blob: 34e7d77b997d844c300f9b76419df757443c39a4 [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"
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +010026#include "cio_debug.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "css.h"
28#include "device.h"
29#include "ioasm.h"
30
31/******************* bus type handling ***********************/
32
33/* The Linux driver model distinguishes between a bus type and
34 * the bus itself. Of course we only have one channel
35 * subsystem driver and one channel system per machine, but
36 * we still use the abstraction. T.R. says it's a good idea. */
37static int
38ccw_bus_match (struct device * dev, struct device_driver * drv)
39{
40 struct ccw_device *cdev = to_ccwdev(dev);
41 struct ccw_driver *cdrv = to_ccwdrv(drv);
42 const struct ccw_device_id *ids = cdrv->ids, *found;
43
44 if (!ids)
45 return 0;
46
47 found = ccw_device_id_match(ids, &cdev->id);
48 if (!found)
49 return 0;
50
51 cdev->id.driver_info = found->driver_info;
52
53 return 1;
54}
55
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020056/* Store modalias string delimited by prefix/suffix string into buffer with
57 * specified size. Return length of resulting string (excluding trailing '\0')
58 * even if string doesn't fit buffer (snprintf semantics). */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020059static int snprint_alias(char *buf, size_t size,
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020060 struct ccw_device_id *id, const char *suffix)
61{
62 int len;
63
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020064 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020065 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;
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020087 int len = 0;
88 int ret;
89 char modalias_buf[30];
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020091 /* CU_TYPE= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020092 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
93 "CU_TYPE=%04X", id->cu_type);
94 if (ret)
95 return ret;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020096
97 /* CU_MODEL= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020098 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
99 "CU_MODEL=%02X", id->cu_model);
100 if (ret)
101 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 /* The next two can be zero, that's ok for us */
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200104 /* DEV_TYPE= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200105 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
106 "DEV_TYPE=%04X", id->dev_type);
107 if (ret)
108 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200110 /* DEV_MODEL= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200111 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
112 "DEV_MODEL=%02X", id->dev_model);
113 if (ret)
114 return ret;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200115
116 /* MODALIAS= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200117 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
118 ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
119 "MODALIAS=%s", modalias_buf);
120 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121}
122
Cornelia Huck8bbace72006-01-11 10:56:22 +0100123struct bus_type ccw_bus_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Cornelia Huck8bbace72006-01-11 10:56:22 +0100125static int io_subchannel_probe (struct subchannel *);
126static int io_subchannel_remove (struct subchannel *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127static int io_subchannel_notify(struct device *, int);
128static void io_subchannel_verify(struct device *);
129static void io_subchannel_ioterm(struct device *);
Cornelia Huck8bbace72006-01-11 10:56:22 +0100130static void io_subchannel_shutdown(struct subchannel *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
132struct css_driver io_subchannel_driver = {
133 .subchannel_type = SUBCHANNEL_TYPE_IO,
134 .drv = {
135 .name = "io_subchannel",
136 .bus = &css_bus_type,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 },
138 .irq = io_subchannel_irq,
139 .notify = io_subchannel_notify,
140 .verify = io_subchannel_verify,
141 .termination = io_subchannel_ioterm,
Cornelia Huck8bbace72006-01-11 10:56:22 +0100142 .probe = io_subchannel_probe,
143 .remove = io_subchannel_remove,
144 .shutdown = io_subchannel_shutdown,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145};
146
147struct workqueue_struct *ccw_device_work;
148struct workqueue_struct *ccw_device_notify_work;
Peter Oberparleiter40154b82006-06-29 14:57:03 +0200149wait_queue_head_t ccw_device_init_wq;
150atomic_t ccw_device_init_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152static int __init
153init_ccw_bus_type (void)
154{
155 int ret;
156
157 init_waitqueue_head(&ccw_device_init_wq);
158 atomic_set(&ccw_device_init_count, 0);
159
160 ccw_device_work = create_singlethread_workqueue("cio");
161 if (!ccw_device_work)
162 return -ENOMEM; /* FIXME: better errno ? */
163 ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
164 if (!ccw_device_notify_work) {
165 ret = -ENOMEM; /* FIXME: better errno ? */
166 goto out_err;
167 }
168 slow_path_wq = create_singlethread_workqueue("kslowcrw");
169 if (!slow_path_wq) {
170 ret = -ENOMEM; /* FIXME: better errno ? */
171 goto out_err;
172 }
173 if ((ret = bus_register (&ccw_bus_type)))
174 goto out_err;
175
176 if ((ret = driver_register(&io_subchannel_driver.drv)))
177 goto out_err;
178
179 wait_event(ccw_device_init_wq,
180 atomic_read(&ccw_device_init_count) == 0);
181 flush_workqueue(ccw_device_work);
182 return 0;
183out_err:
184 if (ccw_device_work)
185 destroy_workqueue(ccw_device_work);
186 if (ccw_device_notify_work)
187 destroy_workqueue(ccw_device_notify_work);
188 if (slow_path_wq)
189 destroy_workqueue(slow_path_wq);
190 return ret;
191}
192
193static void __exit
194cleanup_ccw_bus_type (void)
195{
196 driver_unregister(&io_subchannel_driver.drv);
197 bus_unregister(&ccw_bus_type);
198 destroy_workqueue(ccw_device_notify_work);
199 destroy_workqueue(ccw_device_work);
200}
201
202subsys_initcall(init_ccw_bus_type);
203module_exit(cleanup_ccw_bus_type);
204
205/************************ device handling **************************/
206
207/*
208 * A ccw_device has some interfaces in sysfs in addition to the
209 * standard ones.
210 * The following entries are designed to export the information which
211 * resided in 2.4 in /proc/subchannels. Subchannel and device number
212 * are obvious, so they don't have an entry :)
213 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
214 */
215static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400216chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217{
218 struct subchannel *sch = to_subchannel(dev);
219 struct ssd_info *ssd = &sch->ssd_info;
220 ssize_t ret = 0;
221 int chp;
222
Cornelia Huck32c5b052007-02-05 21:16:56 +0100223 for (chp = 0; chp < 8; chp++)
224 ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 ret += sprintf (buf+ret, "\n");
226 return min((ssize_t)PAGE_SIZE, ret);
227}
228
229static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400230pimpampom_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 pmcw *pmcw = &sch->schib.pmcw;
234
235 return sprintf (buf, "%02x %02x %02x\n",
236 pmcw->pim, pmcw->pam, pmcw->pom);
237}
238
239static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400240devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241{
242 struct ccw_device *cdev = to_ccwdev(dev);
243 struct ccw_device_id *id = &(cdev->id);
244
245 if (id->dev_type != 0)
246 return sprintf(buf, "%04x/%02x\n",
247 id->dev_type, id->dev_model);
248 else
249 return sprintf(buf, "n/a\n");
250}
251
252static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400253cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 struct ccw_device *cdev = to_ccwdev(dev);
256 struct ccw_device_id *id = &(cdev->id);
257
258 return sprintf(buf, "%04x/%02x\n",
259 id->cu_type, id->cu_model);
260}
261
262static ssize_t
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800263modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
264{
265 struct ccw_device *cdev = to_ccwdev(dev);
266 struct ccw_device_id *id = &(cdev->id);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200267 int len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800268
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200269 len = snprint_alias(buf, PAGE_SIZE, id, "\n") + 1;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200270
271 return len > PAGE_SIZE ? PAGE_SIZE : len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800272}
273
274static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400275online_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
277 struct ccw_device *cdev = to_ccwdev(dev);
278
279 return sprintf(buf, cdev->online ? "1\n" : "0\n");
280}
281
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100282int ccw_device_is_orphan(struct ccw_device *cdev)
283{
284 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
285}
286
Cornelia Huck7674da72006-12-08 15:54:21 +0100287static void ccw_device_unregister(struct work_struct *work)
288{
289 struct ccw_device_private *priv;
290 struct ccw_device *cdev;
291
292 priv = container_of(work, struct ccw_device_private, kick_work);
293 cdev = priv->cdev;
294 if (test_and_clear_bit(1, &cdev->private->registered))
295 device_unregister(&cdev->dev);
296 put_device(&cdev->dev);
297}
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299static void
300ccw_device_remove_disconnected(struct ccw_device *cdev)
301{
302 struct subchannel *sch;
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100303 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 /*
305 * Forced offline in disconnected state means
306 * 'throw away device'.
307 */
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100308 if (ccw_device_is_orphan(cdev)) {
309 /* Deregister ccw device. */
310 spin_lock_irqsave(cdev->ccwlock, flags);
311 cdev->private->state = DEV_STATE_NOT_OPER;
312 spin_unlock_irqrestore(cdev->ccwlock, flags);
313 if (get_device(&cdev->dev)) {
314 PREPARE_WORK(&cdev->private->kick_work,
315 ccw_device_unregister);
316 queue_work(ccw_device_work, &cdev->private->kick_work);
317 }
318 return ;
319 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck6ab48792006-07-12 16:39:50 +0200321 css_sch_device_unregister(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 /* Reset intparm to zeroes. */
323 sch->schib.pmcw.intparm = 0;
324 cio_modify(sch);
325 put_device(&sch->dev);
326}
327
328int
329ccw_device_set_offline(struct ccw_device *cdev)
330{
331 int ret;
332
333 if (!cdev)
334 return -ENODEV;
335 if (!cdev->online || !cdev->drv)
336 return -EINVAL;
337
338 if (cdev->drv->set_offline) {
339 ret = cdev->drv->set_offline(cdev);
340 if (ret != 0)
341 return ret;
342 }
343 cdev->online = 0;
344 spin_lock_irq(cdev->ccwlock);
345 ret = ccw_device_offline(cdev);
346 if (ret == -ENODEV) {
347 if (cdev->private->state != DEV_STATE_NOT_OPER) {
348 cdev->private->state = DEV_STATE_OFFLINE;
349 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
350 }
351 spin_unlock_irq(cdev->ccwlock);
352 return ret;
353 }
354 spin_unlock_irq(cdev->ccwlock);
355 if (ret == 0)
356 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
357 else {
358 pr_debug("ccw_device_offline returned %d, device %s\n",
359 ret, cdev->dev.bus_id);
360 cdev->online = 1;
361 }
362 return ret;
363}
364
365int
366ccw_device_set_online(struct ccw_device *cdev)
367{
368 int ret;
369
370 if (!cdev)
371 return -ENODEV;
372 if (cdev->online || !cdev->drv)
373 return -EINVAL;
374
375 spin_lock_irq(cdev->ccwlock);
376 ret = ccw_device_online(cdev);
377 spin_unlock_irq(cdev->ccwlock);
378 if (ret == 0)
379 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
380 else {
381 pr_debug("ccw_device_online returned %d, device %s\n",
382 ret, cdev->dev.bus_id);
383 return ret;
384 }
385 if (cdev->private->state != DEV_STATE_ONLINE)
386 return -ENODEV;
387 if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
388 cdev->online = 1;
389 return 0;
390 }
391 spin_lock_irq(cdev->ccwlock);
392 ret = ccw_device_offline(cdev);
393 spin_unlock_irq(cdev->ccwlock);
394 if (ret == 0)
395 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
396 else
397 pr_debug("ccw_device_offline returned %d, device %s\n",
398 ret, cdev->dev.bus_id);
Cornelia Huck6cadb782006-02-17 13:52:49 -0800399 return (ret == 0) ? -ENODEV : ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200402static void online_store_handle_offline(struct ccw_device *cdev)
403{
404 if (cdev->private->state == DEV_STATE_DISCONNECTED)
405 ccw_device_remove_disconnected(cdev);
406 else if (cdev->drv && cdev->drv->set_offline)
407 ccw_device_set_offline(cdev);
408}
409
410static int online_store_recog_and_online(struct ccw_device *cdev)
411{
412 int ret;
413
414 /* Do device recognition, if needed. */
415 if (cdev->id.cu_type == 0) {
416 ret = ccw_device_recognition(cdev);
417 if (ret) {
418 printk(KERN_WARNING"Couldn't start recognition "
419 "for device %s (ret=%d)\n",
420 cdev->dev.bus_id, ret);
421 return ret;
422 }
423 wait_event(cdev->private->wait_q,
424 cdev->private->flags.recog_done);
425 }
426 if (cdev->drv && cdev->drv->set_online)
427 ccw_device_set_online(cdev);
428 return 0;
429}
430static void online_store_handle_online(struct ccw_device *cdev, int force)
431{
432 int ret;
433
434 ret = online_store_recog_and_online(cdev);
435 if (ret)
436 return;
437 if (force && cdev->private->state == DEV_STATE_BOXED) {
438 ret = ccw_device_stlck(cdev);
439 if (ret) {
440 printk(KERN_WARNING"ccw_device_stlck for device %s "
441 "returned %d!\n", cdev->dev.bus_id, ret);
442 return;
443 }
444 if (cdev->id.cu_type == 0)
445 cdev->private->state = DEV_STATE_NOT_OPER;
446 online_store_recog_and_online(cdev);
447 }
448
449}
450
451static ssize_t online_store (struct device *dev, struct device_attribute *attr,
452 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
454 struct ccw_device *cdev = to_ccwdev(dev);
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200455 int i, force;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 char *tmp;
457
Martin Schwidefsky973bd992006-01-06 00:19:07 -0800458 if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 return -EAGAIN;
460
461 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
462 atomic_set(&cdev->private->onoff, 0);
463 return -EINVAL;
464 }
465 if (!strncmp(buf, "force\n", count)) {
466 force = 1;
467 i = 1;
468 } else {
469 force = 0;
470 i = simple_strtoul(buf, &tmp, 16);
471 }
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200472
473 switch (i) {
474 case 0:
475 online_store_handle_offline(cdev);
476 break;
477 case 1:
478 online_store_handle_online(cdev, force);
479 break;
480 default:
481 count = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 if (cdev->drv)
484 module_put(cdev->drv->owner);
485 atomic_set(&cdev->private->onoff, 0);
486 return count;
487}
488
489static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400490available_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491{
492 struct ccw_device *cdev = to_ccwdev(dev);
493 struct subchannel *sch;
494
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100495 if (ccw_device_is_orphan(cdev))
496 return sprintf(buf, "no device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 switch (cdev->private->state) {
498 case DEV_STATE_BOXED:
499 return sprintf(buf, "boxed\n");
500 case DEV_STATE_DISCONNECTED:
501 case DEV_STATE_DISCONNECTED_SENSE_ID:
502 case DEV_STATE_NOT_OPER:
503 sch = to_subchannel(dev->parent);
504 if (!sch->lpm)
505 return sprintf(buf, "no path\n");
506 else
507 return sprintf(buf, "no device\n");
508 default:
509 /* All other states considered fine. */
510 return sprintf(buf, "good\n");
511 }
512}
513
514static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
515static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
516static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
517static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800518static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519static DEVICE_ATTR(online, 0644, online_show, online_store);
520extern struct device_attribute dev_attr_cmb_enable;
521static DEVICE_ATTR(availability, 0444, available_show, NULL);
522
523static struct attribute * subch_attrs[] = {
524 &dev_attr_chpids.attr,
525 &dev_attr_pimpampom.attr,
526 NULL,
527};
528
529static struct attribute_group subch_attr_group = {
530 .attrs = subch_attrs,
531};
532
Cornelia Huck529192f2006-12-08 15:55:57 +0100533struct attribute_group *subch_attr_groups[] = {
534 &subch_attr_group,
535 NULL,
536};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
538static struct attribute * ccwdev_attrs[] = {
539 &dev_attr_devtype.attr,
540 &dev_attr_cutype.attr,
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800541 &dev_attr_modalias.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 &dev_attr_online.attr,
543 &dev_attr_cmb_enable.attr,
544 &dev_attr_availability.attr,
545 NULL,
546};
547
548static struct attribute_group ccwdev_attr_group = {
549 .attrs = ccwdev_attrs,
550};
551
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100552static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553device_add_files (struct device *dev)
554{
555 return sysfs_create_group(&dev->kobj, &ccwdev_attr_group);
556}
557
Heiko Carstens4d284ca2007-02-05 21:18:53 +0100558static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559device_remove_files(struct device *dev)
560{
561 sysfs_remove_group(&dev->kobj, &ccwdev_attr_group);
562}
563
564/* this is a simple abstraction for device_register that sets the
565 * correct bus type and adds the bus specific files */
Cornelia Huck3c9da7b2006-10-27 12:39:33 +0200566static int ccw_device_register(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
568 struct device *dev = &cdev->dev;
569 int ret;
570
571 dev->bus = &ccw_bus_type;
572
573 if ((ret = device_add(dev)))
574 return ret;
575
576 set_bit(1, &cdev->private->registered);
577 if ((ret = device_add_files(dev))) {
578 if (test_and_clear_bit(1, &cdev->private->registered))
579 device_del(dev);
580 }
581 return ret;
582}
583
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700584struct match_data {
Cornelia Huck78964262006-10-11 15:31:38 +0200585 struct ccw_dev_id dev_id;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700586 struct ccw_device * sibling;
587};
588
589static int
590match_devno(struct device * dev, void * data)
591{
Cornelia Huck78964262006-10-11 15:31:38 +0200592 struct match_data * d = data;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700593 struct ccw_device * cdev;
594
595 cdev = to_ccwdev(dev);
596 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100597 !ccw_device_is_orphan(cdev) &&
Cornelia Huck78964262006-10-11 15:31:38 +0200598 ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100599 (cdev != d->sibling))
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700600 return 1;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700601 return 0;
602}
603
Cornelia Huck78964262006-10-11 15:31:38 +0200604static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
605 struct ccw_device *sibling)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 struct device *dev;
Heiko Carstens292888c2006-08-30 14:33:35 +0200608 struct match_data data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Cornelia Huck78964262006-10-11 15:31:38 +0200610 data.dev_id = *dev_id;
Heiko Carstens292888c2006-08-30 14:33:35 +0200611 data.sibling = sibling;
Cornelia Hucke5945b42005-10-11 08:28:59 -0700612 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700614 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615}
616
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100617static int match_orphan(struct device *dev, void *data)
618{
619 struct ccw_dev_id *dev_id;
620 struct ccw_device *cdev;
621
622 dev_id = data;
623 cdev = to_ccwdev(dev);
624 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
625}
626
627static struct ccw_device *
628get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
629 struct ccw_dev_id *dev_id)
630{
631 struct device *dev;
632
633 dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
634 match_orphan);
635
636 return dev ? to_ccwdev(dev) : NULL;
637}
638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639static void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100640ccw_device_add_changed(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100642 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 struct ccw_device *cdev;
644
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100645 priv = container_of(work, struct ccw_device_private, kick_work);
646 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 if (device_add(&cdev->dev)) {
648 put_device(&cdev->dev);
649 return;
650 }
651 set_bit(1, &cdev->private->registered);
652 if (device_add_files(&cdev->dev)) {
653 if (test_and_clear_bit(1, &cdev->private->registered))
654 device_unregister(&cdev->dev);
655 }
656}
657
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100658void ccw_device_do_unreg_rereg(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100660 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 struct ccw_device *cdev;
662 struct subchannel *sch;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100664 priv = container_of(work, struct ccw_device_private, kick_work);
665 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 sch = to_subchannel(cdev->dev.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 device_remove_files(&cdev->dev);
669 if (test_and_clear_bit(1, &cdev->private->registered))
670 device_del(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100672 ccw_device_add_changed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 queue_work(ccw_device_work, &cdev->private->kick_work);
674}
675
676static void
677ccw_device_release(struct device *dev)
678{
679 struct ccw_device *cdev;
680
681 cdev = to_ccwdev(dev);
682 kfree(cdev->private);
683 kfree(cdev);
684}
685
Cornelia Huck7674da72006-12-08 15:54:21 +0100686static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
687{
688 struct ccw_device *cdev;
689
690 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
691 if (cdev) {
692 cdev->private = kzalloc(sizeof(struct ccw_device_private),
693 GFP_KERNEL | GFP_DMA);
694 if (cdev->private)
695 return cdev;
696 }
697 kfree(cdev);
698 return ERR_PTR(-ENOMEM);
699}
700
701static int io_subchannel_initialize_dev(struct subchannel *sch,
702 struct ccw_device *cdev)
703{
704 cdev->private->cdev = cdev;
705 atomic_set(&cdev->private->onoff, 0);
706 cdev->dev.parent = &sch->dev;
707 cdev->dev.release = ccw_device_release;
708 INIT_LIST_HEAD(&cdev->private->kick_work.entry);
709 /* Do first half of device_register. */
710 device_initialize(&cdev->dev);
711 if (!get_device(&sch->dev)) {
712 if (cdev->dev.release)
713 cdev->dev.release(&cdev->dev);
714 return -ENODEV;
715 }
716 return 0;
717}
718
719static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
720{
721 struct ccw_device *cdev;
722 int ret;
723
724 cdev = io_subchannel_allocate_dev(sch);
725 if (!IS_ERR(cdev)) {
726 ret = io_subchannel_initialize_dev(sch, cdev);
727 if (ret) {
728 kfree(cdev);
729 cdev = ERR_PTR(ret);
730 }
731 }
732 return cdev;
733}
734
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +0100735static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
736
737static void sch_attach_device(struct subchannel *sch,
738 struct ccw_device *cdev)
739{
740 spin_lock_irq(sch->lock);
741 sch->dev.driver_data = cdev;
742 cdev->private->schid = sch->schid;
743 cdev->ccwlock = sch->lock;
744 device_trigger_reprobe(sch);
745 spin_unlock_irq(sch->lock);
746}
747
748static void sch_attach_disconnected_device(struct subchannel *sch,
749 struct ccw_device *cdev)
750{
751 struct subchannel *other_sch;
752 int ret;
753
754 other_sch = to_subchannel(get_device(cdev->dev.parent));
755 ret = device_move(&cdev->dev, &sch->dev);
756 if (ret) {
757 CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
758 "(ret=%d)!\n", cdev->private->dev_id.ssid,
759 cdev->private->dev_id.devno, ret);
760 put_device(&other_sch->dev);
761 return;
762 }
763 other_sch->dev.driver_data = NULL;
764 /* No need to keep a subchannel without ccw device around. */
765 css_sch_device_unregister(other_sch);
766 put_device(&other_sch->dev);
767 sch_attach_device(sch, cdev);
768}
769
770static void sch_attach_orphaned_device(struct subchannel *sch,
771 struct ccw_device *cdev)
772{
773 int ret;
774
775 /* Try to move the ccw device to its new subchannel. */
776 ret = device_move(&cdev->dev, &sch->dev);
777 if (ret) {
778 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
779 "failed (ret=%d)!\n",
780 cdev->private->dev_id.ssid,
781 cdev->private->dev_id.devno, ret);
782 return;
783 }
784 sch_attach_device(sch, cdev);
785}
786
787static void sch_create_and_recog_new_device(struct subchannel *sch)
788{
789 struct ccw_device *cdev;
790
791 /* Need to allocate a new ccw device. */
792 cdev = io_subchannel_create_ccwdev(sch);
793 if (IS_ERR(cdev)) {
794 /* OK, we did everything we could... */
795 css_sch_device_unregister(sch);
796 return;
797 }
798 spin_lock_irq(sch->lock);
799 sch->dev.driver_data = cdev;
800 spin_unlock_irq(sch->lock);
801 /* Start recognition for the new ccw device. */
802 if (io_subchannel_recog(cdev, sch)) {
803 spin_lock_irq(sch->lock);
804 sch->dev.driver_data = NULL;
805 spin_unlock_irq(sch->lock);
806 if (cdev->dev.release)
807 cdev->dev.release(&cdev->dev);
808 css_sch_device_unregister(sch);
809 }
810}
811
812
813void ccw_device_move_to_orphanage(struct work_struct *work)
814{
815 struct ccw_device_private *priv;
816 struct ccw_device *cdev;
817 struct ccw_device *replacing_cdev;
818 struct subchannel *sch;
819 int ret;
820 struct channel_subsystem *css;
821 struct ccw_dev_id dev_id;
822
823 priv = container_of(work, struct ccw_device_private, kick_work);
824 cdev = priv->cdev;
825 sch = to_subchannel(cdev->dev.parent);
826 css = to_css(sch->dev.parent);
827 dev_id.devno = sch->schib.pmcw.dev;
828 dev_id.ssid = sch->schid.ssid;
829
830 /*
831 * Move the orphaned ccw device to the orphanage so the replacing
832 * ccw device can take its place on the subchannel.
833 */
834 ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
835 if (ret) {
836 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
837 "(ret=%d)!\n", cdev->private->dev_id.ssid,
838 cdev->private->dev_id.devno, ret);
839 return;
840 }
841 cdev->ccwlock = css->pseudo_subchannel->lock;
842 /*
843 * Search for the replacing ccw device
844 * - among the disconnected devices
845 * - in the orphanage
846 */
847 replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
848 if (replacing_cdev) {
849 sch_attach_disconnected_device(sch, replacing_cdev);
850 return;
851 }
852 replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
853 if (replacing_cdev) {
854 sch_attach_orphaned_device(sch, replacing_cdev);
855 return;
856 }
857 sch_create_and_recog_new_device(sch);
858}
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860/*
861 * Register recognized device.
862 */
863static void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100864io_subchannel_register(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100866 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 struct ccw_device *cdev;
868 struct subchannel *sch;
869 int ret;
870 unsigned long flags;
871
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100872 priv = container_of(work, struct ccw_device_private, kick_work);
873 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 sch = to_subchannel(cdev->dev.parent);
875
Cornelia Huck47af5512006-12-04 15:41:07 +0100876 /*
877 * io_subchannel_register() will also be called after device
878 * recognition has been done for a boxed device (which will already
879 * be registered). We need to reprobe since we may now have sense id
880 * information.
881 */
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700882 if (klist_node_attached(&cdev->dev.knode_parent)) {
Cornelia Huck47af5512006-12-04 15:41:07 +0100883 if (!cdev->drv) {
884 ret = device_reprobe(&cdev->dev);
885 if (ret)
886 /* We can't do much here. */
887 dev_info(&cdev->dev, "device_reprobe() returned"
888 " %d\n", ret);
889 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 goto out;
891 }
892 /* make it known to the system */
893 ret = ccw_device_register(cdev);
894 if (ret) {
895 printk (KERN_WARNING "%s: could not register %s\n",
896 __func__, cdev->dev.bus_id);
897 put_device(&cdev->dev);
Cornelia Huck2ec22982006-12-08 15:54:26 +0100898 spin_lock_irqsave(sch->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 sch->dev.driver_data = NULL;
Cornelia Huck2ec22982006-12-08 15:54:26 +0100900 spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 kfree (cdev->private);
902 kfree (cdev);
903 put_device(&sch->dev);
904 if (atomic_dec_and_test(&ccw_device_init_count))
905 wake_up(&ccw_device_init_wq);
906 return;
907 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 put_device(&cdev->dev);
909out:
910 cdev->private->flags.recog_done = 1;
911 put_device(&sch->dev);
912 wake_up(&cdev->private->wait_q);
913 if (atomic_dec_and_test(&ccw_device_init_count))
914 wake_up(&ccw_device_init_wq);
915}
916
917void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100918ccw_device_call_sch_unregister(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100920 struct ccw_device_private *priv;
921 struct ccw_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 struct subchannel *sch;
923
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100924 priv = container_of(work, struct ccw_device_private, kick_work);
925 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck6ab48792006-07-12 16:39:50 +0200927 css_sch_device_unregister(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 /* Reset intparm to zeroes. */
929 sch->schib.pmcw.intparm = 0;
930 cio_modify(sch);
931 put_device(&cdev->dev);
932 put_device(&sch->dev);
933}
934
935/*
936 * subchannel recognition done. Called from the state machine.
937 */
938void
939io_subchannel_recog_done(struct ccw_device *cdev)
940{
941 struct subchannel *sch;
942
943 if (css_init_done == 0) {
944 cdev->private->flags.recog_done = 1;
945 return;
946 }
947 switch (cdev->private->state) {
948 case DEV_STATE_NOT_OPER:
949 cdev->private->flags.recog_done = 1;
950 /* Remove device found not operational. */
951 if (!get_device(&cdev->dev))
952 break;
953 sch = to_subchannel(cdev->dev.parent);
954 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100955 ccw_device_call_sch_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 queue_work(slow_path_wq, &cdev->private->kick_work);
957 if (atomic_dec_and_test(&ccw_device_init_count))
958 wake_up(&ccw_device_init_wq);
959 break;
960 case DEV_STATE_BOXED:
961 /* Device did not respond in time. */
962 case DEV_STATE_OFFLINE:
963 /*
964 * We can't register the device in interrupt context so
965 * we schedule a work item.
966 */
967 if (!get_device(&cdev->dev))
968 break;
969 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100970 io_subchannel_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 queue_work(slow_path_wq, &cdev->private->kick_work);
972 break;
973 }
974}
975
976static int
977io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
978{
979 int rc;
980 struct ccw_device_private *priv;
981
982 sch->dev.driver_data = cdev;
983 sch->driver = &io_subchannel_driver;
Cornelia Huck2ec22982006-12-08 15:54:26 +0100984 cdev->ccwlock = sch->lock;
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 /* Init private data. */
987 priv = cdev->private;
Cornelia Huck78964262006-10-11 15:31:38 +0200988 priv->dev_id.devno = sch->schib.pmcw.dev;
989 priv->dev_id.ssid = sch->schid.ssid;
990 priv->schid = sch->schid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 priv->state = DEV_STATE_NOT_OPER;
992 INIT_LIST_HEAD(&priv->cmb_list);
993 init_waitqueue_head(&priv->wait_q);
994 init_timer(&priv->timer);
995
996 /* Set an initial name for the device. */
Cornelia Huckfb6958a2006-01-06 00:19:25 -0800997 snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
998 sch->schid.ssid, sch->schib.pmcw.dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 /* Increase counter of devices currently in recognition. */
1001 atomic_inc(&ccw_device_init_count);
1002
1003 /* Start async. device sensing. */
Cornelia Huck2ec22982006-12-08 15:54:26 +01001004 spin_lock_irq(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 rc = ccw_device_recognition(cdev);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001006 spin_unlock_irq(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 if (rc) {
1008 if (atomic_dec_and_test(&ccw_device_init_count))
1009 wake_up(&ccw_device_init_wq);
1010 }
1011 return rc;
1012}
1013
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +01001014static void ccw_device_move_to_sch(struct work_struct *work)
1015{
1016 struct ccw_device_private *priv;
1017 int rc;
1018 struct subchannel *sch;
1019 struct ccw_device *cdev;
1020 struct subchannel *former_parent;
1021
1022 priv = container_of(work, struct ccw_device_private, kick_work);
1023 sch = priv->sch;
1024 cdev = priv->cdev;
1025 former_parent = ccw_device_is_orphan(cdev) ?
1026 NULL : to_subchannel(get_device(cdev->dev.parent));
1027 mutex_lock(&sch->reg_mutex);
1028 /* Try to move the ccw device to its new subchannel. */
1029 rc = device_move(&cdev->dev, &sch->dev);
1030 mutex_unlock(&sch->reg_mutex);
1031 if (rc) {
1032 CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
1033 "0.%x.%04x failed (ret=%d)!\n",
1034 cdev->private->dev_id.ssid,
1035 cdev->private->dev_id.devno, sch->schid.ssid,
1036 sch->schid.sch_no, rc);
1037 css_sch_device_unregister(sch);
1038 goto out;
1039 }
1040 if (former_parent) {
1041 spin_lock_irq(former_parent->lock);
1042 former_parent->dev.driver_data = NULL;
1043 spin_unlock_irq(former_parent->lock);
1044 css_sch_device_unregister(former_parent);
1045 /* Reset intparm to zeroes. */
1046 former_parent->schib.pmcw.intparm = 0;
1047 cio_modify(former_parent);
1048 }
1049 sch_attach_device(sch, cdev);
1050out:
1051 if (former_parent)
1052 put_device(&former_parent->dev);
1053 put_device(&cdev->dev);
1054}
1055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056static int
Cornelia Huck8bbace72006-01-11 10:56:22 +01001057io_subchannel_probe (struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 struct ccw_device *cdev;
1060 int rc;
1061 unsigned long flags;
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +01001062 struct ccw_dev_id dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 if (sch->dev.driver_data) {
1065 /*
1066 * This subchannel already has an associated ccw_device.
1067 * Register it and exit. This happens for all early
1068 * device, e.g. the console.
1069 */
1070 cdev = sch->dev.driver_data;
1071 device_initialize(&cdev->dev);
1072 ccw_device_register(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 /*
1074 * Check if the device is already online. If it is
1075 * the reference count needs to be corrected
1076 * (see ccw_device_online and css_init_done for the
1077 * ugly details).
1078 */
1079 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1080 cdev->private->state != DEV_STATE_OFFLINE &&
1081 cdev->private->state != DEV_STATE_BOXED)
1082 get_device(&cdev->dev);
1083 return 0;
1084 }
Cornelia Huckd7b5a4c92006-12-08 15:54:28 +01001085 /*
1086 * First check if a fitting device may be found amongst the
1087 * disconnected devices or in the orphanage.
1088 */
1089 dev_id.devno = sch->schib.pmcw.dev;
1090 dev_id.ssid = sch->schid.ssid;
1091 cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1092 if (!cdev)
1093 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1094 &dev_id);
1095 if (cdev) {
1096 /*
1097 * Schedule moving the device until when we have a registered
1098 * subchannel to move to and succeed the probe. We can
1099 * unregister later again, when the probe is through.
1100 */
1101 cdev->private->sch = sch;
1102 PREPARE_WORK(&cdev->private->kick_work,
1103 ccw_device_move_to_sch);
1104 queue_work(slow_path_wq, &cdev->private->kick_work);
1105 return 0;
1106 }
Cornelia Huck7674da72006-12-08 15:54:21 +01001107 cdev = io_subchannel_create_ccwdev(sch);
1108 if (IS_ERR(cdev))
1109 return PTR_ERR(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Cornelia Huck8bbace72006-01-11 10:56:22 +01001111 rc = io_subchannel_recog(cdev, sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 if (rc) {
Cornelia Huck2ec22982006-12-08 15:54:26 +01001113 spin_lock_irqsave(sch->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 sch->dev.driver_data = NULL;
Cornelia Huck2ec22982006-12-08 15:54:26 +01001115 spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 if (cdev->dev.release)
1117 cdev->dev.release(&cdev->dev);
1118 }
1119
1120 return rc;
1121}
1122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123static int
Cornelia Huck8bbace72006-01-11 10:56:22 +01001124io_subchannel_remove (struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125{
1126 struct ccw_device *cdev;
1127 unsigned long flags;
1128
Cornelia Huck8bbace72006-01-11 10:56:22 +01001129 if (!sch->dev.driver_data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 return 0;
Cornelia Huck8bbace72006-01-11 10:56:22 +01001131 cdev = sch->dev.driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 /* Set ccw device to not operational and drop reference. */
1133 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huck8bbace72006-01-11 10:56:22 +01001134 sch->dev.driver_data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 cdev->private->state = DEV_STATE_NOT_OPER;
1136 spin_unlock_irqrestore(cdev->ccwlock, flags);
1137 /*
1138 * Put unregistration on workqueue to avoid livelocks on the css bus
1139 * semaphore.
1140 */
1141 if (get_device(&cdev->dev)) {
1142 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001143 ccw_device_unregister);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 queue_work(ccw_device_work, &cdev->private->kick_work);
1145 }
1146 return 0;
1147}
1148
1149static int
1150io_subchannel_notify(struct device *dev, int event)
1151{
1152 struct ccw_device *cdev;
1153
1154 cdev = dev->driver_data;
1155 if (!cdev)
1156 return 0;
1157 if (!cdev->drv)
1158 return 0;
1159 if (!cdev->online)
1160 return 0;
1161 return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
1162}
1163
1164static void
1165io_subchannel_verify(struct device *dev)
1166{
1167 struct ccw_device *cdev;
1168
1169 cdev = dev->driver_data;
1170 if (cdev)
1171 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1172}
1173
1174static void
1175io_subchannel_ioterm(struct device *dev)
1176{
1177 struct ccw_device *cdev;
1178
1179 cdev = dev->driver_data;
1180 if (!cdev)
1181 return;
Cornelia Huckd23861f2006-12-04 15:41:04 +01001182 /* Internal I/O will be retried by the interrupt handler. */
1183 if (cdev->private->flags.intretry)
1184 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1186 if (cdev->handler)
1187 cdev->handler(cdev, cdev->private->intparm,
1188 ERR_PTR(-EIO));
1189}
1190
1191static void
Cornelia Huck8bbace72006-01-11 10:56:22 +01001192io_subchannel_shutdown(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 struct ccw_device *cdev;
1195 int ret;
1196
Cornelia Huck8bbace72006-01-11 10:56:22 +01001197 cdev = sch->dev.driver_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001199 if (cio_is_console(sch->schid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 return;
1201 if (!sch->schib.pmcw.ena)
1202 /* Nothing to do. */
1203 return;
1204 ret = cio_disable_subchannel(sch);
1205 if (ret != -EBUSY)
1206 /* Subchannel is disabled, we're done. */
1207 return;
1208 cdev->private->state = DEV_STATE_QUIESCE;
1209 if (cdev->handler)
1210 cdev->handler(cdev, cdev->private->intparm,
1211 ERR_PTR(-EIO));
1212 ret = ccw_device_cancel_halt_clear(cdev);
1213 if (ret == -EBUSY) {
1214 ccw_device_set_timeout(cdev, HZ/10);
1215 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1216 }
1217 cio_disable_subchannel(sch);
1218}
1219
1220#ifdef CONFIG_CCW_CONSOLE
1221static struct ccw_device console_cdev;
1222static struct ccw_device_private console_private;
1223static int console_cdev_in_use;
1224
Cornelia Huck2ec22982006-12-08 15:54:26 +01001225static DEFINE_SPINLOCK(ccw_console_lock);
1226
1227spinlock_t * cio_get_console_lock(void)
1228{
1229 return &ccw_console_lock;
1230}
1231
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232static int
1233ccw_device_console_enable (struct ccw_device *cdev, struct subchannel *sch)
1234{
1235 int rc;
1236
1237 /* Initialize the ccw_device structure. */
Heiko Carstens292888c2006-08-30 14:33:35 +02001238 cdev->dev.parent= &sch->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 rc = io_subchannel_recog(cdev, sch);
1240 if (rc)
1241 return rc;
1242
1243 /* Now wait for the async. recognition to come to an end. */
1244 spin_lock_irq(cdev->ccwlock);
1245 while (!dev_fsm_final_state(cdev))
1246 wait_cons_dev();
1247 rc = -EIO;
1248 if (cdev->private->state != DEV_STATE_OFFLINE)
1249 goto out_unlock;
1250 ccw_device_online(cdev);
1251 while (!dev_fsm_final_state(cdev))
1252 wait_cons_dev();
1253 if (cdev->private->state != DEV_STATE_ONLINE)
1254 goto out_unlock;
1255 rc = 0;
1256out_unlock:
1257 spin_unlock_irq(cdev->ccwlock);
1258 return 0;
1259}
1260
1261struct ccw_device *
1262ccw_device_probe_console(void)
1263{
1264 struct subchannel *sch;
1265 int ret;
1266
1267 if (xchg(&console_cdev_in_use, 1) != 0)
Peter Oberparleiter600b5d12006-02-01 03:06:35 -08001268 return ERR_PTR(-EBUSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269 sch = cio_probe_console();
1270 if (IS_ERR(sch)) {
1271 console_cdev_in_use = 0;
1272 return (void *) sch;
1273 }
1274 memset(&console_cdev, 0, sizeof(struct ccw_device));
1275 memset(&console_private, 0, sizeof(struct ccw_device_private));
1276 console_cdev.private = &console_private;
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001277 console_private.cdev = &console_cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 ret = ccw_device_console_enable(&console_cdev, sch);
1279 if (ret) {
1280 cio_release_console();
1281 console_cdev_in_use = 0;
1282 return ERR_PTR(ret);
1283 }
1284 console_cdev.online = 1;
1285 return &console_cdev;
1286}
1287#endif
1288
1289/*
1290 * get ccw_device matching the busid, but only if owned by cdrv
1291 */
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001292static int
1293__ccwdev_check_busid(struct device *dev, void *id)
1294{
1295 char *bus_id;
1296
Cornelia Huck12975ae2006-10-11 15:31:47 +02001297 bus_id = id;
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001298
1299 return (strncmp(bus_id, dev->bus_id, BUS_ID_SIZE) == 0);
1300}
1301
1302
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303struct ccw_device *
1304get_ccwdev_by_busid(struct ccw_driver *cdrv, const char *bus_id)
1305{
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001306 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 struct device_driver *drv;
1308
1309 drv = get_driver(&cdrv->driver);
1310 if (!drv)
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001311 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001313 dev = driver_find_device(drv, NULL, (void *)bus_id,
1314 __ccwdev_check_busid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 put_driver(drv);
1316
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001317 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318}
1319
1320/************************** device driver handling ************************/
1321
1322/* This is the implementation of the ccw_driver class. The probe, remove
1323 * and release methods are initially very similar to the device_driver
1324 * implementations, with the difference that they have ccw_device
1325 * arguments.
1326 *
1327 * A ccw driver also contains the information that is needed for
1328 * device matching.
1329 */
1330static int
1331ccw_device_probe (struct device *dev)
1332{
1333 struct ccw_device *cdev = to_ccwdev(dev);
1334 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1335 int ret;
1336
1337 cdev->drv = cdrv; /* to let the driver call _set_online */
1338
1339 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1340
1341 if (ret) {
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001342 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 return ret;
1344 }
1345
1346 return 0;
1347}
1348
1349static int
1350ccw_device_remove (struct device *dev)
1351{
1352 struct ccw_device *cdev = to_ccwdev(dev);
1353 struct ccw_driver *cdrv = cdev->drv;
1354 int ret;
1355
1356 pr_debug("removing device %s\n", cdev->dev.bus_id);
1357 if (cdrv->remove)
1358 cdrv->remove(cdev);
1359 if (cdev->online) {
1360 cdev->online = 0;
1361 spin_lock_irq(cdev->ccwlock);
1362 ret = ccw_device_offline(cdev);
1363 spin_unlock_irq(cdev->ccwlock);
1364 if (ret == 0)
1365 wait_event(cdev->private->wait_q,
1366 dev_fsm_final_state(cdev));
1367 else
1368 //FIXME: we can't fail!
1369 pr_debug("ccw_device_offline returned %d, device %s\n",
1370 ret, cdev->dev.bus_id);
1371 }
1372 ccw_device_set_timeout(cdev, 0);
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001373 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 return 0;
1375}
1376
Cornelia Huck8bbace72006-01-11 10:56:22 +01001377struct bus_type ccw_bus_type = {
1378 .name = "ccw",
1379 .match = ccw_bus_match,
1380 .uevent = ccw_uevent,
1381 .probe = ccw_device_probe,
1382 .remove = ccw_device_remove,
1383};
1384
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385int
1386ccw_driver_register (struct ccw_driver *cdriver)
1387{
1388 struct device_driver *drv = &cdriver->driver;
1389
1390 drv->bus = &ccw_bus_type;
1391 drv->name = cdriver->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
1393 return driver_register(drv);
1394}
1395
1396void
1397ccw_driver_unregister (struct ccw_driver *cdriver)
1398{
1399 driver_unregister(&cdriver->driver);
1400}
1401
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001402/* Helper func for qdio. */
1403struct subchannel_id
1404ccw_device_get_subchannel_id(struct ccw_device *cdev)
1405{
1406 struct subchannel *sch;
1407
1408 sch = to_subchannel(cdev->dev.parent);
1409 return sch->schid;
1410}
1411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412MODULE_LICENSE("GPL");
1413EXPORT_SYMBOL(ccw_device_set_online);
1414EXPORT_SYMBOL(ccw_device_set_offline);
1415EXPORT_SYMBOL(ccw_driver_register);
1416EXPORT_SYMBOL(ccw_driver_unregister);
1417EXPORT_SYMBOL(get_ccwdev_by_busid);
1418EXPORT_SYMBOL(ccw_bus_type);
1419EXPORT_SYMBOL(ccw_device_work);
1420EXPORT_SYMBOL(ccw_device_notify_work);
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001421EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);