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);
318 * ccw_device_set_offline() - disable a ccw device for I/O
319 * @cdev: target ccw device
321 * This function calls the driver's set_offline() function for @cdev, if
322 * given, and then disables @cdev.
324 * %0 on success and a negative error value on failure.
326 * enabled, ccw device lock not held
328 int ccw_device_set_offline(struct ccw_device *cdev)
334 if (!cdev->online || !cdev->drv)
337 if (cdev->drv->set_offline) {
338 ret = cdev->drv->set_offline(cdev);
343 spin_lock_irq(cdev->ccwlock);
344 /* Wait until a final state or DISCONNECTED is reached */
345 while (!dev_fsm_final_state(cdev) &&
346 cdev->private->state != DEV_STATE_DISCONNECTED) {
347 spin_unlock_irq(cdev->ccwlock);
348 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
349 cdev->private->state == DEV_STATE_DISCONNECTED));
350 spin_lock_irq(cdev->ccwlock);
352 ret = ccw_device_offline(cdev);
355 spin_unlock_irq(cdev->ccwlock);
356 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
357 cdev->private->state == DEV_STATE_DISCONNECTED));
358 /* Inform the user if set offline failed. */
359 if (cdev->private->state == DEV_STATE_BOXED) {
360 pr_warning("%s: The device entered boxed state while "
361 "being set offline\n", dev_name(&cdev->dev));
362 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
363 pr_warning("%s: The device stopped operating while "
364 "being set offline\n", dev_name(&cdev->dev));
366 /* Give up reference from ccw_device_set_online(). */
367 put_device(&cdev->dev);
371 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
372 ret, cdev->private->dev_id.ssid,
373 cdev->private->dev_id.devno);
374 cdev->private->state = DEV_STATE_OFFLINE;
375 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
376 spin_unlock_irq(cdev->ccwlock);
377 /* Give up reference from ccw_device_set_online(). */
378 put_device(&cdev->dev);
383 * ccw_device_set_online() - enable a ccw device for I/O
384 * @cdev: target ccw device
386 * This function first enables @cdev and then calls the driver's set_online()
387 * function for @cdev, if given. If set_online() returns an error, @cdev is
390 * %0 on success and a negative error value on failure.
392 * enabled, ccw device lock not held
394 int ccw_device_set_online(struct ccw_device *cdev)
401 if (cdev->online || !cdev->drv)
403 /* Hold on to an extra reference while device is online. */
404 if (!get_device(&cdev->dev))
407 spin_lock_irq(cdev->ccwlock);
408 ret = ccw_device_online(cdev);
409 spin_unlock_irq(cdev->ccwlock);
411 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
413 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
414 "device 0.%x.%04x\n",
415 ret, cdev->private->dev_id.ssid,
416 cdev->private->dev_id.devno);
417 /* Give up online reference since onlining failed. */
418 put_device(&cdev->dev);
421 spin_lock_irq(cdev->ccwlock);
422 /* Check if online processing was successful */
423 if ((cdev->private->state != DEV_STATE_ONLINE) &&
424 (cdev->private->state != DEV_STATE_W4SENSE)) {
425 spin_unlock_irq(cdev->ccwlock);
426 /* Inform the user that set online failed. */
427 if (cdev->private->state == DEV_STATE_BOXED) {
428 pr_warning("%s: Setting the device online failed "
429 "because it is boxed\n",
430 dev_name(&cdev->dev));
431 } else if (cdev->private->state == DEV_STATE_NOT_OPER) {
432 pr_warning("%s: Setting the device online failed "
433 "because it is not operational\n",
434 dev_name(&cdev->dev));
436 /* Give up online reference since onlining failed. */
437 put_device(&cdev->dev);
440 spin_unlock_irq(cdev->ccwlock);
441 if (cdev->drv->set_online)
442 ret = cdev->drv->set_online(cdev);
449 spin_lock_irq(cdev->ccwlock);
450 /* Wait until a final state or DISCONNECTED is reached */
451 while (!dev_fsm_final_state(cdev) &&
452 cdev->private->state != DEV_STATE_DISCONNECTED) {
453 spin_unlock_irq(cdev->ccwlock);
454 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
455 cdev->private->state == DEV_STATE_DISCONNECTED));
456 spin_lock_irq(cdev->ccwlock);
458 ret2 = ccw_device_offline(cdev);
461 spin_unlock_irq(cdev->ccwlock);
462 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
463 cdev->private->state == DEV_STATE_DISCONNECTED));
464 /* Give up online reference since onlining failed. */
465 put_device(&cdev->dev);
469 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
470 "device 0.%x.%04x\n",
471 ret2, cdev->private->dev_id.ssid,
472 cdev->private->dev_id.devno);
473 cdev->private->state = DEV_STATE_OFFLINE;
474 spin_unlock_irq(cdev->ccwlock);
475 /* Give up online reference since onlining failed. */
476 put_device(&cdev->dev);
480 static int online_store_handle_offline(struct ccw_device *cdev)
482 if (cdev->private->state == DEV_STATE_DISCONNECTED) {
483 spin_lock_irq(cdev->ccwlock);
484 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
485 spin_unlock_irq(cdev->ccwlock);
486 } else if (cdev->online && cdev->drv && cdev->drv->set_offline)
487 return ccw_device_set_offline(cdev);
491 static int online_store_recog_and_online(struct ccw_device *cdev)
493 /* Do device recognition, if needed. */
494 if (cdev->private->state == DEV_STATE_BOXED) {
495 spin_lock_irq(cdev->ccwlock);
496 ccw_device_recognition(cdev);
497 spin_unlock_irq(cdev->ccwlock);
498 wait_event(cdev->private->wait_q,
499 cdev->private->flags.recog_done);
500 if (cdev->private->state != DEV_STATE_OFFLINE)
501 /* recognition failed */
504 if (cdev->drv && cdev->drv->set_online)
505 ccw_device_set_online(cdev);
509 static int online_store_handle_online(struct ccw_device *cdev, int force)
513 ret = online_store_recog_and_online(cdev);
516 if (force && cdev->private->state == DEV_STATE_BOXED) {
517 ret = ccw_device_stlck(cdev);
520 if (cdev->id.cu_type == 0)
521 cdev->private->state = DEV_STATE_NOT_OPER;
522 ret = online_store_recog_and_online(cdev);
529 static ssize_t online_store (struct device *dev, struct device_attribute *attr,
530 const char *buf, size_t count)
532 struct ccw_device *cdev = to_ccwdev(dev);
536 if (!dev_fsm_final_state(cdev) &&
537 cdev->private->state != DEV_STATE_DISCONNECTED)
539 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
542 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
543 atomic_set(&cdev->private->onoff, 0);
546 if (!strncmp(buf, "force\n", count)) {
552 ret = strict_strtoul(buf, 16, &i);
558 ret = online_store_handle_offline(cdev);
561 ret = online_store_handle_online(cdev, force);
568 module_put(cdev->drv->owner);
569 atomic_set(&cdev->private->onoff, 0);
570 return (ret < 0) ? ret : count;
574 available_show (struct device *dev, struct device_attribute *attr, char *buf)
576 struct ccw_device *cdev = to_ccwdev(dev);
577 struct subchannel *sch;
579 if (ccw_device_is_orphan(cdev))
580 return sprintf(buf, "no device\n");
581 switch (cdev->private->state) {
582 case DEV_STATE_BOXED:
583 return sprintf(buf, "boxed\n");
584 case DEV_STATE_DISCONNECTED:
585 case DEV_STATE_DISCONNECTED_SENSE_ID:
586 case DEV_STATE_NOT_OPER:
587 sch = to_subchannel(dev->parent);
589 return sprintf(buf, "no path\n");
591 return sprintf(buf, "no device\n");
593 /* All other states considered fine. */
594 return sprintf(buf, "good\n");
598 static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
599 static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
600 static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
601 static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
602 static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
603 static DEVICE_ATTR(online, 0644, online_show, online_store);
604 static DEVICE_ATTR(availability, 0444, available_show, NULL);
606 static struct attribute *io_subchannel_attrs[] = {
607 &dev_attr_chpids.attr,
608 &dev_attr_pimpampom.attr,
612 static struct attribute_group io_subchannel_attr_group = {
613 .attrs = io_subchannel_attrs,
616 static struct attribute * ccwdev_attrs[] = {
617 &dev_attr_devtype.attr,
618 &dev_attr_cutype.attr,
619 &dev_attr_modalias.attr,
620 &dev_attr_online.attr,
621 &dev_attr_cmb_enable.attr,
622 &dev_attr_availability.attr,
626 static struct attribute_group ccwdev_attr_group = {
627 .attrs = ccwdev_attrs,
630 static const struct attribute_group *ccwdev_attr_groups[] = {
635 /* this is a simple abstraction for device_register that sets the
636 * correct bus type and adds the bus specific files */
637 static int ccw_device_register(struct ccw_device *cdev)
639 struct device *dev = &cdev->dev;
642 dev->bus = &ccw_bus_type;
643 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
644 cdev->private->dev_id.devno);
647 return device_add(dev);
650 static int match_dev_id(struct device *dev, void *data)
652 struct ccw_device *cdev = to_ccwdev(dev);
653 struct ccw_dev_id *dev_id = data;
655 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
658 static struct ccw_device *get_ccwdev_by_dev_id(struct ccw_dev_id *dev_id)
662 dev = bus_find_device(&ccw_bus_type, NULL, dev_id, match_dev_id);
664 return dev ? to_ccwdev(dev) : NULL;
667 static void ccw_device_do_unbind_bind(struct ccw_device *cdev)
671 if (device_is_registered(&cdev->dev)) {
672 device_release_driver(&cdev->dev);
673 ret = device_attach(&cdev->dev);
674 WARN_ON(ret == -ENODEV);
679 ccw_device_release(struct device *dev)
681 struct ccw_device *cdev;
683 cdev = to_ccwdev(dev);
684 /* Release reference of parent subchannel. */
685 put_device(cdev->dev.parent);
686 kfree(cdev->private);
690 static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
692 struct ccw_device *cdev;
694 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
696 cdev->private = kzalloc(sizeof(struct ccw_device_private),
697 GFP_KERNEL | GFP_DMA);
702 return ERR_PTR(-ENOMEM);
705 static void ccw_device_todo(struct work_struct *work);
707 static int io_subchannel_initialize_dev(struct subchannel *sch,
708 struct ccw_device *cdev)
710 cdev->private->cdev = cdev;
711 atomic_set(&cdev->private->onoff, 0);
712 cdev->dev.parent = &sch->dev;
713 cdev->dev.release = ccw_device_release;
714 INIT_WORK(&cdev->private->todo_work, ccw_device_todo);
715 cdev->dev.groups = ccwdev_attr_groups;
716 /* Do first half of device_register. */
717 device_initialize(&cdev->dev);
718 if (!get_device(&sch->dev)) {
719 /* Release reference from device_initialize(). */
720 put_device(&cdev->dev);
723 cdev->private->flags.initialized = 1;
727 static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
729 struct ccw_device *cdev;
732 cdev = io_subchannel_allocate_dev(sch);
734 ret = io_subchannel_initialize_dev(sch, cdev);
741 static void io_subchannel_recog(struct ccw_device *, struct subchannel *);
743 static void sch_create_and_recog_new_device(struct subchannel *sch)
745 struct ccw_device *cdev;
747 /* Need to allocate a new ccw device. */
748 cdev = io_subchannel_create_ccwdev(sch);
750 /* OK, we did everything we could... */
751 css_sch_device_unregister(sch);
754 /* Start recognition for the new ccw device. */
755 io_subchannel_recog(cdev, sch);
759 * Register recognized device.
761 static void io_subchannel_register(struct ccw_device *cdev)
763 struct subchannel *sch;
767 sch = to_subchannel(cdev->dev.parent);
769 * Check if subchannel is still registered. It may have become
770 * unregistered if a machine check hit us after finishing
771 * device recognition but before the register work could be
774 if (!device_is_registered(&sch->dev))
776 css_update_ssd_info(sch);
778 * io_subchannel_register() will also be called after device
779 * recognition has been done for a boxed device (which will already
780 * be registered). We need to reprobe since we may now have sense id
783 if (device_is_registered(&cdev->dev)) {
785 ret = device_reprobe(&cdev->dev);
787 /* We can't do much here. */
788 CIO_MSG_EVENT(0, "device_reprobe() returned"
789 " %d for 0.%x.%04x\n", ret,
790 cdev->private->dev_id.ssid,
791 cdev->private->dev_id.devno);
796 * Now we know this subchannel will stay, we can throw
797 * our delayed uevent.
799 dev_set_uevent_suppress(&sch->dev, 0);
800 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
801 /* make it known to the system */
802 ret = ccw_device_register(cdev);
804 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
805 cdev->private->dev_id.ssid,
806 cdev->private->dev_id.devno, ret);
807 spin_lock_irqsave(sch->lock, flags);
808 sch_set_cdev(sch, NULL);
809 spin_unlock_irqrestore(sch->lock, flags);
810 /* Release initial device reference. */
811 put_device(&cdev->dev);
815 cdev->private->flags.recog_done = 1;
816 wake_up(&cdev->private->wait_q);
818 if (atomic_dec_and_test(&ccw_device_init_count))
819 wake_up(&ccw_device_init_wq);
822 static void ccw_device_call_sch_unregister(struct ccw_device *cdev)
824 struct subchannel *sch;
826 /* Get subchannel reference for local processing. */
827 if (!get_device(cdev->dev.parent))
829 sch = to_subchannel(cdev->dev.parent);
830 css_sch_device_unregister(sch);
831 /* Release subchannel reference for local processing. */
832 put_device(&sch->dev);
836 * subchannel recognition done. Called from the state machine.
839 io_subchannel_recog_done(struct ccw_device *cdev)
841 if (css_init_done == 0) {
842 cdev->private->flags.recog_done = 1;
845 switch (cdev->private->state) {
846 case DEV_STATE_BOXED:
847 /* Device did not respond in time. */
848 case DEV_STATE_NOT_OPER:
849 cdev->private->flags.recog_done = 1;
850 /* Remove device found not operational. */
851 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
852 if (atomic_dec_and_test(&ccw_device_init_count))
853 wake_up(&ccw_device_init_wq);
855 case DEV_STATE_OFFLINE:
857 * We can't register the device in interrupt context so
858 * we schedule a work item.
860 ccw_device_sched_todo(cdev, CDEV_TODO_REGISTER);
865 static void io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
867 struct ccw_device_private *priv;
869 cdev->ccwlock = sch->lock;
871 /* Init private data. */
872 priv = cdev->private;
873 priv->dev_id.devno = sch->schib.pmcw.dev;
874 priv->dev_id.ssid = sch->schid.ssid;
875 priv->schid = sch->schid;
876 priv->state = DEV_STATE_NOT_OPER;
877 INIT_LIST_HEAD(&priv->cmb_list);
878 init_waitqueue_head(&priv->wait_q);
879 init_timer(&priv->timer);
881 /* Increase counter of devices currently in recognition. */
882 atomic_inc(&ccw_device_init_count);
884 /* Start async. device sensing. */
885 spin_lock_irq(sch->lock);
886 sch_set_cdev(sch, cdev);
887 ccw_device_recognition(cdev);
888 spin_unlock_irq(sch->lock);
891 static int ccw_device_move_to_sch(struct ccw_device *cdev,
892 struct subchannel *sch)
894 struct subchannel *old_sch;
895 int rc, old_enabled = 0;
897 old_sch = to_subchannel(cdev->dev.parent);
898 /* Obtain child reference for new parent. */
899 if (!get_device(&sch->dev))
902 if (!sch_is_pseudo_sch(old_sch)) {
903 spin_lock_irq(old_sch->lock);
904 old_enabled = old_sch->schib.pmcw.ena;
907 rc = cio_disable_subchannel(old_sch);
908 spin_unlock_irq(old_sch->lock);
910 /* Release child reference for new parent. */
911 put_device(&sch->dev);
916 mutex_lock(&sch->reg_mutex);
917 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
918 mutex_unlock(&sch->reg_mutex);
920 CIO_MSG_EVENT(0, "device_move(0.%x.%04x,0.%x.%04x)=%d\n",
921 cdev->private->dev_id.ssid,
922 cdev->private->dev_id.devno, sch->schid.ssid,
923 sch->schib.pmcw.dev, rc);
925 /* Try to reenable the old subchannel. */
926 spin_lock_irq(old_sch->lock);
927 cio_enable_subchannel(old_sch, (u32)(addr_t)old_sch);
928 spin_unlock_irq(old_sch->lock);
930 /* Release child reference for new parent. */
931 put_device(&sch->dev);
934 /* Clean up old subchannel. */
935 if (!sch_is_pseudo_sch(old_sch)) {
936 spin_lock_irq(old_sch->lock);
937 sch_set_cdev(old_sch, NULL);
938 spin_unlock_irq(old_sch->lock);
939 css_schedule_eval(old_sch->schid);
941 /* Release child reference for old parent. */
942 put_device(&old_sch->dev);
943 /* Initialize new subchannel. */
944 spin_lock_irq(sch->lock);
945 cdev->private->schid = sch->schid;
946 cdev->ccwlock = sch->lock;
947 if (!sch_is_pseudo_sch(sch))
948 sch_set_cdev(sch, cdev);
949 spin_unlock_irq(sch->lock);
950 if (!sch_is_pseudo_sch(sch))
951 css_update_ssd_info(sch);
955 static int ccw_device_move_to_orph(struct ccw_device *cdev)
957 struct subchannel *sch = to_subchannel(cdev->dev.parent);
958 struct channel_subsystem *css = to_css(sch->dev.parent);
960 return ccw_device_move_to_sch(cdev, css->pseudo_subchannel);
963 static void io_subchannel_irq(struct subchannel *sch)
965 struct ccw_device *cdev;
967 cdev = sch_get_cdev(sch);
969 CIO_TRACE_EVENT(6, "IRQ");
970 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
972 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
975 void io_subchannel_init_config(struct subchannel *sch)
977 memset(&sch->config, 0, sizeof(sch->config));
978 sch->config.csense = 1;
981 static void io_subchannel_init_fields(struct subchannel *sch)
983 if (cio_is_console(sch->schid))
986 sch->opm = chp_get_sch_opm(sch);
987 sch->lpm = sch->schib.pmcw.pam & sch->opm;
988 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
990 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
991 " - PIM = %02X, PAM = %02X, POM = %02X\n",
992 sch->schib.pmcw.dev, sch->schid.ssid,
993 sch->schid.sch_no, sch->schib.pmcw.pim,
994 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
996 io_subchannel_init_config(sch);
1000 * Note: We always return 0 so that we bind to the device even on error.
1001 * This is needed so that our remove function is called on unregister.
1003 static int io_subchannel_probe(struct subchannel *sch)
1005 struct ccw_device *cdev;
1008 if (cio_is_console(sch->schid)) {
1009 rc = sysfs_create_group(&sch->dev.kobj,
1010 &io_subchannel_attr_group);
1012 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1013 "attributes for subchannel "
1014 "0.%x.%04x (rc=%d)\n",
1015 sch->schid.ssid, sch->schid.sch_no, rc);
1017 * The console subchannel already has an associated ccw_device.
1018 * Throw the delayed uevent for the subchannel, register
1019 * the ccw_device and exit.
1021 dev_set_uevent_suppress(&sch->dev, 0);
1022 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1023 cdev = sch_get_cdev(sch);
1024 cdev->dev.groups = ccwdev_attr_groups;
1025 device_initialize(&cdev->dev);
1026 cdev->private->flags.initialized = 1;
1027 ccw_device_register(cdev);
1029 * Check if the device is already online. If it is
1030 * the reference count needs to be corrected since we
1031 * didn't obtain a reference in ccw_device_set_online.
1033 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1034 cdev->private->state != DEV_STATE_OFFLINE &&
1035 cdev->private->state != DEV_STATE_BOXED)
1036 get_device(&cdev->dev);
1039 io_subchannel_init_fields(sch);
1040 rc = cio_commit_config(sch);
1043 rc = sysfs_create_group(&sch->dev.kobj,
1044 &io_subchannel_attr_group);
1047 /* Allocate I/O subchannel private data. */
1048 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1049 GFP_KERNEL | GFP_DMA);
1052 css_schedule_eval(sch->schid);
1056 spin_lock_irq(sch->lock);
1057 css_sched_sch_todo(sch, SCH_TODO_UNREG);
1058 spin_unlock_irq(sch->lock);
1062 static void io_subchannel_quiesce(struct subchannel *);
1065 io_subchannel_remove (struct subchannel *sch)
1067 struct ccw_device *cdev;
1068 unsigned long flags;
1070 cdev = sch_get_cdev(sch);
1073 io_subchannel_quiesce(sch);
1074 /* Set ccw device to not operational and drop reference. */
1075 spin_lock_irqsave(cdev->ccwlock, flags);
1076 sch_set_cdev(sch, NULL);
1077 cdev->private->state = DEV_STATE_NOT_OPER;
1078 spin_unlock_irqrestore(cdev->ccwlock, flags);
1079 ccw_device_unregister(cdev);
1081 kfree(sch->private);
1082 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
1086 static void io_subchannel_verify(struct subchannel *sch)
1088 struct ccw_device *cdev;
1090 cdev = sch_get_cdev(sch);
1092 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1095 static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
1097 struct ccw_device *cdev;
1099 cdev = sch_get_cdev(sch);
1102 if (cio_update_schib(sch))
1104 /* Check for I/O on path. */
1105 if (scsw_actl(&sch->schib.scsw) == 0 || sch->schib.pmcw.lpum != mask)
1107 if (cdev->private->state == DEV_STATE_ONLINE) {
1108 ccw_device_kill_io(cdev);
1114 /* Trigger path verification. */
1115 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1119 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
1122 static int io_subchannel_chp_event(struct subchannel *sch,
1123 struct chp_link *link, int event)
1127 mask = chp_ssd_get_mask(&sch->ssd_info, link);
1134 io_subchannel_terminate_path(sch, mask);
1139 io_subchannel_verify(sch);
1142 if (cio_update_schib(sch))
1144 io_subchannel_terminate_path(sch, mask);
1147 if (cio_update_schib(sch))
1149 sch->lpm |= mask & sch->opm;
1150 io_subchannel_verify(sch);
1156 static void io_subchannel_quiesce(struct subchannel *sch)
1158 struct ccw_device *cdev;
1161 spin_lock_irq(sch->lock);
1162 cdev = sch_get_cdev(sch);
1163 if (cio_is_console(sch->schid))
1165 if (!sch->schib.pmcw.ena)
1167 ret = cio_disable_subchannel(sch);
1171 cdev->handler(cdev, cdev->private->intparm, ERR_PTR(-EIO));
1172 while (ret == -EBUSY) {
1173 cdev->private->state = DEV_STATE_QUIESCE;
1174 ret = ccw_device_cancel_halt_clear(cdev);
1175 if (ret == -EBUSY) {
1176 ccw_device_set_timeout(cdev, HZ/10);
1177 spin_unlock_irq(sch->lock);
1178 wait_event(cdev->private->wait_q,
1179 cdev->private->state != DEV_STATE_QUIESCE);
1180 spin_lock_irq(sch->lock);
1182 ret = cio_disable_subchannel(sch);
1185 spin_unlock_irq(sch->lock);
1188 static void io_subchannel_shutdown(struct subchannel *sch)
1190 io_subchannel_quiesce(sch);
1193 static int device_is_disconnected(struct ccw_device *cdev)
1197 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1198 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1201 static int recovery_check(struct device *dev, void *data)
1203 struct ccw_device *cdev = to_ccwdev(dev);
1206 spin_lock_irq(cdev->ccwlock);
1207 switch (cdev->private->state) {
1208 case DEV_STATE_DISCONNECTED:
1209 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1210 cdev->private->dev_id.ssid,
1211 cdev->private->dev_id.devno);
1212 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1215 case DEV_STATE_DISCONNECTED_SENSE_ID:
1219 spin_unlock_irq(cdev->ccwlock);
1224 static void recovery_work_func(struct work_struct *unused)
1228 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1230 spin_lock_irq(&recovery_lock);
1231 if (!timer_pending(&recovery_timer)) {
1232 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1234 mod_timer(&recovery_timer, jiffies +
1235 recovery_delay[recovery_phase] * HZ);
1237 spin_unlock_irq(&recovery_lock);
1239 CIO_MSG_EVENT(4, "recovery: end\n");
1242 static DECLARE_WORK(recovery_work, recovery_work_func);
1244 static void recovery_func(unsigned long data)
1247 * We can't do our recovery in softirq context and it's not
1248 * performance critical, so we schedule it.
1250 schedule_work(&recovery_work);
1253 static void ccw_device_schedule_recovery(void)
1255 unsigned long flags;
1257 CIO_MSG_EVENT(4, "recovery: schedule\n");
1258 spin_lock_irqsave(&recovery_lock, flags);
1259 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1261 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1263 spin_unlock_irqrestore(&recovery_lock, flags);
1266 static int purge_fn(struct device *dev, void *data)
1268 struct ccw_device *cdev = to_ccwdev(dev);
1269 struct ccw_dev_id *id = &cdev->private->dev_id;
1271 spin_lock_irq(cdev->ccwlock);
1272 if (is_blacklisted(id->ssid, id->devno) &&
1273 (cdev->private->state == DEV_STATE_OFFLINE)) {
1274 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", id->ssid,
1276 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1278 spin_unlock_irq(cdev->ccwlock);
1279 /* Abort loop in case of pending signal. */
1280 if (signal_pending(current))
1287 * ccw_purge_blacklisted - purge unused, blacklisted devices
1289 * Unregister all ccw devices that are offline and on the blacklist.
1291 int ccw_purge_blacklisted(void)
1293 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1294 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1298 void ccw_device_set_disconnected(struct ccw_device *cdev)
1302 ccw_device_set_timeout(cdev, 0);
1303 cdev->private->flags.fake_irb = 0;
1304 cdev->private->state = DEV_STATE_DISCONNECTED;
1306 ccw_device_schedule_recovery();
1309 void ccw_device_set_notoper(struct ccw_device *cdev)
1311 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1313 CIO_TRACE_EVENT(2, "notoper");
1314 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
1315 ccw_device_set_timeout(cdev, 0);
1316 cio_disable_subchannel(sch);
1317 cdev->private->state = DEV_STATE_NOT_OPER;
1320 enum io_sch_action {
1324 IO_SCH_UNREG_ATTACH,
1332 static enum io_sch_action sch_get_action(struct subchannel *sch)
1334 struct ccw_device *cdev;
1336 cdev = sch_get_cdev(sch);
1337 if (cio_update_schib(sch)) {
1338 /* Not operational. */
1340 return IO_SCH_UNREG;
1341 if (!ccw_device_notify(cdev, CIO_GONE))
1342 return IO_SCH_UNREG;
1343 return IO_SCH_ORPH_UNREG;
1347 return IO_SCH_ATTACH;
1348 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1349 if (!ccw_device_notify(cdev, CIO_GONE))
1350 return IO_SCH_UNREG_ATTACH;
1351 return IO_SCH_ORPH_ATTACH;
1353 if ((sch->schib.pmcw.pam & sch->opm) == 0) {
1354 if (!ccw_device_notify(cdev, CIO_NO_PATH))
1355 return IO_SCH_UNREG;
1358 if (device_is_disconnected(cdev))
1359 return IO_SCH_REPROBE;
1361 return IO_SCH_VERIFY;
1366 * io_subchannel_sch_event - process subchannel event
1368 * @process: non-zero if function is called in process context
1370 * An unspecified event occurred for this subchannel. Adjust data according
1371 * to the current operational state of the subchannel and device. Return
1372 * zero when the event has been handled sufficiently or -EAGAIN when this
1373 * function should be called again in process context.
1375 static int io_subchannel_sch_event(struct subchannel *sch, int process)
1377 unsigned long flags;
1378 struct ccw_device *cdev;
1379 struct ccw_dev_id dev_id;
1380 enum io_sch_action action;
1383 spin_lock_irqsave(sch->lock, flags);
1384 if (!device_is_registered(&sch->dev))
1386 if (work_pending(&sch->todo_work))
1388 cdev = sch_get_cdev(sch);
1389 if (cdev && work_pending(&cdev->private->todo_work))
1391 action = sch_get_action(sch);
1392 CIO_MSG_EVENT(2, "event: sch 0.%x.%04x, process=%d, action=%d\n",
1393 sch->schid.ssid, sch->schid.sch_no, process,
1395 /* Perform immediate actions while holding the lock. */
1397 case IO_SCH_REPROBE:
1398 /* Trigger device recognition. */
1399 ccw_device_trigger_reprobe(cdev);
1403 /* Trigger path verification. */
1404 io_subchannel_verify(sch);
1408 ccw_device_set_disconnected(cdev);
1411 case IO_SCH_ORPH_UNREG:
1412 case IO_SCH_ORPH_ATTACH:
1413 ccw_device_set_disconnected(cdev);
1415 case IO_SCH_UNREG_ATTACH:
1418 ccw_device_set_notoper(cdev);
1426 spin_unlock_irqrestore(sch->lock, flags);
1427 /* All other actions require process context. */
1430 /* Handle attached ccw device. */
1432 case IO_SCH_ORPH_UNREG:
1433 case IO_SCH_ORPH_ATTACH:
1434 /* Move ccw device to orphanage. */
1435 rc = ccw_device_move_to_orph(cdev);
1439 case IO_SCH_UNREG_ATTACH:
1440 /* Unregister ccw device. */
1441 ccw_device_unregister(cdev);
1446 /* Handle subchannel. */
1448 case IO_SCH_ORPH_UNREG:
1450 css_sch_device_unregister(sch);
1452 case IO_SCH_ORPH_ATTACH:
1453 case IO_SCH_UNREG_ATTACH:
1455 dev_id.ssid = sch->schid.ssid;
1456 dev_id.devno = sch->schib.pmcw.dev;
1457 cdev = get_ccwdev_by_dev_id(&dev_id);
1459 sch_create_and_recog_new_device(sch);
1462 rc = ccw_device_move_to_sch(cdev, sch);
1464 /* Release reference from get_ccwdev_by_dev_id() */
1465 put_device(&cdev->dev);
1468 spin_lock_irqsave(sch->lock, flags);
1469 ccw_device_trigger_reprobe(cdev);
1470 spin_unlock_irqrestore(sch->lock, flags);
1471 /* Release reference from get_ccwdev_by_dev_id() */
1472 put_device(&cdev->dev);
1480 spin_unlock_irqrestore(sch->lock, flags);
1485 #ifdef CONFIG_CCW_CONSOLE
1486 static struct ccw_device console_cdev;
1487 static struct ccw_device_private console_private;
1488 static int console_cdev_in_use;
1490 static DEFINE_SPINLOCK(ccw_console_lock);
1492 spinlock_t * cio_get_console_lock(void)
1494 return &ccw_console_lock;
1497 static int ccw_device_console_enable(struct ccw_device *cdev,
1498 struct subchannel *sch)
1502 /* Attach subchannel private data. */
1503 sch->private = cio_get_console_priv();
1504 memset(sch->private, 0, sizeof(struct io_subchannel_private));
1505 io_subchannel_init_fields(sch);
1506 rc = cio_commit_config(sch);
1509 sch->driver = &io_subchannel_driver;
1510 /* Initialize the ccw_device structure. */
1511 cdev->dev.parent= &sch->dev;
1512 io_subchannel_recog(cdev, sch);
1513 /* Now wait for the async. recognition to come to an end. */
1514 spin_lock_irq(cdev->ccwlock);
1515 while (!dev_fsm_final_state(cdev))
1518 if (cdev->private->state != DEV_STATE_OFFLINE)
1520 ccw_device_online(cdev);
1521 while (!dev_fsm_final_state(cdev))
1523 if (cdev->private->state != DEV_STATE_ONLINE)
1527 spin_unlock_irq(cdev->ccwlock);
1532 ccw_device_probe_console(void)
1534 struct subchannel *sch;
1537 if (xchg(&console_cdev_in_use, 1) != 0)
1538 return ERR_PTR(-EBUSY);
1539 sch = cio_probe_console();
1541 console_cdev_in_use = 0;
1542 return (void *) sch;
1544 memset(&console_cdev, 0, sizeof(struct ccw_device));
1545 memset(&console_private, 0, sizeof(struct ccw_device_private));
1546 console_cdev.private = &console_private;
1547 console_private.cdev = &console_cdev;
1548 ret = ccw_device_console_enable(&console_cdev, sch);
1550 cio_release_console();
1551 console_cdev_in_use = 0;
1552 return ERR_PTR(ret);
1554 console_cdev.online = 1;
1555 return &console_cdev;
1558 static int ccw_device_pm_restore(struct device *dev);
1560 int ccw_device_force_console(void)
1562 if (!console_cdev_in_use)
1564 return ccw_device_pm_restore(&console_cdev.dev);
1566 EXPORT_SYMBOL_GPL(ccw_device_force_console);
1570 * get ccw_device matching the busid, but only if owned by cdrv
1573 __ccwdev_check_busid(struct device *dev, void *id)
1579 return (strcmp(bus_id, dev_name(dev)) == 0);
1584 * get_ccwdev_by_busid() - obtain device from a bus id
1585 * @cdrv: driver the device is owned by
1586 * @bus_id: bus id of the device to be searched
1588 * This function searches all devices owned by @cdrv for a device with a bus
1589 * id matching @bus_id.
1591 * If a match is found, its reference count of the found device is increased
1592 * and it is returned; else %NULL is returned.
1594 struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1598 struct device_driver *drv;
1600 drv = get_driver(&cdrv->driver);
1604 dev = driver_find_device(drv, NULL, (void *)bus_id,
1605 __ccwdev_check_busid);
1608 return dev ? to_ccwdev(dev) : NULL;
1611 /************************** device driver handling ************************/
1613 /* This is the implementation of the ccw_driver class. The probe, remove
1614 * and release methods are initially very similar to the device_driver
1615 * implementations, with the difference that they have ccw_device
1618 * A ccw driver also contains the information that is needed for
1622 ccw_device_probe (struct device *dev)
1624 struct ccw_device *cdev = to_ccwdev(dev);
1625 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1628 cdev->drv = cdrv; /* to let the driver call _set_online */
1630 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1641 ccw_device_remove (struct device *dev)
1643 struct ccw_device *cdev = to_ccwdev(dev);
1644 struct ccw_driver *cdrv = cdev->drv;
1651 spin_lock_irq(cdev->ccwlock);
1652 ret = ccw_device_offline(cdev);
1653 spin_unlock_irq(cdev->ccwlock);
1655 wait_event(cdev->private->wait_q,
1656 dev_fsm_final_state(cdev));
1658 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
1659 "device 0.%x.%04x\n",
1660 ret, cdev->private->dev_id.ssid,
1661 cdev->private->dev_id.devno);
1662 /* Give up reference obtained in ccw_device_set_online(). */
1663 put_device(&cdev->dev);
1665 ccw_device_set_timeout(cdev, 0);
1670 static void ccw_device_shutdown(struct device *dev)
1672 struct ccw_device *cdev;
1674 cdev = to_ccwdev(dev);
1675 if (cdev->drv && cdev->drv->shutdown)
1676 cdev->drv->shutdown(cdev);
1680 static int ccw_device_pm_prepare(struct device *dev)
1682 struct ccw_device *cdev = to_ccwdev(dev);
1684 if (work_pending(&cdev->private->todo_work))
1686 /* Fail while device is being set online/offline. */
1687 if (atomic_read(&cdev->private->onoff))
1690 if (cdev->online && cdev->drv && cdev->drv->prepare)
1691 return cdev->drv->prepare(cdev);
1696 static void ccw_device_pm_complete(struct device *dev)
1698 struct ccw_device *cdev = to_ccwdev(dev);
1700 if (cdev->online && cdev->drv && cdev->drv->complete)
1701 cdev->drv->complete(cdev);
1704 static int ccw_device_pm_freeze(struct device *dev)
1706 struct ccw_device *cdev = to_ccwdev(dev);
1707 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1708 int ret, cm_enabled;
1710 /* Fail suspend while device is in transistional state. */
1711 if (!dev_fsm_final_state(cdev))
1715 if (cdev->drv && cdev->drv->freeze) {
1716 ret = cdev->drv->freeze(cdev);
1721 spin_lock_irq(sch->lock);
1722 cm_enabled = cdev->private->cmb != NULL;
1723 spin_unlock_irq(sch->lock);
1725 /* Don't have the css write on memory. */
1726 ret = ccw_set_cmf(cdev, 0);
1730 /* From here on, disallow device driver I/O. */
1731 spin_lock_irq(sch->lock);
1732 ret = cio_disable_subchannel(sch);
1733 spin_unlock_irq(sch->lock);
1738 static int ccw_device_pm_thaw(struct device *dev)
1740 struct ccw_device *cdev = to_ccwdev(dev);
1741 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1742 int ret, cm_enabled;
1747 spin_lock_irq(sch->lock);
1748 /* Allow device driver I/O again. */
1749 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1750 cm_enabled = cdev->private->cmb != NULL;
1751 spin_unlock_irq(sch->lock);
1756 ret = ccw_set_cmf(cdev, 1);
1761 if (cdev->drv && cdev->drv->thaw)
1762 ret = cdev->drv->thaw(cdev);
1767 static void __ccw_device_pm_restore(struct ccw_device *cdev)
1769 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1771 if (cio_is_console(sch->schid))
1774 * While we were sleeping, devices may have gone or become
1775 * available again. Kick re-detection.
1777 spin_lock_irq(sch->lock);
1778 cdev->private->flags.resuming = 1;
1779 ccw_device_recognition(cdev);
1780 spin_unlock_irq(sch->lock);
1781 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
1782 cdev->private->state == DEV_STATE_DISCONNECTED);
1784 cdev->private->flags.resuming = 0;
1787 static int resume_handle_boxed(struct ccw_device *cdev)
1789 cdev->private->state = DEV_STATE_BOXED;
1790 if (ccw_device_notify(cdev, CIO_BOXED))
1792 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1796 static int resume_handle_disc(struct ccw_device *cdev)
1798 cdev->private->state = DEV_STATE_DISCONNECTED;
1799 if (ccw_device_notify(cdev, CIO_GONE))
1801 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG);
1805 static int ccw_device_pm_restore(struct device *dev)
1807 struct ccw_device *cdev = to_ccwdev(dev);
1808 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1809 int ret = 0, cm_enabled;
1811 __ccw_device_pm_restore(cdev);
1812 spin_lock_irq(sch->lock);
1813 if (cio_is_console(sch->schid)) {
1814 cio_enable_subchannel(sch, (u32)(addr_t)sch);
1815 spin_unlock_irq(sch->lock);
1818 cdev->private->flags.donotify = 0;
1819 /* check recognition results */
1820 switch (cdev->private->state) {
1821 case DEV_STATE_OFFLINE:
1823 case DEV_STATE_BOXED:
1824 ret = resume_handle_boxed(cdev);
1825 spin_unlock_irq(sch->lock);
1829 case DEV_STATE_DISCONNECTED:
1830 goto out_disc_unlock;
1832 goto out_unreg_unlock;
1834 /* check if the device id has changed */
1835 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
1836 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
1837 "changed from %04x to %04x)\n",
1838 sch->schid.ssid, sch->schid.sch_no,
1839 cdev->private->dev_id.devno,
1840 sch->schib.pmcw.dev);
1841 goto out_unreg_unlock;
1843 /* check if the device type has changed */
1844 if (!ccw_device_test_sense_data(cdev)) {
1845 ccw_device_update_sense_data(cdev);
1846 ccw_device_sched_todo(cdev, CDEV_TODO_REBIND);
1850 if (!cdev->online) {
1854 ret = ccw_device_online(cdev);
1856 goto out_disc_unlock;
1858 cm_enabled = cdev->private->cmb != NULL;
1859 spin_unlock_irq(sch->lock);
1861 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1862 if (cdev->private->state != DEV_STATE_ONLINE) {
1863 spin_lock_irq(sch->lock);
1864 goto out_disc_unlock;
1867 ret = ccw_set_cmf(cdev, 1);
1869 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
1870 "(rc=%d)\n", cdev->private->dev_id.ssid,
1871 cdev->private->dev_id.devno, ret);
1877 if (cdev->online && cdev->drv && cdev->drv->restore)
1878 ret = cdev->drv->restore(cdev);
1883 ret = resume_handle_disc(cdev);
1884 spin_unlock_irq(sch->lock);
1890 ccw_device_sched_todo(cdev, CDEV_TODO_UNREG_EVAL);
1893 spin_unlock_irq(sch->lock);
1897 static struct dev_pm_ops ccw_pm_ops = {
1898 .prepare = ccw_device_pm_prepare,
1899 .complete = ccw_device_pm_complete,
1900 .freeze = ccw_device_pm_freeze,
1901 .thaw = ccw_device_pm_thaw,
1902 .restore = ccw_device_pm_restore,
1905 struct bus_type ccw_bus_type = {
1907 .match = ccw_bus_match,
1908 .uevent = ccw_uevent,
1909 .probe = ccw_device_probe,
1910 .remove = ccw_device_remove,
1911 .shutdown = ccw_device_shutdown,
1916 * ccw_driver_register() - register a ccw driver
1917 * @cdriver: driver to be registered
1919 * This function is mainly a wrapper around driver_register().
1921 * %0 on success and a negative error value on failure.
1923 int ccw_driver_register(struct ccw_driver *cdriver)
1925 struct device_driver *drv = &cdriver->driver;
1927 drv->bus = &ccw_bus_type;
1928 drv->name = cdriver->name;
1929 drv->owner = cdriver->owner;
1931 return driver_register(drv);
1935 * ccw_driver_unregister() - deregister a ccw driver
1936 * @cdriver: driver to be deregistered
1938 * This function is mainly a wrapper around driver_unregister().
1940 void ccw_driver_unregister(struct ccw_driver *cdriver)
1942 driver_unregister(&cdriver->driver);
1945 /* Helper func for qdio. */
1946 struct subchannel_id
1947 ccw_device_get_subchannel_id(struct ccw_device *cdev)
1949 struct subchannel *sch;
1951 sch = to_subchannel(cdev->dev.parent);
1955 static void ccw_device_todo(struct work_struct *work)
1957 struct ccw_device_private *priv;
1958 struct ccw_device *cdev;
1959 struct subchannel *sch;
1960 enum cdev_todo todo;
1962 priv = container_of(work, struct ccw_device_private, todo_work);
1964 sch = to_subchannel(cdev->dev.parent);
1965 /* Find out todo. */
1966 spin_lock_irq(cdev->ccwlock);
1968 priv->todo = CDEV_TODO_NOTHING;
1969 CIO_MSG_EVENT(4, "cdev_todo: cdev=0.%x.%04x todo=%d\n",
1970 priv->dev_id.ssid, priv->dev_id.devno, todo);
1971 spin_unlock_irq(cdev->ccwlock);
1974 case CDEV_TODO_ENABLE_CMF:
1977 case CDEV_TODO_REBIND:
1978 ccw_device_do_unbind_bind(cdev);
1980 case CDEV_TODO_REGISTER:
1981 io_subchannel_register(cdev);
1983 case CDEV_TODO_UNREG_EVAL:
1984 if (!sch_is_pseudo_sch(sch))
1985 css_schedule_eval(sch->schid);
1987 case CDEV_TODO_UNREG:
1988 if (sch_is_pseudo_sch(sch))
1989 ccw_device_unregister(cdev);
1991 ccw_device_call_sch_unregister(cdev);
1996 /* Release workqueue ref. */
1997 put_device(&cdev->dev);
2001 * ccw_device_sched_todo - schedule ccw device operation
2005 * Schedule the operation identified by @todo to be performed on the slow path
2006 * workqueue. Do nothing if another operation with higher priority is already
2007 * scheduled. Needs to be called with ccwdev lock held.
2009 void ccw_device_sched_todo(struct ccw_device *cdev, enum cdev_todo todo)
2011 CIO_MSG_EVENT(4, "cdev_todo: sched cdev=0.%x.%04x todo=%d\n",
2012 cdev->private->dev_id.ssid, cdev->private->dev_id.devno,
2014 if (cdev->private->todo >= todo)
2016 cdev->private->todo = todo;
2017 /* Get workqueue ref. */
2018 if (!get_device(&cdev->dev))
2020 if (!queue_work(slow_path_wq, &cdev->private->todo_work)) {
2021 /* Already queued, release workqueue ref. */
2022 put_device(&cdev->dev);
2026 MODULE_LICENSE("GPL");
2027 EXPORT_SYMBOL(ccw_device_set_online);
2028 EXPORT_SYMBOL(ccw_device_set_offline);
2029 EXPORT_SYMBOL(ccw_driver_register);
2030 EXPORT_SYMBOL(ccw_driver_unregister);
2031 EXPORT_SYMBOL(get_ccwdev_by_busid);
2032 EXPORT_SYMBOL(ccw_bus_type);
2033 EXPORT_SYMBOL(ccw_device_work);
2034 EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);