device.c 37.6 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7
/*
 *  drivers/s390/cio/device.c
 *  bus driver for ccw devices
 *
 *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
 *			 IBM Corporation
 *    Author(s): Arnd Bergmann (arndb@de.ibm.com)
8
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
Linus Torvalds's avatar
Linus Torvalds committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22
 *		 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>

#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>
Linus Torvalds's avatar
Linus Torvalds committed
25 26

#include "cio.h"
27
#include "cio_debug.h"
Linus Torvalds's avatar
Linus Torvalds committed
28 29 30
#include "css.h"
#include "device.h"
#include "ioasm.h"
31
#include "io_sch.h"
Linus Torvalds's avatar
Linus Torvalds committed
32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

/******************* 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;
}

58 59 60
/* 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). */
61
static int snprint_alias(char *buf, size_t size,
62
			 struct ccw_device_id *id, const char *suffix)
Linus Torvalds's avatar
Linus Torvalds committed
63
{
64
	int len;
Linus Torvalds's avatar
Linus Torvalds committed
65

66
	len = snprintf(buf, size, "ccw:t%04Xm%02X", id->cu_type, id->cu_model);
67 68 69 70
	if (len > size)
		return len;
	buf += len;
	size -= len;
Linus Torvalds's avatar
Linus Torvalds committed
71

72 73 74 75 76
	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
77

78 79 80 81 82
	return len;
}

/* Set up environment variables for ccw device uevent. Return 0 on success,
 * non-zero otherwise. */
83
static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
84 85 86
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct ccw_device_id *id = &(cdev->id);
87 88
	int ret;
	char modalias_buf[30];
Linus Torvalds's avatar
Linus Torvalds committed
89

90
	/* CU_TYPE= */
91
	ret = add_uevent_var(env, "CU_TYPE=%04X", id->cu_type);
92 93
	if (ret)
		return ret;
94 95

	/* CU_MODEL= */
96
	ret = add_uevent_var(env, "CU_MODEL=%02X", id->cu_model);
97 98
	if (ret)
		return ret;
Linus Torvalds's avatar
Linus Torvalds committed
99 100

	/* The next two can be zero, that's ok for us */
101
	/* DEV_TYPE= */
102
	ret = add_uevent_var(env, "DEV_TYPE=%04X", id->dev_type);
103 104
	if (ret)
		return ret;
Linus Torvalds's avatar
Linus Torvalds committed
105

106
	/* DEV_MODEL= */
107
	ret = add_uevent_var(env, "DEV_MODEL=%02X", id->dev_model);
108 109
	if (ret)
		return ret;
110 111

	/* MODALIAS=  */
112
	snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
113 114
	ret = add_uevent_var(env, "MODALIAS=%s", modalias_buf);
	return ret;
Linus Torvalds's avatar
Linus Torvalds committed
115 116
}

117
struct bus_type ccw_bus_type;
Linus Torvalds's avatar
Linus Torvalds committed
118

119 120 121 122 123 124
static void io_subchannel_irq(struct subchannel *);
static int io_subchannel_probe(struct subchannel *);
static int io_subchannel_remove(struct subchannel *);
static int io_subchannel_notify(struct subchannel *, int);
static void io_subchannel_verify(struct subchannel *);
static void io_subchannel_ioterm(struct subchannel *);
125
static void io_subchannel_shutdown(struct subchannel *);
Linus Torvalds's avatar
Linus Torvalds committed
126

127
static struct css_driver io_subchannel_driver = {
128
	.owner = THIS_MODULE,
Linus Torvalds's avatar
Linus Torvalds committed
129
	.subchannel_type = SUBCHANNEL_TYPE_IO,
130
	.name = "io_subchannel",
Linus Torvalds's avatar
Linus Torvalds committed
131 132 133 134
	.irq = io_subchannel_irq,
	.notify = io_subchannel_notify,
	.verify = io_subchannel_verify,
	.termination = io_subchannel_ioterm,
135 136 137
	.probe = io_subchannel_probe,
	.remove = io_subchannel_remove,
	.shutdown = io_subchannel_shutdown,
Linus Torvalds's avatar
Linus Torvalds committed
138 139 140 141
};

struct workqueue_struct *ccw_device_work;
struct workqueue_struct *ccw_device_notify_work;
142 143
wait_queue_head_t ccw_device_init_wq;
atomic_t ccw_device_init_count;
Linus Torvalds's avatar
Linus Torvalds committed
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168

static int __init
init_ccw_bus_type (void)
{
	int ret;

	init_waitqueue_head(&ccw_device_init_wq);
	atomic_set(&ccw_device_init_count, 0);

	ccw_device_work = create_singlethread_workqueue("cio");
	if (!ccw_device_work)
		return -ENOMEM; /* FIXME: better errno ? */
	ccw_device_notify_work = create_singlethread_workqueue("cio_notify");
	if (!ccw_device_notify_work) {
		ret = -ENOMEM; /* FIXME: better errno ? */
		goto out_err;
	}
	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;

169 170
	ret = css_driver_register(&io_subchannel_driver);
	if (ret)
Linus Torvalds's avatar
Linus Torvalds committed
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189
		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 (ccw_device_notify_work)
		destroy_workqueue(ccw_device_notify_work);
	if (slow_path_wq)
		destroy_workqueue(slow_path_wq);
	return ret;
}

static void __exit
cleanup_ccw_bus_type (void)
{
190
	css_driver_unregister(&io_subchannel_driver);
Linus Torvalds's avatar
Linus Torvalds committed
191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
	bus_unregister(&ccw_bus_type);
	destroy_workqueue(ccw_device_notify_work);
	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
210
chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds's avatar
Linus Torvalds committed
211 212
{
	struct subchannel *sch = to_subchannel(dev);
213
	struct chsc_ssd_info *ssd = &sch->ssd_info;
Linus Torvalds's avatar
Linus Torvalds committed
214 215
	ssize_t ret = 0;
	int chp;
216 217 218 219 220 221 222 223 224
	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
225 226 227 228 229
	ret += sprintf (buf+ret, "\n");
	return min((ssize_t)PAGE_SIZE, ret);
}

static ssize_t
230
pimpampom_show (struct device * dev, struct device_attribute *attr, char * buf)
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234 235 236 237 238 239
{
	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
240
devtype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
241 242 243 244 245 246 247 248 249 250 251 252
{
	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
253
cutype_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
254 255 256 257 258 259 260 261
{
	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);
}

262 263 264 265 266
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);
267
	int len;
268

269
	len = snprint_alias(buf, PAGE_SIZE, id, "\n");
270 271

	return len > PAGE_SIZE ? PAGE_SIZE : len;
272 273
}

Linus Torvalds's avatar
Linus Torvalds committed
274
static ssize_t
275
online_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
276 277 278 279 280 281
{
	struct ccw_device *cdev = to_ccwdev(dev);

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

282 283 284 285 286
int ccw_device_is_orphan(struct ccw_device *cdev)
{
	return sch_is_pseudo_sch(to_subchannel(cdev->dev.parent));
}

287
static void ccw_device_unregister(struct ccw_device *cdev)
288 289
{
	if (test_and_clear_bit(1, &cdev->private->registered))
290
		device_del(&cdev->dev);
291 292
}

293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312
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
313 314 315
static void
ccw_device_remove_disconnected(struct ccw_device *cdev)
{
316
	unsigned long flags;
317 318
	int rc;

Linus Torvalds's avatar
Linus Torvalds committed
319 320 321 322
	/*
	 * Forced offline in disconnected state means
	 * 'throw away device'.
	 */
323
	if (ccw_device_is_orphan(cdev)) {
324 325 326 327 328
		/*
		 * Deregister ccw device.
		 * Unfortunately, we cannot do this directly from the
		 * attribute method.
		 */
329 330 331
		spin_lock_irqsave(cdev->ccwlock, flags);
		cdev->private->state = DEV_STATE_NOT_OPER;
		spin_unlock_irqrestore(cdev->ccwlock, flags);
332 333 334
		rc = device_schedule_callback(&cdev->dev,
					      ccw_device_remove_orphan_cb);
		if (rc)
Cornelia Huck's avatar
Cornelia Huck committed
335 336 337 338
			CIO_MSG_EVENT(2, "Couldn't unregister orphan "
				      "0.%x.%04x\n",
				      cdev->private->dev_id.ssid,
				      cdev->private->dev_id.devno);
339
		return;
340
	}
341 342 343 344
	/* Deregister subchannel, which will kill the ccw device. */
	rc = device_schedule_callback(cdev->dev.parent,
				      ccw_device_remove_sch_cb);
	if (rc)
Cornelia Huck's avatar
Cornelia Huck committed
345 346 347 348
		CIO_MSG_EVENT(2, "Couldn't unregister disconnected device "
			      "0.%x.%04x\n",
			      cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
349 350
}

351 352 353 354 355 356 357 358 359 360 361 362
/**
 * 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
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390
{
	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 {
Cornelia Huck's avatar
Cornelia Huck committed
391 392 393 394
		CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
395 396 397 398 399
		cdev->online = 1;
	}
 	return ret;
}

400 401 402 403 404 405 406 407 408 409 410 411 412
/**
 * 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
413 414 415 416 417 418 419 420 421 422 423 424 425 426
{
	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 {
Cornelia Huck's avatar
Cornelia Huck committed
427 428 429 430
		CIO_MSG_EVENT(2, "ccw_device_online returned %d, "
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
Linus Torvalds's avatar
Linus Torvalds committed
431 432 433 434 435 436 437 438 439 440 441 442 443
		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
444 445 446 447 448
	else
		CIO_MSG_EVENT(2, "ccw_device_offline returned %d, "
			      "device 0.%x.%04x\n",
			      ret, cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno);
449
	return (ret == 0) ? -ENODEV : ret;
Linus Torvalds's avatar
Linus Torvalds committed
450 451
}

452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467
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
468 469 470 471
			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);
472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490
			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;
}
static void online_store_handle_online(struct ccw_device *cdev, int force)
{
	int ret;

	ret = online_store_recog_and_online(cdev);
	if (ret)
		return;
	if (force && cdev->private->state == DEV_STATE_BOXED) {
		ret = ccw_device_stlck(cdev);
		if (ret) {
Cornelia Huck's avatar
Cornelia Huck committed
491 492
			dev_warn(&cdev->dev,
				 "ccw_device_stlck returned %d!\n", ret);
493 494 495 496 497 498 499 500 501 502 503
			return;
		}
		if (cdev->id.cu_type == 0)
			cdev->private->state = DEV_STATE_NOT_OPER;
		online_store_recog_and_online(cdev);
	}

}

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
504 505
{
	struct ccw_device *cdev = to_ccwdev(dev);
506
	int i, force;
Linus Torvalds's avatar
Linus Torvalds committed
507 508
	char *tmp;

509
	if (atomic_cmpxchg(&cdev->private->onoff, 0, 1) != 0)
Linus Torvalds's avatar
Linus Torvalds committed
510 511 512 513 514 515 516 517 518 519 520 521 522
		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;
	} else {
		force = 0;
		i = simple_strtoul(buf, &tmp, 16);
	}
523 524 525 526 527 528 529 530 531 532

	switch (i) {
	case 0:
		online_store_handle_offline(cdev);
		break;
	case 1:
		online_store_handle_online(cdev, force);
		break;
	default:
		count = -EINVAL;
Linus Torvalds's avatar
Linus Torvalds committed
533 534 535 536 537 538 539 540
	}
	if (cdev->drv)
		module_put(cdev->drv->owner);
	atomic_set(&cdev->private->onoff, 0);
	return count;
}

static ssize_t
541
available_show (struct device *dev, struct device_attribute *attr, char *buf)
Linus Torvalds's avatar
Linus Torvalds committed
542 543 544 545
{
	struct ccw_device *cdev = to_ccwdev(dev);
	struct subchannel *sch;

546 547
	if (ccw_device_is_orphan(cdev))
		return sprintf(buf, "no device\n");
Linus Torvalds's avatar
Linus Torvalds committed
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568
	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);
569
static DEVICE_ATTR(modalias, 0444, modalias_show, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
570 571 572 573 574 575 576 577 578 579 580 581 582 583
static DEVICE_ATTR(online, 0644, online_show, online_store);
extern struct device_attribute dev_attr_cmb_enable;
static DEVICE_ATTR(availability, 0444, available_show, NULL);

static struct attribute * subch_attrs[] = {
	&dev_attr_chpids.attr,
	&dev_attr_pimpampom.attr,
	NULL,
};

static struct attribute_group subch_attr_group = {
	.attrs = subch_attrs,
};

584 585 586 587
struct attribute_group *subch_attr_groups[] = {
	&subch_attr_group,
	NULL,
};
Linus Torvalds's avatar
Linus Torvalds committed
588 589 590 591

static struct attribute * ccwdev_attrs[] = {
	&dev_attr_devtype.attr,
	&dev_attr_cutype.attr,
592
	&dev_attr_modalias.attr,
Linus Torvalds's avatar
Linus Torvalds committed
593 594 595 596 597 598 599 600 601 602
	&dev_attr_online.attr,
	&dev_attr_cmb_enable.attr,
	&dev_attr_availability.attr,
	NULL,
};

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

603
static struct attribute_group *ccwdev_attr_groups[] = {
604 605 606
	&ccwdev_attr_group,
	NULL,
};
Linus Torvalds's avatar
Linus Torvalds committed
607 608 609

/* this is a simple abstraction for device_register that sets the
 * correct bus type and adds the bus specific files */
610
static int ccw_device_register(struct ccw_device *cdev)
Linus Torvalds's avatar
Linus Torvalds committed
611 612 613 614 615 616 617 618 619 620 621 622 623
{
	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;
}

624
struct match_data {
625
	struct ccw_dev_id dev_id;
626 627 628 629 630 631
	struct ccw_device * sibling;
};

static int
match_devno(struct device * dev, void * data)
{
632
	struct match_data * d = data;
633 634 635 636
	struct ccw_device * cdev;

	cdev = to_ccwdev(dev);
	if ((cdev->private->state == DEV_STATE_DISCONNECTED) &&
637
	    !ccw_device_is_orphan(cdev) &&
638
	    ccw_dev_id_is_equal(&cdev->private->dev_id, &d->dev_id) &&
639
	    (cdev != d->sibling))
640 641 642 643
		return 1;
	return 0;
}

644 645
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
646 647
{
	struct device *dev;
648
	struct match_data data;
Linus Torvalds's avatar
Linus Torvalds committed
649

650
	data.dev_id = *dev_id;
651
	data.sibling = sibling;
652
	dev = bus_find_device(&ccw_bus_type, NULL, &data, match_devno);
Linus Torvalds's avatar
Linus Torvalds committed
653

654
	return dev ? to_ccwdev(dev) : NULL;
Linus Torvalds's avatar
Linus Torvalds committed
655 656
}

657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678
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
679
static void
680
ccw_device_add_changed(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
681
{
682
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
683 684
	struct ccw_device *cdev;

685 686
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
687 688 689 690 691 692 693
	if (device_add(&cdev->dev)) {
		put_device(&cdev->dev);
		return;
	}
	set_bit(1, &cdev->private->registered);
}

694
void ccw_device_do_unreg_rereg(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
695
{
696
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
697 698 699
	struct ccw_device *cdev;
	struct subchannel *sch;

700 701
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
702
	sch = to_subchannel(cdev->dev.parent);
703

704
	ccw_device_unregister(cdev);
Linus Torvalds's avatar
Linus Torvalds committed
705
	PREPARE_WORK(&cdev->private->kick_work,
706
		     ccw_device_add_changed);
Linus Torvalds's avatar
Linus Torvalds committed
707 708 709 710 711 712 713 714 715 716 717 718 719
	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);
}

720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741
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;
742
	INIT_WORK(&cdev->private->kick_work, NULL);
743
	cdev->dev.groups = ccwdev_attr_groups;
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
	/* 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;
}

770 771 772 773 774
static int io_subchannel_recog(struct ccw_device *, struct subchannel *);

static void sch_attach_device(struct subchannel *sch,
			      struct ccw_device *cdev)
{
775
	css_update_ssd_info(sch);
776
	spin_lock_irq(sch->lock);
777
	sch_set_cdev(sch, cdev);
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798
	cdev->private->schid = sch->schid;
	cdev->ccwlock = sch->lock;
	device_trigger_reprobe(sch);
	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) {
		CIO_MSG_EVENT(2, "Moving disconnected device 0.%x.%04x failed "
			      "(ret=%d)!\n", cdev->private->dev_id.ssid,
			      cdev->private->dev_id.devno, ret);
		put_device(&other_sch->dev);
		return;
	}
799
	sch_set_cdev(other_sch, NULL);
800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
	/* 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);
835
	sch_set_cdev(sch, cdev);
836 837 838 839
	spin_unlock_irq(sch->lock);
	/* Start recognition for the new ccw device. */
	if (io_subchannel_recog(cdev, sch)) {
		spin_lock_irq(sch->lock);
840
		sch_set_cdev(sch, NULL);
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895
		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
896 897 898 899
/*
 * Register recognized device.
 */
static void
900
io_subchannel_register(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
901
{
902
	struct ccw_device_private *priv;
Linus Torvalds's avatar
Linus Torvalds committed
903 904 905 906 907
	struct ccw_device *cdev;
	struct subchannel *sch;
	int ret;
	unsigned long flags;

908 909
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
910
	sch = to_subchannel(cdev->dev.parent);
911
	css_update_ssd_info(sch);
912 913 914 915 916 917
	/*
	 * 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.
	 */
918
	if (klist_node_attached(&cdev->dev.knode_parent)) {
919 920 921 922
		if (!cdev->drv) {
			ret = device_reprobe(&cdev->dev);
			if (ret)
				/* We can't do much here. */
Cornelia Huck's avatar
Cornelia Huck committed
923 924 925 926
				CIO_MSG_EVENT(2, "device_reprobe() returned"
					      " %d for 0.%x.%04x\n", ret,
					      cdev->private->dev_id.ssid,
					      cdev->private->dev_id.devno);
927
		}
Linus Torvalds's avatar
Linus Torvalds committed
928 929
		goto out;
	}
930 931 932 933 934 935
	/*
	 * 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
936 937 938
	/* make it known to the system */
	ret = ccw_device_register(cdev);
	if (ret) {
Cornelia Huck's avatar
Cornelia Huck committed
939 940 941
		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
942
		put_device(&cdev->dev);
943
		spin_lock_irqsave(sch->lock, flags);
944
		sch_set_cdev(sch, NULL);
945
		spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961
		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);
}

962
static void ccw_device_call_sch_unregister(struct work_struct *work)
Linus Torvalds's avatar
Linus Torvalds committed
963
{
964 965
	struct ccw_device_private *priv;
	struct ccw_device *cdev;
Linus Torvalds's avatar
Linus Torvalds committed
966 967
	struct subchannel *sch;

968 969
	priv = container_of(work, struct ccw_device_private, kick_work);
	cdev = priv->cdev;
Linus Torvalds's avatar
Linus Torvalds committed
970
	sch = to_subchannel(cdev->dev.parent);
971
	css_sch_device_unregister(sch);
Linus Torvalds's avatar
Linus Torvalds committed
972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
	/* 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,
999
			     ccw_device_call_sch_unregister);
Linus Torvalds's avatar
Linus Torvalds committed
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
		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,
1014
			     io_subchannel_register);
Linus Torvalds's avatar
Linus Torvalds committed
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
		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;

1026
	sch_set_cdev(sch, cdev);
Linus Torvalds's avatar
Linus Torvalds committed
1027
	sch->driver = &io_subchannel_driver;
1028
	cdev->ccwlock = sch->lock;
1029

Linus Torvalds's avatar
Linus Torvalds committed
1030 1031
	/* Init private data. */
	priv = cdev->private;
1032 1033 1034
	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
1035 1036 1037 1038 1039 1040
	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. */
1041 1042
	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
1043 1044 1045 1046 1047

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

	/* Start async. device sensing. */
1048
	spin_lock_irq(sch->lock);
Linus Torvalds's avatar
Linus Torvalds committed
1049
	rc = ccw_device_recognition(cdev);
1050
	spin_unlock_irq(sch->lock);
Linus Torvalds's avatar
Linus Torvalds committed
1051 1052 1053 1054 1055 1056 1057
	if (rc) {
		if (atomic_dec_and_test(&ccw_device_init_count))
			wake_up(&ccw_device_init_wq);
	}
	return rc;
}

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085
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) {
		CIO_MSG_EVENT(2, "Moving device 0.%x.%04x to subchannel "
			      "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);
1086
		sch_set_cdev(former_parent, NULL);
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
		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);
}

1100 1101 1102 1103
static void io_subchannel_irq(struct subchannel *sch)
{
	struct ccw_device *cdev;

1104
	cdev = sch_get_cdev(sch);
1105 1106 1107 1108 1109 1110 1111

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

Linus Torvalds's avatar
Linus Torvalds committed
1112
static int
1113
io_subchannel_probe (struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1114 1115 1116 1117
{
	struct ccw_device *cdev;
	int rc;
	unsigned long flags;
1118
	struct ccw_dev_id dev_id;
Linus Torvalds's avatar
Linus Torvalds committed
1119

1120 1121
	cdev = sch_get_cdev(sch);
	if (cdev) {
Linus Torvalds's avatar
Linus Torvalds committed
1122 1123 1124 1125 1126
		/*
		 * This subchannel already has an associated ccw_device.
		 * Register it and exit. This happens for all early
		 * device, e.g. the console.
		 */
1127
		cdev->dev.groups = ccwdev_attr_groups;
Linus Torvalds's avatar
Linus Torvalds committed
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
		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;
	}
1142 1143 1144 1145 1146 1147
	/*
	 * First check if a fitting device may be found amongst the
	 * disconnected devices or in the orphanage.
	 */
	dev_id.devno = sch->schib.pmcw.dev;
	dev_id.ssid = sch->schid.ssid;
1148 1149 1150 1151 1152
	/* Allocate I/O subchannel private data. */
	sch->private = kzalloc(sizeof(struct io_subchannel_private),
			       GFP_KERNEL | GFP_DMA);
	if (!sch->private)
		return -ENOMEM;
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
	cdev = get_disc_ccwdev_by_dev_id(&dev_id, NULL);
	if (!cdev)
		cdev = get_orphaned_ccwdev_by_dev_id(to_css(sch->dev.parent),
						     &dev_id);
	if (cdev) {
		/*
		 * Schedule moving the device until when we have a registered
		 * subchannel to move to and succeed the probe. We can
		 * unregister later again, when the probe is through.
		 */
		cdev->private->sch = sch;
		PREPARE_WORK(&cdev->private->kick_work,
			     ccw_device_move_to_sch);
		queue_work(slow_path_wq, &cdev->private->kick_work);
		return 0;
	}
1169
	cdev = io_subchannel_create_ccwdev(sch);
1170 1171
	if (IS_ERR(cdev)) {
		kfree(sch->private);
1172
		return PTR_ERR(cdev);
1173
	}
1174
	rc = io_subchannel_recog(cdev, sch);
Linus Torvalds's avatar
Linus Torvalds committed
1175
	if (rc) {
1176
		spin_lock_irqsave(sch->lock, flags);
1177
		sch_set_cdev(sch, NULL);
1178
		spin_unlock_irqrestore(sch->lock, flags);
Linus Torvalds's avatar
Linus Torvalds committed
1179 1180
		if (cdev->dev.release)
			cdev->dev.release(&cdev->dev);
1181
		kfree(sch->private);
Linus Torvalds's avatar
Linus Torvalds committed
1182 1183 1184 1185 1186 1187
	}

	return rc;
}

static int
1188
io_subchannel_remove (struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1189 1190 1191 1192
{
	struct ccw_device *cdev;
	unsigned long flags;

1193 1194
	cdev = sch_get_cdev(sch);
	if (!cdev)
Linus Torvalds's avatar
Linus Torvalds committed
1195 1196 1197
		return 0;
	/* Set ccw device to not operational and drop reference. */
	spin_lock_irqsave(cdev->ccwlock, flags);
1198
	sch_set_cdev(sch, NULL);
Linus Torvalds's avatar
Linus Torvalds committed
1199 1200
	cdev->private->state = DEV_STATE_NOT_OPER;
	spin_unlock_irqrestore(cdev->ccwlock, flags);
1201 1202
	ccw_device_unregister(cdev);
	put_device(&cdev->dev);
1203
	kfree(sch->private);
Linus Torvalds's avatar
Linus Torvalds committed
1204 1205 1206
	return 0;
}

1207
static int io_subchannel_notify(struct subchannel *sch, int event)
Linus Torvalds's avatar
Linus Torvalds committed
1208 1209 1210
{
	struct ccw_device *cdev;

1211
	cdev = sch_get_cdev(sch);
Linus Torvalds's avatar
Linus Torvalds committed
1212 1213 1214 1215 1216 1217 1218 1219 1220
	if (!cdev)
		return 0;
	if (!cdev->drv)
		return 0;
	if (!cdev->online)
		return 0;
	return cdev->drv->notify ? cdev->drv->notify(cdev, event) : 0;
}

1221
static void io_subchannel_verify(struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1222 1223 1224
{
	struct ccw_device *cdev;

1225
	cdev = sch_get_cdev(sch);
Linus Torvalds's avatar
Linus Torvalds committed
1226 1227 1228 1229
	if (cdev)
		dev_fsm_event(cdev, DEV_EVENT_VERIFY);
}

1230
static void io_subchannel_ioterm(struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1231 1232 1233
{
	struct ccw_device *cdev;

1234
	cdev = sch_get_cdev(sch);
Linus Torvalds's avatar
Linus Torvalds committed
1235 1236
	if (!cdev)
		return;
1237 1238 1239
	/* Internal I/O will be retried by the interrupt handler. */
	if (cdev->private->flags.intretry)
		return;
Linus Torvalds's avatar
Linus Torvalds committed
1240 1241 1242 1243 1244 1245 1246
	cdev->private->state = DEV_STATE_CLEAR_VERIFY;
	if (cdev->handler)
		cdev->handler(cdev, cdev->private->intparm,
			      ERR_PTR(-EIO));
}

static void
1247
io_subchannel_shutdown(struct subchannel *sch)
Linus Torvalds's avatar
Linus Torvalds committed
1248 1249 1250 1251
{
	struct ccw_device *cdev;
	int ret;