device.c 45.5 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4
/*
 *  drivers/s390/cio/device.c
 *  bus driver for ccw devices
 *
Cornelia Huck's avatar
Cornelia Huck committed
5
 *    Copyright IBM Corp. 2002,2008
Linus Torvalds's avatar
Linus Torvalds committed
6
 *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
7
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds's avatar
Linus Torvalds committed
8 9 10 11 12 13 14 15 16 17 18
 *		 Martin Schwidefsky (schwidefsky@de.ibm.com)
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/device.h>
#include <linux/workqueue.h>
19
#include <linux/timer.h>
Linus Torvalds's avatar
Linus Torvalds committed
20 21 22

#include <asm/ccwdev.h>
#include <asm/cio.h>
Tim Schmielau's avatar
Tim Schmielau committed
23
#include <asm/param.h>		/* HZ */
24
#include <asm/cmb.h>
25
#include <asm/isc.h>
Linus Torvalds's avatar
Linus Torvalds committed
26

27
#include "chp.h"
Linus Torvalds's avatar
Linus Torvalds committed
28
#include "cio.h"
29
#include "cio_debug.h"
Linus Torvalds's avatar
Linus Torvalds committed
30 31 32
#include "css.h"
#include "device.h"
#include "ioasm.h"
33
#include "io_sch.h"
Linus Torvalds's avatar
Linus Torvalds committed
34

35
static struct timer_list recovery_timer;
36
static DEFINE_SPINLOCK(recovery_lock);
37 38 39
static int recovery_phase;
static const unsigned long recovery_delay[] = { 3, 30, 300 };

Linus Torvalds's avatar
Linus Torvalds committed
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
/******************* bus type handling ***********************/

/* The Linux driver model distinguishes between a bus type and
 * the bus itself. Of course we only have one channel
 * subsystem driver and one channel system per machine, but
 * we still use the abstraction. T.R. says it's a good idea. */
static int
ccw_bus_match (struct device * dev, struct device_driver * drv)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_driver *cdrv = to_ccwdrv(drv);
	const struct ccw_device_id *ids = cdrv->ids, *found;

	if (!ids)
		return 0;

	found = ccw_device_id_match(ids, &cdev->id);
	if (!found)
		return 0;

	cdev->id.driver_info = found->driver_info;

	return 1;
}

65 66 67
/* Store modalias string delimited by prefix/suffix string into buffer with
 * specified size. Return length of resulting string (excluding trailing '\0')
 * even if string doesn't fit buffer (snprintf semantics). */
68
static int snprint_alias(char *buf, size_t size,
69
			 struct ccw_device_id *id, const char *suffix)
Linus Torvalds's avatar
Linus Torvalds committed
70
{
71
	int len;
Linus Torvalds's avatar
Linus Torvalds committed
72

73
	len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
74 75 76 77
	if (len > size)
		return len;
	buf += len;
	size -= len;
Linus Torvalds's avatar
Linus Torvalds committed
78

79 80 81 82 83
	if (id->dev_type != 0)
		len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,
				id->dev_model, suffix);
	else
		len += snprintf(buf, size, "dtdm%s", suffix);
Linus Torvalds's avatar
Linus Torvalds committed
84

85 86 87 88 89
	return len;
}

/* Set up environment variables for ccw device uevent. Return 0 on success,
 * non-zero otherwise. */
90
static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
91 92 93
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_device_id *id = &(cdev->id);
94 95
	int ret;
	char modalias_buf[30];
Linus Torvalds's avatar
Linus Torvalds committed
96

97
	/* CU_TYPE= */
98
	ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
99 100
	if (ret)
		return ret;
101 102

	/* CU_MODEL= */
103
	ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
104 105
	if (ret)
		return ret;
Linus Torvalds's avatar
Linus Torvalds committed
106 107

	/* The next two can be zero, that's ok for us */
108
	/* DEV_TYPE= */
109
	ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
110 111
	if (ret)
		return ret;
Linus Torvalds's avatar
Linus Torvalds committed
112

113
	/* DEV_MODEL= */
114
	ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
115 116
	if (ret)
		return ret;
117 118

	/* MODALIAS=  */
119
	snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
120 121
	ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
122 123
}

124
struct bus_type ccw_bus_type;
Linus Torvalds's avatar
Linus Torvalds committed
125

126 127 128
static void io_subchannel_irq(struct subchannel *);
static int io_subchannel_probe(struct subchannel *);
static int io_subchannel_remove(struct subchannel *);
129
static void io_subchannel_shutdown(struct subchannel *);
Cornelia Huck's avatar
Cornelia Huck committed
130
static int io_subchannel_sch_event(struct subchannel *, int);
131 132
static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
				   int);
Linus Torvalds's avatar
Linus Torvalds committed
133

134 135 136 137 138 139
static struct css_device_id io_subchannel_ids[] = {
	{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
	{ /* end of list */ },
};
MODULE_DEVICE_TABLE(css, io_subchannel_ids);

140
static struct css_driver io_subchannel_driver = {
141
	.owner = THIS_MODULE,
142
	.subchannel_type = io_subchannel_ids,
143
	.name = "io_subchannel",
Linus Torvalds's avatar
Linus Torvalds committed
144
	.irq = io_subchannel_irq,
Cornelia Huck's avatar
Cornelia Huck committed
145 146
	.sch_event = io_subchannel_sch_event,
	.chp_event = io_subchannel_chp_event,
147 148 149
	.probe = io_subchannel_probe,
	.remove = io_subchannel_remove,
	.shutdown = io_subchannel_shutdown,
Linus Torvalds's avatar
Linus Torvalds committed
150 151 152
};

struct workqueue_struct *ccw_device_work;
153 154
wait_queue_head_t ccw_device_init_wq;
atomic_t ccw_device_init_count;
Linus Torvalds's avatar
Linus Torvalds committed
155

156 157
static void recovery_func(unsigned long data);

Linus Torvalds's avatar
Linus Torvalds committed
158 159 160 161 162 163 164
static int __init
init_ccw_bus_type (void)
{
	int ret;

	init_waitqueue_head(&ccw_device_init_wq);
	atomic_set(&ccw_device_init_count, 0);
165
	setup_timer(&recovery_timer, recovery_func, 0);
Linus Torvalds's avatar
Linus Torvalds committed
166 167 168 169 170 171 172 173 174 175 176 177

	ccw_device_work = create_singlethread_workqueue("cio");
	if (!ccw_device_work)
		return -ENOMEM; /* FIXME: better errno ? */
	slow_path_wq = create_singlethread_workqueue("kslowcrw");
	if (!slow_path_wq) {
		ret = -ENOMEM; /* FIXME: better errno ? */
		goto out_err;
	}
	if ((ret = bus_register (&ccw_bus_type)))
		goto out_err;

178 179
	ret = css_driver_register(&io_subchannel_driver);
	if (ret)
Linus Torvalds's avatar
Linus Torvalds committed
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
		goto out_err;

	wait_event(ccw_device_init_wq,
		   atomic_read(&ccw_device_init_count) == 0);
	flush_workqueue(ccw_device_work);
	return 0;
out_err:
	if (ccw_device_work)
		destroy_workqueue(ccw_device_work);
	if (slow_path_wq)
		destroy_workqueue(slow_path_wq);
	return ret;
}

static void __exit
cleanup_ccw_bus_type (void)
{
197
	css_driver_unregister(&io_subchannel_driver);
Linus Torvalds's avatar
Linus Torvalds committed
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215
	bus_unregister(&ccw_bus_type);
	destroy_workqueue(ccw_device_work);
}

subsys_initcall(init_ccw_bus_type);
module_exit(cleanup_ccw_bus_type);

/************************ device handling **************************/

/*
 * A ccw_device has some interfaces in sysfs in addition to the
 * standard ones.
 * The following entries are designed to export the information which
 * resided in 2.4 in /proc/subchannels. Subchannel and device number
 * are obvious, so they don't have an entry :)
 * TODO: Split chpids and pimpampom up? Where is "in use" in the tree?
 */
static ssize_t
216
chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds's avatar
Linus Torvalds committed
217 218
{
	struct subchannel *sch = to_subchannel(dev);
219
	struct chsc_ssd_info *ssd = &sch->ssd_info;
Linus Torvalds's avatar
Linus Torvalds committed
220 221
	ssize_t ret = 0;
	int chp;
222 223 224 225 226 227 228 229 230
	int mask;

	for (chp = 0; chp < 8; chp++) {
		mask = 0x80 >> chp;
		if (ssd->path_mask & mask)
			ret += sprintf(buf + ret, "%02x ", ssd->chpid[chp].id);
		else
			ret += sprintf(buf + ret, "00 ");
	}
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234 235
	ret += sprintf (buf+ret, "\n");
	return min((ssize_t)PAGE_SIZE, ret);
}

static ssize_t
236
pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds's avatar
Linus Torvalds committed
237 238 239 240 241 242 243 244 245
{
	struct subchannel *sch = to_subchannel(dev);
	struct pmcw *pmcw = &sch->schib.pmcw;

	return sprintf (buf, "%02x %02x %02x\n",
			pmcw->pim, pmcw->pam, pmcw->pom);
}

static ssize_t
246
devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
247 248 249 250 251 252 253 254 255 256 257 258
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_device_id *id = &(cdev->id);

	if (id->dev_type != 0)
		return sprintf(buf, "%04x/%02x\n",
				id->dev_type, id->dev_model);
	else
		return sprintf(buf, "n/a\n");
}

static ssize_t
259
cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
260 261 262 263 264 265 266 267
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_device_id *id = &(cdev->id);

	return sprintf(buf, "%04x/%02x\n",
		       id->cu_type, id->cu_model);
}

268 269 270 271 272
static ssize_t
modalias_show (struct device *dev, struct device_attribute *attr, char *buf)
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_device_id *id = &(cdev->id);
273
	int len;
274

275
	len = snprint_alias(buf, PAGE_SIZE, id, "\n");
276 277

	return len > PAGE_SIZE ? PAGE_SIZE : len;
278 279
}

Linus Torvalds's avatar
Linus Torvalds committed
280
static ssize_t
281
online_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
282 283 284 285 286 287
{
	struct ccw_device *cdev = to_ccwdev(dev);

	return sprintf(buf, cdev->online ? "1\n" : "0\n");
}

288 289 290 291 292
int ccw_device_is_orphan(struct ccw_device *cdev)
{
	return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
}

293
static void ccw_device_unregister(struct ccw_device *cdev)
294 295
{
	if (test_and_clear_bit(1, &cdev->private->registered))
296
		device_del(&cdev->dev);
297 298
}

299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318
static void ccw_device_remove_orphan_cb(struct device *dev)
{
	struct ccw_device *cdev = to_ccwdev(dev);

	ccw_device_unregister(cdev);
	put_device(&cdev->dev);
}

static void ccw_device_remove_sch_cb(struct device *dev)
{
	struct subchannel *sch;

	sch = to_subchannel(dev);
	css_sch_device_unregister(sch);
	/* Reset intparm to zeroes. */
	sch->schib.pmcw.intparm = 0;
	cio_modify(sch);
	put_device(&sch->dev);
}

Linus Torvalds's avatar
Linus Torvalds committed
319 320 321
static void
ccw_device_remove_disconnected(struct ccw_device *cdev)
{
322
	unsigned long flags;
323 324
	int rc;

Linus Torvalds's avatar
Linus Torvalds committed
325 326 327 328
	/*
	 * Forced offline in disconnected state means
	 * 'throw away device'.
	 */
329
	if (ccw_device_is_orphan(cdev)) {
330 331 332 333 334
		/*
		 * Deregister ccw device.
		 * Unfortunately, we cannot do this directly from the
		 * attribute method.
		 */
335 336 337
		spin_lock_irqsave(cdev->ccwlock, flags);
		cdev->private->state = DEV_STATE_NOT_OPER;
		spin_unlock_irqrestore(cdev->ccwlock, flags);
338 339 340
		rc = device_schedule_callback(&cdev->dev,
					      ccw_device_remove_orphan_cb);
		if (rc)
341
			CIO_MSG_EVENT(0, "Couldn't unregister orphan "
Cornelia Huck's avatar
Cornelia Huck committed
342 343 344
				      "0.%x.%04x\n",
				      cdev->private->dev_id.ssid,
				      cdev->private->dev_id.devno);
345
		return;
346
	}
347 348 349 350
	/* Deregister subchannel, which will kill the ccw device. */
	rc = device_schedule_callback(cdev->dev.parent,
				      ccw_device_remove_sch_cb);
	if (rc)
351
		CIO_MSG_EVENT(0, "Couldn't unregister disconnected device "
Cornelia Huck's avatar
Cornelia Huck committed
352 353 354
			      "0.%x.%04x\n",
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
355 356
}

357 358 359 360 361 362 363 364 365 366 367 368
/**
 * ccw_device_set_offline() - disable a ccw device for I/O
 * @cdev: target ccw device
 *
 * This function calls the driver's set_offline() function for @cdev, if
 * given, and then disables @cdev.
 * Returns:
 *   %0 on success and a negative error value on failure.
 * Context:
 *  enabled, ccw device lock not held
 */
int ccw_device_set_offline(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
{
	int ret;

	if (!cdev)
		return -ENODEV;
	if (!cdev->online || !cdev->drv)
		return -EINVAL;

	if (cdev->drv->set_offline) {
		ret = cdev->drv->set_offline(cdev);
		if (ret != 0)
			return ret;
	}
	cdev->online = 0;
	spin_lock_irq(cdev->ccwlock);
	ret = ccw_device_offline(cdev);
	if (ret == -ENODEV) {
		if (cdev->private->state != DEV_STATE_NOT_OPER) {
			cdev->private->state = DEV_STATE_OFFLINE;
			dev_fsm_event(cdev, DEV_EVENT_NOTOPER);
		}
		spin_unlock_irq(cdev->ccwlock);
		return ret;
	}
	spin_unlock_irq(cdev->ccwlock);
	if (ret == 0)
		wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
	else {
397
		CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
Cornelia Huck's avatar
Cornelia Huck committed
398 399 400
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
401 402 403 404 405
		cdev->online = 1;
	}
 	return ret;
}

406 407 408 409 410 411 412 413 414 415 416 417 418
/**
 * ccw_device_set_online() - enable a ccw device for I/O
 * @cdev: target ccw device
 *
 * This function first enables @cdev and then calls the driver's set_online()
 * function for @cdev, if given. If set_online() returns an error, @cdev is
 * disabled again.
 * Returns:
 *   %0 on success and a negative error value on failure.
 * Context:
 *  enabled, ccw device lock not held
 */
int ccw_device_set_online(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
419 420 421 422 423 424 425 426 427 428 429 430 431 432
{
	int ret;

	if (!cdev)
		return -ENODEV;
	if (cdev->online || !cdev->drv)
		return -EINVAL;

	spin_lock_irq(cdev->ccwlock);
	ret = ccw_device_online(cdev);
	spin_unlock_irq(cdev->ccwlock);
	if (ret == 0)
		wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
	else {
433
		CIO_MSG_EVENT(0, "ccw_device_online returned %d, "
Cornelia Huck's avatar
Cornelia Huck committed
434 435 436
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
437 438 439 440 441 442 443 444 445 446 447 448 449
		return ret;
	}
	if (cdev->private->state != DEV_STATE_ONLINE)
		return -ENODEV;
	if (!cdev->drv->set_online || cdev->drv->set_online(cdev) == 0) {
		cdev->online = 1;
		return 0;
	}
	spin_lock_irq(cdev->ccwlock);
	ret = ccw_device_offline(cdev);
	spin_unlock_irq(cdev->ccwlock);
	if (ret == 0)
		wait_event(cdev->private->wait_q, dev_fsm_final_state(cdev));
Cornelia Huck's avatar
Cornelia Huck committed
450
	else
451
		CIO_MSG_EVENT(0, "ccw_device_offline returned %d, "
Cornelia Huck's avatar
Cornelia Huck committed
452 453 454
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
455
	return (ret == 0) ? -ENODEV : ret;
Linus Torvalds's avatar
Linus Torvalds committed
456 457
}

458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473
static void online_store_handle_offline(struct ccw_device *cdev)
{
	if (cdev->private->state == DEV_STATE_DISCONNECTED)
		ccw_device_remove_disconnected(cdev);
	else if (cdev->drv && cdev->drv->set_offline)
		ccw_device_set_offline(cdev);
}

static int online_store_recog_and_online(struct ccw_device *cdev)
{
	int ret;

	/* Do device recognition, if needed. */
	if (cdev->id.cu_type == 0) {
		ret = ccw_device_recognition(cdev);
		if (ret) {
Cornelia Huck's avatar
Cornelia Huck committed
474 475 476 477
			CIO_MSG_EVENT(0, "Couldn't start recognition "
				      "for device 0.%x.%04x (ret=%d)\n",
				      cdev->private->dev_id.ssid,
				      cdev->private->dev_id.devno, ret);
478 479 480 481 482 483 484 485 486
			return ret;
		}
		wait_event(cdev->private->wait_q,
			   cdev->private->flags.recog_done);
	}
	if (cdev->drv && cdev->drv->set_online)
		ccw_device_set_online(cdev);
	return 0;
}
487
static int online_store_handle_online(struct ccw_device *cdev, int force)
488 489 490 491 492
{
	int ret;

	ret = online_store_recog_and_online(cdev);
	if (ret)
493
		return ret;
494 495
	if (force && cdev->private->state == DEV_STATE_BOXED) {
		ret = ccw_device_stlck(cdev);
496 497
		if (ret)
			return ret;
498 499 500 501
		if (cdev->id.cu_type == 0)
			cdev->private->state = DEV_STATE_NOT_OPER;
		online_store_recog_and_online(cdev);
	}
502
	return 0;
503 504 505 506
}

static ssize_t online_store (struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t count)
Linus Torvalds's avatar
Linus Torvalds committed
507 508
{
	struct ccw_device *cdev = to_ccwdev(dev);
509 510
	int force, ret;
	unsigned long i;
Linus Torvalds's avatar
Linus Torvalds committed
511

512
	if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
Linus Torvalds's avatar
Linus Torvalds committed
513 514 515 516 517 518 519 520 521
		return -EAGAIN;

	if (cdev->drv && !try_module_get(cdev->drv->owner)) {
		atomic_set(&cdev->private->onoff, 0);
		return -EINVAL;
	}
	if (!strncmp(buf, "force\n", count)) {
		force = 1;
		i = 1;
522
		ret = 0;
Linus Torvalds's avatar
Linus Torvalds committed
523 524
	} else {
		force = 0;
525
		ret = strict_strtoul(buf, 16, &i);
Linus Torvalds's avatar
Linus Torvalds committed
526
	}
527 528
	if (ret)
		goto out;
529 530 531
	switch (i) {
	case 0:
		online_store_handle_offline(cdev);
532
		ret = count;
533 534
		break;
	case 1:
535 536 537
		ret = online_store_handle_online(cdev, force);
		if (!ret)
			ret = count;
538 539
		break;
	default:
540
		ret = -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
541
	}
542
out:
Linus Torvalds's avatar
Linus Torvalds committed
543 544 545
	if (cdev->drv)
		module_put(cdev->drv->owner);
	atomic_set(&cdev->private->onoff, 0);
546
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
547 548 549
}

static ssize_t
550
available_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
551 552 553 554
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct subchannel *sch;

555 556
	if (ccw_device_is_orphan(cdev))
		return sprintf(buf, "no device\n");
Linus Torvalds's avatar
Linus Torvalds committed
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577
	switch (cdev->private->state) {
	case DEV_STATE_BOXED:
		return sprintf(buf, "boxed\n");
	case DEV_STATE_DISCONNECTED:
	case DEV_STATE_DISCONNECTED_SENSE_ID:
	case DEV_STATE_NOT_OPER:
		sch = to_subchannel(dev->parent);
		if (!sch->lpm)
			return sprintf(buf, "no path\n");
		else
			return sprintf(buf, "no device\n");
	default:
		/* All other states considered fine. */
		return sprintf(buf, "good\n");
	}
}

static DEVICE_ATTR(chpids, 0444, chpids_show, NULL);
static DEVICE_ATTR(pimpampom, 0444, pimpampom_show, NULL);
static DEVICE_ATTR(devtype, 0444, devtype_show, NULL);
static DEVICE_ATTR(cutype, 0444, cutype_show, NULL);
578
static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
579 580 581
static DEVICE_ATTR(online, 0644, online_show, online_store);
static DEVICE_ATTR(availability, 0444, available_show, NULL);

582
static struct attribute *io_subchannel_attrs[] = {
Linus Torvalds's avatar
Linus Torvalds committed
583 584 585 586 587
	&dev_attr_chpids.attr,
	&dev_attr_pimpampom.attr,
	NULL,
};

588 589
static struct attribute_group io_subchannel_attr_group = {
	.attrs = io_subchannel_attrs,
590
};
Linus Torvalds's avatar
Linus Torvalds committed
591 592 593 594

static struct attribute * ccwdev_attrs[] = {
	&dev_attr_devtype.attr,
	&dev_attr_cutype.attr,
595
	&dev_attr_modalias.attr,
Linus Torvalds's avatar
Linus Torvalds committed
596 597 598 599 600 601 602 603 604 605
	&dev_attr_online.attr,
	&dev_attr_cmb_enable.attr,
	&dev_attr_availability.attr,
	NULL,
};

static struct attribute_group ccwdev_attr_group = {
	.attrs = ccwdev_attrs,
};

606
static struct attribute_group *ccwdev_attr_groups[] = {
607 608 609
	&ccwdev_attr_group,
	NULL,
};
Linus Torvalds's avatar
Linus Torvalds committed
610 611 612

/* this is a simple abstraction for device_register that sets the
 * correct bus type and adds the bus specific files */
613
static int ccw_device_register(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
614 615 616 617 618 619 620 621 622 623 624 625 626
{
	struct device *dev = &cdev->dev;
	int ret;

	dev->bus = &ccw_bus_type;

	if ((ret = device_add(dev)))
		return ret;

	set_bit(1, &cdev->private->registered);
	return ret;
}

627
struct match_data {
628
	struct ccw_dev_id dev_id;
629 630 631 632 633 634
	struct ccw_device * sibling;
};

static int
match_devno(struct device * dev, void * data)
{
635
	struct match_data * d = data;
636 637 638 639
	struct ccw_device * cdev;

	cdev = to_ccwdev(dev);
	if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
640
	    !ccw_device_is_orphan(cdev) &&
641
	    ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
642
	    (cdev != d->sibling))
643 644 645 646
		return 1;
	return 0;
}

647 648
static struct ccw_device * get_disc_ccwdev_by_dev_id(struct ccw_dev_id *dev_id,
						     struct ccw_device *sibling)
Linus Torvalds's avatar
Linus Torvalds committed
649 650
{
	struct device *dev;
651
	struct match_data data;
Linus Torvalds's avatar
Linus Torvalds committed
652

653
	data.dev_id = *dev_id;
654
	data.sibling = sibling;
655
	dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
Linus Torvalds's avatar
Linus Torvalds committed
656

657
	return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds's avatar
Linus Torvalds committed
658 659
}

660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681
static int match_orphan(struct device *dev, void *data)
{
	struct ccw_dev_id *dev_id;
	struct ccw_device *cdev;

	dev_id = data;
	cdev = to_ccwdev(dev);
	return ccw_dev_id_is_equal(&cdev->private->dev_id, dev_id);
}

static struct ccw_device *
get_orphaned_ccwdev_by_dev_id(struct channel_subsystem *css,
			      struct ccw_dev_id *dev_id)
{
	struct device *dev;

	dev = device_find_child(&css->pseudo_subchannel->dev, dev_id,
				match_orphan);

	return dev ? to_ccwdev(dev) : NULL;
}

Linus Torvalds's avatar
Linus Torvalds committed
682
static void
683
ccw_device_add_changed(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
684
{
685
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
686 687
	struct ccw_device *cdev;

688 689
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
690 691 692 693 694 695 696
	if (device_add(&cdev->dev)) {
		put_device(&cdev->dev);
		return;
	}
	set_bit(1, &cdev->private->registered);
}

697
void ccw_device_do_unreg_rereg(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
698
{
699
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
700 701 702
	struct ccw_device *cdev;
	struct subchannel *sch;

703 704
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
705
	sch = to_subchannel(cdev->dev.parent);
706

707
	ccw_device_unregister(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
708
	PREPARE_WORK(&cdev->private->kick_work,
709
		     ccw_device_add_changed);
Linus Torvalds's avatar
Linus Torvalds committed
710 711 712 713 714 715 716 717 718 719 720 721 722
	queue_work(ccw_device_work, &cdev->private->kick_work);
}

static void
ccw_device_release(struct device *dev)
{
	struct ccw_device *cdev;

	cdev = to_ccwdev(dev);
	kfree(cdev->private);
	kfree(cdev);
}

723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744
static struct ccw_device * io_subchannel_allocate_dev(struct subchannel *sch)
{
	struct ccw_device *cdev;

	cdev  = kzalloc(sizeof(*cdev), GFP_KERNEL);
	if (cdev) {
		cdev->private = kzalloc(sizeof(struct ccw_device_private),
					GFP_KERNEL | GFP_DMA);
		if (cdev->private)
			return cdev;
	}
	kfree(cdev);
	return ERR_PTR(-ENOMEM);
}

static int io_subchannel_initialize_dev(struct subchannel *sch,
					struct ccw_device *cdev)
{
	cdev->private->cdev = cdev;
	atomic_set(&cdev->private->onoff, 0);
	cdev->dev.parent = &sch->dev;
	cdev->dev.release = ccw_device_release;
745
	INIT_WORK(&cdev->private->kick_work, NULL);
746
	cdev->dev.groups = ccwdev_attr_groups;
747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
	/* Do first half of device_register. */
	device_initialize(&cdev->dev);
	if (!get_device(&sch->dev)) {
		if (cdev->dev.release)
			cdev->dev.release(&cdev->dev);
		return -ENODEV;
	}
	return 0;
}

static struct ccw_device * io_subchannel_create_ccwdev(struct subchannel *sch)
{
	struct ccw_device *cdev;
	int ret;

	cdev = io_subchannel_allocate_dev(sch);
	if (!IS_ERR(cdev)) {
		ret = io_subchannel_initialize_dev(sch, cdev);
		if (ret) {
			kfree(cdev);
			cdev = ERR_PTR(ret);
		}
	}
	return cdev;
}

773 774 775 776 777
static int io_subchannel_recog(struct ccw_device *, struct subchannel *);

static void sch_attach_device(struct subchannel *sch,
			      struct ccw_device *cdev)
{
778
	css_update_ssd_info(sch);
779
	spin_lock_irq(sch->lock);
780
	sch_set_cdev(sch, cdev);
781 782
	cdev->private->schid = sch->schid;
	cdev->ccwlock = sch->lock;
Cornelia Huck's avatar
Cornelia Huck committed
783
	ccw_device_trigger_reprobe(cdev);
784 785 786 787 788 789 790 791 792 793 794 795
	spin_unlock_irq(sch->lock);
}

static void sch_attach_disconnected_device(struct subchannel *sch,
					   struct ccw_device *cdev)
{
	struct subchannel *other_sch;
	int ret;

	other_sch = to_subchannel(get_device(cdev->dev.parent));
	ret = device_move(&cdev->dev, &sch->dev);
	if (ret) {
796
		CIO_MSG_EVENT(0, "Moving disconnected device 0.%x.%04x failed "
797 798 799 800 801
			      "(ret=%d)!\n", cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, ret);
		put_device(&other_sch->dev);
		return;
	}
802
	sch_set_cdev(other_sch, NULL);
803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837
	/* No need to keep a subchannel without ccw device around. */
	css_sch_device_unregister(other_sch);
	put_device(&other_sch->dev);
	sch_attach_device(sch, cdev);
}

static void sch_attach_orphaned_device(struct subchannel *sch,
				       struct ccw_device *cdev)
{
	int ret;

	/* Try to move the ccw device to its new subchannel. */
	ret = device_move(&cdev->dev, &sch->dev);
	if (ret) {
		CIO_MSG_EVENT(0, "Moving device 0.%x.%04x from orphanage "
			      "failed (ret=%d)!\n",
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, ret);
		return;
	}
	sch_attach_device(sch, cdev);
}

static void sch_create_and_recog_new_device(struct subchannel *sch)
{
	struct ccw_device *cdev;

	/* Need to allocate a new ccw device. */
	cdev = io_subchannel_create_ccwdev(sch);
	if (IS_ERR(cdev)) {
		/* OK, we did everything we could... */
		css_sch_device_unregister(sch);
		return;
	}
	spin_lock_irq(sch->lock);
838
	sch_set_cdev(sch, cdev);
839 840 841 842
	spin_unlock_irq(sch->lock);
	/* Start recognition for the new ccw device. */
	if (io_subchannel_recog(cdev, sch)) {
		spin_lock_irq(sch->lock);
843
		sch_set_cdev(sch, NULL);
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
		spin_unlock_irq(sch->lock);
		if (cdev->dev.release)
			cdev->dev.release(&cdev->dev);
		css_sch_device_unregister(sch);
	}
}


void ccw_device_move_to_orphanage(struct work_struct *work)
{
	struct ccw_device_private *priv;
	struct ccw_device *cdev;
	struct ccw_device *replacing_cdev;
	struct subchannel *sch;
	int ret;
	struct channel_subsystem *css;
	struct ccw_dev_id dev_id;

	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
	sch = to_subchannel(cdev->dev.parent);
	css = to_css(sch->dev.parent);
	dev_id.devno = sch->schib.pmcw.dev;
	dev_id.ssid = sch->schid.ssid;

	/*
	 * Move the orphaned ccw device to the orphanage so the replacing
	 * ccw device can take its place on the subchannel.
	 */
	ret = device_move(&cdev->dev, &css->pseudo_subchannel->dev);
	if (ret) {
		CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to orphanage failed "
			      "(ret=%d)!\n", cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, ret);
		return;
	}
	cdev->ccwlock = css->pseudo_subchannel->lock;
	/*
	 * Search for the replacing ccw device
	 * - among the disconnected devices
	 * - in the orphanage
	 */
	replacing_cdev = get_disc_ccwdev_by_dev_id(&dev_id, cdev);
	if (replacing_cdev) {
		sch_attach_disconnected_device(sch, replacing_cdev);
		return;
	}
	replacing_cdev = get_orphaned_ccwdev_by_dev_id(css, &dev_id);
	if (replacing_cdev) {
		sch_attach_orphaned_device(sch, replacing_cdev);
		return;
	}
	sch_create_and_recog_new_device(sch);
}

Linus Torvalds's avatar
Linus Torvalds committed
899 900 901 902
/*
 * Register recognized device.
 */
static void
903
io_subchannel_register(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
904
{
905
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
906 907 908 909 910
	struct ccw_device *cdev;
	struct subchannel *sch;
	int ret;
	unsigned long flags;

911 912
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
913
	sch = to_subchannel(cdev->dev.parent);
914
	css_update_ssd_info(sch);
915 916 917 918 919 920
	/*
	 * io_subchannel_register() will also be called after device
	 * recognition has been done for a boxed device (which will already
	 * be registered). We need to reprobe since we may now have sense id
	 * information.
	 */
921
	if (klist_node_attached(&cdev->dev.knode_parent)) {
922 923 924 925
		if (!cdev->drv) {
			ret = device_reprobe(&cdev->dev);
			if (ret)
				/* We can't do much here. */
926
				CIO_MSG_EVENT(0, "device_reprobe() returned"
Cornelia Huck's avatar
Cornelia Huck committed
927 928 929
					      " %d for 0.%x.%04x\n", ret,
					      cdev->private->dev_id.ssid,
					      cdev->private->dev_id.devno);
930
		}
Linus Torvalds's avatar
Linus Torvalds committed
931 932
		goto out;
	}
933 934 935 936 937 938
	/*
	 * Now we know this subchannel will stay, we can throw
	 * our delayed uevent.
	 */
	sch->dev.uevent_suppress = 0;
	kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
Linus Torvalds's avatar
Linus Torvalds committed
939 940 941
	/* make it known to the system */
	ret = ccw_device_register(cdev);
	if (ret) {
Cornelia Huck's avatar
Cornelia Huck committed
942 943 944
		CIO_MSG_EVENT(0, "Could not register ccw dev 0.%x.%04x: %d\n",
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, ret);
Linus Torvalds's avatar
Linus Torvalds committed
945
		put_device(&cdev->dev);
946
		spin_lock_irqsave(sch->lock, flags);
947
		sch_set_cdev(sch, NULL);
948
		spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
		kfree (cdev->private);
		kfree (cdev);
		put_device(&sch->dev);
		if (atomic_dec_and_test(&ccw_device_init_count))
			wake_up(&ccw_device_init_wq);
		return;
	}
	put_device(&cdev->dev);
out:
	cdev->private->flags.recog_done = 1;
	put_device(&sch->dev);
	wake_up(&cdev->private->wait_q);
	if (atomic_dec_and_test(&ccw_device_init_count))
		wake_up(&ccw_device_init_wq);
}

965
static void ccw_device_call_sch_unregister(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
966
{
967 968
	struct ccw_device_private *priv;
	struct ccw_device *cdev;
Linus Torvalds's avatar
Linus Torvalds committed
969 970
	struct subchannel *sch;

971 972
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
973
	sch = to_subchannel(cdev->dev.parent);
974
	css_sch_device_unregister(sch);
Linus Torvalds's avatar
Linus Torvalds committed
975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
	/* Reset intparm to zeroes. */
	sch->schib.pmcw.intparm = 0;
	cio_modify(sch);
	put_device(&cdev->dev);
	put_device(&sch->dev);
}

/*
 * subchannel recognition done. Called from the state machine.
 */
void
io_subchannel_recog_done(struct ccw_device *cdev)
{
	struct subchannel *sch;

	if (css_init_done == 0) {
		cdev->private->flags.recog_done = 1;
		return;
	}
	switch (cdev->private->state) {
	case DEV_STATE_NOT_OPER:
		cdev->private->flags.recog_done = 1;
		/* Remove device found not operational. */
		if (!get_device(&cdev->dev))
			break;
		sch = to_subchannel(cdev->dev.parent);
		PREPARE_WORK(&cdev->private->kick_work,
1002
			     ccw_device_call_sch_unregister);
Linus Torvalds's avatar
Linus Torvalds committed
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
		queue_work(slow_path_wq, &cdev->private->kick_work);
		if (atomic_dec_and_test(&ccw_device_init_count))
			wake_up(&ccw_device_init_wq);
		break;
	case DEV_STATE_BOXED:
		/* Device did not respond in time. */
	case DEV_STATE_OFFLINE:
		/* 
		 * We can't register the device in interrupt context so
		 * we schedule a work item.
		 */
		if (!get_device(&cdev->dev))
			break;
		PREPARE_WORK(&cdev->private->kick_work,
1017
			     io_subchannel_register);
Linus Torvalds's avatar
Linus Torvalds committed
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
		queue_work(slow_path_wq, &cdev->private->kick_work);
		break;
	}
}

static int
io_subchannel_recog(struct ccw_device *cdev, struct subchannel *sch)
{
	int rc;
	struct ccw_device_private *priv;

1029
	sch_set_cdev(sch, cdev);
1030
	cdev->ccwlock = sch->lock;
1031

Linus Torvalds's avatar
Linus Torvalds committed
1032 1033
	/* Init private data. */
	priv = cdev->private;
1034 1035 1036
	priv->dev_id.devno = sch->schib.pmcw.dev;
	priv->dev_id.ssid = sch->schid.ssid;
	priv->schid = sch->schid;
Linus Torvalds's avatar
Linus Torvalds committed
1037 1038 1039 1040 1041 1042
	priv->state = DEV_STATE_NOT_OPER;
	INIT_LIST_HEAD(&priv->cmb_list);
	init_waitqueue_head(&priv->wait_q);
	init_timer(&priv->timer);

	/* Set an initial name for the device. */
1043 1044
	snprintf (cdev->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x",
		  sch->schid.ssid, sch->schib.pmcw.dev);
Linus Torvalds's avatar
Linus Torvalds committed
1045 1046 1047 1048 1049

	/* Increase counter of devices currently in recognition. */
	atomic_inc(&ccw_device_init_count);

	/* Start async. device sensing. */
1050
	spin_lock_irq(sch->lock);
Linus Torvalds's avatar
Linus Torvalds committed
1051
	rc = ccw_device_recognition(cdev);
1052
	spin_unlock_irq(sch->lock);
Linus Torvalds's avatar
Linus Torvalds committed
1053 1054 1055 1056 1057 1058 1059
	if (rc) {
		if (atomic_dec_and_test(&ccw_device_init_count))
			wake_up(&ccw_device_init_wq);
	}
	return rc;
}

1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
static void ccw_device_move_to_sch(struct work_struct *work)
{
	struct ccw_device_private *priv;
	int rc;
	struct subchannel *sch;
	struct ccw_device *cdev;
	struct subchannel *former_parent;

	priv = container_of(work, struct ccw_device_private, kick_work);
	sch = priv->sch;
	cdev = priv->cdev;
	former_parent = ccw_device_is_orphan(cdev) ?
		NULL : to_subchannel(get_device(cdev->dev.parent));
	mutex_lock(&sch->reg_mutex);
	/* Try to move the ccw device to its new subchannel. */
	rc = device_move(&cdev->dev, &sch->dev);
	mutex_unlock(&sch->reg_mutex);
	if (rc) {
1078
		CIO_MSG_EVENT(0, "Moving device 0.%x.%04x to subchannel "
1079 1080 1081 1082 1083 1084 1085 1086 1087
			      "0.%x.%04x failed (ret=%d)!\n",
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, sch->schid.ssid,
			      sch->schid.sch_no, rc);
		css_sch_device_unregister(sch);
		goto out;
	}
	if (former_parent) {
		spin_lock_irq(former_parent->lock);
1088
		sch_set_cdev(former_parent, NULL);
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101
		spin_unlock_irq(former_parent->lock);
		css_sch_device_unregister(former_parent);
		/* Reset intparm to zeroes. */
		former_parent->schib.pmcw.intparm = 0;
		cio_modify(former_parent);
	}
	sch_attach_device(sch, cdev);
out:
	if (former_parent)
		put_device(&former_parent->dev);
	put_device(&cdev->dev);
}

1102 1103 1104 1105
static void io_subchannel_irq(struct subchannel *sch)
{
	struct ccw_device *cdev;

1106
	cdev = sch_get_cdev(sch);
1107 1108 1109 1110 1111 1112 1113

	CIO_TRACE_EVENT(3, "IRQ");
	CIO_TRACE_EVENT(3, sch->dev.bus_id);
	if (cdev)
		dev_fsm_event(cdev, DEV_EVENT_INTERRUPT);
}

1114 1115 1116 1117 1118 1119 1120
static void io_subchannel_init_fields(struct subchannel *sch)
{
	if (cio_is_console(sch->schid))
		sch->opm = 0xff;
	else
		sch->opm = chp_get_sch_opm(sch);
	sch->lpm = sch->schib.pmcw.pam & sch->opm;
1121
	sch->isc = cio_is_console(sch->schid) ? CONSOLE_ISC : IO_SCH_ISC;
1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140

	CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X"
		      " - PIM = %02X, PAM = %02X, POM = %02X\n",
		      sch->schib.pmcw.dev, sch->schid.ssid,
		      sch->schid.sch_no, sch->schib.pmcw.pim,
		      sch->schib.pmcw.pam, sch->schib.pmcw.pom);
	/* Initially set up some fields in the pmcw. */
	sch->schib.pmcw.ena = 0;
	sch->schib.pmcw.csense = 1;	/* concurrent sense */
	if ((sch->lpm & (sch->lpm - 1)) != 0)
		sch->schib.pmcw.mp = 1; /* multipath mode */
	/* clean up possible residual cmf stuff */
	sch->schib.pmcw.mme = 0;
	sch->schib.pmcw.mbfc = 0;
	sch->schib.pmcw.mbi = 0;
	sch->schib.mba = 0;
}

static int io_subchannel_probe(struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1141 1142 1143 1144
{
	struct ccw_device *cdev;
	int rc;
	unsigned long flags;
1145
	struct ccw_dev_id dev_id;
Linus Torvalds's avatar
Linus Torvalds committed
1146

1147 1148
	cdev = sch_get_cdev(sch);
	if (cdev) {
1149 1150 1151 1152 1153 1154 1155
		rc = sysfs_create_group(&sch->dev.kobj,
					&io_subchannel_attr_group);
		if (rc)
			CIO_MSG_EVENT(0, "Failed to create io subchannel "
				      "attributes for subchannel "
				      "0.%x.%04x (rc=%d)\n",
				      sch->schid.ssid, sch->schid.sch_no, rc);
Linus Torvalds's avatar
Linus Torvalds committed
1156 1157
		/*
		 * This subchannel already has an associated ccw_device.
1158 1159 1160
		 * Throw the delayed uevent for the subchannel, register
		 * the ccw_device and exit. This happens for all early
		 * devices, e.g. the console.
Linus Torvalds's avatar
Linus Torvalds committed
1161
		 */
1162 1163
		sch->dev.uevent_suppress = 0;
		kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
1164
		cdev->dev.groups = ccwdev_attr_groups;
Linus Torvalds's avatar
Linus Torvalds committed
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
		device_initialize(&cdev->dev);
		ccw_device_register(cdev);
		/*
		 * Check if the device is already online. If it is
		 * the reference count needs to be corrected
		 * (see ccw_device_online and css_init_done for the
		 * ugly details).
		 */
		if (cdev->private->state != DEV_STATE_NOT_OPER &&
		    cdev->private->state != DEV_STATE_OFFLINE &&
		    cdev->private->state != DEV_STATE_BOXED)
			get_device(&cdev->dev);
		return 0;
	}