blob: 2490b741e16a25e28f4e30755ef002baede385b1 [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 *
Cornelia Huckc820de32008-07-14 09:58:45 +02005 * Copyright IBM Corp. 2002,2008
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
Cornelia Huck4ce3b302006-01-14 13:21:04 -08007 * Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/spinlock.h>
13#include <linux/errno.h>
14#include <linux/err.h>
15#include <linux/slab.h>
16#include <linux/list.h>
17#include <linux/device.h>
18#include <linux/workqueue.h>
Peter Oberparleiter90ab1332008-01-26 14:10:52 +010019#include <linux/timer.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21#include <asm/ccwdev.h>
22#include <asm/cio.h>
Tim Schmielau4e57b682005-10-30 15:03:48 -080023#include <asm/param.h> /* HZ */
Cornelia Huck1842f2b2007-10-12 16:11:22 +020024#include <asm/cmb.h>
Cornelia Huck3a3fc292008-07-14 09:58:58 +020025#include <asm/isc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +020027#include "chp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "cio.h"
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +010029#include "cio_debug.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "css.h"
31#include "device.h"
32#include "ioasm.h"
Cornelia Huckcd6b4f22008-01-26 14:10:43 +010033#include "io_sch.h"
Peter Oberparleiterecf5d9e2008-10-10 21:33:06 +020034#include "blacklist.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Peter Oberparleiter90ab1332008-01-26 14:10:52 +010036static struct timer_list recovery_timer;
Cornelia Huck486d0a02008-02-19 15:29:23 +010037static DEFINE_SPINLOCK(recovery_lock);
Peter Oberparleiter90ab1332008-01-26 14:10:52 +010038static int recovery_phase;
39static const unsigned long recovery_delay[] = { 3, 30, 300 };
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/******************* bus type handling ***********************/
42
43/* The Linux driver model distinguishes between a bus type and
44 * the bus itself. Of course we only have one channel
45 * subsystem driver and one channel system per machine, but
46 * we still use the abstraction. T.R. says it's a good idea. */
47static int
48ccw_bus_match (struct device * dev, struct device_driver * drv)
49{
50 struct ccw_device *cdev = to_ccwdev(dev);
51 struct ccw_driver *cdrv = to_ccwdrv(drv);
52 const struct ccw_device_id *ids = cdrv->ids, *found;
53
54 if (!ids)
55 return 0;
56
57 found = ccw_device_id_match(ids, &cdev->id);
58 if (!found)
59 return 0;
60
61 cdev->id.driver_info = found->driver_info;
62
63 return 1;
64}
65
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020066/* Store modalias string delimited by prefix/suffix string into buffer with
67 * specified size. Return length of resulting string (excluding trailing '\0')
68 * even if string doesn't fit buffer (snprintf semantics). */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020069static int snprint_alias(char *buf, size_t size,
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020070 struct ccw_device_id *id, const char *suffix)
71{
72 int len;
73
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020074 len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020075 if (len > size)
76 return len;
77 buf += len;
78 size -= len;
79
80 if (id->dev_type != 0)
81 len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
82 id->dev_model, suffix);
83 else
84 len += snprintf(buf, size, "dtdm%s", suffix);
85
86 return len;
87}
88
89/* Set up environment variables for ccw device uevent. Return 0 on success,
90 * non-zero otherwise. */
Kay Sievers7eff2e72007-08-14 15:15:12 +020091static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 struct ccw_device *cdev = to_ccwdev(dev);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020094 struct ccw_device_id *id = &(cdev->id);
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +020095 int ret;
96 char modalias_buf[30];
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +020098 /* CU_TYPE= */
Kay Sievers7eff2e72007-08-14 15:15:12 +020099 ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200100 if (ret)
101 return ret;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200102
103 /* CU_MODEL= */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200104 ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200105 if (ret)
106 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108 /* The next two can be zero, that's ok for us */
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200109 /* DEV_TYPE= */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200110 ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200111 if (ret)
112 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200114 /* DEV_MODEL= */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200115 ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200116 if (ret)
117 return ret;
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200118
119 /* MODALIAS= */
Cornelia Huckcfbe9bb2007-04-27 16:01:32 +0200120 snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
Kay Sievers7eff2e72007-08-14 15:15:12 +0200121 ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
122 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123}
124
Cornelia Huck8bbace72006-01-11 10:56:22 +0100125struct bus_type ccw_bus_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Cornelia Huck602b20f2008-01-26 14:10:39 +0100127static void io_subchannel_irq(struct subchannel *);
128static int io_subchannel_probe(struct subchannel *);
129static int io_subchannel_remove(struct subchannel *);
Cornelia Huck8bbace72006-01-11 10:56:22 +0100130static void io_subchannel_shutdown(struct subchannel *);
Cornelia Huckc820de32008-07-14 09:58:45 +0200131static int io_subchannel_sch_event(struct subchannel *, int);
Cornelia Huck99611f82008-07-14 09:59:02 +0200132static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
133 int);
Sebastian Ott8ea7f552009-09-22 22:58:35 +0200134static void recovery_func(unsigned long data);
135struct workqueue_struct *ccw_device_work;
136wait_queue_head_t ccw_device_init_wq;
137atomic_t ccw_device_init_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
Cornelia Huckf08adc02008-07-14 09:59:03 +0200139static struct css_device_id io_subchannel_ids[] = {
140 { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
141 { /* end of list */ },
142};
143MODULE_DEVICE_TABLE(css, io_subchannel_ids);
144
Cornelia Huck93a27592009-06-16 10:30:23 +0200145static int io_subchannel_prepare(struct subchannel *sch)
146{
147 struct ccw_device *cdev;
148 /*
149 * Don't allow suspend while a ccw device registration
150 * is still outstanding.
151 */
152 cdev = sch_get_cdev(sch);
153 if (cdev && !device_is_registered(&cdev->dev))
154 return -EAGAIN;
155 return 0;
156}
157
Sebastian Ott8ea7f552009-09-22 22:58:35 +0200158static void io_subchannel_settle(void)
159{
160 wait_event(ccw_device_init_wq,
161 atomic_read(&ccw_device_init_count) == 0);
162 flush_workqueue(ccw_device_work);
163}
164
Cornelia Huckf7e5d672007-05-10 15:45:43 +0200165static struct css_driver io_subchannel_driver = {
Cornelia Huck4beee642008-01-26 14:10:47 +0100166 .owner = THIS_MODULE,
Cornelia Huckf08adc02008-07-14 09:59:03 +0200167 .subchannel_type = io_subchannel_ids,
Cornelia Huck25b7bb52008-01-26 14:10:41 +0100168 .name = "io_subchannel",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 .irq = io_subchannel_irq,
Cornelia Huckc820de32008-07-14 09:58:45 +0200170 .sch_event = io_subchannel_sch_event,
171 .chp_event = io_subchannel_chp_event,
Cornelia Huck8bbace72006-01-11 10:56:22 +0100172 .probe = io_subchannel_probe,
173 .remove = io_subchannel_remove,
174 .shutdown = io_subchannel_shutdown,
Cornelia Huck93a27592009-06-16 10:30:23 +0200175 .prepare = io_subchannel_prepare,
Sebastian Ott8ea7f552009-09-22 22:58:35 +0200176 .settle = io_subchannel_settle,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177};
178
Sebastian Ott2f176442009-09-22 22:58:33 +0200179int __init io_subchannel_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
181 int ret;
182
183 init_waitqueue_head(&ccw_device_init_wq);
184 atomic_set(&ccw_device_init_count, 0);
Peter Oberparleiter90ab1332008-01-26 14:10:52 +0100185 setup_timer(&recovery_timer, recovery_func, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187 ccw_device_work = create_singlethread_workqueue("cio");
188 if (!ccw_device_work)
Sebastian Ott2f176442009-09-22 22:58:33 +0200189 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 slow_path_wq = create_singlethread_workqueue("kslowcrw");
191 if (!slow_path_wq) {
Sebastian Ott2f176442009-09-22 22:58:33 +0200192 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 goto out_err;
194 }
195 if ((ret = bus_register (&ccw_bus_type)))
196 goto out_err;
197
Cornelia Huck25b7bb52008-01-26 14:10:41 +0100198 ret = css_driver_register(&io_subchannel_driver);
199 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 goto out_err;
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return 0;
203out_err:
204 if (ccw_device_work)
205 destroy_workqueue(ccw_device_work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (slow_path_wq)
207 destroy_workqueue(slow_path_wq);
208 return ret;
209}
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212/************************ device handling **************************/
213
214/*
215 * A ccw_device has some interfaces in sysfs in addition to the
216 * standard ones.
217 * The following entries are designed to export the information which
218 * resided in 2.4 in /proc/subchannels. Subchannel and device number
219 * are obvious, so they don't have an entry :)
220 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
221 */
222static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400223chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 struct subchannel *sch = to_subchannel(dev);
Peter Oberparleiter7ad6a242007-04-27 16:01:35 +0200226 struct chsc_ssd_info *ssd = &sch->ssd_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 ssize_t ret = 0;
228 int chp;
Peter Oberparleiter7ad6a242007-04-27 16:01:35 +0200229 int mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Peter Oberparleiter7ad6a242007-04-27 16:01:35 +0200231 for (chp = 0; chp < 8; chp++) {
232 mask = 0x80 >> chp;
233 if (ssd->path_mask & mask)
234 ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
235 else
236 ret += sprintf(buf + ret, "00 ");
237 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 ret += sprintf (buf+ret, "\n");
239 return min((ssize_t)PAGE_SIZE, ret);
240}
241
242static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400243pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244{
245 struct subchannel *sch = to_subchannel(dev);
246 struct pmcw *pmcw = &sch->schib.pmcw;
247
248 return sprintf (buf, "%02x %02x %02x\n",
249 pmcw->pim, pmcw->pam, pmcw->pom);
250}
251
252static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400253devtype_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 if (id->dev_type != 0)
259 return sprintf(buf, "%04x/%02x\n",
260 id->dev_type, id->dev_model);
261 else
262 return sprintf(buf, "n/a\n");
263}
264
265static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400266cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267{
268 struct ccw_device *cdev = to_ccwdev(dev);
269 struct ccw_device_id *id = &(cdev->id);
270
271 return sprintf(buf, "%04x/%02x\n",
272 id->cu_type, id->cu_model);
273}
274
275static ssize_t
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800276modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
277{
278 struct ccw_device *cdev = to_ccwdev(dev);
279 struct ccw_device_id *id = &(cdev->id);
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200280 int len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800281
Cornelia Huck086a6c62007-07-17 13:36:08 +0200282 len = snprint_alias(buf, PAGE_SIZE, id, "\n");
Peter Oberparleiterdb0c2d52006-09-20 15:59:49 +0200283
284 return len > PAGE_SIZE ? PAGE_SIZE : len;
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800285}
286
287static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400288online_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289{
290 struct ccw_device *cdev = to_ccwdev(dev);
291
292 return sprintf(buf, cdev->online ? "1\n" : "0\n");
293}
294
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100295int ccw_device_is_orphan(struct ccw_device *cdev)
296{
297 return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
298}
299
Cornelia Huckef995162007-04-27 16:01:39 +0200300static void ccw_device_unregister(struct ccw_device *cdev)
Cornelia Huck7674da72006-12-08 15:54:21 +0100301{
Sebastian Ott3b554a12009-09-11 10:28:26 +0200302 if (test_and_clear_bit(1, &cdev->private->registered)) {
Cornelia Huckef995162007-04-27 16:01:39 +0200303 device_del(&cdev->dev);
Sebastian Ott3b554a12009-09-11 10:28:26 +0200304 /* Release reference from device_initialize(). */
305 put_device(&cdev->dev);
306 }
Cornelia Huck7674da72006-12-08 15:54:21 +0100307}
308
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200309static void ccw_device_remove_orphan_cb(struct work_struct *work)
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200310{
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200311 struct ccw_device_private *priv;
312 struct ccw_device *cdev;
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200313
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200314 priv = container_of(work, struct ccw_device_private, kick_work);
315 cdev = priv->cdev;
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200316 ccw_device_unregister(cdev);
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200317 /* Release cdev reference for workqueue processing. */
318 put_device(&cdev->dev);
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200319}
320
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200321static void
322ccw_device_remove_disconnected(struct ccw_device *cdev)
323{
324 unsigned long flags;
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200325
326 /*
327 * Forced offline in disconnected state means
328 * 'throw away device'.
329 */
330 if (ccw_device_is_orphan(cdev)) {
331 /*
332 * Deregister ccw device.
333 * Unfortunately, we cannot do this directly from the
334 * attribute method.
335 */
Sebastian Ottbe7a2dd2009-09-11 10:28:20 +0200336 /* Get cdev reference for workqueue processing. */
337 if (!get_device(&cdev->dev))
338 return;
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200339 spin_lock_irqsave(cdev->ccwlock, flags);
340 cdev->private->state = DEV_STATE_NOT_OPER;
341 spin_unlock_irqrestore(cdev->ccwlock, flags);
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200342 PREPARE_WORK(&cdev->private->kick_work,
343 ccw_device_remove_orphan_cb);
Sebastian Ottc4621a62009-03-31 19:16:04 +0200344 queue_work(slow_path_wq, &cdev->private->kick_work);
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +0200345 } else
346 /* Deregister subchannel, which will kill the ccw device. */
Sebastian Ottc4621a62009-03-31 19:16:04 +0200347 ccw_device_schedule_sch_unregister(cdev);
Cornelia Huck59a8a6e2007-05-31 17:38:06 +0200348}
349
Cornelia Huckb2ffd8e2007-10-12 16:11:17 +0200350/**
351 * ccw_device_set_offline() - disable a ccw device for I/O
352 * @cdev: target ccw device
353 *
354 * This function calls the driver's set_offline() function for @cdev, if
355 * given, and then disables @cdev.
356 * Returns:
357 * %0 on success and a negative error value on failure.
358 * Context:
359 * enabled, ccw device lock not held
360 */
361int ccw_device_set_offline(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362{
363 int ret;
364
365 if (!cdev)
366 return -ENODEV;
367 if (!cdev->online || !cdev->drv)
368 return -EINVAL;
369
370 if (cdev->drv->set_offline) {
371 ret = cdev->drv->set_offline(cdev);
372 if (ret != 0)
373 return ret;
374 }
375 cdev->online = 0;
376 spin_lock_irq(cdev->ccwlock);
Michael Ernst217ee6c2009-09-11 10:28:21 +0200377 /* Wait until a final state or DISCONNECTED is reached */
378 while (!dev_fsm_final_state(cdev) &&
379 cdev->private->state != DEV_STATE_DISCONNECTED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 spin_unlock_irq(cdev->ccwlock);
Michael Ernst217ee6c2009-09-11 10:28:21 +0200381 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
382 cdev->private->state == DEV_STATE_DISCONNECTED));
383 spin_lock_irq(cdev->ccwlock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
Michael Ernst217ee6c2009-09-11 10:28:21 +0200385 ret = ccw_device_offline(cdev);
386 if (ret)
387 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 spin_unlock_irq(cdev->ccwlock);
Michael Ernst217ee6c2009-09-11 10:28:21 +0200389 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
390 cdev->private->state == DEV_STATE_DISCONNECTED));
391 /* Give up reference from ccw_device_set_online(). */
392 put_device(&cdev->dev);
393 return 0;
394
395error:
396 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, device 0.%x.%04x\n",
397 ret, cdev->private->dev_id.ssid,
398 cdev->private->dev_id.devno);
399 cdev->private->state = DEV_STATE_OFFLINE;
400 dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
401 spin_unlock_irq(cdev->ccwlock);
402 /* Give up reference from ccw_device_set_online(). */
403 put_device(&cdev->dev);
404 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
Cornelia Huckb2ffd8e2007-10-12 16:11:17 +0200407/**
408 * ccw_device_set_online() - enable a ccw device for I/O
409 * @cdev: target ccw device
410 *
411 * This function first enables @cdev and then calls the driver's set_online()
412 * function for @cdev, if given. If set_online() returns an error, @cdev is
413 * disabled again.
414 * Returns:
415 * %0 on success and a negative error value on failure.
416 * Context:
417 * enabled, ccw device lock not held
418 */
419int ccw_device_set_online(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420{
421 int ret;
Michael Ernst217ee6c2009-09-11 10:28:21 +0200422 int ret2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424 if (!cdev)
425 return -ENODEV;
426 if (cdev->online || !cdev->drv)
427 return -EINVAL;
Cornelia Huck9cd67422008-12-25 13:39:06 +0100428 /* Hold on to an extra reference while device is online. */
429 if (!get_device(&cdev->dev))
430 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432 spin_lock_irq(cdev->ccwlock);
433 ret = ccw_device_online(cdev);
434 spin_unlock_irq(cdev->ccwlock);
435 if (ret == 0)
436 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
437 else {
Michael Ernst139b83d2008-05-07 09:22:54 +0200438 CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
Cornelia Hucke556bbb2007-07-27 12:29:19 +0200439 "device 0.%x.%04x\n",
440 ret, cdev->private->dev_id.ssid,
441 cdev->private->dev_id.devno);
Cornelia Huck9cd67422008-12-25 13:39:06 +0100442 /* Give up online reference since onlining failed. */
443 put_device(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return ret;
445 }
Michael Ernst217ee6c2009-09-11 10:28:21 +0200446 spin_lock_irq(cdev->ccwlock);
447 /* Check if online processing was successful */
448 if ((cdev->private->state != DEV_STATE_ONLINE) &&
449 (cdev->private->state != DEV_STATE_W4SENSE)) {
450 spin_unlock_irq(cdev->ccwlock);
Cornelia Huck9cd67422008-12-25 13:39:06 +0100451 /* Give up online reference since onlining failed. */
452 put_device(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return -ENODEV;
Cornelia Huck9cd67422008-12-25 13:39:06 +0100454 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 spin_unlock_irq(cdev->ccwlock);
Michael Ernst217ee6c2009-09-11 10:28:21 +0200456 if (cdev->drv->set_online)
457 ret = cdev->drv->set_online(cdev);
458 if (ret)
459 goto rollback;
460 cdev->online = 1;
461 return 0;
462
463rollback:
464 spin_lock_irq(cdev->ccwlock);
465 /* Wait until a final state or DISCONNECTED is reached */
466 while (!dev_fsm_final_state(cdev) &&
467 cdev->private->state != DEV_STATE_DISCONNECTED) {
468 spin_unlock_irq(cdev->ccwlock);
469 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
470 cdev->private->state == DEV_STATE_DISCONNECTED));
471 spin_lock_irq(cdev->ccwlock);
472 }
473 ret2 = ccw_device_offline(cdev);
474 if (ret2)
475 goto error;
476 spin_unlock_irq(cdev->ccwlock);
477 wait_event(cdev->private->wait_q, (dev_fsm_final_state(cdev) ||
478 cdev->private->state == DEV_STATE_DISCONNECTED));
Cornelia Huck9cd67422008-12-25 13:39:06 +0100479 /* Give up online reference since onlining failed. */
480 put_device(&cdev->dev);
Michael Ernst217ee6c2009-09-11 10:28:21 +0200481 return ret;
482
483error:
484 CIO_MSG_EVENT(0, "rollback ccw_device_offline returned %d, "
485 "device 0.%x.%04x\n",
486 ret2, cdev->private->dev_id.ssid,
487 cdev->private->dev_id.devno);
488 cdev->private->state = DEV_STATE_OFFLINE;
489 spin_unlock_irq(cdev->ccwlock);
490 /* Give up online reference since onlining failed. */
491 put_device(&cdev->dev);
492 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
Sebastian Otte74fe0c2009-03-26 15:24:08 +0100495static int online_store_handle_offline(struct ccw_device *cdev)
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200496{
497 if (cdev->private->state == DEV_STATE_DISCONNECTED)
498 ccw_device_remove_disconnected(cdev);
Sebastian Otte74fe0c2009-03-26 15:24:08 +0100499 else if (cdev->online && cdev->drv && cdev->drv->set_offline)
500 return ccw_device_set_offline(cdev);
501 return 0;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200502}
503
504static int online_store_recog_and_online(struct ccw_device *cdev)
505{
506 int ret;
507
508 /* Do device recognition, if needed. */
Sebastian Ott99f6a5702009-03-31 19:16:07 +0200509 if (cdev->private->state == DEV_STATE_BOXED) {
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200510 ret = ccw_device_recognition(cdev);
511 if (ret) {
Cornelia Hucke556bbb2007-07-27 12:29:19 +0200512 CIO_MSG_EVENT(0, "Couldn't start recognition "
513 "for device 0.%x.%04x (ret=%d)\n",
514 cdev->private->dev_id.ssid,
515 cdev->private->dev_id.devno, ret);
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200516 return ret;
517 }
518 wait_event(cdev->private->wait_q,
519 cdev->private->flags.recog_done);
Sebastian Ott156013f2009-03-31 19:16:03 +0200520 if (cdev->private->state != DEV_STATE_OFFLINE)
521 /* recognition failed */
522 return -EAGAIN;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200523 }
524 if (cdev->drv && cdev->drv->set_online)
525 ccw_device_set_online(cdev);
526 return 0;
527}
Sebastian Ott156013f2009-03-31 19:16:03 +0200528
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200529static int online_store_handle_online(struct ccw_device *cdev, int force)
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200530{
531 int ret;
532
533 ret = online_store_recog_and_online(cdev);
Sebastian Ott156013f2009-03-31 19:16:03 +0200534 if (ret && !force)
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200535 return ret;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200536 if (force && cdev->private->state == DEV_STATE_BOXED) {
537 ret = ccw_device_stlck(cdev);
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200538 if (ret)
539 return ret;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200540 if (cdev->id.cu_type == 0)
541 cdev->private->state = DEV_STATE_NOT_OPER;
Sebastian Ott156013f2009-03-31 19:16:03 +0200542 ret = online_store_recog_and_online(cdev);
543 if (ret)
544 return ret;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200545 }
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200546 return 0;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200547}
548
549static ssize_t online_store (struct device *dev, struct device_attribute *attr,
550 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551{
552 struct ccw_device *cdev = to_ccwdev(dev);
Cornelia Huck2f972202008-04-30 13:38:33 +0200553 int force, ret;
554 unsigned long i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
Sebastian Ottb5cd99e2009-03-31 19:16:06 +0200556 if ((cdev->private->state != DEV_STATE_OFFLINE &&
557 cdev->private->state != DEV_STATE_ONLINE &&
558 cdev->private->state != DEV_STATE_BOXED &&
559 cdev->private->state != DEV_STATE_DISCONNECTED) ||
560 atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return -EAGAIN;
562
563 if (cdev->drv && !try_module_get(cdev->drv->owner)) {
564 atomic_set(&cdev->private->onoff, 0);
565 return -EINVAL;
566 }
567 if (!strncmp(buf, "force\n", count)) {
568 force = 1;
569 i = 1;
Cornelia Huck2f972202008-04-30 13:38:33 +0200570 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 } else {
572 force = 0;
Cornelia Huck2f972202008-04-30 13:38:33 +0200573 ret = strict_strtoul(buf, 16, &i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
Cornelia Huck2f972202008-04-30 13:38:33 +0200575 if (ret)
576 goto out;
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200577 switch (i) {
578 case 0:
Sebastian Otte74fe0c2009-03-26 15:24:08 +0100579 ret = online_store_handle_offline(cdev);
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200580 break;
581 case 1:
Michael Ernstc78aa6c2008-07-14 09:59:22 +0200582 ret = online_store_handle_online(cdev, force);
Cornelia Huckf5ba6c82007-04-27 16:01:30 +0200583 break;
584 default:
Cornelia Huck2f972202008-04-30 13:38:33 +0200585 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 }
Cornelia Huck2f972202008-04-30 13:38:33 +0200587out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (cdev->drv)
589 module_put(cdev->drv->owner);
590 atomic_set(&cdev->private->onoff, 0);
Sebastian Otte74fe0c2009-03-26 15:24:08 +0100591 return (ret < 0) ? ret : count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592}
593
594static ssize_t
Yani Ioannou3fd3c0a2005-05-17 06:43:27 -0400595available_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596{
597 struct ccw_device *cdev = to_ccwdev(dev);
598 struct subchannel *sch;
599
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100600 if (ccw_device_is_orphan(cdev))
601 return sprintf(buf, "no device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 switch (cdev->private->state) {
603 case DEV_STATE_BOXED:
604 return sprintf(buf, "boxed\n");
605 case DEV_STATE_DISCONNECTED:
606 case DEV_STATE_DISCONNECTED_SENSE_ID:
607 case DEV_STATE_NOT_OPER:
608 sch = to_subchannel(dev->parent);
609 if (!sch->lpm)
610 return sprintf(buf, "no path\n");
611 else
612 return sprintf(buf, "no device\n");
613 default:
614 /* All other states considered fine. */
615 return sprintf(buf, "good\n");
616 }
617}
618
619static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
620static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
621static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
622static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800623static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624static DEVICE_ATTR(online, 0644, online_show, online_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625static DEVICE_ATTR(availability, 0444, available_show, NULL);
626
Cornelia Huck7e9db9e2008-07-14 09:58:44 +0200627static struct attribute *io_subchannel_attrs[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 &dev_attr_chpids.attr,
629 &dev_attr_pimpampom.attr,
630 NULL,
631};
632
Cornelia Huck7e9db9e2008-07-14 09:58:44 +0200633static struct attribute_group io_subchannel_attr_group = {
634 .attrs = io_subchannel_attrs,
Cornelia Huck529192f2006-12-08 15:55:57 +0100635};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636
637static struct attribute * ccwdev_attrs[] = {
638 &dev_attr_devtype.attr,
639 &dev_attr_cutype.attr,
Bastian Blankf1fc78a2005-10-30 15:00:12 -0800640 &dev_attr_modalias.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 &dev_attr_online.attr,
642 &dev_attr_cmb_enable.attr,
643 &dev_attr_availability.attr,
644 NULL,
645};
646
647static struct attribute_group ccwdev_attr_group = {
648 .attrs = ccwdev_attrs,
649};
650
David Brownella4dbd672009-06-24 10:06:31 -0700651static const struct attribute_group *ccwdev_attr_groups[] = {
Cornelia Huckef995162007-04-27 16:01:39 +0200652 &ccwdev_attr_group,
653 NULL,
654};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
656/* this is a simple abstraction for device_register that sets the
657 * correct bus type and adds the bus specific files */
Cornelia Huck3c9da7b2006-10-27 12:39:33 +0200658static int ccw_device_register(struct ccw_device *cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659{
660 struct device *dev = &cdev->dev;
661 int ret;
662
663 dev->bus = &ccw_bus_type;
Sebastian Ott3ac276f2009-09-11 10:28:27 +0200664 ret = dev_set_name(&cdev->dev, "0.%x.%04x", cdev->private->dev_id.ssid,
665 cdev->private->dev_id.devno);
666 if (ret)
667 return ret;
668 ret = device_add(dev);
669 if (ret)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 return ret;
671
672 set_bit(1, &cdev->private->registered);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 return ret;
674}
675
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700676struct match_data {
Cornelia Huck78964262006-10-11 15:31:38 +0200677 struct ccw_dev_id dev_id;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700678 struct ccw_device * sibling;
679};
680
681static int
682match_devno(struct device * dev, void * data)
683{
Cornelia Huck78964262006-10-11 15:31:38 +0200684 struct match_data * d = data;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700685 struct ccw_device * cdev;
686
687 cdev = to_ccwdev(dev);
688 if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100689 !ccw_device_is_orphan(cdev) &&
Cornelia Huck78964262006-10-11 15:31:38 +0200690 ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100691 (cdev != d->sibling))
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700692 return 1;
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700693 return 0;
694}
695
Cornelia Huck78964262006-10-11 15:31:38 +0200696static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
697 struct ccw_device *sibling)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 struct device *dev;
Heiko Carstens292888c2006-08-30 14:33:35 +0200700 struct match_data data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Cornelia Huck78964262006-10-11 15:31:38 +0200702 data.dev_id = *dev_id;
Heiko Carstens292888c2006-08-30 14:33:35 +0200703 data.sibling = sibling;
Cornelia Hucke5945b42005-10-11 08:28:59 -0700704 dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Cornelia Huckb0744bd2005-06-25 14:55:27 -0700706 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707}
708
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100709static int match_orphan(struct device *dev, void *data)
710{
711 struct ccw_dev_id *dev_id;
712 struct ccw_device *cdev;
713
714 dev_id = data;
715 cdev = to_ccwdev(dev);
716 return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
717}
718
719static struct ccw_device *
720get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
721 struct ccw_dev_id *dev_id)
722{
723 struct device *dev;
724
725 dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
726 match_orphan);
727
728 return dev ? to_ccwdev(dev) : NULL;
729}
730
Cornelia Huckeb32ae82009-03-26 15:24:05 +0100731void ccw_device_do_unbind_bind(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100733 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 struct ccw_device *cdev;
735 struct subchannel *sch;
Cornelia Huckeb32ae82009-03-26 15:24:05 +0100736 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100738 priv = container_of(work, struct ccw_device_private, kick_work);
739 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 sch = to_subchannel(cdev->dev.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Cornelia Huckeb32ae82009-03-26 15:24:05 +0100742 if (test_bit(1, &cdev->private->registered)) {
743 device_release_driver(&cdev->dev);
744 ret = device_attach(&cdev->dev);
745 WARN_ON(ret == -ENODEV);
746 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747}
748
749static void
750ccw_device_release(struct device *dev)
751{
752 struct ccw_device *cdev;
753
754 cdev = to_ccwdev(dev);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100755 /* Release reference of parent subchannel. */
756 put_device(cdev->dev.parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 kfree(cdev->private);
758 kfree(cdev);
759}
760
Cornelia Huck7674da72006-12-08 15:54:21 +0100761static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
762{
763 struct ccw_device *cdev;
764
765 cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
766 if (cdev) {
767 cdev->private = kzalloc(sizeof(struct ccw_device_private),
768 GFP_KERNEL | GFP_DMA);
769 if (cdev->private)
770 return cdev;
771 }
772 kfree(cdev);
773 return ERR_PTR(-ENOMEM);
774}
775
776static int io_subchannel_initialize_dev(struct subchannel *sch,
777 struct ccw_device *cdev)
778{
779 cdev->private->cdev = cdev;
780 atomic_set(&cdev->private->onoff, 0);
781 cdev->dev.parent = &sch->dev;
782 cdev->dev.release = ccw_device_release;
Heiko Carstens33583c32007-11-05 11:10:07 +0100783 INIT_WORK(&cdev->private->kick_work, NULL);
Cornelia Huckef995162007-04-27 16:01:39 +0200784 cdev->dev.groups = ccwdev_attr_groups;
Cornelia Huck7674da72006-12-08 15:54:21 +0100785 /* Do first half of device_register. */
786 device_initialize(&cdev->dev);
787 if (!get_device(&sch->dev)) {
Cornelia Huck283fdd02008-12-25 13:39:10 +0100788 /* Release reference from device_initialize(). */
789 put_device(&cdev->dev);
Cornelia Huck7674da72006-12-08 15:54:21 +0100790 return -ENODEV;
791 }
792 return 0;
793}
794
795static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
796{
797 struct ccw_device *cdev;
798 int ret;
799
800 cdev = io_subchannel_allocate_dev(sch);
801 if (!IS_ERR(cdev)) {
802 ret = io_subchannel_initialize_dev(sch, cdev);
Sebastian Ott06739a82009-08-23 18:09:04 +0200803 if (ret)
Cornelia Huck7674da72006-12-08 15:54:21 +0100804 cdev = ERR_PTR(ret);
Cornelia Huck7674da72006-12-08 15:54:21 +0100805 }
806 return cdev;
807}
808
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100809static int io_subchannel_recog(struct ccw_device *, struct subchannel *);
810
811static void sch_attach_device(struct subchannel *sch,
812 struct ccw_device *cdev)
813{
Cornelia Huck82b7ac02007-04-27 16:01:36 +0200814 css_update_ssd_info(sch);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100815 spin_lock_irq(sch->lock);
Cornelia Huckdb6a6422008-01-26 14:10:46 +0100816 sch_set_cdev(sch, cdev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100817 cdev->private->schid = sch->schid;
818 cdev->ccwlock = sch->lock;
Cornelia Huckc820de32008-07-14 09:58:45 +0200819 ccw_device_trigger_reprobe(cdev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100820 spin_unlock_irq(sch->lock);
821}
822
823static void sch_attach_disconnected_device(struct subchannel *sch,
824 struct ccw_device *cdev)
825{
826 struct subchannel *other_sch;
827 int ret;
828
Cornelia Huck6eff2082008-12-25 13:39:07 +0100829 /* Get reference for new parent. */
830 if (!get_device(&sch->dev))
831 return;
832 other_sch = to_subchannel(cdev->dev.parent);
833 /* Note: device_move() changes cdev->dev.parent */
Cornelia Huckffa6a702009-03-04 12:44:00 +0100834 ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100835 if (ret) {
Michael Ernst139b83d2008-05-07 09:22:54 +0200836 CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100837 "(ret=%d)!\n", cdev->private->dev_id.ssid,
838 cdev->private->dev_id.devno, ret);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100839 /* Put reference for new parent. */
840 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100841 return;
842 }
Cornelia Huckdb6a6422008-01-26 14:10:46 +0100843 sch_set_cdev(other_sch, NULL);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100844 /* No need to keep a subchannel without ccw device around. */
845 css_sch_device_unregister(other_sch);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100846 sch_attach_device(sch, cdev);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100847 /* Put reference for old parent. */
848 put_device(&other_sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100849}
850
851static void sch_attach_orphaned_device(struct subchannel *sch,
852 struct ccw_device *cdev)
853{
854 int ret;
Cornelia Huck6eff2082008-12-25 13:39:07 +0100855 struct subchannel *pseudo_sch;
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100856
Cornelia Huck6eff2082008-12-25 13:39:07 +0100857 /* Get reference for new parent. */
858 if (!get_device(&sch->dev))
859 return;
860 pseudo_sch = to_subchannel(cdev->dev.parent);
861 /*
862 * Try to move the ccw device to its new subchannel.
863 * Note: device_move() changes cdev->dev.parent
864 */
Cornelia Huckffa6a702009-03-04 12:44:00 +0100865 ret = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100866 if (ret) {
867 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
868 "failed (ret=%d)!\n",
869 cdev->private->dev_id.ssid,
870 cdev->private->dev_id.devno, ret);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100871 /* Put reference for new parent. */
872 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100873 return;
874 }
875 sch_attach_device(sch, cdev);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100876 /* Put reference on pseudo subchannel. */
877 put_device(&pseudo_sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100878}
879
880static void sch_create_and_recog_new_device(struct subchannel *sch)
881{
882 struct ccw_device *cdev;
883
884 /* Need to allocate a new ccw device. */
885 cdev = io_subchannel_create_ccwdev(sch);
886 if (IS_ERR(cdev)) {
887 /* OK, we did everything we could... */
888 css_sch_device_unregister(sch);
889 return;
890 }
891 spin_lock_irq(sch->lock);
Cornelia Huckdb6a6422008-01-26 14:10:46 +0100892 sch_set_cdev(sch, cdev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100893 spin_unlock_irq(sch->lock);
894 /* Start recognition for the new ccw device. */
895 if (io_subchannel_recog(cdev, sch)) {
896 spin_lock_irq(sch->lock);
Cornelia Huckdb6a6422008-01-26 14:10:46 +0100897 sch_set_cdev(sch, NULL);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100898 spin_unlock_irq(sch->lock);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100899 css_sch_device_unregister(sch);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100900 /* Put reference from io_subchannel_create_ccwdev(). */
901 put_device(&sch->dev);
902 /* Give up initial reference. */
903 put_device(&cdev->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100904 }
905}
906
907
908void ccw_device_move_to_orphanage(struct work_struct *work)
909{
910 struct ccw_device_private *priv;
911 struct ccw_device *cdev;
912 struct ccw_device *replacing_cdev;
913 struct subchannel *sch;
914 int ret;
915 struct channel_subsystem *css;
916 struct ccw_dev_id dev_id;
917
918 priv = container_of(work, struct ccw_device_private, kick_work);
919 cdev = priv->cdev;
920 sch = to_subchannel(cdev->dev.parent);
921 css = to_css(sch->dev.parent);
922 dev_id.devno = sch->schib.pmcw.dev;
923 dev_id.ssid = sch->schid.ssid;
924
Cornelia Huck6eff2082008-12-25 13:39:07 +0100925 /* Increase refcount for pseudo subchannel. */
926 get_device(&css->pseudo_subchannel->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100927 /*
928 * Move the orphaned ccw device to the orphanage so the replacing
929 * ccw device can take its place on the subchannel.
Cornelia Huck6eff2082008-12-25 13:39:07 +0100930 * Note: device_move() changes cdev->dev.parent
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100931 */
Cornelia Huckffa6a702009-03-04 12:44:00 +0100932 ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev,
933 DPM_ORDER_NONE);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100934 if (ret) {
935 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
936 "(ret=%d)!\n", cdev->private->dev_id.ssid,
937 cdev->private->dev_id.devno, ret);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100938 /* Decrease refcount for pseudo subchannel again. */
939 put_device(&css->pseudo_subchannel->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100940 return;
941 }
942 cdev->ccwlock = css->pseudo_subchannel->lock;
943 /*
944 * Search for the replacing ccw device
945 * - among the disconnected devices
946 * - in the orphanage
947 */
948 replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
949 if (replacing_cdev) {
950 sch_attach_disconnected_device(sch, replacing_cdev);
Cornelia Huck85acc402008-11-14 18:18:06 +0100951 /* Release reference from get_disc_ccwdev_by_dev_id() */
Cornelia Huck97166f52008-12-25 13:39:05 +0100952 put_device(&replacing_cdev->dev);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100953 /* Release reference of subchannel from old cdev. */
954 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100955 return;
956 }
957 replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
958 if (replacing_cdev) {
959 sch_attach_orphaned_device(sch, replacing_cdev);
Cornelia Huck85acc402008-11-14 18:18:06 +0100960 /* Release reference from get_orphaned_ccwdev_by_dev_id() */
Cornelia Huck97166f52008-12-25 13:39:05 +0100961 put_device(&replacing_cdev->dev);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100962 /* Release reference of subchannel from old cdev. */
963 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100964 return;
965 }
966 sch_create_and_recog_new_device(sch);
Cornelia Huck6eff2082008-12-25 13:39:07 +0100967 /* Release reference of subchannel from old cdev. */
968 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +0100969}
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971/*
972 * Register recognized device.
973 */
974static void
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100975io_subchannel_register(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976{
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100977 struct ccw_device_private *priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 struct ccw_device *cdev;
979 struct subchannel *sch;
980 int ret;
981 unsigned long flags;
982
Martin Schwidefskyc1637532006-12-08 15:53:57 +0100983 priv = container_of(work, struct ccw_device_private, kick_work);
984 cdev = priv->cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck5fb6b852008-12-25 13:39:08 +0100986 /*
987 * Check if subchannel is still registered. It may have become
988 * unregistered if a machine check hit us after finishing
989 * device recognition but before the register work could be
990 * queued.
991 */
992 if (!device_is_registered(&sch->dev))
993 goto out_err;
Cornelia Huck82b7ac02007-04-27 16:01:36 +0200994 css_update_ssd_info(sch);
Cornelia Huck47af5512006-12-04 15:41:07 +0100995 /*
996 * io_subchannel_register() will also be called after device
997 * recognition has been done for a boxed device (which will already
998 * be registered). We need to reprobe since we may now have sense id
999 * information.
1000 */
Cornelia Huckd6a30762008-12-25 13:39:11 +01001001 if (device_is_registered(&cdev->dev)) {
Cornelia Huck47af5512006-12-04 15:41:07 +01001002 if (!cdev->drv) {
1003 ret = device_reprobe(&cdev->dev);
1004 if (ret)
1005 /* We can't do much here. */
Michael Ernst139b83d2008-05-07 09:22:54 +02001006 CIO_MSG_EVENT(0, "device_reprobe() returned"
Cornelia Hucke556bbb2007-07-27 12:29:19 +02001007 " %d for 0.%x.%04x\n", ret,
1008 cdev->private->dev_id.ssid,
1009 cdev->private->dev_id.devno);
Cornelia Huck47af5512006-12-04 15:41:07 +01001010 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 goto out;
1012 }
Cornelia Huckfa1a8c22007-04-26 00:12:03 -07001013 /*
1014 * Now we know this subchannel will stay, we can throw
1015 * our delayed uevent.
1016 */
Ming Leif67f1292009-03-01 21:10:49 +08001017 dev_set_uevent_suppress(&sch->dev, 0);
Cornelia Huckfa1a8c22007-04-26 00:12:03 -07001018 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 /* make it known to the system */
1020 ret = ccw_device_register(cdev);
1021 if (ret) {
Cornelia Hucke556bbb2007-07-27 12:29:19 +02001022 CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
1023 cdev->private->dev_id.ssid,
1024 cdev->private->dev_id.devno, ret);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001025 spin_lock_irqsave(sch->lock, flags);
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001026 sch_set_cdev(sch, NULL);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001027 spin_unlock_irqrestore(sch->lock, flags);
Cornelia Huck6eff2082008-12-25 13:39:07 +01001028 /* Release initial device reference. */
1029 put_device(&cdev->dev);
Cornelia Huck5fb6b852008-12-25 13:39:08 +01001030 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032out:
1033 cdev->private->flags.recog_done = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 wake_up(&cdev->private->wait_q);
Cornelia Huck5fb6b852008-12-25 13:39:08 +01001035out_err:
1036 /* Release reference for workqueue processing. */
1037 put_device(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (atomic_dec_and_test(&ccw_device_init_count))
1039 wake_up(&ccw_device_init_wq);
1040}
1041
Cornelia Huck3f4cf6e2007-10-12 16:11:26 +02001042static void ccw_device_call_sch_unregister(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043{
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001044 struct ccw_device_private *priv;
1045 struct ccw_device *cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 struct subchannel *sch;
1047
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001048 priv = container_of(work, struct ccw_device_private, kick_work);
1049 cdev = priv->cdev;
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +02001050 /* Get subchannel reference for local processing. */
1051 if (!get_device(cdev->dev.parent))
1052 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 sch = to_subchannel(cdev->dev.parent);
Cornelia Huck6ab48792006-07-12 16:39:50 +02001054 css_sch_device_unregister(sch);
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +02001055 /* Release cdev reference for workqueue processing.*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 put_device(&cdev->dev);
Peter Oberparleiter46fbe4e2008-10-10 21:33:05 +02001057 /* Release subchannel reference for local processing. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 put_device(&sch->dev);
1059}
1060
Sebastian Ottc4621a62009-03-31 19:16:04 +02001061void ccw_device_schedule_sch_unregister(struct ccw_device *cdev)
1062{
Sebastian Ottbe7a2dd2009-09-11 10:28:20 +02001063 /* Get cdev reference for workqueue processing. */
1064 if (!get_device(&cdev->dev))
1065 return;
Sebastian Ottc4621a62009-03-31 19:16:04 +02001066 PREPARE_WORK(&cdev->private->kick_work,
1067 ccw_device_call_sch_unregister);
1068 queue_work(slow_path_wq, &cdev->private->kick_work);
1069}
1070
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071/*
1072 * subchannel recognition done. Called from the state machine.
1073 */
1074void
1075io_subchannel_recog_done(struct ccw_device *cdev)
1076{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (css_init_done == 0) {
1078 cdev->private->flags.recog_done = 1;
1079 return;
1080 }
1081 switch (cdev->private->state) {
Sebastian Ott47593bf2009-03-31 19:16:05 +02001082 case DEV_STATE_BOXED:
1083 /* Device did not respond in time. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 case DEV_STATE_NOT_OPER:
1085 cdev->private->flags.recog_done = 1;
Sebastian Ottc4621a62009-03-31 19:16:04 +02001086 ccw_device_schedule_sch_unregister(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 if (atomic_dec_and_test(&ccw_device_init_count))
1088 wake_up(&ccw_device_init_wq);
1089 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 case DEV_STATE_OFFLINE:
1091 /*
1092 * We can't register the device in interrupt context so
1093 * we schedule a work item.
1094 */
1095 if (!get_device(&cdev->dev))
1096 break;
1097 PREPARE_WORK(&cdev->private->kick_work,
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001098 io_subchannel_register);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 queue_work(slow_path_wq, &cdev->private->kick_work);
1100 break;
1101 }
1102}
1103
1104static int
1105io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
1106{
1107 int rc;
1108 struct ccw_device_private *priv;
1109
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001110 sch_set_cdev(sch, cdev);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001111 cdev->ccwlock = sch->lock;
Cornelia Huckfb6958a2006-01-06 00:19:25 -08001112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 /* Init private data. */
1114 priv = cdev->private;
Cornelia Huck78964262006-10-11 15:31:38 +02001115 priv->dev_id.devno = sch->schib.pmcw.dev;
1116 priv->dev_id.ssid = sch->schid.ssid;
1117 priv->schid = sch->schid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 priv->state = DEV_STATE_NOT_OPER;
1119 INIT_LIST_HEAD(&priv->cmb_list);
1120 init_waitqueue_head(&priv->wait_q);
1121 init_timer(&priv->timer);
1122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 /* Increase counter of devices currently in recognition. */
1124 atomic_inc(&ccw_device_init_count);
1125
1126 /* Start async. device sensing. */
Cornelia Huck2ec22982006-12-08 15:54:26 +01001127 spin_lock_irq(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 rc = ccw_device_recognition(cdev);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001129 spin_unlock_irq(sch->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 if (rc) {
1131 if (atomic_dec_and_test(&ccw_device_init_count))
1132 wake_up(&ccw_device_init_wq);
1133 }
1134 return rc;
1135}
1136
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001137static void ccw_device_move_to_sch(struct work_struct *work)
1138{
1139 struct ccw_device_private *priv;
1140 int rc;
1141 struct subchannel *sch;
1142 struct ccw_device *cdev;
1143 struct subchannel *former_parent;
1144
1145 priv = container_of(work, struct ccw_device_private, kick_work);
1146 sch = priv->sch;
1147 cdev = priv->cdev;
Cornelia Huck6eff2082008-12-25 13:39:07 +01001148 former_parent = to_subchannel(cdev->dev.parent);
1149 /* Get reference for new parent. */
1150 if (!get_device(&sch->dev))
1151 return;
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001152 mutex_lock(&sch->reg_mutex);
Cornelia Huck6eff2082008-12-25 13:39:07 +01001153 /*
1154 * Try to move the ccw device to its new subchannel.
1155 * Note: device_move() changes cdev->dev.parent
1156 */
Cornelia Huckffa6a702009-03-04 12:44:00 +01001157 rc = device_move(&cdev->dev, &sch->dev, DPM_ORDER_PARENT_BEFORE_DEV);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001158 mutex_unlock(&sch->reg_mutex);
1159 if (rc) {
Michael Ernst139b83d2008-05-07 09:22:54 +02001160 CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001161 "0.%x.%04x failed (ret=%d)!\n",
1162 cdev->private->dev_id.ssid,
1163 cdev->private->dev_id.devno, sch->schid.ssid,
1164 sch->schid.sch_no, rc);
1165 css_sch_device_unregister(sch);
Cornelia Huck6eff2082008-12-25 13:39:07 +01001166 /* Put reference for new parent again. */
1167 put_device(&sch->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001168 goto out;
1169 }
Cornelia Huck6eff2082008-12-25 13:39:07 +01001170 if (!sch_is_pseudo_sch(former_parent)) {
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001171 spin_lock_irq(former_parent->lock);
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001172 sch_set_cdev(former_parent, NULL);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001173 spin_unlock_irq(former_parent->lock);
1174 css_sch_device_unregister(former_parent);
1175 /* Reset intparm to zeroes. */
Sebastian Ott13952ec12008-12-25 13:39:13 +01001176 former_parent->config.intparm = 0;
1177 cio_commit_config(former_parent);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001178 }
1179 sch_attach_device(sch, cdev);
1180out:
Cornelia Huck6eff2082008-12-25 13:39:07 +01001181 /* Put reference for old parent. */
1182 put_device(&former_parent->dev);
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001183 put_device(&cdev->dev);
1184}
1185
Cornelia Huck602b20f2008-01-26 14:10:39 +01001186static void io_subchannel_irq(struct subchannel *sch)
1187{
1188 struct ccw_device *cdev;
1189
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001190 cdev = sch_get_cdev(sch);
Cornelia Huck602b20f2008-01-26 14:10:39 +01001191
Sebastian Ottefd986d2009-09-11 10:28:18 +02001192 CIO_TRACE_EVENT(6, "IRQ");
1193 CIO_TRACE_EVENT(6, dev_name(&sch->dev));
Cornelia Huck602b20f2008-01-26 14:10:39 +01001194 if (cdev)
1195 dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
1196}
1197
Sebastian Ott13952ec12008-12-25 13:39:13 +01001198void io_subchannel_init_config(struct subchannel *sch)
1199{
1200 memset(&sch->config, 0, sizeof(sch->config));
1201 sch->config.csense = 1;
Sebastian Ottd36f0c62008-12-25 13:39:15 +01001202 /* Use subchannel mp mode when there is more than 1 installed CHPID. */
1203 if ((sch->schib.pmcw.pim & (sch->schib.pmcw.pim - 1)) != 0)
Sebastian Ott13952ec12008-12-25 13:39:13 +01001204 sch->config.mp = 1;
1205}
1206
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001207static void io_subchannel_init_fields(struct subchannel *sch)
1208{
1209 if (cio_is_console(sch->schid))
1210 sch->opm = 0xff;
1211 else
1212 sch->opm = chp_get_sch_opm(sch);
1213 sch->lpm = sch->schib.pmcw.pam & sch->opm;
Cornelia Huck3a3fc292008-07-14 09:58:58 +02001214 sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001215
1216 CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
1217 " - PIM = %02X, PAM = %02X, POM = %02X\n",
1218 sch->schib.pmcw.dev, sch->schid.ssid,
1219 sch->schid.sch_no, sch->schib.pmcw.pim,
1220 sch->schib.pmcw.pam, sch->schib.pmcw.pom);
Sebastian Ott13952ec12008-12-25 13:39:13 +01001221
1222 io_subchannel_init_config(sch);
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001223}
1224
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001225static void io_subchannel_do_unreg(struct work_struct *work)
1226{
1227 struct subchannel *sch;
1228
1229 sch = container_of(work, struct subchannel, work);
1230 css_sch_device_unregister(sch);
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001231 put_device(&sch->dev);
1232}
1233
1234/* Schedule unregister if we have no cdev. */
1235static void io_subchannel_schedule_removal(struct subchannel *sch)
1236{
1237 get_device(&sch->dev);
1238 INIT_WORK(&sch->work, io_subchannel_do_unreg);
1239 queue_work(slow_path_wq, &sch->work);
1240}
1241
1242/*
1243 * Note: We always return 0 so that we bind to the device even on error.
1244 * This is needed so that our remove function is called on unregister.
1245 */
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001246static int io_subchannel_probe(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 struct ccw_device *cdev;
1249 int rc;
1250 unsigned long flags;
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001251 struct ccw_dev_id dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
Peter Oberparleiter6d7c5af2009-10-14 12:43:50 +02001253 if (cio_is_console(sch->schid)) {
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001254 rc = sysfs_create_group(&sch->dev.kobj,
1255 &io_subchannel_attr_group);
1256 if (rc)
1257 CIO_MSG_EVENT(0, "Failed to create io subchannel "
1258 "attributes for subchannel "
1259 "0.%x.%04x (rc=%d)\n",
1260 sch->schid.ssid, sch->schid.sch_no, rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 /*
Peter Oberparleiter6d7c5af2009-10-14 12:43:50 +02001262 * The console subchannel already has an associated ccw_device.
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001263 * Throw the delayed uevent for the subchannel, register
Peter Oberparleiter6d7c5af2009-10-14 12:43:50 +02001264 * the ccw_device and exit.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 */
Ming Leif67f1292009-03-01 21:10:49 +08001266 dev_set_uevent_suppress(&sch->dev, 0);
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001267 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
Peter Oberparleiter6d7c5af2009-10-14 12:43:50 +02001268 cdev = sch_get_cdev(sch);
Cornelia Hucke1031782007-10-12 16:11:23 +02001269 cdev->dev.groups = ccwdev_attr_groups;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 device_initialize(&cdev->dev);
1271 ccw_device_register(cdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 /*
1273 * Check if the device is already online. If it is
Cornelia Huck9cd67422008-12-25 13:39:06 +01001274 * the reference count needs to be corrected since we
1275 * didn't obtain a reference in ccw_device_set_online.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 */
1277 if (cdev->private->state != DEV_STATE_NOT_OPER &&
1278 cdev->private->state != DEV_STATE_OFFLINE &&
1279 cdev->private->state != DEV_STATE_BOXED)
1280 get_device(&cdev->dev);
1281 return 0;
1282 }
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001283 io_subchannel_init_fields(sch);
Sebastian Ottf444cc02008-12-25 13:39:14 +01001284 rc = cio_commit_config(sch);
1285 if (rc)
1286 goto out_schedule;
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001287 rc = sysfs_create_group(&sch->dev.kobj,
1288 &io_subchannel_attr_group);
1289 if (rc)
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001290 goto out_schedule;
Cornelia Huckcd6b4f22008-01-26 14:10:43 +01001291 /* Allocate I/O subchannel private data. */
1292 sch->private = kzalloc(sizeof(struct io_subchannel_private),
1293 GFP_KERNEL | GFP_DMA);
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001294 if (!sch->private)
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001295 goto out_err;
Sebastian Ott111e95a2008-12-25 13:39:03 +01001296 /*
1297 * First check if a fitting device may be found amongst the
1298 * disconnected devices or in the orphanage.
1299 */
1300 dev_id.devno = sch->schib.pmcw.dev;
1301 dev_id.ssid = sch->schid.ssid;
Cornelia Huckd7b5a4c2006-12-08 15:54:28 +01001302 cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
1303 if (!cdev)
1304 cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
1305 &dev_id);
1306 if (cdev) {
1307 /*
1308 * Schedule moving the device until when we have a registered
1309 * subchannel to move to and succeed the probe. We can
1310 * unregister later again, when the probe is through.
1311 */
1312 cdev->private->sch = sch;
1313 PREPARE_WORK(&cdev->private->kick_work,
1314 ccw_device_move_to_sch);
1315 queue_work(slow_path_wq, &cdev->private->kick_work);
1316 return 0;
1317 }
Cornelia Huck7674da72006-12-08 15:54:21 +01001318 cdev = io_subchannel_create_ccwdev(sch);
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001319 if (IS_ERR(cdev))
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001320 goto out_err;
Cornelia Huck8bbace72006-01-11 10:56:22 +01001321 rc = io_subchannel_recog(cdev, sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 if (rc) {
Cornelia Huck2ec22982006-12-08 15:54:26 +01001323 spin_lock_irqsave(sch->lock, flags);
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001324 io_subchannel_recog_done(cdev);
Cornelia Huck2ec22982006-12-08 15:54:26 +01001325 spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 }
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001327 return 0;
1328out_err:
1329 kfree(sch->private);
1330 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
Cornelia Huck90ed2b62008-12-25 13:39:09 +01001331out_schedule:
1332 io_subchannel_schedule_removal(sch);
1333 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334}
1335
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336static int
Cornelia Huck8bbace72006-01-11 10:56:22 +01001337io_subchannel_remove (struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338{
1339 struct ccw_device *cdev;
1340 unsigned long flags;
1341
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001342 cdev = sch_get_cdev(sch);
1343 if (!cdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 /* Set ccw device to not operational and drop reference. */
1346 spin_lock_irqsave(cdev->ccwlock, flags);
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001347 sch_set_cdev(sch, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 cdev->private->state = DEV_STATE_NOT_OPER;
1349 spin_unlock_irqrestore(cdev->ccwlock, flags);
Cornelia Huckef995162007-04-27 16:01:39 +02001350 ccw_device_unregister(cdev);
Cornelia Huckcd6b4f22008-01-26 14:10:43 +01001351 kfree(sch->private);
Cornelia Huck7e9db9e2008-07-14 09:58:44 +02001352 sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 return 0;
1354}
1355
Cornelia Huck602b20f2008-01-26 14:10:39 +01001356static int io_subchannel_notify(struct subchannel *sch, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357{
1358 struct ccw_device *cdev;
1359
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001360 cdev = sch_get_cdev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 if (!cdev)
1362 return 0;
Cornelia Huckc820de32008-07-14 09:58:45 +02001363 return ccw_device_notify(cdev, event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364}
1365
Cornelia Huck602b20f2008-01-26 14:10:39 +01001366static void io_subchannel_verify(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367{
1368 struct ccw_device *cdev;
1369
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001370 cdev = sch_get_cdev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 if (cdev)
1372 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1373}
1374
Cornelia Huckc820de32008-07-14 09:58:45 +02001375static int check_for_io_on_path(struct subchannel *sch, int mask)
1376{
Sebastian Ottcdb912a2008-12-25 13:39:12 +01001377 if (cio_update_schib(sch))
Cornelia Huckc820de32008-07-14 09:58:45 +02001378 return 0;
Peter Oberparleiter23d805b2008-07-14 09:58:50 +02001379 if (scsw_actl(&sch->schib.scsw) && sch->schib.pmcw.lpum == mask)
Cornelia Huckc820de32008-07-14 09:58:45 +02001380 return 1;
1381 return 0;
1382}
1383
1384static void terminate_internal_io(struct subchannel *sch,
1385 struct ccw_device *cdev)
1386{
1387 if (cio_clear(sch)) {
1388 /* Recheck device in case clear failed. */
1389 sch->lpm = 0;
1390 if (cdev->online)
1391 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1392 else
1393 css_schedule_eval(sch->schid);
1394 return;
1395 }
1396 cdev->private->state = DEV_STATE_CLEAR_VERIFY;
1397 /* Request retry of internal operation. */
1398 cdev->private->flags.intretry = 1;
1399 /* Call handler. */
1400 if (cdev->handler)
1401 cdev->handler(cdev, cdev->private->intparm,
1402 ERR_PTR(-EIO));
1403}
1404
1405static void io_subchannel_terminate_path(struct subchannel *sch, u8 mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
1407 struct ccw_device *cdev;
1408
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001409 cdev = sch_get_cdev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 if (!cdev)
1411 return;
Cornelia Huckc820de32008-07-14 09:58:45 +02001412 if (check_for_io_on_path(sch, mask)) {
1413 if (cdev->private->state == DEV_STATE_ONLINE)
1414 ccw_device_kill_io(cdev);
1415 else {
1416 terminate_internal_io(sch, cdev);
1417 /* Re-start path verification. */
1418 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1419 }
1420 } else
1421 /* trigger path verification. */
1422 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1423
1424}
1425
Cornelia Huck99611f82008-07-14 09:59:02 +02001426static int io_subchannel_chp_event(struct subchannel *sch,
1427 struct chp_link *link, int event)
Cornelia Huckc820de32008-07-14 09:58:45 +02001428{
1429 int mask;
Cornelia Huckc820de32008-07-14 09:58:45 +02001430
Cornelia Huck99611f82008-07-14 09:59:02 +02001431 mask = chp_ssd_get_mask(&sch->ssd_info, link);
Cornelia Huckc820de32008-07-14 09:58:45 +02001432 if (!mask)
1433 return 0;
1434 switch (event) {
1435 case CHP_VARY_OFF:
1436 sch->opm &= ~mask;
1437 sch->lpm &= ~mask;
1438 io_subchannel_terminate_path(sch, mask);
1439 break;
1440 case CHP_VARY_ON:
1441 sch->opm |= mask;
1442 sch->lpm |= mask;
1443 io_subchannel_verify(sch);
1444 break;
1445 case CHP_OFFLINE:
Sebastian Ottcdb912a2008-12-25 13:39:12 +01001446 if (cio_update_schib(sch))
Cornelia Huckc820de32008-07-14 09:58:45 +02001447 return -ENODEV;
1448 io_subchannel_terminate_path(sch, mask);
1449 break;
1450 case CHP_ONLINE:
Sebastian Ottcdb912a2008-12-25 13:39:12 +01001451 if (cio_update_schib(sch))
1452 return -ENODEV;
Cornelia Huckc820de32008-07-14 09:58:45 +02001453 sch->lpm |= mask & sch->opm;
1454 io_subchannel_verify(sch);
1455 break;
1456 }
1457 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458}
1459
1460static void
Cornelia Huck8bbace72006-01-11 10:56:22 +01001461io_subchannel_shutdown(struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 struct ccw_device *cdev;
1464 int ret;
1465
Cornelia Huckdb6a6422008-01-26 14:10:46 +01001466 cdev = sch_get_cdev(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Cornelia Hucka8237fc2006-01-06 00:19:21 -08001468 if (cio_is_console(sch->schid))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 return;
1470 if (!sch->schib.pmcw.ena)
1471 /* Nothing to do. */
1472 return;
1473 ret = cio_disable_subchannel(sch);
1474 if (ret != -EBUSY)
1475 /* Subchannel is disabled, we're done. */
1476 return;
1477 cdev->private->state = DEV_STATE_QUIESCE;
1478 if (cdev->handler)
1479 cdev->handler(cdev, cdev->private->intparm,
1480 ERR_PTR(-EIO));
1481 ret = ccw_device_cancel_halt_clear(cdev);
1482 if (ret == -EBUSY) {
1483 ccw_device_set_timeout(cdev, HZ/10);
1484 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
1485 }
1486 cio_disable_subchannel(sch);
1487}
1488
Cornelia Huckc820de32008-07-14 09:58:45 +02001489static int io_subchannel_get_status(struct subchannel *sch)
1490{
1491 struct schib schib;
1492
1493 if (stsch(sch->schid, &schib) || !schib.pmcw.dnv)
1494 return CIO_GONE;
1495 if (sch->schib.pmcw.dnv && (schib.pmcw.dev != sch->schib.pmcw.dev))
1496 return CIO_REVALIDATE;
1497 if (!sch->lpm)
1498 return CIO_NO_PATH;
1499 return CIO_OPER;
1500}
1501
1502static int device_is_disconnected(struct ccw_device *cdev)
1503{
1504 if (!cdev)
1505 return 0;
1506 return (cdev->private->state == DEV_STATE_DISCONNECTED ||
1507 cdev->private->state == DEV_STATE_DISCONNECTED_SENSE_ID);
1508}
1509
1510static int recovery_check(struct device *dev, void *data)
1511{
1512 struct ccw_device *cdev = to_ccwdev(dev);
1513 int *redo = data;
1514
1515 spin_lock_irq(cdev->ccwlock);
1516 switch (cdev->private->state) {
1517 case DEV_STATE_DISCONNECTED:
1518 CIO_MSG_EVENT(3, "recovery: trigger 0.%x.%04x\n",
1519 cdev->private->dev_id.ssid,
1520 cdev->private->dev_id.devno);
1521 dev_fsm_event(cdev, DEV_EVENT_VERIFY);
1522 *redo = 1;
1523 break;
1524 case DEV_STATE_DISCONNECTED_SENSE_ID:
1525 *redo = 1;
1526 break;
1527 }
1528 spin_unlock_irq(cdev->ccwlock);
1529
1530 return 0;
1531}
1532
1533static void recovery_work_func(struct work_struct *unused)
1534{
1535 int redo = 0;
1536
1537 bus_for_each_dev(&ccw_bus_type, NULL, &redo, recovery_check);
1538 if (redo) {
1539 spin_lock_irq(&recovery_lock);
1540 if (!timer_pending(&recovery_timer)) {
1541 if (recovery_phase < ARRAY_SIZE(recovery_delay) - 1)
1542 recovery_phase++;
1543 mod_timer(&recovery_timer, jiffies +
1544 recovery_delay[recovery_phase] * HZ);
1545 }
1546 spin_unlock_irq(&recovery_lock);
1547 } else
1548 CIO_MSG_EVENT(4, "recovery: end\n");
1549}
1550
1551static DECLARE_WORK(recovery_work, recovery_work_func);
1552
1553static void recovery_func(unsigned long data)
1554{
1555 /*
1556 * We can't do our recovery in softirq context and it's not
1557 * performance critical, so we schedule it.
1558 */
1559 schedule_work(&recovery_work);
1560}
1561
1562static void ccw_device_schedule_recovery(void)
1563{
1564 unsigned long flags;
1565
1566 CIO_MSG_EVENT(4, "recovery: schedule\n");
1567 spin_lock_irqsave(&recovery_lock, flags);
1568 if (!timer_pending(&recovery_timer) || (recovery_phase != 0)) {
1569 recovery_phase = 0;
1570 mod_timer(&recovery_timer, jiffies + recovery_delay[0] * HZ);
1571 }
1572 spin_unlock_irqrestore(&recovery_lock, flags);
1573}
1574
Peter Oberparleiterecf5d9e2008-10-10 21:33:06 +02001575static int purge_fn(struct device *dev, void *data)
1576{
1577 struct ccw_device *cdev = to_ccwdev(dev);
1578 struct ccw_device_private *priv = cdev->private;
1579 int unreg;
1580
1581 spin_lock_irq(cdev->ccwlock);
1582 unreg = is_blacklisted(priv->dev_id.ssid, priv->dev_id.devno) &&
1583 (priv->state == DEV_STATE_OFFLINE);
1584 spin_unlock_irq(cdev->ccwlock);
1585 if (!unreg)
1586 goto out;
Peter Oberparleiterecf5d9e2008-10-10 21:33:06 +02001587 CIO_MSG_EVENT(3, "ccw: purging 0.%x.%04x\n", priv->dev_id.ssid,
1588 priv->dev_id.devno);
Sebastian Ottc4621a62009-03-31 19:16:04 +02001589 ccw_device_schedule_sch_unregister(cdev);
Peter Oberparleiterecf5d9e2008-10-10 21:33:06 +02001590
1591out:
1592 /* Abort loop in case of pending signal. */
1593 if (signal_pending(current))
1594 return -EINTR;
1595
1596 return 0;
1597}
1598
1599/**
1600 * ccw_purge_blacklisted - purge unused, blacklisted devices
1601 *
1602 * Unregister all ccw devices that are offline and on the blacklist.
1603 */
1604int ccw_purge_blacklisted(void)
1605{
1606 CIO_MSG_EVENT(2, "ccw: purging blacklisted devices\n");
1607 bus_for_each_dev(&ccw_bus_type, NULL, NULL, purge_fn);
1608 return 0;
1609}
1610
Peter Oberparleiter6afcc772009-10-06 10:34:02 +02001611void ccw_device_set_disconnected(struct ccw_device *cdev)
Cornelia Huckc820de32008-07-14 09:58:45 +02001612{
1613 if (!cdev)
1614 return;
1615 ccw_device_set_timeout(cdev, 0);
1616 cdev->private->flags.fake_irb = 0;
1617 cdev->private->state = DEV_STATE_DISCONNECTED;
1618 if (cdev->online)
1619 ccw_device_schedule_recovery();
1620}
1621
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001622void ccw_device_set_notoper(struct ccw_device *cdev)
1623{
1624 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1625
1626 CIO_TRACE_EVENT(2, "notoper");
Cornelia Huckb9d3aed2008-10-10 21:33:11 +02001627 CIO_TRACE_EVENT(2, dev_name(&sch->dev));
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001628 ccw_device_set_timeout(cdev, 0);
1629 cio_disable_subchannel(sch);
1630 cdev->private->state = DEV_STATE_NOT_OPER;
1631}
1632
Cornelia Huckc820de32008-07-14 09:58:45 +02001633static int io_subchannel_sch_event(struct subchannel *sch, int slow)
1634{
1635 int event, ret, disc;
1636 unsigned long flags;
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001637 enum { NONE, UNREGISTER, UNREGISTER_PROBE, REPROBE, DISC } action;
Cornelia Huckc820de32008-07-14 09:58:45 +02001638 struct ccw_device *cdev;
1639
1640 spin_lock_irqsave(sch->lock, flags);
1641 cdev = sch_get_cdev(sch);
1642 disc = device_is_disconnected(cdev);
1643 if (disc && slow) {
1644 /* Disconnected devices are evaluated directly only.*/
1645 spin_unlock_irqrestore(sch->lock, flags);
1646 return 0;
1647 }
1648 /* No interrupt after machine check - kill pending timers. */
1649 if (cdev)
1650 ccw_device_set_timeout(cdev, 0);
1651 if (!disc && !slow) {
1652 /* Non-disconnected devices are evaluated on the slow path. */
1653 spin_unlock_irqrestore(sch->lock, flags);
1654 return -EAGAIN;
1655 }
1656 event = io_subchannel_get_status(sch);
1657 CIO_MSG_EVENT(4, "Evaluating schid 0.%x.%04x, event %d, %s, %s path.\n",
1658 sch->schid.ssid, sch->schid.sch_no, event,
1659 disc ? "disconnected" : "normal",
1660 slow ? "slow" : "fast");
1661 /* Analyze subchannel status. */
1662 action = NONE;
1663 switch (event) {
1664 case CIO_NO_PATH:
1665 if (disc) {
1666 /* Check if paths have become available. */
1667 action = REPROBE;
1668 break;
1669 }
1670 /* fall through */
1671 case CIO_GONE:
Cornelia Huckc820de32008-07-14 09:58:45 +02001672 /* Ask driver what to do with device. */
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001673 if (io_subchannel_notify(sch, event))
1674 action = DISC;
1675 else
1676 action = UNREGISTER;
Cornelia Huckc820de32008-07-14 09:58:45 +02001677 break;
1678 case CIO_REVALIDATE:
1679 /* Device will be removed, so no notify necessary. */
1680 if (disc)
1681 /* Reprobe because immediate unregister might block. */
1682 action = REPROBE;
1683 else
1684 action = UNREGISTER_PROBE;
1685 break;
1686 case CIO_OPER:
1687 if (disc)
1688 /* Get device operational again. */
1689 action = REPROBE;
1690 break;
1691 }
1692 /* Perform action. */
1693 ret = 0;
1694 switch (action) {
1695 case UNREGISTER:
1696 case UNREGISTER_PROBE:
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001697 ccw_device_set_notoper(cdev);
Cornelia Huckc820de32008-07-14 09:58:45 +02001698 /* Unregister device (will use subchannel lock). */
1699 spin_unlock_irqrestore(sch->lock, flags);
1700 css_sch_device_unregister(sch);
1701 spin_lock_irqsave(sch->lock, flags);
Cornelia Huckc820de32008-07-14 09:58:45 +02001702 break;
1703 case REPROBE:
1704 ccw_device_trigger_reprobe(cdev);
1705 break;
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001706 case DISC:
Peter Oberparleiter6afcc772009-10-06 10:34:02 +02001707 ccw_device_set_disconnected(cdev);
Peter Oberparleiter91c36912008-08-21 19:46:39 +02001708 break;
Cornelia Huckc820de32008-07-14 09:58:45 +02001709 default:
1710 break;
1711 }
1712 spin_unlock_irqrestore(sch->lock, flags);
1713 /* Probe if necessary. */
1714 if (action == UNREGISTER_PROBE)
1715 ret = css_probe_device(sch->schid);
1716
1717 return ret;
1718}
1719
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720#ifdef CONFIG_CCW_CONSOLE
1721static struct ccw_device console_cdev;
1722static struct ccw_device_private console_private;
1723static int console_cdev_in_use;
1724
Cornelia Huck2ec22982006-12-08 15:54:26 +01001725static DEFINE_SPINLOCK(ccw_console_lock);
1726
1727spinlock_t * cio_get_console_lock(void)
1728{
1729 return &ccw_console_lock;
1730}
1731
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001732static int ccw_device_console_enable(struct ccw_device *cdev,
1733 struct subchannel *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734{
1735 int rc;
1736
Cornelia Huckcd6b4f22008-01-26 14:10:43 +01001737 /* Attach subchannel private data. */
1738 sch->private = cio_get_console_priv();
1739 memset(sch->private, 0, sizeof(struct io_subchannel_private));
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001740 io_subchannel_init_fields(sch);
Sebastian Ottf444cc02008-12-25 13:39:14 +01001741 rc = cio_commit_config(sch);
1742 if (rc)
1743 return rc;
Cornelia Huck0ae7a7b2008-07-14 09:58:43 +02001744 sch->driver = &io_subchannel_driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 /* Initialize the ccw_device structure. */
Heiko Carstens292888c2006-08-30 14:33:35 +02001746 cdev->dev.parent= &sch->dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 rc = io_subchannel_recog(cdev, sch);
1748 if (rc)
1749 return rc;
1750
1751 /* Now wait for the async. recognition to come to an end. */
1752 spin_lock_irq(cdev->ccwlock);
1753 while (!dev_fsm_final_state(cdev))
1754 wait_cons_dev();
1755 rc = -EIO;
1756 if (cdev->private->state != DEV_STATE_OFFLINE)
1757 goto out_unlock;
1758 ccw_device_online(cdev);
1759 while (!dev_fsm_final_state(cdev))
1760 wait_cons_dev();
1761 if (cdev->private->state != DEV_STATE_ONLINE)
1762 goto out_unlock;
1763 rc = 0;
1764out_unlock:
1765 spin_unlock_irq(cdev->ccwlock);
1766 return 0;
1767}
1768
1769struct ccw_device *
1770ccw_device_probe_console(void)
1771{
1772 struct subchannel *sch;
1773 int ret;
1774
1775 if (xchg(&console_cdev_in_use, 1) != 0)
Peter Oberparleiter600b5d12006-02-01 03:06:35 -08001776 return ERR_PTR(-EBUSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 sch = cio_probe_console();
1778 if (IS_ERR(sch)) {
1779 console_cdev_in_use = 0;
1780 return (void *) sch;
1781 }
1782 memset(&console_cdev, 0, sizeof(struct ccw_device));
1783 memset(&console_private, 0, sizeof(struct ccw_device_private));
1784 console_cdev.private = &console_private;
Martin Schwidefskyc1637532006-12-08 15:53:57 +01001785 console_private.cdev = &console_cdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 ret = ccw_device_console_enable(&console_cdev, sch);
1787 if (ret) {
1788 cio_release_console();
1789 console_cdev_in_use = 0;
1790 return ERR_PTR(ret);
1791 }
1792 console_cdev.online = 1;
1793 return &console_cdev;
1794}
Cornelia Huck1f4e7ed2008-10-10 21:33:14 +02001795
Martin Schwidefsky66648452009-06-16 10:30:28 +02001796static int ccw_device_pm_restore(struct device *dev);
1797
1798int ccw_device_force_console(void)
1799{
1800 if (!console_cdev_in_use)
1801 return -ENODEV;
1802 return ccw_device_pm_restore(&console_cdev.dev);
1803}
1804EXPORT_SYMBOL_GPL(ccw_device_force_console);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805#endif
1806
1807/*
1808 * get ccw_device matching the busid, but only if owned by cdrv
1809 */
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001810static int
1811__ccwdev_check_busid(struct device *dev, void *id)
1812{
1813 char *bus_id;
1814
Cornelia Huck12975ae2006-10-11 15:31:47 +02001815 bus_id = id;
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001816
Kay Sievers98df67b2008-12-25 13:38:55 +01001817 return (strcmp(bus_id, dev_name(dev)) == 0);
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001818}
1819
1820
Cornelia Huckb2ffd8e2007-10-12 16:11:17 +02001821/**
1822 * get_ccwdev_by_busid() - obtain device from a bus id
1823 * @cdrv: driver the device is owned by
1824 * @bus_id: bus id of the device to be searched
1825 *
1826 * This function searches all devices owned by @cdrv for a device with a bus
1827 * id matching @bus_id.
1828 * Returns:
1829 * If a match is found, its reference count of the found device is increased
1830 * and it is returned; else %NULL is returned.
1831 */
1832struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv,
1833 const char *bus_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834{
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001835 struct device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 struct device_driver *drv;
1837
1838 drv = get_driver(&cdrv->driver);
1839 if (!drv)
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001840 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841
Cornelia Huckb0744bd2005-06-25 14:55:27 -07001842 dev = driver_find_device(drv, NULL, (void *)bus_id,
1843 __ccwdev_check_busid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 put_driver(drv);
1845
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001846 return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847}
1848
1849/************************** device driver handling ************************/
1850
1851/* This is the implementation of the ccw_driver class. The probe, remove
1852 * and release methods are initially very similar to the device_driver
1853 * implementations, with the difference that they have ccw_device
1854 * arguments.
1855 *
1856 * A ccw driver also contains the information that is needed for
1857 * device matching.
1858 */
1859static int
1860ccw_device_probe (struct device *dev)
1861{
1862 struct ccw_device *cdev = to_ccwdev(dev);
1863 struct ccw_driver *cdrv = to_ccwdrv(dev->driver);
1864 int ret;
1865
1866 cdev->drv = cdrv; /* to let the driver call _set_online */
1867
1868 ret = cdrv->probe ? cdrv->probe(cdev) : -ENODEV;
1869
1870 if (ret) {
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001871 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 return ret;
1873 }
1874
1875 return 0;
1876}
1877
1878static int
1879ccw_device_remove (struct device *dev)
1880{
1881 struct ccw_device *cdev = to_ccwdev(dev);
1882 struct ccw_driver *cdrv = cdev->drv;
1883 int ret;
1884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 if (cdrv->remove)
1886 cdrv->remove(cdev);
1887 if (cdev->online) {
1888 cdev->online = 0;
1889 spin_lock_irq(cdev->ccwlock);
1890 ret = ccw_device_offline(cdev);
1891 spin_unlock_irq(cdev->ccwlock);
1892 if (ret == 0)
1893 wait_event(cdev->private->wait_q,
1894 dev_fsm_final_state(cdev));
1895 else
Michael Ernst139b83d2008-05-07 09:22:54 +02001896 CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
Cornelia Hucke556bbb2007-07-27 12:29:19 +02001897 "device 0.%x.%04x\n",
1898 ret, cdev->private->dev_id.ssid,
1899 cdev->private->dev_id.devno);
Cornelia Huck9cd67422008-12-25 13:39:06 +01001900 /* Give up reference obtained in ccw_device_set_online(). */
1901 put_device(&cdev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 }
1903 ccw_device_set_timeout(cdev, 0);
Heiko Carstensd2c993d2006-07-12 16:41:55 +02001904 cdev->drv = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 return 0;
1906}
1907
Cornelia Huck958974f2007-10-12 16:11:21 +02001908static void ccw_device_shutdown(struct device *dev)
1909{
1910 struct ccw_device *cdev;
1911
1912 cdev = to_ccwdev(dev);
1913 if (cdev->drv && cdev->drv->shutdown)
1914 cdev->drv->shutdown(cdev);
Cornelia Huck1842f2b2007-10-12 16:11:22 +02001915 disable_cmf(cdev);
Cornelia Huck958974f2007-10-12 16:11:21 +02001916}
1917
Sebastian Ott823d4942009-06-16 10:30:20 +02001918static int ccw_device_pm_prepare(struct device *dev)
1919{
1920 struct ccw_device *cdev = to_ccwdev(dev);
1921
1922 if (work_pending(&cdev->private->kick_work))
1923 return -EAGAIN;
1924 /* Fail while device is being set online/offline. */
1925 if (atomic_read(&cdev->private->onoff))
1926 return -EAGAIN;
1927
1928 if (cdev->online && cdev->drv && cdev->drv->prepare)
1929 return cdev->drv->prepare(cdev);
1930
1931 return 0;
1932}
1933
1934static void ccw_device_pm_complete(struct device *dev)
1935{
1936 struct ccw_device *cdev = to_ccwdev(dev);
1937
1938 if (cdev->online && cdev->drv && cdev->drv->complete)
1939 cdev->drv->complete(cdev);
1940}
1941
1942static int ccw_device_pm_freeze(struct device *dev)
1943{
1944 struct ccw_device *cdev = to_ccwdev(dev);
1945 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1946 int ret, cm_enabled;
1947
1948 /* Fail suspend while device is in transistional state. */
1949 if (!dev_fsm_final_state(cdev))
1950 return -EAGAIN;
1951 if (!cdev->online)
1952 return 0;
1953 if (cdev->drv && cdev->drv->freeze) {
1954 ret = cdev->drv->freeze(cdev);
1955 if (ret)
1956 return ret;
1957 }
1958
1959 spin_lock_irq(sch->lock);
1960 cm_enabled = cdev->private->cmb != NULL;
1961 spin_unlock_irq(sch->lock);
1962 if (cm_enabled) {
1963 /* Don't have the css write on memory. */
1964 ret = ccw_set_cmf(cdev, 0);
1965 if (ret)
1966 return ret;
1967 }
1968 /* From here on, disallow device driver I/O. */
1969 spin_lock_irq(sch->lock);
1970 ret = cio_disable_subchannel(sch);
1971 spin_unlock_irq(sch->lock);
1972
1973 return ret;
1974}
1975
1976static int ccw_device_pm_thaw(struct device *dev)
1977{
1978 struct ccw_device *cdev = to_ccwdev(dev);
1979 struct subchannel *sch = to_subchannel(cdev->dev.parent);
1980 int ret, cm_enabled;
1981
1982 if (!cdev->online)
1983 return 0;
1984
1985 spin_lock_irq(sch->lock);
1986 /* Allow device driver I/O again. */
1987 ret = cio_enable_subchannel(sch, (u32)(addr_t)sch);
1988 cm_enabled = cdev->private->cmb != NULL;
1989 spin_unlock_irq(sch->lock);
1990 if (ret)
1991 return ret;
1992
1993 if (cm_enabled) {
1994 ret = ccw_set_cmf(cdev, 1);
1995 if (ret)
1996 return ret;
1997 }
1998
1999 if (cdev->drv && cdev->drv->thaw)
2000 ret = cdev->drv->thaw(cdev);
2001
2002 return ret;
2003}
2004
2005static void __ccw_device_pm_restore(struct ccw_device *cdev)
2006{
2007 struct subchannel *sch = to_subchannel(cdev->dev.parent);
2008 int ret;
2009
2010 if (cio_is_console(sch->schid))
2011 goto out;
2012 /*
2013 * While we were sleeping, devices may have gone or become
2014 * available again. Kick re-detection.
2015 */
2016 spin_lock_irq(sch->lock);
2017 cdev->private->flags.resuming = 1;
2018 ret = ccw_device_recognition(cdev);
2019 spin_unlock_irq(sch->lock);
2020 if (ret) {
2021 CIO_MSG_EVENT(0, "Couldn't start recognition for device "
Sebastian Ottf0148242009-09-11 10:28:23 +02002022 "0.%x.%04x (ret=%d)\n",
2023 cdev->private->dev_id.ssid,
2024 cdev->private->dev_id.devno, ret);
Sebastian Ott823d4942009-06-16 10:30:20 +02002025 spin_lock_irq(sch->lock);
2026 cdev->private->state = DEV_STATE_DISCONNECTED;
2027 spin_unlock_irq(sch->lock);
2028 /* notify driver after the resume cb */
2029 goto out;
2030 }
2031 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev) ||
2032 cdev->private->state == DEV_STATE_DISCONNECTED);
2033
2034out:
2035 cdev->private->flags.resuming = 0;
2036}
2037
2038static int resume_handle_boxed(struct ccw_device *cdev)
2039{
2040 cdev->private->state = DEV_STATE_BOXED;
2041 if (ccw_device_notify(cdev, CIO_BOXED))
2042 return 0;
2043 ccw_device_schedule_sch_unregister(cdev);
2044 return -ENODEV;
2045}
2046
2047static int resume_handle_disc(struct ccw_device *cdev)
2048{
2049 cdev->private->state = DEV_STATE_DISCONNECTED;
2050 if (ccw_device_notify(cdev, CIO_GONE))
2051 return 0;
2052 ccw_device_schedule_sch_unregister(cdev);
2053 return -ENODEV;
2054}
2055
2056static int ccw_device_pm_restore(struct device *dev)
2057{
2058 struct ccw_device *cdev = to_ccwdev(dev);
2059 struct subchannel *sch = to_subchannel(cdev->dev.parent);
2060 int ret = 0, cm_enabled;
2061
2062 __ccw_device_pm_restore(cdev);
2063 spin_lock_irq(sch->lock);
2064 if (cio_is_console(sch->schid)) {
2065 cio_enable_subchannel(sch, (u32)(addr_t)sch);
2066 spin_unlock_irq(sch->lock);
2067 goto out_restore;
2068 }
2069 cdev->private->flags.donotify = 0;
2070 /* check recognition results */
2071 switch (cdev->private->state) {
2072 case DEV_STATE_OFFLINE:
2073 break;
2074 case DEV_STATE_BOXED:
2075 ret = resume_handle_boxed(cdev);
2076 spin_unlock_irq(sch->lock);
2077 if (ret)
2078 goto out;
2079 goto out_restore;
2080 case DEV_STATE_DISCONNECTED:
2081 goto out_disc_unlock;
2082 default:
2083 goto out_unreg_unlock;
2084 }
2085 /* check if the device id has changed */
2086 if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {
Sebastian Ottf0148242009-09-11 10:28:23 +02002087 CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno "
2088 "changed from %04x to %04x)\n",
2089 sch->schid.ssid, sch->schid.sch_no,
Sebastian Ott823d4942009-06-16 10:30:20 +02002090 cdev->private->dev_id.devno,
2091 sch->schib.pmcw.dev);
2092 goto out_unreg_unlock;
2093 }
2094 /* check if the device type has changed */
2095 if (!ccw_device_test_sense_data(cdev)) {
2096 ccw_device_update_sense_data(cdev);
2097 PREPARE_WORK(&cdev->private->kick_work,
2098 ccw_device_do_unbind_bind);
2099 queue_work(ccw_device_work, &cdev->private->kick_work);
2100 ret = -ENODEV;
2101 goto out_unlock;
2102 }
2103 if (!cdev->online) {
2104 ret = 0;
2105 goto out_unlock;
2106 }
2107 ret = ccw_device_online(cdev);
2108 if (ret)
2109 goto out_disc_unlock;
2110
2111 cm_enabled = cdev->private->cmb != NULL;
2112 spin_unlock_irq(sch->lock);
2113
2114 wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
2115 if (cdev->private->state != DEV_STATE_ONLINE) {
2116 spin_lock_irq(sch->lock);
2117 goto out_disc_unlock;
2118 }
2119 if (cm_enabled) {
2120 ret = ccw_set_cmf(cdev, 1);
2121 if (ret) {
Sebastian Ottf0148242009-09-11 10:28:23 +02002122 CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed "
2123 "(rc=%d)\n", cdev->private->dev_id.ssid,
2124 cdev->private->dev_id.devno, ret);
Sebastian Ott823d4942009-06-16 10:30:20 +02002125 ret = 0;
2126 }
2127 }
2128
2129out_restore:
2130 if (cdev->online && cdev->drv && cdev->drv->restore)
2131 ret = cdev->drv->restore(cdev);
2132out:
2133 return ret;
2134
2135out_disc_unlock:
2136 ret = resume_handle_disc(cdev);
2137 spin_unlock_irq(sch->lock);
2138 if (ret)
2139 return ret;
2140 goto out_restore;
2141
2142out_unreg_unlock:
2143 ccw_device_schedule_sch_unregister(cdev);
2144 ret = -ENODEV;
2145out_unlock:
2146 spin_unlock_irq(sch->lock);
2147 return ret;
2148}
2149
2150static struct dev_pm_ops ccw_pm_ops = {
2151 .prepare = ccw_device_pm_prepare,
2152 .complete = ccw_device_pm_complete,
2153 .freeze = ccw_device_pm_freeze,
2154 .thaw = ccw_device_pm_thaw,
2155 .restore = ccw_device_pm_restore,
2156};
2157
Cornelia Huck8bbace72006-01-11 10:56:22 +01002158struct bus_type ccw_bus_type = {
2159 .name = "ccw",
2160 .match = ccw_bus_match,
2161 .uevent = ccw_uevent,
2162 .probe = ccw_device_probe,
2163 .remove = ccw_device_remove,
Cornelia Huck958974f2007-10-12 16:11:21 +02002164 .shutdown = ccw_device_shutdown,
Sebastian Ott823d4942009-06-16 10:30:20 +02002165 .pm = &ccw_pm_ops,
Cornelia Huck8bbace72006-01-11 10:56:22 +01002166};
2167
Cornelia Huckb2ffd8e2007-10-12 16:11:17 +02002168/**
2169 * ccw_driver_register() - register a ccw driver
2170 * @cdriver: driver to be registered
2171 *
2172 * This function is mainly a wrapper around driver_register().
2173 * Returns:
2174 * %0 on success and a negative error value on failure.
2175 */
2176int ccw_driver_register(struct ccw_driver *cdriver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177{
2178 struct device_driver *drv = &cdriver->driver;
2179
2180 drv->bus = &ccw_bus_type;
2181 drv->name = cdriver->name;
Cornelia Huck4beee642008-01-26 14:10:47 +01002182 drv->owner = cdriver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183
2184 return driver_register(drv);
2185}
2186
Cornelia Huckb2ffd8e2007-10-12 16:11:17 +02002187/**
2188 * ccw_driver_unregister() - deregister a ccw driver
2189 * @cdriver: driver to be deregistered
2190 *
2191 * This function is mainly a wrapper around driver_unregister().
2192 */
2193void ccw_driver_unregister(struct ccw_driver *cdriver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194{
2195 driver_unregister(&cdriver->driver);
2196}
2197
Cornelia Hucka8237fc2006-01-06 00:19:21 -08002198/* Helper func for qdio. */
2199struct subchannel_id
2200ccw_device_get_subchannel_id(struct ccw_device *cdev)
2201{
2202 struct subchannel *sch;
2203
2204 sch = to_subchannel(cdev->dev.parent);
2205 return sch->schid;
2206}
2207
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208MODULE_LICENSE("GPL");
2209EXPORT_SYMBOL(ccw_device_set_online);
2210EXPORT_SYMBOL(ccw_device_set_offline);
2211EXPORT_SYMBOL(ccw_driver_register);
2212EXPORT_SYMBOL(ccw_driver_unregister);
2213EXPORT_SYMBOL(get_ccwdev_by_busid);
2214EXPORT_SYMBOL(ccw_bus_type);
2215EXPORT_SYMBOL(ccw_device_work);
Cornelia Hucka8237fc2006-01-06 00:19:21 -08002216EXPORT_SYMBOL_GPL(ccw_device_get_subchannel_id);