1/*
   2 * scsi_sysfs.c
   3 *
   4 * SCSI sysfs interface routines.
   5 *
   6 * Created to pull SCSI mid layer sysfs routines into one file.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/slab.h>
  11#include <linux/init.h>
  12#include <linux/blkdev.h>
  13#include <linux/device.h>
  14#include <linux/pm_runtime.h>
 
  15
  16#include <scsi/scsi.h>
  17#include <scsi/scsi_device.h>
  18#include <scsi/scsi_host.h>
  19#include <scsi/scsi_tcq.h>
 
  20#include <scsi/scsi_transport.h>
  21#include <scsi/scsi_driver.h>
 
  22
  23#include "scsi_priv.h"
  24#include "scsi_logging.h"
  25
  26static struct device_type scsi_dev_type;
  27
  28static const struct {
  29	enum scsi_device_state	value;
  30	char			*name;
  31} sdev_states[] = {
  32	{ SDEV_CREATED, "created" },
  33	{ SDEV_RUNNING, "running" },
  34	{ SDEV_CANCEL, "cancel" },
  35	{ SDEV_DEL, "deleted" },
  36	{ SDEV_QUIESCE, "quiesce" },
  37	{ SDEV_OFFLINE,	"offline" },
 
  38	{ SDEV_BLOCK,	"blocked" },
  39	{ SDEV_CREATED_BLOCK, "created-blocked" },
  40};
  41
  42const char *scsi_device_state_name(enum scsi_device_state state)
  43{
  44	int i;
  45	char *name = NULL;
  46
  47	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
  48		if (sdev_states[i].value == state) {
  49			name = sdev_states[i].name;
  50			break;
  51		}
  52	}
  53	return name;
  54}
  55
  56static const struct {
  57	enum scsi_host_state	value;
  58	char			*name;
  59} shost_states[] = {
  60	{ SHOST_CREATED, "created" },
  61	{ SHOST_RUNNING, "running" },
  62	{ SHOST_CANCEL, "cancel" },
  63	{ SHOST_DEL, "deleted" },
  64	{ SHOST_RECOVERY, "recovery" },
  65	{ SHOST_CANCEL_RECOVERY, "cancel/recovery" },
  66	{ SHOST_DEL_RECOVERY, "deleted/recovery", },
  67};
  68const char *scsi_host_state_name(enum scsi_host_state state)
  69{
  70	int i;
  71	char *name = NULL;
  72
  73	for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
  74		if (shost_states[i].value == state) {
  75			name = shost_states[i].name;
  76			break;
  77		}
  78	}
  79	return name;
  80}
  81
  82static int check_set(unsigned int *val, char *src)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  83{
  84	char *last;
  85
  86	if (strncmp(src, "-", 20) == 0) {
  87		*val = SCAN_WILD_CARD;
  88	} else {
  89		/*
  90		 * Doesn't check for int overflow
  91		 */
  92		*val = simple_strtoul(src, &last, 0);
  93		if (*last != '\0')
  94			return 1;
  95	}
  96	return 0;
  97}
  98
  99static int scsi_scan(struct Scsi_Host *shost, const char *str)
 100{
 101	char s1[15], s2[15], s3[15], junk;
 102	unsigned int channel, id, lun;
 103	int res;
 104
 105	res = sscanf(str, "%10s %10s %10s %c", s1, s2, s3, &junk);
 106	if (res != 3)
 107		return -EINVAL;
 108	if (check_set(&channel, s1))
 109		return -EINVAL;
 110	if (check_set(&id, s2))
 111		return -EINVAL;
 112	if (check_set(&lun, s3))
 113		return -EINVAL;
 114	if (shost->transportt->user_scan)
 115		res = shost->transportt->user_scan(shost, channel, id, lun);
 116	else
 117		res = scsi_scan_host_selected(shost, channel, id, lun, 1);
 
 118	return res;
 119}
 120
 121/*
 122 * shost_show_function: macro to create an attr function that can be used to
 123 * show a non-bit field.
 124 */
 125#define shost_show_function(name, field, format_string)			\
 126static ssize_t								\
 127show_##name (struct device *dev, struct device_attribute *attr, 	\
 128	     char *buf)							\
 129{									\
 130	struct Scsi_Host *shost = class_to_shost(dev);			\
 131	return snprintf (buf, 20, format_string, shost->field);		\
 132}
 133
 134/*
 135 * shost_rd_attr: macro to create a function and attribute variable for a
 136 * read only field.
 137 */
 138#define shost_rd_attr2(name, field, format_string)			\
 139	shost_show_function(name, field, format_string)			\
 140static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
 141
 142#define shost_rd_attr(field, format_string) \
 143shost_rd_attr2(field, field, format_string)
 144
 145/*
 146 * Create the actual show/store functions and data structures.
 147 */
 148
 149static ssize_t
 150store_scan(struct device *dev, struct device_attribute *attr,
 151	   const char *buf, size_t count)
 152{
 153	struct Scsi_Host *shost = class_to_shost(dev);
 154	int res;
 155
 156	res = scsi_scan(shost, buf);
 157	if (res == 0)
 158		res = count;
 159	return res;
 160};
 161static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
 162
 163static ssize_t
 164store_shost_state(struct device *dev, struct device_attribute *attr,
 165		  const char *buf, size_t count)
 166{
 167	int i;
 168	struct Scsi_Host *shost = class_to_shost(dev);
 169	enum scsi_host_state state = 0;
 170
 171	for (i = 0; i < ARRAY_SIZE(shost_states); i++) {
 172		const int len = strlen(shost_states[i].name);
 173		if (strncmp(shost_states[i].name, buf, len) == 0 &&
 174		   buf[len] == '\n') {
 175			state = shost_states[i].value;
 176			break;
 177		}
 178	}
 179	if (!state)
 180		return -EINVAL;
 181
 182	if (scsi_host_set_state(shost, state))
 183		return -EINVAL;
 184	return count;
 185}
 186
 187static ssize_t
 188show_shost_state(struct device *dev, struct device_attribute *attr, char *buf)
 189{
 190	struct Scsi_Host *shost = class_to_shost(dev);
 191	const char *name = scsi_host_state_name(shost->shost_state);
 192
 193	if (!name)
 194		return -EINVAL;
 195
 196	return snprintf(buf, 20, "%s\n", name);
 197}
 198
 199/* DEVICE_ATTR(state) clashes with dev_attr_state for sdev */
 200struct device_attribute dev_attr_hstate =
 201	__ATTR(state, S_IRUGO | S_IWUSR, show_shost_state, store_shost_state);
 202
 203static ssize_t
 204show_shost_mode(unsigned int mode, char *buf)
 205{
 206	ssize_t len = 0;
 207
 208	if (mode & MODE_INITIATOR)
 209		len = sprintf(buf, "%s", "Initiator");
 210
 211	if (mode & MODE_TARGET)
 212		len += sprintf(buf + len, "%s%s", len ? ", " : "", "Target");
 213
 214	len += sprintf(buf + len, "\n");
 215
 216	return len;
 217}
 218
 219static ssize_t
 220show_shost_supported_mode(struct device *dev, struct device_attribute *attr,
 221			  char *buf)
 222{
 223	struct Scsi_Host *shost = class_to_shost(dev);
 224	unsigned int supported_mode = shost->hostt->supported_mode;
 225
 226	if (supported_mode == MODE_UNKNOWN)
 227		/* by default this should be initiator */
 228		supported_mode = MODE_INITIATOR;
 229
 230	return show_shost_mode(supported_mode, buf);
 231}
 232
 233static DEVICE_ATTR(supported_mode, S_IRUGO | S_IWUSR, show_shost_supported_mode, NULL);
 234
 235static ssize_t
 236show_shost_active_mode(struct device *dev,
 237		       struct device_attribute *attr, char *buf)
 238{
 239	struct Scsi_Host *shost = class_to_shost(dev);
 240
 241	if (shost->active_mode == MODE_UNKNOWN)
 242		return snprintf(buf, 20, "unknown\n");
 243	else
 244		return show_shost_mode(shost->active_mode, buf);
 245}
 246
 247static DEVICE_ATTR(active_mode, S_IRUGO | S_IWUSR, show_shost_active_mode, NULL);
 248
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 249shost_rd_attr(unique_id, "%u\n");
 250shost_rd_attr(host_busy, "%hu\n");
 251shost_rd_attr(cmd_per_lun, "%hd\n");
 252shost_rd_attr(can_queue, "%hd\n");
 253shost_rd_attr(sg_tablesize, "%hu\n");
 254shost_rd_attr(sg_prot_tablesize, "%hu\n");
 255shost_rd_attr(unchecked_isa_dma, "%d\n");
 256shost_rd_attr(prot_capabilities, "%u\n");
 257shost_rd_attr(prot_guard_type, "%hd\n");
 258shost_rd_attr2(proc_name, hostt->proc_name, "%s\n");
 259
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 260static struct attribute *scsi_sysfs_shost_attrs[] = {
 
 261	&dev_attr_unique_id.attr,
 262	&dev_attr_host_busy.attr,
 263	&dev_attr_cmd_per_lun.attr,
 264	&dev_attr_can_queue.attr,
 265	&dev_attr_sg_tablesize.attr,
 266	&dev_attr_sg_prot_tablesize.attr,
 267	&dev_attr_unchecked_isa_dma.attr,
 268	&dev_attr_proc_name.attr,
 269	&dev_attr_scan.attr,
 270	&dev_attr_hstate.attr,
 271	&dev_attr_supported_mode.attr,
 272	&dev_attr_active_mode.attr,
 273	&dev_attr_prot_capabilities.attr,
 274	&dev_attr_prot_guard_type.attr,
 
 
 
 275	NULL
 276};
 277
 278struct attribute_group scsi_shost_attr_group = {
 279	.attrs =	scsi_sysfs_shost_attrs,
 280};
 281
 282const struct attribute_group *scsi_sysfs_shost_attr_groups[] = {
 283	&scsi_shost_attr_group,
 284	NULL
 285};
 286
 287static void scsi_device_cls_release(struct device *class_dev)
 288{
 289	struct scsi_device *sdev;
 290
 291	sdev = class_to_sdev(class_dev);
 292	put_device(&sdev->sdev_gendev);
 293}
 294
 295static void scsi_device_dev_release_usercontext(struct work_struct *work)
 296{
 297	struct scsi_device *sdev;
 298	struct device *parent;
 299	struct scsi_target *starget;
 300	struct list_head *this, *tmp;
 
 
 
 301	unsigned long flags;
 302
 303	sdev = container_of(work, struct scsi_device, ew.work);
 
 
 304
 305	parent = sdev->sdev_gendev.parent;
 306	starget = to_scsi_target(parent);
 307
 308	spin_lock_irqsave(sdev->host->host_lock, flags);
 309	starget->reap_ref++;
 310	list_del(&sdev->siblings);
 311	list_del(&sdev->same_target_siblings);
 312	list_del(&sdev->starved_entry);
 313	spin_unlock_irqrestore(sdev->host->host_lock, flags);
 314
 315	cancel_work_sync(&sdev->event_work);
 316
 317	list_for_each_safe(this, tmp, &sdev->event_list) {
 318		struct scsi_event *evt;
 319
 320		evt = list_entry(this, struct scsi_event, node);
 321		list_del(&evt->node);
 322		kfree(evt);
 323	}
 324
 325	blk_put_queue(sdev->request_queue);
 326	/* NULL queue means the device can't be used */
 327	sdev->request_queue = NULL;
 328
 329	scsi_target_reap(scsi_target(sdev));
 330
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 331	kfree(sdev->inquiry);
 332	kfree(sdev);
 333
 334	if (parent)
 335		put_device(parent);
 336}
 337
 338static void scsi_device_dev_release(struct device *dev)
 339{
 340	struct scsi_device *sdp = to_scsi_device(dev);
 341	execute_in_process_context(scsi_device_dev_release_usercontext,
 342				   &sdp->ew);
 343}
 344
 345static struct class sdev_class = {
 346	.name		= "scsi_device",
 347	.dev_release	= scsi_device_cls_release,
 348};
 349
 350/* all probing is done in the individual ->probe routines */
 351static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
 352{
 353	struct scsi_device *sdp;
 354
 355	if (dev->type != &scsi_dev_type)
 356		return 0;
 357
 358	sdp = to_scsi_device(dev);
 359	if (sdp->no_uld_attach)
 360		return 0;
 361	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 362}
 363
 364static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 365{
 366	struct scsi_device *sdev;
 367
 368	if (dev->type != &scsi_dev_type)
 369		return 0;
 370
 371	sdev = to_scsi_device(dev);
 372
 373	add_uevent_var(env, "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
 374	return 0;
 375}
 376
 377struct bus_type scsi_bus_type = {
 378        .name		= "scsi",
 379        .match		= scsi_bus_match,
 380	.uevent		= scsi_bus_uevent,
 381#ifdef CONFIG_PM
 382	.pm		= &scsi_bus_pm_ops,
 383#endif
 384};
 385EXPORT_SYMBOL_GPL(scsi_bus_type);
 386
 387int scsi_sysfs_register(void)
 388{
 389	int error;
 390
 391	error = bus_register(&scsi_bus_type);
 392	if (!error) {
 393		error = class_register(&sdev_class);
 394		if (error)
 395			bus_unregister(&scsi_bus_type);
 396	}
 397
 398	return error;
 399}
 400
 401void scsi_sysfs_unregister(void)
 402{
 403	class_unregister(&sdev_class);
 404	bus_unregister(&scsi_bus_type);
 405}
 406
 407/*
 408 * sdev_show_function: macro to create an attr function that can be used to
 409 * show a non-bit field.
 410 */
 411#define sdev_show_function(field, format_string)				\
 412static ssize_t								\
 413sdev_show_##field (struct device *dev, struct device_attribute *attr,	\
 414		   char *buf)						\
 415{									\
 416	struct scsi_device *sdev;					\
 417	sdev = to_scsi_device(dev);					\
 418	return snprintf (buf, 20, format_string, sdev->field);		\
 419}									\
 420
 421/*
 422 * sdev_rd_attr: macro to create a function and attribute variable for a
 423 * read only field.
 424 */
 425#define sdev_rd_attr(field, format_string)				\
 426	sdev_show_function(field, format_string)			\
 427static DEVICE_ATTR(field, S_IRUGO, sdev_show_##field, NULL);
 428
 429
 430/*
 431 * sdev_rw_attr: create a function and attribute variable for a
 432 * read/write field.
 433 */
 434#define sdev_rw_attr(field, format_string)				\
 435	sdev_show_function(field, format_string)				\
 436									\
 437static ssize_t								\
 438sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
 439		    const char *buf, size_t count)			\
 440{									\
 441	struct scsi_device *sdev;					\
 442	sdev = to_scsi_device(dev);					\
 443	sscanf (buf, format_string, &sdev->field);			\
 444	return count;							\
 445}									\
 446static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 447
 448/* Currently we don't export bit fields, but we might in future,
 449 * so leave this code in */
 450#if 0
 451/*
 452 * sdev_rd_attr: create a function and attribute variable for a
 453 * read/write bit field.
 454 */
 455#define sdev_rw_attr_bit(field)						\
 456	sdev_show_function(field, "%d\n")					\
 457									\
 458static ssize_t								\
 459sdev_store_##field (struct device *dev, struct device_attribute *attr,	\
 460		    const char *buf, size_t count)			\
 461{									\
 462	int ret;							\
 463	struct scsi_device *sdev;					\
 464	ret = scsi_sdev_check_buf_bit(buf);				\
 465	if (ret >= 0)	{						\
 466		sdev = to_scsi_device(dev);				\
 467		sdev->field = ret;					\
 468		ret = count;						\
 469	}								\
 470	return ret;							\
 471}									\
 472static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
 473
 474/*
 475 * scsi_sdev_check_buf_bit: return 0 if buf is "0", return 1 if buf is "1",
 476 * else return -EINVAL.
 477 */
 478static int scsi_sdev_check_buf_bit(const char *buf)
 479{
 480	if ((buf[1] == '\0') || ((buf[1] == '\n') && (buf[2] == '\0'))) {
 481		if (buf[0] == '1')
 482			return 1;
 483		else if (buf[0] == '0')
 484			return 0;
 485		else 
 486			return -EINVAL;
 487	} else
 488		return -EINVAL;
 489}
 490#endif
 491/*
 492 * Create the actual show/store functions and data structures.
 493 */
 494sdev_rd_attr (device_blocked, "%d\n");
 495sdev_rd_attr (queue_depth, "%d\n");
 496sdev_rd_attr (type, "%d\n");
 497sdev_rd_attr (scsi_level, "%d\n");
 498sdev_rd_attr (vendor, "%.8s\n");
 499sdev_rd_attr (model, "%.16s\n");
 500sdev_rd_attr (rev, "%.4s\n");
 501
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 502/*
 503 * TODO: can we make these symlinks to the block layer ones?
 504 */
 505static ssize_t
 506sdev_show_timeout (struct device *dev, struct device_attribute *attr, char *buf)
 507{
 508	struct scsi_device *sdev;
 509	sdev = to_scsi_device(dev);
 510	return snprintf(buf, 20, "%d\n", sdev->request_queue->rq_timeout / HZ);
 511}
 512
 513static ssize_t
 514sdev_store_timeout (struct device *dev, struct device_attribute *attr,
 515		    const char *buf, size_t count)
 516{
 517	struct scsi_device *sdev;
 518	int timeout;
 519	sdev = to_scsi_device(dev);
 520	sscanf (buf, "%d\n", &timeout);
 521	blk_queue_rq_timeout(sdev->request_queue, timeout * HZ);
 522	return count;
 523}
 524static DEVICE_ATTR(timeout, S_IRUGO | S_IWUSR, sdev_show_timeout, sdev_store_timeout);
 525
 526static ssize_t
 527store_rescan_field (struct device *dev, struct device_attribute *attr,
 
 
 
 
 
 
 
 
 528		    const char *buf, size_t count)
 529{
 530	scsi_rescan_device(dev);
 
 
 
 
 
 
 
 
 
 
 
 
 531	return count;
 532}
 533static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
 534
 535static void sdev_store_delete_callback(struct device *dev)
 
 
 536{
 537	scsi_remove_device(to_scsi_device(dev));
 
 538}
 
 539
 540static ssize_t
 541sdev_store_delete(struct device *dev, struct device_attribute *attr,
 542		  const char *buf, size_t count)
 543{
 544	int rc;
 
 
 
 
 
 
 
 
 545
 546	/* An attribute cannot be unregistered by one of its own methods,
 547	 * so we have to use this roundabout approach.
 
 
 
 
 
 
 
 
 
 548	 */
 549	rc = device_schedule_callback(dev, sdev_store_delete_callback);
 550	if (rc)
 551		count = rc;
 
 
 552	return count;
 553};
 554static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);
 555
 556static ssize_t
 557store_state_field(struct device *dev, struct device_attribute *attr,
 558		  const char *buf, size_t count)
 559{
 560	int i;
 561	struct scsi_device *sdev = to_scsi_device(dev);
 562	enum scsi_device_state state = 0;
 
 563
 564	for (i = 0; i < ARRAY_SIZE(sdev_states); i++) {
 565		const int len = strlen(sdev_states[i].name);
 566		if (strncmp(sdev_states[i].name, buf, len) == 0 &&
 567		   buf[len] == '\n') {
 568			state = sdev_states[i].value;
 569			break;
 570		}
 571	}
 572	if (!state)
 
 
 
 
 573		return -EINVAL;
 
 574
 575	if (scsi_device_set_state(sdev, state))
 
 
 
 
 
 
 576		return -EINVAL;
 577	return count;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 578}
 579
 580static ssize_t
 581show_state_field(struct device *dev, struct device_attribute *attr, char *buf)
 582{
 583	struct scsi_device *sdev = to_scsi_device(dev);
 584	const char *name = scsi_device_state_name(sdev->sdev_state);
 585
 586	if (!name)
 587		return -EINVAL;
 588
 589	return snprintf(buf, 20, "%s\n", name);
 590}
 591
 592static DEVICE_ATTR(state, S_IRUGO | S_IWUSR, show_state_field, store_state_field);
 593
 594static ssize_t
 595show_queue_type_field(struct device *dev, struct device_attribute *attr,
 596		      char *buf)
 597{
 598	struct scsi_device *sdev = to_scsi_device(dev);
 599	const char *name = "none";
 600
 601	if (sdev->ordered_tags)
 602		name = "ordered";
 603	else if (sdev->simple_tags)
 604		name = "simple";
 605
 606	return snprintf(buf, 20, "%s\n", name);
 607}
 608
 609static DEVICE_ATTR(queue_type, S_IRUGO, show_queue_type_field, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 610
 611static ssize_t
 612show_iostat_counterbits(struct device *dev, struct device_attribute *attr, 				char *buf)
 
 613{
 614	return snprintf(buf, 20, "%d\n", (int)sizeof(atomic_t) * 8);
 615}
 616
 617static DEVICE_ATTR(iocounterbits, S_IRUGO, show_iostat_counterbits, NULL);
 618
 619#define show_sdev_iostat(field)						\
 620static ssize_t								\
 621show_iostat_##field(struct device *dev, struct device_attribute *attr,	\
 622		    char *buf)						\
 623{									\
 624	struct scsi_device *sdev = to_scsi_device(dev);			\
 625	unsigned long long count = atomic_read(&sdev->field);		\
 626	return snprintf(buf, 20, "0x%llx\n", count);			\
 627}									\
 628static DEVICE_ATTR(field, S_IRUGO, show_iostat_##field, NULL)
 629
 630show_sdev_iostat(iorequest_cnt);
 631show_sdev_iostat(iodone_cnt);
 632show_sdev_iostat(ioerr_cnt);
 
 633
 634static ssize_t
 635sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
 636{
 637	struct scsi_device *sdev;
 638	sdev = to_scsi_device(dev);
 639	return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
 640}
 641static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 642
 643#define DECLARE_EVT_SHOW(name, Cap_name)				\
 644static ssize_t								\
 645sdev_show_evt_##name(struct device *dev, struct device_attribute *attr,	\
 646		     char *buf)						\
 647{									\
 648	struct scsi_device *sdev = to_scsi_device(dev);			\
 649	int val = test_bit(SDEV_EVT_##Cap_name, sdev->supported_events);\
 650	return snprintf(buf, 20, "%d\n", val);				\
 651}
 652
 653#define DECLARE_EVT_STORE(name, Cap_name)				\
 654static ssize_t								\
 655sdev_store_evt_##name(struct device *dev, struct device_attribute *attr,\
 656		      const char *buf, size_t count)			\
 657{									\
 658	struct scsi_device *sdev = to_scsi_device(dev);			\
 659	int val = simple_strtoul(buf, NULL, 0);				\
 660	if (val == 0)							\
 661		clear_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
 662	else if (val == 1)						\
 663		set_bit(SDEV_EVT_##Cap_name, sdev->supported_events);	\
 664	else								\
 665		return -EINVAL;						\
 666	return count;							\
 667}
 668
 669#define DECLARE_EVT(name, Cap_name)					\
 670	DECLARE_EVT_SHOW(name, Cap_name)				\
 671	DECLARE_EVT_STORE(name, Cap_name)				\
 672	static DEVICE_ATTR(evt_##name, S_IRUGO, sdev_show_evt_##name,	\
 673			   sdev_store_evt_##name);
 674#define REF_EVT(name) &dev_attr_evt_##name.attr
 675
 676DECLARE_EVT(media_change, MEDIA_CHANGE)
 677
 678/* Default template for device attributes.  May NOT be modified */
 679static struct attribute *scsi_sdev_attrs[] = {
 680	&dev_attr_device_blocked.attr,
 681	&dev_attr_type.attr,
 682	&dev_attr_scsi_level.attr,
 683	&dev_attr_vendor.attr,
 684	&dev_attr_model.attr,
 685	&dev_attr_rev.attr,
 686	&dev_attr_rescan.attr,
 687	&dev_attr_delete.attr,
 688	&dev_attr_state.attr,
 689	&dev_attr_timeout.attr,
 690	&dev_attr_iocounterbits.attr,
 691	&dev_attr_iorequest_cnt.attr,
 692	&dev_attr_iodone_cnt.attr,
 693	&dev_attr_ioerr_cnt.attr,
 694	&dev_attr_modalias.attr,
 695	REF_EVT(media_change),
 696	NULL
 697};
 698
 699static struct attribute_group scsi_sdev_attr_group = {
 700	.attrs =	scsi_sdev_attrs,
 701};
 702
 703static const struct attribute_group *scsi_sdev_attr_groups[] = {
 704	&scsi_sdev_attr_group,
 705	NULL
 706};
 707
 708static ssize_t
 709sdev_store_queue_depth_rw(struct device *dev, struct device_attribute *attr,
 710			  const char *buf, size_t count)
 711{
 712	int depth, retval;
 713	struct scsi_device *sdev = to_scsi_device(dev);
 714	struct scsi_host_template *sht = sdev->host->hostt;
 715
 716	if (!sht->change_queue_depth)
 717		return -EINVAL;
 718
 719	depth = simple_strtoul(buf, NULL, 0);
 720
 721	if (depth < 1)
 722		return -EINVAL;
 723
 724	retval = sht->change_queue_depth(sdev, depth,
 725					 SCSI_QDEPTH_DEFAULT);
 726	if (retval < 0)
 727		return retval;
 728
 729	sdev->max_queue_depth = sdev->queue_depth;
 730
 731	return count;
 732}
 
 733
 734static struct device_attribute sdev_attr_queue_depth_rw =
 735	__ATTR(queue_depth, S_IRUGO | S_IWUSR, sdev_show_queue_depth,
 736	       sdev_store_queue_depth_rw);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 737
 738static ssize_t
 739sdev_show_queue_ramp_up_period(struct device *dev,
 740			       struct device_attribute *attr,
 741			       char *buf)
 742{
 743	struct scsi_device *sdev;
 744	sdev = to_scsi_device(dev);
 745	return snprintf(buf, 20, "%u\n",
 746			jiffies_to_msecs(sdev->queue_ramp_up_period));
 747}
 748
 749static ssize_t
 750sdev_store_queue_ramp_up_period(struct device *dev,
 751				struct device_attribute *attr,
 752				const char *buf, size_t count)
 753{
 754	struct scsi_device *sdev = to_scsi_device(dev);
 755	unsigned long period;
 756
 757	if (strict_strtoul(buf, 10, &period))
 758		return -EINVAL;
 759
 760	sdev->queue_ramp_up_period = msecs_to_jiffies(period);
 761	return period;
 762}
 763
 764static struct device_attribute sdev_attr_queue_ramp_up_period =
 765	__ATTR(queue_ramp_up_period, S_IRUGO | S_IWUSR,
 766	       sdev_show_queue_ramp_up_period,
 767	       sdev_store_queue_ramp_up_period);
 768
 769static ssize_t
 770sdev_store_queue_type_rw(struct device *dev, struct device_attribute *attr,
 771			 const char *buf, size_t count)
 772{
 
 773	struct scsi_device *sdev = to_scsi_device(dev);
 774	struct scsi_host_template *sht = sdev->host->hostt;
 775	int tag_type = 0, retval;
 776	int prev_tag_type = scsi_get_tag_type(sdev);
 777
 778	if (!sdev->tagged_supported || !sht->change_queue_type)
 779		return -EINVAL;
 780
 781	if (strncmp(buf, "ordered", 7) == 0)
 782		tag_type = MSG_ORDERED_TAG;
 783	else if (strncmp(buf, "simple", 6) == 0)
 784		tag_type = MSG_SIMPLE_TAG;
 785	else if (strncmp(buf, "none", 4) != 0)
 786		return -EINVAL;
 787
 788	if (tag_type == prev_tag_type)
 789		return count;
 
 790
 791	retval = sht->change_queue_type(sdev, tag_type);
 792	if (retval < 0)
 793		return retval;
 794
 795	return count;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 796}
 797
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 798static int scsi_target_add(struct scsi_target *starget)
 799{
 800	int error;
 801
 802	if (starget->state != STARGET_CREATED)
 803		return 0;
 804
 805	error = device_add(&starget->dev);
 806	if (error) {
 807		dev_err(&starget->dev, "target device_add failed, error %d\n", error);
 808		return error;
 809	}
 810	transport_add_device(&starget->dev);
 811	starget->state = STARGET_RUNNING;
 812
 813	pm_runtime_set_active(&starget->dev);
 814	pm_runtime_enable(&starget->dev);
 815	device_enable_async_suspend(&starget->dev);
 816
 817	return 0;
 818}
 819
 820static struct device_attribute sdev_attr_queue_type_rw =
 821	__ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
 822	       sdev_store_queue_type_rw);
 823
 824/**
 825 * scsi_sysfs_add_sdev - add scsi device to sysfs
 826 * @sdev:	scsi_device to add
 827 *
 828 * Return value:
 829 * 	0 on Success / non-zero on Failure
 830 **/
 831int scsi_sysfs_add_sdev(struct scsi_device *sdev)
 832{
 833	int error, i;
 834	struct request_queue *rq = sdev->request_queue;
 835	struct scsi_target *starget = sdev->sdev_target;
 836
 837	error = scsi_device_set_state(sdev, SDEV_RUNNING);
 838	if (error)
 839		return error;
 840
 841	error = scsi_target_add(starget);
 842	if (error)
 843		return error;
 844
 845	transport_configure_device(&starget->dev);
 846
 847	device_enable_async_suspend(&sdev->sdev_gendev);
 848	scsi_autopm_get_target(starget);
 849	pm_runtime_set_active(&sdev->sdev_gendev);
 850	pm_runtime_forbid(&sdev->sdev_gendev);
 
 851	pm_runtime_enable(&sdev->sdev_gendev);
 852	scsi_autopm_put_target(starget);
 853
 854	/* The following call will keep sdev active indefinitely, until
 855	 * its driver does a corresponding scsi_autopm_pm_device().  Only
 856	 * drivers supporting autosuspend will do this.
 857	 */
 858	scsi_autopm_get_device(sdev);
 859
 
 
 860	error = device_add(&sdev->sdev_gendev);
 861	if (error) {
 862		sdev_printk(KERN_INFO, sdev,
 863				"failed to add device: %d\n", error);
 864		return error;
 865	}
 
 866	device_enable_async_suspend(&sdev->sdev_dev);
 867	error = device_add(&sdev->sdev_dev);
 868	if (error) {
 869		sdev_printk(KERN_INFO, sdev,
 870				"failed to add class device: %d\n", error);
 871		device_del(&sdev->sdev_gendev);
 872		return error;
 873	}
 874	transport_add_device(&sdev->sdev_gendev);
 875	sdev->is_visible = 1;
 876
 877	/* create queue files, which may be writable, depending on the host */
 878	if (sdev->host->hostt->change_queue_depth) {
 879		error = device_create_file(&sdev->sdev_gendev,
 880					   &sdev_attr_queue_depth_rw);
 881		error = device_create_file(&sdev->sdev_gendev,
 882					   &sdev_attr_queue_ramp_up_period);
 883	}
 884	else
 885		error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_depth);
 886	if (error)
 887		return error;
 888
 889	if (sdev->host->hostt->change_queue_type)
 890		error = device_create_file(&sdev->sdev_gendev, &sdev_attr_queue_type_rw);
 891	else
 892		error = device_create_file(&sdev->sdev_gendev, &dev_attr_queue_type);
 893	if (error)
 894		return error;
 895
 896	error = bsg_register_queue(rq, &sdev->sdev_gendev, NULL, NULL);
 897
 898	if (error)
 899		/* we're treating error on bsg register as non-fatal,
 900		 * so pretend nothing went wrong */
 901		sdev_printk(KERN_INFO, sdev,
 902			    "Failed to register bsg queue, errno=%d\n", error);
 903
 904	/* add additional host specific attributes */
 905	if (sdev->host->hostt->sdev_attrs) {
 906		for (i = 0; sdev->host->hostt->sdev_attrs[i]; i++) {
 907			error = device_create_file(&sdev->sdev_gendev,
 908					sdev->host->hostt->sdev_attrs[i]);
 909			if (error)
 910				return error;
 911		}
 912	}
 913
 
 914	return error;
 915}
 916
 917void __scsi_remove_device(struct scsi_device *sdev)
 918{
 919	struct device *dev = &sdev->sdev_gendev;
 
 
 
 
 
 
 
 
 
 920
 921	if (sdev->is_visible) {
 922		if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 923			return;
 924
 925		bsg_unregister_queue(sdev->request_queue);
 
 926		device_unregister(&sdev->sdev_dev);
 927		transport_remove_device(dev);
 928		device_del(dev);
 929	} else
 930		put_device(&sdev->sdev_dev);
 
 
 
 
 
 
 
 931	scsi_device_set_state(sdev, SDEV_DEL);
 
 
 
 
 
 
 932	if (sdev->host->hostt->slave_destroy)
 933		sdev->host->hostt->slave_destroy(sdev);
 934	transport_destroy_device(dev);
 935
 936	/* cause the request function to reject all I/O requests */
 937	sdev->request_queue->queuedata = NULL;
 
 
 
 
 938
 939	/* Freeing the queue signals to block that we're done */
 940	scsi_free_queue(sdev->request_queue);
 941	put_device(dev);
 942}
 943
 944/**
 945 * scsi_remove_device - unregister a device from the scsi bus
 946 * @sdev:	scsi_device to unregister
 947 **/
 948void scsi_remove_device(struct scsi_device *sdev)
 949{
 950	struct Scsi_Host *shost = sdev->host;
 951
 952	mutex_lock(&shost->scan_mutex);
 953	__scsi_remove_device(sdev);
 954	mutex_unlock(&shost->scan_mutex);
 955}
 956EXPORT_SYMBOL(scsi_remove_device);
 957
 958static void __scsi_remove_target(struct scsi_target *starget)
 959{
 960	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 961	unsigned long flags;
 962	struct scsi_device *sdev;
 963
 964	spin_lock_irqsave(shost->host_lock, flags);
 965	starget->reap_ref++;
 966 restart:
 967	list_for_each_entry(sdev, &shost->__devices, siblings) {
 
 
 
 
 
 
 968		if (sdev->channel != starget->channel ||
 969		    sdev->id != starget->id ||
 970		    scsi_device_get(sdev))
 
 
 
 971			continue;
 972		spin_unlock_irqrestore(shost->host_lock, flags);
 973		scsi_remove_device(sdev);
 974		scsi_device_put(sdev);
 975		spin_lock_irqsave(shost->host_lock, flags);
 976		goto restart;
 977	}
 978	spin_unlock_irqrestore(shost->host_lock, flags);
 979	scsi_target_reap(starget);
 980}
 981
 982static int __remove_child (struct device * dev, void * data)
 983{
 984	if (scsi_is_target_device(dev))
 985		__scsi_remove_target(to_scsi_target(dev));
 986	return 0;
 987}
 988
 989/**
 990 * scsi_remove_target - try to remove a target and all its devices
 991 * @dev: generic starget or parent of generic stargets to be removed
 992 *
 993 * Note: This is slightly racy.  It is possible that if the user
 994 * requests the addition of another device then the target won't be
 995 * removed.
 996 */
 997void scsi_remove_target(struct device *dev)
 998{
 999	if (scsi_is_target_device(dev)) {
1000		__scsi_remove_target(to_scsi_target(dev));
1001		return;
1002	}
1003
1004	get_device(dev);
1005	device_for_each_child(dev, NULL, __remove_child);
1006	put_device(dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1007}
1008EXPORT_SYMBOL(scsi_remove_target);
1009
1010int scsi_register_driver(struct device_driver *drv)
1011{
1012	drv->bus = &scsi_bus_type;
1013
1014	return driver_register(drv);
1015}
1016EXPORT_SYMBOL(scsi_register_driver);
1017
1018int scsi_register_interface(struct class_interface *intf)
1019{
1020	intf->class = &sdev_class;
1021
1022	return class_interface_register(intf);
1023}
1024EXPORT_SYMBOL(scsi_register_interface);
1025
1026/**
1027 * scsi_sysfs_add_host - add scsi host to subsystem
1028 * @shost:     scsi host struct to add to subsystem
1029 **/
1030int scsi_sysfs_add_host(struct Scsi_Host *shost)
1031{
1032	int error, i;
1033
1034	/* add host specific attributes */
1035	if (shost->hostt->shost_attrs) {
1036		for (i = 0; shost->hostt->shost_attrs[i]; i++) {
1037			error = device_create_file(&shost->shost_dev,
1038					shost->hostt->shost_attrs[i]);
1039			if (error)
1040				return error;
1041		}
1042	}
1043
1044	transport_register_device(&shost->shost_gendev);
1045	transport_configure_device(&shost->shost_gendev);
1046	return 0;
1047}
1048
1049static struct device_type scsi_dev_type = {
1050	.name =		"scsi_device",
1051	.release =	scsi_device_dev_release,
1052	.groups =	scsi_sdev_attr_groups,
1053};
1054
1055void scsi_sysfs_device_initialize(struct scsi_device *sdev)
1056{
1057	unsigned long flags;
1058	struct Scsi_Host *shost = sdev->host;
 
1059	struct scsi_target  *starget = sdev->sdev_target;
1060
1061	device_initialize(&sdev->sdev_gendev);
1062	sdev->sdev_gendev.bus = &scsi_bus_type;
1063	sdev->sdev_gendev.type = &scsi_dev_type;
1064	dev_set_name(&sdev->sdev_gendev, "%d:%d:%d:%d",
 
1065		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
 
1066
1067	device_initialize(&sdev->sdev_dev);
1068	sdev->sdev_dev.parent = get_device(&sdev->sdev_gendev);
1069	sdev->sdev_dev.class = &sdev_class;
1070	dev_set_name(&sdev->sdev_dev, "%d:%d:%d:%d",
1071		     sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
 
 
 
 
 
 
 
1072	sdev->scsi_level = starget->scsi_level;
 
 
 
 
 
1073	transport_setup_device(&sdev->sdev_gendev);
1074	spin_lock_irqsave(shost->host_lock, flags);
1075	list_add_tail(&sdev->same_target_siblings, &starget->devices);
1076	list_add_tail(&sdev->siblings, &shost->__devices);
1077	spin_unlock_irqrestore(shost->host_lock, flags);
 
 
 
 
 
 
1078}
1079
1080int scsi_is_sdev_device(const struct device *dev)
1081{
1082	return dev->type == &scsi_dev_type;
1083}
1084EXPORT_SYMBOL(scsi_is_sdev_device);
1085
1086/* A blank transport template that is used in drivers that don't
1087 * yet implement Transport Attributes */
1088struct scsi_transport_template blank_transport_template = { { { {NULL, }, }, }, };