel(cdev->dev.parent);
798 * Check if subchannel is still registered. It may have become
799 * unregistered if a machine check hit us after finishing
800 * device recognition but before the register work could be
803 if (!device_is_registered(&sch->dev))
805 css_update_ssd_info(sch);
807 * io_subchannel_register() will also be called after device
808 * recognition has been done for a boxed device (which will already
809 * be registered). We need to reprobe since we may now have sense id
812 if (device_is_registered(&cdev->dev)) {
814 ret = device_reprobe(&cdev->dev);
816 /* We can't do much here. */
817 CIO_MSG_EVENT(0, "device_reprobe() returned"
818 " %d for 0.%x.%04x\n", ret,
819 cdev->private->dev_id.ssid,
820 cdev->private->dev_id.devno);
822 adjust_init_count = 0;
826 * Now we know this subchannel will stay, we can throw
827 * our delayed uevent.
829 dev_set_uevent_suppress(&sch->dev, 0);
830 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
831 /* make it known to the system */
832 ret = ccw_device_register(cdev);
834 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
835 cdev->private->dev_id.ssid,
836 cdev->private->dev_id.devno, ret);
837 spin_lock_irqsave(sch->lock, flags);
838 sch_set_cdev(sch, NULL);
839 spin_unlock_irqrestore(sch->lock, flags);
840 /* Release initial device reference. */
841 put_device(&cdev->dev);
845 cdev->private->flags.recog_done = 1;
846 wake_up(&cdev->private->wait_q);
848 if (adjust_init_count && atomic_dec_and_test(&ccw_device_init_count))
849 wake_up(&ccw_device_init_wq);
852 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
854 struct subchannel *sch;
856 /* Get subchannel reference for local processing. */
857 if (!get_device(cdev->dev.parent))
859 sch = to_subchannel(cdev->dev.parent);
860 css_sch_device_unregister(sch);
861 /* Release subchannel reference for local processing. */
862 put_device(&sch->dev);
866 * subchannel recognition done. Called from the state machine.
869 io_subchannel_recog_done(struct ccw_device *cdev)
871 if (css_init_done == 0) {
872 cdev->private->flags.recog_done = 1;
875 switch (cdev->private->state) {
876 case DEV_STATE_BOXED:
877 /* Device did not respond in time. */
878 case DEV_STATE_NOT_OPER:
879 cdev->private->flags.recog_done = 1;
880 /* Remove device found not operational. */
881 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
882 if (atomic_dec_and_test(&ccw_device_init_count))
883 wake_up(&ccw_device_init_wq);
885 case DEV_STATE_OFFLINE:
887 * We can't register the device in interrupt context so
888 * we schedule a work item.
890 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
895 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
897 struct ccw_device_private *priv;
899 cdev->ccwlock = sch->lock;
901 /* Init private data. */
902 priv = cdev->private;
903 priv->dev_id.devno = sch->schib.pmcw.dev;
904 priv->dev_id.ssid = sch->schid.ssid;
905 priv->schid = sch->schid;
906 priv->state = DEV_STATE_NOT_OPER;
907 INIT_LIST_HEAD(&priv->cmb_list);
908 init_waitqueue_head(&priv->wait_q);
909 init_timer(&priv->timer);
911 /* Increase counter of devices currently in recognition. */
912 atomic_inc(&ccw_device_init_count);
914 /* Start async. device sensing. */
915 spin_lock_irq(sch->lock);
916 sch_set_cdev(sch, cdev);
917 ccw_device_recognition(cdev);
918 spin_unlock_irq(sch->lock);
921 static int ccw_device_move_to_sch(struct ccw_device *cdev,
922 struct subchannel *sch)
924 struct subchannel *old_sch;
925 int rc, old_enabled = 0;
927 old_sch = to_subchannel(cdev->dev.parent);
928 /* Obtain child reference for new parent. */
929 if (!get_device(&sch->dev))
932 if (!sch_is_pseudo_sch(old_sch)) {
933 spin_lock_irq(old_sch->lock);
934 old_enabled = old_sch->schib.pmcw.ena;
937 rc = cio_disable_subchannel(old_sch);
938 spin_unlock_irq(old_sch->lock);
940 /* Release child reference for new parent. */
941 put_device(&sch->dev);
946 mutex_lock(&sch->reg_mutex);
947 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
948 mutex_unlock(&sch->reg_mutex);
950 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
951 cdev->private->dev_id.ssid,
952 cdev->private->dev_id.devno, sch->schid.ssid,
953 sch->schib.pmcw.dev, rc);
955 /* Try to reenable the old subchannel. */
956 spin_lock_irq(old_sch->lock);
957 cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
958 spin_unlock_irq(old_sch->lock);
960 /* Release child reference for new parent. */
961 put_device(&sch->dev);
964 /* Clean up old subchannel. */
965 if (!sch_is_pseudo_sch(old_sch)) {
966 spin_lock_irq(old_sch->lock);
967 sch_set_cdev(old_sch, NULL);
968 spin_unlock_irq(old_sch->lock);
969 css_schedule_eval(old_sch->schid);
971 /* Release child reference for old parent. */
972 put_device(&old_sch->dev);
973 /* Initialize new subchannel. */
974 spin_lock_irq(sch->lock);
975 cdev->private->schid = sch->schid;
976 cdev->ccwlock = sch->lock;
977 if (!sch_is_pseudo_sch(sch))
978 sch_set_cdev(sch, cdev);
979 spin_unlock_irq(sch->lock);
980 if (!sch_is_pseudo_sch(sch))
981 css_update_ssd_info(sch);
985 static int ccw_device_move_to_orph(struct ccw_device *cdev)
987 struct subchannel *sch = to_subchannel(cdev->dev.parent);
988 struct channel_subsystem *css = to_css(sch->dev.parent);
990 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
993 static void io_subchannel_irq(struct subchannel *sch)
995 struct ccw_device *cdev;
997 cdev = sch_get_cdev(sch);
999 CIO_TRACE_EVENT(6, "IRQ");
1000 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
1002 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1005 void io_subchannel_init_config(struct subchannel *sch)
1007 memset(&sch->config, 0, sizeof(sch->config));
1008 sch->config.csense = 1;
1011 static void io_subchannel_init_fields(struct subchannel *sch)
1013 if (cio_is_console(sch->schid))
1016 sch->opm = chp_get_sch_opm(sch);
1017 sch->lpm = sch->schib.pmcw.pam & sch->opm;
1018 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1020 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1021 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1022 sch->schib.pmcw.dev, sch->schid.ssid,
1023 sch->schid.sch_no, sch->schib.pmcw.pim,
1024 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
1026 io_subchannel_init_config(sch);
1030 * Note: We always return 0 so that we bind to the device even on error.
1031 * This is needed so that our remove function is called on unregister.
1033 static int io_subchannel_probe(struct subchannel *sch)
1035 struct io_subchannel_private *io_priv;
1036 struct ccw_device *cdev;
1039 if (cio_is_console(sch->schid)) {
1040 rc = sysfs_create_group(&sch->dev.kobj,
1041 &io_subchannel_attr_group);
1043 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1044 "attributes for subchannel "
1045 "0.%x.%04x (rc=%d)\n",
1046 sch->schid.ssid, sch->schid.sch_no, rc);
1048 * The console subchannel already has an associated ccw_device.
1049 * Throw the delayed uevent for the subchannel, register
1050 * the ccw_device and exit.
1052 dev_set_uevent_suppress(&sch->dev, 0);
1053 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1054 cdev = sch_get_cdev(sch);
1055 cdev->dev.groups = ccwdev_attr_groups;
1056 device_initialize(&cdev->dev);
1057 cdev->private->flags.initialized = 1;
1058 ccw_device_register(cdev);
1060 * Check if the device is already online. If it is
1061 * the reference count needs to be corrected since we
1062 * didn't obtain a reference in ccw_device_set_online.
1064 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1065 cdev->private->state != DEV_STATE_OFFLINE &&
1066 cdev->private->state != DEV_STATE_BOXED)
1067 get_device(&cdev->dev);
1070 io_subchannel_init_fields(sch);
1071 rc = cio_commit_config(sch);
1074 rc = sysfs_create_group(&sch->dev.kobj,
1075 &io_subchannel_attr_group);
1078 /* Allocate I/O subchannel private data. */
1079 io_priv = kzalloc(sizeof(*io_priv), GFP_KERNEL | GFP_DMA);
1083 set_io_private(sch, io_priv);
1084 css_schedule_eval(sch->schid);
1088 spin_lock_irq(sch->lock);
1089 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1090 spin_unlock_irq(sch->lock);
1095 io_subchannel_remove (struct subchannel *sch)
1097 struct io_subchannel_private *io_priv = to_io_private(sch);
1098 struct ccw_device *cdev;
1100 cdev = sch_get_cdev(sch);
1103 io_subchannel_quiesce(sch);
1104 /* Set ccw device to not operational and drop reference. */
1105 spin_lock_irq(cdev->ccwlock);
1106 sch_set_cdev(sch, NULL);
1107 set_io_private(sch, NULL);
1108 cdev->private->state = DEV_STATE_NOT_OPER;
1109 spin_unlock_irq(cdev->ccwlock);
1110 ccw_device_unregister(cdev);
1113 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1117 static void io_subchannel_verify(struct subchannel *sch)
1119 struct ccw_device *cdev;
1121 cdev = sch_get_cdev(sch);
1123 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1126 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1128 struct ccw_device *cdev;
1130 cdev = sch_get_cdev(sch);
1133 if (cio_update_schib(sch))
1135 /* Check for I/O on path. */
1136 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1138 if (cdev->private->state == DEV_STATE_ONLINE) {
1139 ccw_device_kill_io(cdev);
1145 /* Trigger path verification. */
1146 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1150 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1153 static int io_subchannel_chp_event(struct subchannel *sch,
1154 struct chp_link *link, int event)
1156 struct ccw_device *cdev = sch_get_cdev(sch);
1159 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1167 cdev->private->path_gone_mask |= mask;
1168 io_subchannel_terminate_path(sch, mask);
1174 cdev->private->path_new_mask |= mask;
1175 io_subchannel_verify(sch);
1178 if (cio_update_schib(sch))
1181 cdev->private->path_gone_mask |= mask;
1182 io_subchannel_terminate_path(sch, mask);
1185 if (cio_update_schib(sch))
1187 sch->lpm |= mask & sch->opm;
1189 cdev->private->path_new_mask |= mask;
1190 io_subchannel_verify(sch);
1196 static void io_subchannel_quiesce(struct subchannel *sch)
1198 struct ccw_device *cdev;
1201 spin_lock_irq(sch->lock);
1202 cdev = sch_get_cdev(sch);
1203 if (cio_is_console(sch->schid))
1205 if (!sch->schib.pmcw.ena)
1207 ret = cio_disable_subchannel(sch);
1211 cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
1212 while (ret == -EBUSY) {
1213 cdev->private->state = DEV_STATE_QUIESCE;
1214 cdev->private->iretry = 255;
1215 ret = ccw_device_cancel_halt_clear(cdev);
1216 if (ret == -EBUSY) {
1217 ccw_device_set_timeout(cdev, HZ/10);
1218 spin_unlock_irq(sch->lock);
1219 wait_event(cdev->private->wait_q,
1220 cdev->private->state != DEV_STATE_QUIESCE);
1221 spin_lock_irq(sch->lock);
1223 ret = cio_disable_subchannel(sch);
1226 spin_unlock_irq(sch->lock);
1229 static void io_subchannel_shutdown(struct subchannel *sch)
1231 io_subchannel_quiesce(sch);
1234 static int device_is_disconnected(struct ccw_device *cdev)
1238 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1239 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1242 static int recovery_check(struct device *dev, void *data)
1244 struct ccw_device *cdev = to_ccwdev(dev);
1247 spin_lock_irq(cdev->ccwlock);
1248 switch (cdev->private->state) {
1249 case DEV_STATE_DISCONNECTED:
1250 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1251 cdev->private->dev_id.ssid,
1252 cdev->private->dev_id.devno);
1253 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1256 case DEV_STATE_DISCONNECTED_SENSE_ID:
1260 spin_unlock_irq(cdev->ccwlock);
1265 static void recovery_work_func(struct work_struct *unused)
1269 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1271 spin_lock_irq(&recovery_lock);
1272 if (!timer_pending(&recovery_timer)) {
1273 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1275 mod_timer(&recovery_timer, jiffies +
1276 recovery_delay[recovery_phase] * HZ);
1278 spin_unlock_irq(&recovery_lock);
1280 CIO_MSG_EVENT(4, "recovery: end\n");
1283 static DECLARE_WORK(recovery_work, recovery_work_func);
1285 static void recovery_func(unsigned long data)
1288 * We can't do our recovery in softirq context and it's not
1289 * performance critical, so we schedule it.
1291 schedule_work(&recovery_work);
1294 static void ccw_device_schedule_recovery(void)
1296 unsigned long flags;
1298 CIO_MSG_EVENT(4, "recovery: schedule\n");
1299 spin_lock_irqsave(&recovery_lock, flags);
1300 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1302 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1304 spin_unlock_irqrestore(&recovery_lock, flags);
1307 static int purge_fn(struct device *dev, void *data)
1309 struct ccw_device *cdev = to_ccwdev(dev);
1310 struct ccw_dev_id *id = &cdev->private->dev_id;
1312 spin_lock_irq(cdev->ccwlock);
1313 if (is_blacklisted(id->ssid, id->devno) &&
1314 (cdev->private->state == DEV_STATE_OFFLINE)) {
1315 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1317 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1319 spin_unlock_irq(cdev->ccwlock);
1320 /* Abort loop in case of pending signal. */
1321 if (signal_pending(current))
1328 * ccw_purge_blacklisted - purge unused, blacklisted devices
1330 * Unregister all ccw devices that are offline and on the blacklist.
1332 int ccw_purge_blacklisted(void)
1334 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1335 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1339 void ccw_device_set_disconnected(struct ccw_device *cdev)
1343 ccw_device_set_timeout(cdev, 0);
1344 cdev->private->flags.fake_irb = 0;
1345 cdev->private->state = DEV_STATE_DISCONNECTED;
1347 ccw_device_schedule_recovery();
1350 void ccw_device_set_notoper(struct ccw_device *cdev)
1352 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1354 CIO_TRACE_EVENT(2, "notoper");
1355 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1356 ccw_device_set_timeout(cdev, 0);
1357 cio_disable_subchannel(sch);
1358 cdev->private->state = DEV_STATE_NOT_OPER;
1361 enum io_sch_action {
1365 IO_SCH_UNREG_ATTACH,
1373 static enum io_sch_action sch_get_action(struct subchannel *sch)
1375 struct ccw_device *cdev;
1377 cdev = sch_get_cdev(sch);
1378 if (cio_update_schib(sch)) {
1379 /* Not operational. */
1381 return IO_SCH_UNREG;
1382 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1383 return IO_SCH_UNREG;
1384 return IO_SCH_ORPH_UNREG;
1388 return IO_SCH_ATTACH;
1389 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1390 if (ccw_device_notify(cdev, CIO_GONE) != NOTIFY_OK)
1391 return IO_SCH_UNREG_ATTACH;
1392 return IO_SCH_ORPH_ATTACH;
1394 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1395 if (ccw_device_notify(cdev, CIO_NO_PATH) != NOTIFY_OK)
1396 return IO_SCH_UNREG;
1399 if (device_is_disconnected(cdev))
1400 return IO_SCH_REPROBE;
1402 return IO_SCH_VERIFY;
1407 * io_subchannel_sch_event - process subchannel event
1409 * @process: non-zero if function is called in process context
1411 * An unspecified event occurred for this subchannel. Adjust data according
1412 * to the current operational state of the subchannel and device. Return
1413 * zero when the event has been handled sufficiently or -EAGAIN when this
1414 * function should be called again in process context.
1416 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1418 unsigned long flags;
1419 struct ccw_device *cdev;
1420 struct ccw_dev_id dev_id;
1421 enum io_sch_action action;
1424 spin_lock_irqsave(sch->lock, flags);
1425 if (!device_is_registered(&sch->dev))
1427 if (work_pending(&sch->todo_work))
1429 cdev = sch_get_cdev(sch);
1430 if (cdev && work_pending(&cdev->private->todo_work))
1432 action = sch_get_action(sch);
1433 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1434 sch->schid.ssid, sch->schid.sch_no, process,
1436 /* Perform immediate actions while holding the lock. */
1438 case IO_SCH_REPROBE:
1439 /* Trigger device recognition. */
1440 ccw_device_trigger_reprobe(cdev);
1444 if (cdev->private->flags.resuming == 1) {
1445 if (cio_enable_subchannel(sch, (u32)(addr_t)sch)) {
1446 ccw_device_set_notoper(cdev);
1450 /* Trigger path verification. */
1451 io_subchannel_verify(sch);
1455 ccw_device_set_disconnected(cdev);
1458 case IO_SCH_ORPH_UNREG:
1459 case IO_SCH_ORPH_ATTACH:
1460 ccw_device_set_disconnected(cdev);
1462 case IO_SCH_UNREG_ATTACH:
1466 if (cdev->private->state == DEV_STATE_SENSE_ID) {
1468 * Note: delayed work triggered by this event
1469 * and repeated calls to sch_event are synchronized
1470 * by the above check for work_pending(cdev).
1472 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1474 ccw_device_set_notoper(cdev);
1482 spin_unlock_irqrestore(sch->lock, flags);
1483 /* All other actions require process context. */
1486 /* Handle attached ccw device. */
1488 case IO_SCH_ORPH_UNREG:
1489 case IO_SCH_ORPH_ATTACH:
1490 /* Move ccw device to orphanage. */
1491 rc = ccw_device_move_to_orph(cdev);
1495 case IO_SCH_UNREG_ATTACH:
1496 if (cdev->private->flags.resuming) {
1497 /* Device will be handled later. */
1501 /* Unregister ccw device. */
1502 ccw_device_unregister(cdev);
1507 /* Handle subchannel. */
1509 case IO_SCH_ORPH_UNREG:
1511 if (!cdev || !cdev->private->flags.resuming)
1512 css_sch_device_unregister(sch);
1514 case IO_SCH_ORPH_ATTACH:
1515 case IO_SCH_UNREG_ATTACH:
1517 dev_id.ssid = sch->schid.ssid;
1518 dev_id.devno = sch->schib.pmcw.dev;
1519 cdev = get_ccwdev_by_dev_id(&dev_id);
1521 sch_create_and_recog_new_device(sch);
1524 rc = ccw_device_move_to_sch(cdev, sch);
1526 /* Release reference from get_ccwdev_by_dev_id() */
1527 put_device(&cdev->dev);
1530 spin_lock_irqsave(sch->lock, flags);
1531 ccw_device_trigger_reprobe(cdev);
1532 spin_unlock_irqrestore(sch->lock, flags);
1533 /* Release reference from get_ccwdev_by_dev_id() */
1534 put_device(&cdev->dev);
1542 spin_unlock_irqrestore(sch->lock, flags);
1547 #ifdef CONFIG_CCW_CONSOLE
1548 static struct ccw_device console_cdev;
1549 static struct ccw_device_private console_private;
1550 static int console_cdev_in_use;
1552 static DEFINE_SPINLOCK(ccw_console_lock);
1554 spinlock_t * cio_get_console_lock(void)
1556 return &ccw_console_lock;
1559 static int ccw_device_console_enable(struct ccw_device *cdev,
1560 struct subchannel *sch)
1562 struct io_subchannel_private *io_priv = cio_get_console_priv();
1565 /* Attach subchannel private data. */
1566 memset(io_priv, 0, sizeof(*io_priv));
1567 set_io_private(sch, io_priv);
1568 io_subchannel_init_fields(sch);
1569 rc = cio_commit_config(sch);
1572 sch->driver = &io_subchannel_driver;
1573 /* Initialize the ccw_device structure. */
1574 cdev->dev.parent= &sch->dev;
1575 sch_set_cdev(sch, cdev);
1576 io_subchannel_recog(cdev, sch);
1577 /* Now wait for the async. recognition to come to an end. */
1578 spin_lock_irq(cdev->ccwlock);
1579 while (!dev_fsm_final_state(cdev))
1582 if (cdev->private->state != DEV_STATE_OFFLINE)
1584 ccw_device_online(cdev);
1585 while (!dev_fsm_final_state(cdev))
1587 if (cdev->private->state != DEV_STATE_ONLINE)
1591 spin_unlock_irq(cdev->ccwlock);
1596 ccw_device_probe_console(void)
1598 struct subchannel *sch;
1601 if (xchg(&console_cdev_in_use, 1) != 0)
1602 return ERR_PTR(-EBUSY);
1603 sch = cio_probe_console();
1605 console_cdev_in_use = 0;
1606 return (void *) sch;
1608 memset(&console_cdev, 0, sizeof(struct ccw_device));
1609 memset(&console_private, 0, sizeof(struct ccw_device_private));
1610 console_cdev.private = &console_private;
1611 console_private.cdev = &console_cdev;
1612 ret = ccw_device_console_enable(&console_cdev, sch);
1614 cio_release_console();
1615 console_cdev_in_use = 0;
1616 return ERR_PTR(ret);
1618 console_cdev.online = 1;
1619 return &console_cdev;
1622 static int ccw_device_pm_restore(struct device *dev);
1624 int ccw_device_force_console(void)
1626 if (!console_cdev_in_use)
1628 return ccw_device_pm_restore(&console_cdev.dev);
1630 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1634 * get ccw_device matching the busid, but only if owned by cdrv
1637 __ccwdev_check_busid(struct device *dev, void *id)
1643 return (strcmp(bus_id, dev_name(dev)) == 0);
1648 * get_ccwdev_by_busid() - obtain device from a bus id
1649 * @cdrv: driver the device is owned by
1650 * @bus_id: bus id of the device to be searched
1652 * This function searches all devices owned by @cdrv for a device with a bus
1653 * id matching @bus_id.
1655 * If a match is found, its reference count of the found device is increased
1656 * and it is returned; else %NULL is returned.
1658 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1662 struct device_driver *drv;
1664 drv = get_driver(&cdrv->driver);
1668 dev = driver_find_device(drv, NULL, (void *)bus_id,
1669 __ccwdev_check_busid);
1672 return dev ? to_ccwdev(dev) : NULL;
1675 /************************** device driver handling ************************/
1677 /* This is the implementation of the ccw_driver class. The probe, remove
1678 * and release methods are initially very similar to the device_driver
1679 * implementations, with the difference that they have ccw_device
1682 * A ccw driver also contains the information that is needed for
1686 ccw_device_probe (struct device *dev)
1688 struct ccw_device *cdev = to_ccwdev(dev);
1689 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1692 cdev->drv = cdrv; /* to let the driver call _set_online */
1694 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1705 ccw_device_remove (struct device *dev)
1707 struct ccw_device *cdev = to_ccwdev(dev);
1708 struct ccw_driver *cdrv = cdev->drv;
1715 spin_lock_irq(cdev->ccwlock);
1716 ret = ccw_device_offline(cdev);
1717 spin_unlock_irq(cdev->ccwlock);
1719 wait_event(cdev->private->wait_q,
1720 dev_fsm_final_state(cdev));
1722 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1723 "device 0.%x.%04x\n",
1724 ret, cdev->private->dev_id.ssid,
1725 cdev->private->dev_id.devno);
1726 /* Give up reference obtained in ccw_device_set_online(). */
1727 put_device(&cdev->dev);
1729 ccw_device_set_timeout(cdev, 0);
1734 static void ccw_device_shutdown(struct device *dev)
1736 struct ccw_device *cdev;
1738 cdev = to_ccwdev(dev);
1739 if (cdev->drv && cdev->drv->shutdown)
1740 cdev->drv->shutdown(cdev);
1744 static int ccw_device_pm_prepare(struct device *dev)
1746 struct ccw_device *cdev = to_ccwdev(dev);
1748 if (work_pending(&cdev->private->todo_work))
1750 /* Fail while device is being set online/offline. */
1751 if (atomic_read(&cdev->private->onoff))
1754 if (cdev->online && cdev->drv && cdev->drv->prepare)
1755 return cdev->drv->prepare(cdev);
1760 static void ccw_device_pm_complete(struct device *dev)
1762 struct ccw_device *cdev = to_ccwdev(dev);
1764 if (cdev->online && cdev->drv && cdev->drv->complete)
1765 cdev->drv->complete(cdev);
1768 static int ccw_device_pm_freeze(struct device *dev)
1770 struct ccw_device *cdev = to_ccwdev(dev);
1771 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1772 int ret, cm_enabled;
1774 /* Fail suspend while device is in transistional state. */
1775 if (!dev_fsm_final_state(cdev))
1779 if (cdev->drv && cdev->drv->freeze) {
1780 ret = cdev->drv->freeze(cdev);
1785 spin_lock_irq(sch->lock);
1786 cm_enabled = cdev->private->cmb != NULL;
1787 spin_unlock_irq(sch->lock);
1789 /* Don't have the css write on memory. */
1790 ret = ccw_set_cmf(cdev, 0);
1794 /* From here on, disallow device driver I/O. */
1795 spin_lock_irq(sch->lock);
1796 ret = cio_disable_subchannel(sch);
1797 spin_unlock_irq(sch->lock);
1802 static int ccw_device_pm_thaw(struct device *dev)
1804 struct ccw_device *cdev = to_ccwdev(dev);
1805 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1806 int ret, cm_enabled;
1811 spin_lock_irq(sch->lock);
1812 /* Allow device driver I/O again. */
1813 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1814 cm_enabled = cdev->private->cmb != NULL;
1815 spin_unlock_irq(sch->lock);
1820 ret = ccw_set_cmf(cdev, 1);
1825 if (cdev->drv && cdev->drv->thaw)
1826 ret = cdev->drv->thaw(cdev);
1831 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1833 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1835 spin_lock_irq(sch->lock);
1836 if (cio_is_console(sch->schid)) {
1837 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1841 * While we were sleeping, devices may have gone or become
1842 * available again. Kick re-detection.
1844 cdev->private->flags.resuming = 1;
1845 cdev->private->path_new_mask = LPM_ANYPATH;
1846 css_schedule_eval(sch->schid);
1847 spin_unlock_irq(sch->lock);
1848 css_complete_work();
1850 /* cdev may have been moved to a different subchannel. */
1851 sch = to_subchannel(cdev->dev.parent);
1852 spin_lock_irq(sch->lock);
1853 if (cdev->private->state != DEV_STATE_ONLINE &&
1854 cdev->private->state != DEV_STATE_OFFLINE)
1857 ccw_device_recognition(cdev);
1858 spin_unlock_irq(sch->lock);
1859 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1860 cdev->private->state == DEV_STATE_DISCONNECTED);
1861 spin_lock_irq(sch->lock);
1864 cdev->private->flags.resuming = 0;
1865 spin_unlock_irq(sch->lock);
1868 static int resume_handle_boxed(struct ccw_device *cdev)
1870 cdev->private->state = DEV_STATE_BOXED;
1871 if (ccw_device_notify(cdev, CIO_BOXED) == NOTIFY_OK)
1873 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1877 static int resume_handle_disc(struct ccw_device *cdev)
1879 cdev->private->state = DEV_STATE_DISCONNECTED;
1880 if (ccw_device_notify(cdev, CIO_GONE) == NOTIFY_OK)
1882 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1886 static int ccw_device_pm_restore(struct device *dev)
1888 struct ccw_device *cdev = to_ccwdev(dev);
1889 struct subchannel *sch;
1892 __ccw_device_pm_restore(cdev);
1893 sch = to_subchannel(cdev->dev.parent);
1894 spin_lock_irq(sch->lock);
1895 if (cio_is_console(sch->schid))
1898 /* check recognition results */
1899 switch (cdev->private->state) {
1900 case DEV_STATE_OFFLINE:
1901 case DEV_STATE_ONLINE:
1902 cdev->private->flags.donotify = 0;
1904 case DEV_STATE_BOXED:
1905 ret = resume_handle_boxed(cdev);
1910 ret = resume_handle_disc(cdev);
1915 /* check if the device type has changed */
1916 if (!ccw_device_test_sense_data(cdev)) {
1917 ccw_device_update_sense_data(cdev);
1918 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1925 if (ccw_device_online(cdev)) {
1926 ret = resume_handle_disc(cdev);
1931 spin_unlock_irq(sch->lock);
1932 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1933 spin_lock_irq(sch->lock);
1935 if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_BAD) {
1936 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1941 /* reenable cmf, if needed */
1942 if (cdev->private->cmb) {
1943 spin_unlock_irq(sch->lock);
1944 ret = ccw_set_cmf(cdev, 1);
1945 spin_lock_irq(sch->lock);
1947 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1948 "(rc=%d)\n", cdev->private->dev_id.ssid,
1949 cdev->private->dev_id.devno, ret);
1955 spin_unlock_irq(sch->lock);
1956 if (cdev->online && cdev->drv && cdev->drv->restore)
1957 ret = cdev->drv->restore(cdev);
1961 spin_unlock_irq(sch->lock);
1965 static const struct dev_pm_ops ccw_pm_ops = {
1966 .prepare = ccw_device_pm_prepare,
1967 .complete = ccw_device_pm_complete,
1968 .freeze = ccw_device_pm_freeze,
1969 .thaw = ccw_device_pm_thaw,
1970 .restore = ccw_device_pm_restore,
1973 static struct bus_type ccw_bus_type = {
1975 .match = ccw_bus_match,
1976 .uevent = ccw_uevent,
1977 .probe = ccw_device_probe,
1978 .remove = ccw_device_remove,
1979 .shutdown = ccw_device_shutdown,
1984 * ccw_driver_register() - register a ccw driver
1985 * @cdriver: driver to be registered
1987 * This function is mainly a wrapper around driver_register().
1989 * %0 on success and a negative error value on failure.
1991 int ccw_driver_register(struct ccw_driver *cdriver)
1993 struct device_driver *drv = &cdriver->driver;
1995 drv->bus = &ccw_bus_type;
1997 return driver_register(drv);
2001 * ccw_driver_unregister() - deregister a ccw driver
2002 * @cdriver: driver to be deregistered
2004 * This function is mainly a wrapper around driver_unregister().
2006 void ccw_driver_unregister(struct ccw_driver *cdriver)
2008 driver_unregister(&cdriver->driver);
2011 /* Helper func for qdio. */
2012 struct subchannel_id
2013 ccw_device_get_subchannel_id(struct ccw_device *cdev)
2015 struct subchannel *sch;
2017 sch = to_subchannel(cdev->dev.parent);
2021 static void ccw_device_todo(struct work_struct *work)
2023 struct ccw_device_private *priv;
2024 struct ccw_device *cdev;
2025 struct subchannel *sch;
2026 enum cdev_todo todo;
2028 priv = container_of(work, struct ccw_device_private, todo_work);
2030 sch = to_subchannel(cdev->dev.parent);
2031 /* Find out todo. */
2032 spin_lock_irq(cdev->ccwlock);
2034 priv->todo = CDEV_TODO_NOTHING;
2035 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
2036 priv->dev_id.ssid, priv->dev_id.devno, todo);
2037 spin_unlock_irq(cdev->ccwlock);
2040 case CDEV_TODO_ENABLE_CMF:
2043 case CDEV_TODO_REBIND:
2044 ccw_device_do_unbind_bind(cdev);
2046 case CDEV_TODO_REGISTER:
2047 io_subchannel_register(cdev);
2049 case CDEV_TODO_UNREG_EVAL:
2050 if (!sch_is_pseudo_sch(sch))
2051 css_schedule_eval(sch->schid);
2053 case CDEV_TODO_UNREG:
2054 if (sch_is_pseudo_sch(sch))
2055 ccw_device_unregister(cdev);
2057 ccw_device_call_sch_unregister(cdev);
2062 /* Release workqueue ref. */
2063 put_device(&cdev->dev);
2067 * ccw_device_sched_todo - schedule ccw device operation
2071 * Schedule the operation identified by @todo to be performed on the slow path
2072 * workqueue. Do nothing if another operation with higher priority is already
2073 * scheduled. Needs to be called with ccwdev lock held.
2075 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2077 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2078 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2080 if (cdev->private->todo >= todo)
2082 cdev->private->todo = todo;
2083 /* Get workqueue ref. */
2084 if (!get_device(&cdev->dev))
2086 if (!queue_work(cio_work_q, &cdev->private->todo_work)) {
2087 /* Already queued, release workqueue ref. */
2088 put_device(&cdev->dev);
2093 * ccw_device_siosl() - initiate logging
2096 * This function is used to invoke model-dependent logging within the channel
2099 int ccw_device_siosl(struct ccw_device *cdev)
2101 struct subchannel *sch = to_subchannel(cdev->dev.parent);
2103 return chsc_siosl(sch->schid);
2105 EXPORT_SYMBOL_GPL(ccw_device_siosl);
2107 MODULE_LICENSE("GPL");
2108 EXPORT_SYMBOL(ccw_device_set_online);
2109 EXPORT_SYMBOL(ccw_device_set_offline);
2110 EXPORT_SYMBOL(ccw_driver_register);
2111 EXPORT_SYMBOL(ccw_driver_unregister);
2112 EXPORT_SYMBOL(get_ccwdev_by_busid);
2113 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);