blob: 688945662c151e16abbc65074dba3b6ed0ac06c8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/s390/cio/device.c
3 * bus driver for ccw devices
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
7 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
Cornelia Huck4ce3b302006-01-14 13:21:04 -08008 * Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/spinlock.h>
14#include <linux/errno.h>
15#include <linux/err.h>
16#include <linux/slab.h>
17#include <linux/list.h>
18#include <linux/device.h>
19#include <linux/workqueue.h>
20
21#include <asm/ccwdev.h>
22#include <asm/cio.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080023#include <asm/param.h> /* HZ */
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
25#include "cio.h"
26#include "css.h"
27#include "device.h"
28#include "ioasm.h"
29
30/******************* bus type handling ***********************/
31
32/* The Linux driver model distinguishes between a bus type and
33 * the bus itself. Of course we only have one channel
34 * subsystem driver and one channel system per machine, but
35 * we still use the abstraction. T.R. says it's a good idea. */
36static int
37ccw_bus_match (struct device * dev, struct device_driver * drv)
38{
39 struct ccw_device *cdev = to_ccwdev(dev);
40 struct ccw_driver *cdrv = to_ccwdrv(drv);
41 const struct ccw_device_id *ids = cdrv->ids, *found;
42
43 if (!ids)
44 return 0;
45
46 found = ccw_device_id_match(ids, &cdev->id);
47 if (!found)
48 return 0;
49
50 cdev->id.driver_info = found->driver_info;
51
52 return 1;
53}
54
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020055/* Store modalias string delimited by prefix/suffix string into buffer with
56 * specified size. Return length of resulting string (excluding trailing '\0')
57 * even if string doesn't fit buffer (snprintf semantics). */
58static int snprint_alias(char *buf, size_t size, const char *prefix,
59 struct ccw_device_id *id, const char *suffix)
60{
61 int len;
62
63 len = snprintf(buf, size, "%sccw:t%04Xm%02X", prefix, id->cu_type,
64 id->cu_model);
65 if (len > size)
66 return len;
67 buf += len;
68 size -= len;
69
70 if (id->dev_type != 0)
71 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
72 id->dev_model, suffix);
73 else
74 len += snprintf(buf, size, "dtdm%s", suffix);
75
76 return len;
77}
78
79/* Set up environment variables for ccw device uevent. Return 0 on success,
80 * non-zero otherwise. */
81static int ccw_uevent(struct device *dev, char **envp, int num_envp,
82 char *buffer, int buffer_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 struct ccw_device *cdev = to_ccwdev(dev);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020085 struct ccw_device_id *id = &(cdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 int i = 0;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020087 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020089 /* CU_TYPE= */
90 len = snprintf(buffer, buffer_size, "CU_TYPE=%04X", id->cu_type) + 1;
91 if (len > buffer_size || i >= num_envp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 envp[i++] = buffer;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020094 buffer += len;
95 buffer_size -= len;
96
97 /* CU_MODEL= */
98 len = snprintf(buffer, buffer_size, "CU_MODEL=%02X", id->cu_model) + 1;
99 if (len > buffer_size || i >= num_envp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return -ENOMEM;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200101 envp[i++] = buffer;
102 buffer += len;
103 buffer_size -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 /* The next two can be zero, that's ok for us */
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200106 /* DEV_TYPE= */
107 len = snprintf(buffer, buffer_size, "DEV_TYPE=%04X", id->dev_type) + 1;
108 if (len > buffer_size || i >= num_envp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return -ENOMEM;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200110 envp[i++] = buffer;
111 buffer += len;
112 buffer_size -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200114 /* DEV_MODEL= */
115 len = snprintf(buffer, buffer_size, "DEV_MODEL=%02X",
116 (unsigned char) id->dev_model) + 1;
117 if (len > buffer_size || i >= num_envp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return -ENOMEM;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200119 envp[i++] = buffer;
120 buffer += len;
121 buffer_size -= len;
122
123 /* MODALIAS= */
124 len = snprint_alias(buffer, buffer_size, "MODALIAS=", id, "") + 1;
125 if (len > buffer_size || i >= num_envp)
126 return -ENOMEM;
127 envp[i++] = buffer;
128 buffer += len;
129 buffer_size -= len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Heiko Carstensd2c993d2006-07-12 16:41:55 +0200131 envp[i] = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133 return 0;
134}
135
Cornelia Huck8bbace72006-01-11 10:56:22 +0100136struct bus_type ccw_bus_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
Cornelia Huck8bbace72006-01-11 10:56:22 +0100138static int io_subchannel_probe (struct subchannel *);
139static int io_subchannel_remove (struct subchannel *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140void io_subchannel_irq (struct device *);
141static int io_subchannel_notify(struct device *, int);
142static void io_subchannel_verify(struct device *);
143static void io_subchannel_ioterm(struct device *);
Cornelia Huck8bbace72006-01-11 10:56:22 +0100144static void io_subchannel_shutdown(struct subchannel *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146struct css_driver io_subchannel_driver = {
147 .subchannel_type = SUBCHANNEL_TYPE_IO,
148 .drv = {
149 .name = "io_subchannel",
150 .bus = &css_bus_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 },
152 .irq = io_subchannel_irq,
153 .notify = io_subchannel_notify,
154 .verify = io_subchannel_verify,
155 .termination = io_subchannel_ioterm,
Cornelia Huck8bbace72006-01-11 10:56:22 +0100156 .probe = io_subchannel_probe,
157 .remove = io_subchannel_remove,
158 .shutdown = io_subchannel_shutdown,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159};
160
161struct workqueue_struct *ccw_device_work;
162struct workqueue_struct *ccw_device_notify_work;
Peter Oberparleiter40154b82006-06-29 14:57:03 +0200163wait_queue_head_t ccw_device_init_wq;
164atomic_t ccw_device_init_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166static int __init
167init_ccw_bus_type (void)
168{
169 int ret;
170
171 init_waitqueue_head(&ccw_device_init_wq);
172 atomic_set(&ccw_device_init_count, 0);
173
174 ccw_device_work = create_singlethread_workqueue("cio");
175 if (!ccw_device_work)
176 return -ENOMEM; /* FIXME: better errno ? */
177 ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
178 if (!ccw_device_notify_work) {
179 ret = -ENOMEM; /* FIXME: better errno ? */
180 goto out_err;
181 }
182 slow_path_wq = create_singlethread_workqueue("kslowcrw");
183 if (!slow_path_wq) {
184 ret = -ENOMEM; /* FIXME: better errno ? */
185 goto out_err;
186 }
187 if ((ret = bus_register (&ccw_bus_type)))
188 goto out_err;
189
190 if ((ret = driver_register(&io_subchannel_driver.drv)))
191 goto out_err;
192
193 wait_event(ccw_device_init_wq,
194 atomic_read(&ccw_device_init_count) == 0);
195 flush_workqueue(ccw_device_work);
196 return 0;
197out_err:
198 if (ccw_device_work)
199 destroy_workqueue(ccw_device_work);
200 if (ccw_device_notify_work)
201 destroy_workqueue(ccw_device_notify_work);
202 if (slow_path_wq)
203 destroy_workqueue(slow_path_wq);
204 return ret;
205}
206
207static void __exit
208cleanup_ccw_bus_type (void)
209{
210 driver_unregister(&io_subchannel_driver.drv);
211 bus_unregister(&ccw_bus_type);
212 destroy_workqueue(ccw_device_notify_work);
213 destroy_workqueue(ccw_device_work);
214}
215
216subsys_initcall(init_ccw_bus_type);
217module_exit(cleanup_ccw_bus_type);
218
219/************************ device handling **************************/
220
221/*
222 * A ccw_device has some interfaces in sysfs in addition to the
223 * standard ones.
224 * The following entries are designed to export the information which
225 * resided in 2.4 in /proc/subchannels. Subchannel and device number
226 * are obvious, so they don't have an entry :)
227 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
228 */
229static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400230chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231{
232 struct subchannel *sch = to_subchannel(dev);
233 struct ssd_info *ssd = &sch->ssd_info;
234 ssize_t ret = 0;
235 int chp;
236
237 for (chp = 0; chp < 8; chp++)
238 ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
239
240 ret += sprintf (buf+ret, "\n");
241 return min((ssize_t)PAGE_SIZE, ret);
242}
243
244static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400245pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246{
247 struct subchannel *sch = to_subchannel(dev);
248 struct pmcw *pmcw = &sch->schib.pmcw;
249
250 return sprintf (buf, "%02x %02x %02x\n",
251 pmcw->pim, pmcw->pam, pmcw->pom);
252}
253
254static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400255devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 struct ccw_device *cdev = to_ccwdev(dev);
258 struct ccw_device_id *id = &(cdev->id);
259
260 if (id->dev_type != 0)
261 return sprintf(buf, "%04x/%02x\n",
262 id->dev_type, id->dev_model);
263 else
264 return sprintf(buf, "n/a\n");
265}
266
267static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400268cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269{
270 struct ccw_device *cdev = to_ccwdev(dev);
271 struct ccw_device_id *id = &(cdev->id);
272
273 return sprintf(buf, "%04x/%02x\n",
274 id->cu_type, id->cu_model);
275}
276
277static ssize_t
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800278modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
279{
280 struct ccw_device *cdev = to_ccwdev(dev);
281 struct ccw_device_id *id = &(cdev->id);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200282 int len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800283
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200284 len = snprint_alias(buf, PAGE_SIZE, "", id, "\n") + 1;
285
286 return len > PAGE_SIZE ? PAGE_SIZE : len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800287}
288
289static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400290online_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
292 struct ccw_device *cdev = to_ccwdev(dev);
293
294 return sprintf(buf, cdev->online ? "1\n" : "0\n");
295}
296
297static void
298ccw_device_remove_disconnected(struct ccw_device *cdev)
299{
300 struct subchannel *sch;
301 /*
302 * Forced offline in disconnected state means
303 * 'throw away device'.
304 */
305 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck6ab48792006-07-12 16:39:50 +0200306 css_sch_device_unregister(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 /* Reset intparm to zeroes. */
308 sch->schib.pmcw.intparm = 0;
309 cio_modify(sch);
310 put_device(&sch->dev);
311}
312
313int
314ccw_device_set_offline(struct ccw_device *cdev)
315{
316 int ret;
317
318 if (!cdev)
319 return -ENODEV;
320 if (!cdev->online || !cdev->drv)
321 return -EINVAL;
322
323 if (cdev->drv->set_offline) {
324 ret = cdev->drv->set_offline(cdev);
325 if (ret != 0)
326 return ret;
327 }
328 cdev->online = 0;
329 spin_lock_irq(cdev->ccwlock);
330 ret = ccw_device_offline(cdev);
331 if (ret == -ENODEV) {
332 if (cdev->private->state != DEV_STATE_NOT_OPER) {
333 cdev->private->state = DEV_STATE_OFFLINE;
334 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
335 }
336 spin_unlock_irq(cdev->ccwlock);
337 return ret;
338 }
339 spin_unlock_irq(cdev->ccwlock);
340 if (ret == 0)
341 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
342 else {
343 pr_debug("ccw_device_offline returned %d, device %s\n",
344 ret, cdev->dev.bus_id);
345 cdev->online = 1;
346 }
347 return ret;
348}
349
350int
351ccw_device_set_online(struct ccw_device *cdev)
352{
353 int ret;
354
355 if (!cdev)
356 return -ENODEV;
357 if (cdev->online || !cdev->drv)
358 return -EINVAL;
359
360 spin_lock_irq(cdev->ccwlock);
361 ret = ccw_device_online(cdev);
362 spin_unlock_irq(cdev->ccwlock);
363 if (ret == 0)
364 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
365 else {
366 pr_debug("ccw_device_online returned %d, device %s\n",
367 ret, cdev->dev.bus_id);
368 return ret;
369 }
370 if (cdev->private->state != DEV_STATE_ONLINE)
371 return -ENODEV;
372 if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
373 cdev->online = 1;
374 return 0;
375 }
376 spin_lock_irq(cdev->ccwlock);
377 ret = ccw_device_offline(cdev);
378 spin_unlock_irq(cdev->ccwlock);
379 if (ret == 0)
380 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
381 else
382 pr_debug("ccw_device_offline returned %d, device %s\n",
383 ret, cdev->dev.bus_id);
Cornelia Huck6cadb782006-02-17 13:52:49 -0800384 return (ret == 0) ? -ENODEV : ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385}
386
387static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400388online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389{
390 struct ccw_device *cdev = to_ccwdev(dev);
391 int i, force, ret;
392 char *tmp;
393
Martin Schwidefsky973bd992006-01-06 00:19:07 -0800394 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return -EAGAIN;
396
397 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
398 atomic_set(&cdev->private->onoff, 0);
399 return -EINVAL;
400 }
401 if (!strncmp(buf, "force\n", count)) {
402 force = 1;
403 i = 1;
404 } else {
405 force = 0;
406 i = simple_strtoul(buf, &tmp, 16);
407 }
408 if (i == 1) {
409 /* Do device recognition, if needed. */
410 if (cdev->id.cu_type == 0) {
411 ret = ccw_device_recognition(cdev);
412 if (ret) {
413 printk(KERN_WARNING"Couldn't start recognition "
414 "for device %s (ret=%d)\n",
415 cdev->dev.bus_id, ret);
416 goto out;
417 }
418 wait_event(cdev->private->wait_q,
419 cdev->private->flags.recog_done);
420 }
421 if (cdev->drv && cdev->drv->set_online)
422 ccw_device_set_online(cdev);
423 } else if (i == 0) {
424 if (cdev->private->state == DEV_STATE_DISCONNECTED)
425 ccw_device_remove_disconnected(cdev);
426 else if (cdev->drv && cdev->drv->set_offline)
427 ccw_device_set_offline(cdev);
428 }
429 if (force && cdev->private->state == DEV_STATE_BOXED) {
430 ret = ccw_device_stlck(cdev);
431 if (ret) {
432 printk(KERN_WARNING"ccw_device_stlck for device %s "
433 "returned %d!\n", cdev->dev.bus_id, ret);
434 goto out;
435 }
436 /* Do device recognition, if needed. */
437 if (cdev->id.cu_type == 0) {
438 cdev->private->state = DEV_STATE_NOT_OPER;
439 ret = ccw_device_recognition(cdev);
440 if (ret) {
441 printk(KERN_WARNING"Couldn't start recognition "
442 "for device %s (ret=%d)\n",
443 cdev->dev.bus_id, ret);
444 goto out;
445 }
446 wait_event(cdev->private->wait_q,
447 cdev->private->flags.recog_done);
448 }
449 if (cdev->drv && cdev->drv->set_online)
450 ccw_device_set_online(cdev);
451 }
452 out:
453 if (cdev->drv)
454 module_put(cdev->drv->owner);
455 atomic_set(&cdev->private->onoff, 0);
456 return count;
457}
458
459static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400460available_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461{
462 struct ccw_device *cdev = to_ccwdev(dev);
463 struct subchannel *sch;
464
465 switch (cdev->private->state) {
466 case DEV_STATE_BOXED:
467 return sprintf(buf, "boxed\n");
468 case DEV_STATE_DISCONNECTED:
469 case DEV_STATE_DISCONNECTED_SENSE_ID:
470 case DEV_STATE_NOT_OPER:
471 sch = to_subchannel(dev->parent);
472 if (!sch->lpm)
473 return sprintf(buf, "no path\n");
474 else
475 return sprintf(buf, "no device\n");
476 default:
477 /* All other states considered fine. */
478 return sprintf(buf, "good\n");
479 }
480}
481
482static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
483static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
484static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
485static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800486static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487static DEVICE_ATTR(online, 0644, online_show, online_store);
488extern struct device_attribute dev_attr_cmb_enable;
489static DEVICE_ATTR(availability, 0444, available_show, NULL);
490
491static struct attribute * subch_attrs[] = {
492 &dev_attr_chpids.attr,
493 &dev_attr_pimpampom.attr,
494 NULL,
495};
496
497static struct attribute_group subch_attr_group = {
498 .attrs = subch_attrs,
499};
500
501static inline int
502subchannel_add_files (struct device *dev)
503{
504 return sysfs_create_group(&dev->kobj, &subch_attr_group);
505}
506
507static struct attribute * ccwdev_attrs[] = {
508 &dev_attr_devtype.attr,
509 &dev_attr_cutype.attr,
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800510 &dev_attr_modalias.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 &dev_attr_online.attr,
512 &dev_attr_cmb_enable.attr,
513 &dev_attr_availability.attr,
514 NULL,
515};
516
517static struct attribute_group ccwdev_attr_group = {
518 .attrs = ccwdev_attrs,
519};
520
521static inline int
522device_add_files (struct device *dev)
523{
524 return sysfs_create_group(&dev->kobj, &ccwdev_attr_group);
525}
526
527static inline void
528device_remove_files(struct device *dev)
529{
530 sysfs_remove_group(&dev->kobj, &ccwdev_attr_group);
531}
532
533/* this is a simple abstraction for device_register that sets the
534 * correct bus type and adds the bus specific files */
535int
536ccw_device_register(struct ccw_device *cdev)
537{
538 struct device *dev = &cdev->dev;
539 int ret;
540
541 dev->bus = &ccw_bus_type;
542
543 if ((ret = device_add(dev)))
544 return ret;
545
546 set_bit(1, &cdev->private->registered);
547 if ((ret = device_add_files(dev))) {
548 if (test_and_clear_bit(1, &cdev->private->registered))
549 device_del(dev);
550 }
551 return ret;
552}
553
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700554struct match_data {
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800555 unsigned int devno;
556 unsigned int ssid;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700557 struct ccw_device * sibling;
558};
559
560static int
561match_devno(struct device * dev, void * data)
562{
563 struct match_data * d = (struct match_data *)data;
564 struct ccw_device * cdev;
565
566 cdev = to_ccwdev(dev);
567 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
568 (cdev->private->devno == d->devno) &&
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800569 (cdev->private->ssid == d->ssid) &&
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700570 (cdev != d->sibling)) {
571 cdev->private->state = DEV_STATE_NOT_OPER;
572 return 1;
573 }
574 return 0;
575}
576
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577static struct ccw_device *
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800578get_disc_ccwdev_by_devno(unsigned int devno, unsigned int ssid,
579 struct ccw_device *sibling)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 struct device *dev;
Heiko Carstens292888c2006-08-30 14:33:35 +0200582 struct match_data data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Heiko Carstens292888c2006-08-30 14:33:35 +0200584 data.devno = devno;
585 data.ssid = ssid;
586 data.sibling = sibling;
Cornelia Hucke5945b42005-10-11 08:28:59 -0700587 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700589 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590}
591
592static void
593ccw_device_add_changed(void *data)
594{
595
596 struct ccw_device *cdev;
597
598 cdev = (struct ccw_device *)data;
599 if (device_add(&cdev->dev)) {
600 put_device(&cdev->dev);
601 return;
602 }
603 set_bit(1, &cdev->private->registered);
604 if (device_add_files(&cdev->dev)) {
605 if (test_and_clear_bit(1, &cdev->private->registered))
606 device_unregister(&cdev->dev);
607 }
608}
609
610extern int css_get_ssd_info(struct subchannel *sch);
611
612void
613ccw_device_do_unreg_rereg(void *data)
614{
615 struct ccw_device *cdev;
616 struct subchannel *sch;
617 int need_rename;
618
619 cdev = (struct ccw_device *)data;
620 sch = to_subchannel(cdev->dev.parent);
621 if (cdev->private->devno != sch->schib.pmcw.dev) {
622 /*
623 * The device number has changed. This is usually only when
624 * a device has been detached under VM and then re-appeared
625 * on another subchannel because of a different attachment
626 * order than before. Ideally, we should should just switch
627 * subchannels, but unfortunately, this is not possible with
628 * the current implementation.
629 * Instead, we search for the old subchannel for this device
630 * number and deregister so there are no collisions with the
631 * newly registered ccw_device.
632 * FIXME: Find another solution so the block layer doesn't
633 * get possibly sick...
634 */
635 struct ccw_device *other_cdev;
636
637 need_rename = 1;
638 other_cdev = get_disc_ccwdev_by_devno(sch->schib.pmcw.dev,
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800639 sch->schid.ssid, cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 if (other_cdev) {
641 struct subchannel *other_sch;
642
643 other_sch = to_subchannel(other_cdev->dev.parent);
644 if (get_device(&other_sch->dev)) {
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800645 stsch(other_sch->schid, &other_sch->schib);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 if (other_sch->schib.pmcw.dnv) {
647 other_sch->schib.pmcw.intparm = 0;
648 cio_modify(other_sch);
649 }
Cornelia Huck6ab48792006-07-12 16:39:50 +0200650 css_sch_device_unregister(other_sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 }
652 }
653 /* Update ssd info here. */
654 css_get_ssd_info(sch);
655 cdev->private->devno = sch->schib.pmcw.dev;
656 } else
657 need_rename = 0;
658 device_remove_files(&cdev->dev);
659 if (test_and_clear_bit(1, &cdev->private->registered))
660 device_del(&cdev->dev);
661 if (need_rename)
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800662 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
663 sch->schid.ssid, sch->schib.pmcw.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 PREPARE_WORK(&cdev->private->kick_work,
665 ccw_device_add_changed, (void *)cdev);
666 queue_work(ccw_device_work, &cdev->private->kick_work);
667}
668
669static void
670ccw_device_release(struct device *dev)
671{
672 struct ccw_device *cdev;
673
674 cdev = to_ccwdev(dev);
675 kfree(cdev->private);
676 kfree(cdev);
677}
678
679/*
680 * Register recognized device.
681 */
682static void
683io_subchannel_register(void *data)
684{
685 struct ccw_device *cdev;
686 struct subchannel *sch;
687 int ret;
688 unsigned long flags;
689
690 cdev = (struct ccw_device *) data;
691 sch = to_subchannel(cdev->dev.parent);
692
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700693 if (klist_node_attached(&cdev->dev.knode_parent)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 bus_rescan_devices(&ccw_bus_type);
695 goto out;
696 }
697 /* make it known to the system */
698 ret = ccw_device_register(cdev);
699 if (ret) {
700 printk (KERN_WARNING "%s: could not register %s\n",
701 __func__, cdev->dev.bus_id);
702 put_device(&cdev->dev);
703 spin_lock_irqsave(&sch->lock, flags);
704 sch->dev.driver_data = NULL;
705 spin_unlock_irqrestore(&sch->lock, flags);
706 kfree (cdev->private);
707 kfree (cdev);
708 put_device(&sch->dev);
709 if (atomic_dec_and_test(&ccw_device_init_count))
710 wake_up(&ccw_device_init_wq);
711 return;
712 }
713
714 ret = subchannel_add_files(cdev->dev.parent);
715 if (ret)
716 printk(KERN_WARNING "%s: could not add attributes to %s\n",
717 __func__, sch->dev.bus_id);
718 put_device(&cdev->dev);
719out:
720 cdev->private->flags.recog_done = 1;
721 put_device(&sch->dev);
722 wake_up(&cdev->private->wait_q);
723 if (atomic_dec_and_test(&ccw_device_init_count))
724 wake_up(&ccw_device_init_wq);
725}
726
727void
728ccw_device_call_sch_unregister(void *data)
729{
730 struct ccw_device *cdev = data;
731 struct subchannel *sch;
732
733 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck6ab48792006-07-12 16:39:50 +0200734 css_sch_device_unregister(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 /* Reset intparm to zeroes. */
736 sch->schib.pmcw.intparm = 0;
737 cio_modify(sch);
738 put_device(&cdev->dev);
739 put_device(&sch->dev);
740}
741
742/*
743 * subchannel recognition done. Called from the state machine.
744 */
745void
746io_subchannel_recog_done(struct ccw_device *cdev)
747{
748 struct subchannel *sch;
749
750 if (css_init_done == 0) {
751 cdev->private->flags.recog_done = 1;
752 return;
753 }
754 switch (cdev->private->state) {
755 case DEV_STATE_NOT_OPER:
756 cdev->private->flags.recog_done = 1;
757 /* Remove device found not operational. */
758 if (!get_device(&cdev->dev))
759 break;
760 sch = to_subchannel(cdev->dev.parent);
761 PREPARE_WORK(&cdev->private->kick_work,
762 ccw_device_call_sch_unregister, (void *) cdev);
763 queue_work(slow_path_wq, &cdev->private->kick_work);
764 if (atomic_dec_and_test(&ccw_device_init_count))
765 wake_up(&ccw_device_init_wq);
766 break;
767 case DEV_STATE_BOXED:
768 /* Device did not respond in time. */
769 case DEV_STATE_OFFLINE:
770 /*
771 * We can't register the device in interrupt context so
772 * we schedule a work item.
773 */
774 if (!get_device(&cdev->dev))
775 break;
776 PREPARE_WORK(&cdev->private->kick_work,
777 io_subchannel_register, (void *) cdev);
778 queue_work(slow_path_wq, &cdev->private->kick_work);
779 break;
780 }
781}
782
783static int
784io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
785{
786 int rc;
787 struct ccw_device_private *priv;
788
789 sch->dev.driver_data = cdev;
790 sch->driver = &io_subchannel_driver;
791 cdev->ccwlock = &sch->lock;
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 /* Init private data. */
794 priv = cdev->private;
795 priv->devno = sch->schib.pmcw.dev;
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800796 priv->ssid = sch->schid.ssid;
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800797 priv->sch_no = sch->schid.sch_no;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 priv->state = DEV_STATE_NOT_OPER;
799 INIT_LIST_HEAD(&priv->cmb_list);
800 init_waitqueue_head(&priv->wait_q);
801 init_timer(&priv->timer);
802
803 /* Set an initial name for the device. */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800804 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
805 sch->schid.ssid, sch->schib.pmcw.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 /* Increase counter of devices currently in recognition. */
808 atomic_inc(&ccw_device_init_count);
809
810 /* Start async. device sensing. */
811 spin_lock_irq(&sch->lock);
812 rc = ccw_device_recognition(cdev);
813 spin_unlock_irq(&sch->lock);
814 if (rc) {
815 if (atomic_dec_and_test(&ccw_device_init_count))
816 wake_up(&ccw_device_init_wq);
817 }
818 return rc;
819}
820
821static int
Cornelia Huck8bbace72006-01-11 10:56:22 +0100822io_subchannel_probe (struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 struct ccw_device *cdev;
825 int rc;
826 unsigned long flags;
827
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 if (sch->dev.driver_data) {
829 /*
830 * This subchannel already has an associated ccw_device.
831 * Register it and exit. This happens for all early
832 * device, e.g. the console.
833 */
834 cdev = sch->dev.driver_data;
835 device_initialize(&cdev->dev);
836 ccw_device_register(cdev);
837 subchannel_add_files(&sch->dev);
838 /*
839 * Check if the device is already online. If it is
840 * the reference count needs to be corrected
841 * (see ccw_device_online and css_init_done for the
842 * ugly details).
843 */
844 if (cdev->private->state != DEV_STATE_NOT_OPER &&
845 cdev->private->state != DEV_STATE_OFFLINE &&
846 cdev->private->state != DEV_STATE_BOXED)
847 get_device(&cdev->dev);
848 return 0;
849 }
Eric Sesterhenn88abaab2006-03-24 03:15:31 -0800850 cdev = kzalloc (sizeof(*cdev), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 if (!cdev)
852 return -ENOMEM;
Eric Sesterhenn88abaab2006-03-24 03:15:31 -0800853 cdev->private = kzalloc(sizeof(struct ccw_device_private),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 GFP_KERNEL | GFP_DMA);
855 if (!cdev->private) {
856 kfree(cdev);
857 return -ENOMEM;
858 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 atomic_set(&cdev->private->onoff, 0);
Heiko Carstens292888c2006-08-30 14:33:35 +0200860 cdev->dev.parent = &sch->dev;
861 cdev->dev.release = ccw_device_release;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 INIT_LIST_HEAD(&cdev->private->kick_work.entry);
863 /* Do first half of device_register. */
864 device_initialize(&cdev->dev);
865
866 if (!get_device(&sch->dev)) {
867 if (cdev->dev.release)
868 cdev->dev.release(&cdev->dev);
869 return -ENODEV;
870 }
871
Cornelia Huck8bbace72006-01-11 10:56:22 +0100872 rc = io_subchannel_recog(cdev, sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 if (rc) {
874 spin_lock_irqsave(&sch->lock, flags);
875 sch->dev.driver_data = NULL;
876 spin_unlock_irqrestore(&sch->lock, flags);
877 if (cdev->dev.release)
878 cdev->dev.release(&cdev->dev);
879 }
880
881 return rc;
882}
883
884static void
885ccw_device_unregister(void *data)
886{
887 struct ccw_device *cdev;
888
889 cdev = (struct ccw_device *)data;
890 if (test_and_clear_bit(1, &cdev->private->registered))
891 device_unregister(&cdev->dev);
892 put_device(&cdev->dev);
893}
894
895static int
Cornelia Huck8bbace72006-01-11 10:56:22 +0100896io_subchannel_remove (struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897{
898 struct ccw_device *cdev;
899 unsigned long flags;
900
Cornelia Huck8bbace72006-01-11 10:56:22 +0100901 if (!sch->dev.driver_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 return 0;
Cornelia Huck8bbace72006-01-11 10:56:22 +0100903 cdev = sch->dev.driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 /* Set ccw device to not operational and drop reference. */
905 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huck8bbace72006-01-11 10:56:22 +0100906 sch->dev.driver_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 cdev->private->state = DEV_STATE_NOT_OPER;
908 spin_unlock_irqrestore(cdev->ccwlock, flags);
909 /*
910 * Put unregistration on workqueue to avoid livelocks on the css bus
911 * semaphore.
912 */
913 if (get_device(&cdev->dev)) {
914 PREPARE_WORK(&cdev->private->kick_work,
915 ccw_device_unregister, (void *) cdev);
916 queue_work(ccw_device_work, &cdev->private->kick_work);
917 }
918 return 0;
919}
920
921static int
922io_subchannel_notify(struct device *dev, int event)
923{
924 struct ccw_device *cdev;
925
926 cdev = dev->driver_data;
927 if (!cdev)
928 return 0;
929 if (!cdev->drv)
930 return 0;
931 if (!cdev->online)
932 return 0;
933 return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
934}
935
936static void
937io_subchannel_verify(struct device *dev)
938{
939 struct ccw_device *cdev;
940
941 cdev = dev->driver_data;
942 if (cdev)
943 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
944}
945
946static void
947io_subchannel_ioterm(struct device *dev)
948{
949 struct ccw_device *cdev;
950
951 cdev = dev->driver_data;
952 if (!cdev)
953 return;
954 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
955 if (cdev->handler)
956 cdev->handler(cdev, cdev->private->intparm,
957 ERR_PTR(-EIO));
958}
959
960static void
Cornelia Huck8bbace72006-01-11 10:56:22 +0100961io_subchannel_shutdown(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 struct ccw_device *cdev;
964 int ret;
965
Cornelia Huck8bbace72006-01-11 10:56:22 +0100966 cdev = sch->dev.driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
Cornelia Hucka8237fc2006-01-06 00:19:21 -0800968 if (cio_is_console(sch->schid))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 return;
970 if (!sch->schib.pmcw.ena)
971 /* Nothing to do. */
972 return;
973 ret = cio_disable_subchannel(sch);
974 if (ret != -EBUSY)
975 /* Subchannel is disabled, we're done. */
976 return;
977 cdev->private->state = DEV_STATE_QUIESCE;
978 if (cdev->handler)
979 cdev->handler(cdev, cdev->private->intparm,
980 ERR_PTR(-EIO));
981 ret = ccw_device_cancel_halt_clear(cdev);
982 if (ret == -EBUSY) {
983 ccw_device_set_timeout(cdev, HZ/10);
984 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
985 }
986 cio_disable_subchannel(sch);
987}
988
989#ifdef CONFIG_CCW_CONSOLE
990static struct ccw_device console_cdev;
991static struct ccw_device_private console_private;
992static int console_cdev_in_use;
993
994static int
995ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
996{
997 int rc;
998
999 /* Initialize the ccw_device structure. */
Heiko Carstens292888c2006-08-30 14:33:35 +02001000 cdev->dev.parent= &sch->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 rc = io_subchannel_recog(cdev, sch);
1002 if (rc)
1003 return rc;
1004
1005 /* Now wait for the async. recognition to come to an end. */
1006 spin_lock_irq(cdev->ccwlock);
1007 while (!dev_fsm_final_state(cdev))
1008 wait_cons_dev();
1009 rc = -EIO;
1010 if (cdev->private->state != DEV_STATE_OFFLINE)
1011 goto out_unlock;
1012 ccw_device_online(cdev);
1013 while (!dev_fsm_final_state(cdev))
1014 wait_cons_dev();
1015 if (cdev->private->state != DEV_STATE_ONLINE)
1016 goto out_unlock;
1017 rc = 0;
1018out_unlock:
1019 spin_unlock_irq(cdev->ccwlock);
1020 return 0;
1021}
1022
1023struct ccw_device *
1024ccw_device_probe_console(void)
1025{
1026 struct subchannel *sch;
1027 int ret;
1028
1029 if (xchg(&console_cdev_in_use, 1) != 0)
Peter Oberparleiter600b5d12006-02-01 03:06:35 -08001030 return ERR_PTR(-EBUSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 sch = cio_probe_console();
1032 if (IS_ERR(sch)) {
1033 console_cdev_in_use = 0;
1034 return (void *) sch;
1035 }
1036 memset(&console_cdev, 0, sizeof(struct ccw_device));
1037 memset(&console_private, 0, sizeof(struct ccw_device_private));
1038 console_cdev.private = &console_private;
1039 ret = ccw_device_console_enable(&console_cdev, sch);
1040 if (ret) {
1041 cio_release_console();
1042 console_cdev_in_use = 0;
1043 return ERR_PTR(ret);
1044 }
1045 console_cdev.online = 1;
1046 return &console_cdev;
1047}
1048#endif
1049
1050/*
1051 * get ccw_device matching the busid, but only if owned by cdrv
1052 */
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001053static int
1054__ccwdev_check_busid(struct device *dev, void *id)
1055{
1056 char *bus_id;
1057
1058 bus_id = (char *)id;
1059
1060 return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
1061}
1062
1063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064struct ccw_device *
1065get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
1066{
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001067 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 struct device_driver *drv;
1069
1070 drv = get_driver(&cdrv->driver);
1071 if (!drv)
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001072 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001074 dev = driver_find_device(drv, NULL, (void *)bus_id,
1075 __ccwdev_check_busid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 put_driver(drv);
1077
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001078 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079}
1080
1081/************************** device driver handling ************************/
1082
1083/* This is the implementation of the ccw_driver class. The probe, remove
1084 * and release methods are initially very similar to the device_driver
1085 * implementations, with the difference that they have ccw_device
1086 * arguments.
1087 *
1088 * A ccw driver also contains the information that is needed for
1089 * device matching.
1090 */
1091static int
1092ccw_device_probe (struct device *dev)
1093{
1094 struct ccw_device *cdev = to_ccwdev(dev);
1095 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1096 int ret;
1097
1098 cdev->drv = cdrv; /* to let the driver call _set_online */
1099
1100 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1101
1102 if (ret) {
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001103 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 return ret;
1105 }
1106
1107 return 0;
1108}
1109
1110static int
1111ccw_device_remove (struct device *dev)
1112{
1113 struct ccw_device *cdev = to_ccwdev(dev);
1114 struct ccw_driver *cdrv = cdev->drv;
1115 int ret;
1116
1117 pr_debug("removing device %s\n", cdev->dev.bus_id);
1118 if (cdrv->remove)
1119 cdrv->remove(cdev);
1120 if (cdev->online) {
1121 cdev->online = 0;
1122 spin_lock_irq(cdev->ccwlock);
1123 ret = ccw_device_offline(cdev);
1124 spin_unlock_irq(cdev->ccwlock);
1125 if (ret == 0)
1126 wait_event(cdev->private->wait_q,
1127 dev_fsm_final_state(cdev));
1128 else
1129 //FIXME: we can't fail!
1130 pr_debug("ccw_device_offline returned %d, device %s\n",
1131 ret, cdev->dev.bus_id);
1132 }
1133 ccw_device_set_timeout(cdev, 0);
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001134 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 return 0;
1136}
1137
Cornelia Huck8bbace72006-01-11 10:56:22 +01001138struct bus_type ccw_bus_type = {
1139 .name = "ccw",
1140 .match = ccw_bus_match,
1141 .uevent = ccw_uevent,
1142 .probe = ccw_device_probe,
1143 .remove = ccw_device_remove,
1144};
1145
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146int
1147ccw_driver_register (struct ccw_driver *cdriver)
1148{
1149 struct device_driver *drv = &cdriver->driver;
1150
1151 drv->bus = &ccw_bus_type;
1152 drv->name = cdriver->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
1154 return driver_register(drv);
1155}
1156
1157void
1158ccw_driver_unregister (struct ccw_driver *cdriver)
1159{
1160 driver_unregister(&cdriver->driver);
1161}
1162
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001163/* Helper func for qdio. */
1164struct subchannel_id
1165ccw_device_get_subchannel_id(struct ccw_device *cdev)
1166{
1167 struct subchannel *sch;
1168
1169 sch = to_subchannel(cdev->dev.parent);
1170 return sch->schid;
1171}
1172
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173MODULE_LICENSE("GPL");
1174EXPORT_SYMBOL(ccw_device_set_online);
1175EXPORT_SYMBOL(ccw_device_set_offline);
1176EXPORT_SYMBOL(ccw_driver_register);
1177EXPORT_SYMBOL(ccw_driver_unregister);
1178EXPORT_SYMBOL(get_ccwdev_by_busid);
1179EXPORT_SYMBOL(ccw_bus_type);
1180EXPORT_SYMBOL(ccw_device_work);
1181EXPORT_SYMBOL(ccw_device_notify_work);
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001182EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);