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/drivers/scsi/scsi_transport_spi.c

http://github.com/mirrors/linux
C | 1629 lines | 1249 code | 234 blank | 146 comment | 259 complexity | 4377a0b09b606b63d9073598e7136536 MD5 | raw file
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* 
   3 *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   4 *
   5 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   6 *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   7 */
   8#include <linux/ctype.h>
   9#include <linux/init.h>
  10#include <linux/module.h>
  11#include <linux/workqueue.h>
  12#include <linux/blkdev.h>
  13#include <linux/mutex.h>
  14#include <linux/sysfs.h>
  15#include <linux/slab.h>
  16#include <linux/suspend.h>
  17#include <scsi/scsi.h>
  18#include "scsi_priv.h"
  19#include <scsi/scsi_device.h>
  20#include <scsi/scsi_host.h>
  21#include <scsi/scsi_cmnd.h>
  22#include <scsi/scsi_eh.h>
  23#include <scsi/scsi_tcq.h>
  24#include <scsi/scsi_transport.h>
  25#include <scsi/scsi_transport_spi.h>
  26
  27#define SPI_NUM_ATTRS 14	/* increase this if you add attributes */
  28#define SPI_OTHER_ATTRS 1	/* Increase this if you add "always
  29				 * on" attributes */
  30#define SPI_HOST_ATTRS	1
  31
  32#define SPI_MAX_ECHO_BUFFER_SIZE	4096
  33
  34#define DV_LOOPS	3
  35#define DV_TIMEOUT	(10*HZ)
  36#define DV_RETRIES	3	/* should only need at most 
  37				 * two cc/ua clears */
  38
  39/* Our blacklist flags */
  40enum {
  41	SPI_BLIST_NOIUS = (__force blist_flags_t)0x1,
  42};
  43
  44/* blacklist table, modelled on scsi_devinfo.c */
  45static struct {
  46	char *vendor;
  47	char *model;
  48	blist_flags_t flags;
  49} spi_static_device_list[] __initdata = {
  50	{"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
  51	{"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
  52	{NULL, NULL, 0}
  53};
  54
  55/* Private data accessors (keep these out of the header file) */
  56#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  57#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  58
  59struct spi_internal {
  60	struct scsi_transport_template t;
  61	struct spi_function_template *f;
  62};
  63
  64#define to_spi_internal(tmpl)	container_of(tmpl, struct spi_internal, t)
  65
  66static const int ppr_to_ps[] = {
  67	/* The PPR values 0-6 are reserved, fill them in when
  68	 * the committee defines them */
  69	-1,			/* 0x00 */
  70	-1,			/* 0x01 */
  71	-1,			/* 0x02 */
  72	-1,			/* 0x03 */
  73	-1,			/* 0x04 */
  74	-1,			/* 0x05 */
  75	-1,			/* 0x06 */
  76	 3125,			/* 0x07 */
  77	 6250,			/* 0x08 */
  78	12500,			/* 0x09 */
  79	25000,			/* 0x0a */
  80	30300,			/* 0x0b */
  81	50000,			/* 0x0c */
  82};
  83/* The PPR values at which you calculate the period in ns by multiplying
  84 * by 4 */
  85#define SPI_STATIC_PPR	0x0c
  86
  87static int sprint_frac(char *dest, int value, int denom)
  88{
  89	int frac = value % denom;
  90	int result = sprintf(dest, "%d", value / denom);
  91
  92	if (frac == 0)
  93		return result;
  94	dest[result++] = '.';
  95
  96	do {
  97		denom /= 10;
  98		sprintf(dest + result, "%d", frac / denom);
  99		result++;
 100		frac %= denom;
 101	} while (frac);
 102
 103	dest[result++] = '\0';
 104	return result;
 105}
 106
 107static int spi_execute(struct scsi_device *sdev, const void *cmd,
 108		       enum dma_data_direction dir,
 109		       void *buffer, unsigned bufflen,
 110		       struct scsi_sense_hdr *sshdr)
 111{
 112	int i, result;
 113	unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 114	struct scsi_sense_hdr sshdr_tmp;
 115
 116	if (!sshdr)
 117		sshdr = &sshdr_tmp;
 118
 119	for(i = 0; i < DV_RETRIES; i++) {
 120		result = scsi_execute(sdev, cmd, dir, buffer, bufflen, sense,
 121				      sshdr, DV_TIMEOUT, /* retries */ 1,
 122				      REQ_FAILFAST_DEV |
 123				      REQ_FAILFAST_TRANSPORT |
 124				      REQ_FAILFAST_DRIVER,
 125				      0, NULL);
 126		if (driver_byte(result) != DRIVER_SENSE ||
 127		    sshdr->sense_key != UNIT_ATTENTION)
 128			break;
 129	}
 130	return result;
 131}
 132
 133static struct {
 134	enum spi_signal_type	value;
 135	char			*name;
 136} signal_types[] = {
 137	{ SPI_SIGNAL_UNKNOWN, "unknown" },
 138	{ SPI_SIGNAL_SE, "SE" },
 139	{ SPI_SIGNAL_LVD, "LVD" },
 140	{ SPI_SIGNAL_HVD, "HVD" },
 141};
 142
 143static inline const char *spi_signal_to_string(enum spi_signal_type type)
 144{
 145	int i;
 146
 147	for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 148		if (type == signal_types[i].value)
 149			return signal_types[i].name;
 150	}
 151	return NULL;
 152}
 153static inline enum spi_signal_type spi_signal_to_value(const char *name)
 154{
 155	int i, len;
 156
 157	for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 158		len =  strlen(signal_types[i].name);
 159		if (strncmp(name, signal_types[i].name, len) == 0 &&
 160		    (name[len] == '\n' || name[len] == '\0'))
 161			return signal_types[i].value;
 162	}
 163	return SPI_SIGNAL_UNKNOWN;
 164}
 165
 166static int spi_host_setup(struct transport_container *tc, struct device *dev,
 167			  struct device *cdev)
 168{
 169	struct Scsi_Host *shost = dev_to_shost(dev);
 170
 171	spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 172
 173	return 0;
 174}
 175
 176static int spi_host_configure(struct transport_container *tc,
 177			      struct device *dev,
 178			      struct device *cdev);
 179
 180static DECLARE_TRANSPORT_CLASS(spi_host_class,
 181			       "spi_host",
 182			       spi_host_setup,
 183			       NULL,
 184			       spi_host_configure);
 185
 186static int spi_host_match(struct attribute_container *cont,
 187			  struct device *dev)
 188{
 189	struct Scsi_Host *shost;
 190
 191	if (!scsi_is_host_device(dev))
 192		return 0;
 193
 194	shost = dev_to_shost(dev);
 195	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 196	    != &spi_host_class.class)
 197		return 0;
 198
 199	return &shost->transportt->host_attrs.ac == cont;
 200}
 201
 202static int spi_target_configure(struct transport_container *tc,
 203				struct device *dev,
 204				struct device *cdev);
 205
 206static int spi_device_configure(struct transport_container *tc,
 207				struct device *dev,
 208				struct device *cdev)
 209{
 210	struct scsi_device *sdev = to_scsi_device(dev);
 211	struct scsi_target *starget = sdev->sdev_target;
 212	blist_flags_t bflags;
 213
 214	bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
 215					     &sdev->inquiry[16],
 216					     SCSI_DEVINFO_SPI);
 217
 218	/* Populate the target capability fields with the values
 219	 * gleaned from the device inquiry */
 220
 221	spi_support_sync(starget) = scsi_device_sync(sdev);
 222	spi_support_wide(starget) = scsi_device_wide(sdev);
 223	spi_support_dt(starget) = scsi_device_dt(sdev);
 224	spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 225	spi_support_ius(starget) = scsi_device_ius(sdev);
 226	if (bflags & SPI_BLIST_NOIUS) {
 227		dev_info(dev, "Information Units disabled by blacklist\n");
 228		spi_support_ius(starget) = 0;
 229	}
 230	spi_support_qas(starget) = scsi_device_qas(sdev);
 231
 232	return 0;
 233}
 234
 235static int spi_setup_transport_attrs(struct transport_container *tc,
 236				     struct device *dev,
 237				     struct device *cdev)
 238{
 239	struct scsi_target *starget = to_scsi_target(dev);
 240
 241	spi_period(starget) = -1;	/* illegal value */
 242	spi_min_period(starget) = 0;
 243	spi_offset(starget) = 0;	/* async */
 244	spi_max_offset(starget) = 255;
 245	spi_width(starget) = 0;	/* narrow */
 246	spi_max_width(starget) = 1;
 247	spi_iu(starget) = 0;	/* no IU */
 248	spi_max_iu(starget) = 1;
 249	spi_dt(starget) = 0;	/* ST */
 250	spi_qas(starget) = 0;
 251	spi_max_qas(starget) = 1;
 252	spi_wr_flow(starget) = 0;
 253	spi_rd_strm(starget) = 0;
 254	spi_rti(starget) = 0;
 255	spi_pcomp_en(starget) = 0;
 256	spi_hold_mcs(starget) = 0;
 257	spi_dv_pending(starget) = 0;
 258	spi_dv_in_progress(starget) = 0;
 259	spi_initial_dv(starget) = 0;
 260	mutex_init(&spi_dv_mutex(starget));
 261
 262	return 0;
 263}
 264
 265#define spi_transport_show_simple(field, format_string)			\
 266									\
 267static ssize_t								\
 268show_spi_transport_##field(struct device *dev, 			\
 269			   struct device_attribute *attr, char *buf)	\
 270{									\
 271	struct scsi_target *starget = transport_class_to_starget(dev);	\
 272	struct spi_transport_attrs *tp;					\
 273									\
 274	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 275	return snprintf(buf, 20, format_string, tp->field);		\
 276}
 277
 278#define spi_transport_store_simple(field, format_string)		\
 279									\
 280static ssize_t								\
 281store_spi_transport_##field(struct device *dev, 			\
 282			    struct device_attribute *attr, 		\
 283			    const char *buf, size_t count)		\
 284{									\
 285	int val;							\
 286	struct scsi_target *starget = transport_class_to_starget(dev);	\
 287	struct spi_transport_attrs *tp;					\
 288									\
 289	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 290	val = simple_strtoul(buf, NULL, 0);				\
 291	tp->field = val;						\
 292	return count;							\
 293}
 294
 295#define spi_transport_show_function(field, format_string)		\
 296									\
 297static ssize_t								\
 298show_spi_transport_##field(struct device *dev, 			\
 299			   struct device_attribute *attr, char *buf)	\
 300{									\
 301	struct scsi_target *starget = transport_class_to_starget(dev);	\
 302	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 303	struct spi_transport_attrs *tp;					\
 304	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 305	tp = (struct spi_transport_attrs *)&starget->starget_data;	\
 306	if (i->f->get_##field)						\
 307		i->f->get_##field(starget);				\
 308	return snprintf(buf, 20, format_string, tp->field);		\
 309}
 310
 311#define spi_transport_store_function(field, format_string)		\
 312static ssize_t								\
 313store_spi_transport_##field(struct device *dev, 			\
 314			    struct device_attribute *attr,		\
 315			    const char *buf, size_t count)		\
 316{									\
 317	int val;							\
 318	struct scsi_target *starget = transport_class_to_starget(dev);	\
 319	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 320	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 321									\
 322	if (!i->f->set_##field)						\
 323		return -EINVAL;						\
 324	val = simple_strtoul(buf, NULL, 0);				\
 325	i->f->set_##field(starget, val);				\
 326	return count;							\
 327}
 328
 329#define spi_transport_store_max(field, format_string)			\
 330static ssize_t								\
 331store_spi_transport_##field(struct device *dev, 			\
 332			    struct device_attribute *attr,		\
 333			    const char *buf, size_t count)		\
 334{									\
 335	int val;							\
 336	struct scsi_target *starget = transport_class_to_starget(dev);	\
 337	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 338	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 339	struct spi_transport_attrs *tp					\
 340		= (struct spi_transport_attrs *)&starget->starget_data;	\
 341									\
 342	if (i->f->set_##field)						\
 343		return -EINVAL;						\
 344	val = simple_strtoul(buf, NULL, 0);				\
 345	if (val > tp->max_##field)					\
 346		val = tp->max_##field;					\
 347	i->f->set_##field(starget, val);				\
 348	return count;							\
 349}
 350
 351#define spi_transport_rd_attr(field, format_string)			\
 352	spi_transport_show_function(field, format_string)		\
 353	spi_transport_store_function(field, format_string)		\
 354static DEVICE_ATTR(field, S_IRUGO,				\
 355		   show_spi_transport_##field,			\
 356		   store_spi_transport_##field);
 357
 358#define spi_transport_simple_attr(field, format_string)			\
 359	spi_transport_show_simple(field, format_string)			\
 360	spi_transport_store_simple(field, format_string)		\
 361static DEVICE_ATTR(field, S_IRUGO,				\
 362		   show_spi_transport_##field,			\
 363		   store_spi_transport_##field);
 364
 365#define spi_transport_max_attr(field, format_string)			\
 366	spi_transport_show_function(field, format_string)		\
 367	spi_transport_store_max(field, format_string)			\
 368	spi_transport_simple_attr(max_##field, format_string)		\
 369static DEVICE_ATTR(field, S_IRUGO,				\
 370		   show_spi_transport_##field,			\
 371		   store_spi_transport_##field);
 372
 373/* The Parallel SCSI Tranport Attributes: */
 374spi_transport_max_attr(offset, "%d\n");
 375spi_transport_max_attr(width, "%d\n");
 376spi_transport_max_attr(iu, "%d\n");
 377spi_transport_rd_attr(dt, "%d\n");
 378spi_transport_max_attr(qas, "%d\n");
 379spi_transport_rd_attr(wr_flow, "%d\n");
 380spi_transport_rd_attr(rd_strm, "%d\n");
 381spi_transport_rd_attr(rti, "%d\n");
 382spi_transport_rd_attr(pcomp_en, "%d\n");
 383spi_transport_rd_attr(hold_mcs, "%d\n");
 384
 385/* we only care about the first child device that's a real SCSI device
 386 * so we return 1 to terminate the iteration when we find it */
 387static int child_iter(struct device *dev, void *data)
 388{
 389	if (!scsi_is_sdev_device(dev))
 390		return 0;
 391
 392	spi_dv_device(to_scsi_device(dev));
 393	return 1;
 394}
 395
 396static ssize_t
 397store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 398		     const char *buf, size_t count)
 399{
 400	struct scsi_target *starget = transport_class_to_starget(dev);
 401
 402	device_for_each_child(&starget->dev, NULL, child_iter);
 403	return count;
 404}
 405static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 406
 407/* Translate the period into ns according to the current spec
 408 * for SDTR/PPR messages */
 409static int period_to_str(char *buf, int period)
 410{
 411	int len, picosec;
 412
 413	if (period < 0 || period > 0xff) {
 414		picosec = -1;
 415	} else if (period <= SPI_STATIC_PPR) {
 416		picosec = ppr_to_ps[period];
 417	} else {
 418		picosec = period * 4000;
 419	}
 420
 421	if (picosec == -1) {
 422		len = sprintf(buf, "reserved");
 423	} else {
 424		len = sprint_frac(buf, picosec, 1000);
 425	}
 426
 427	return len;
 428}
 429
 430static ssize_t
 431show_spi_transport_period_helper(char *buf, int period)
 432{
 433	int len = period_to_str(buf, period);
 434	buf[len++] = '\n';
 435	buf[len] = '\0';
 436	return len;
 437}
 438
 439static ssize_t
 440store_spi_transport_period_helper(struct device *dev, const char *buf,
 441				  size_t count, int *periodp)
 442{
 443	int j, picosec, period = -1;
 444	char *endp;
 445
 446	picosec = simple_strtoul(buf, &endp, 10) * 1000;
 447	if (*endp == '.') {
 448		int mult = 100;
 449		do {
 450			endp++;
 451			if (!isdigit(*endp))
 452				break;
 453			picosec += (*endp - '0') * mult;
 454			mult /= 10;
 455		} while (mult > 0);
 456	}
 457
 458	for (j = 0; j <= SPI_STATIC_PPR; j++) {
 459		if (ppr_to_ps[j] < picosec)
 460			continue;
 461		period = j;
 462		break;
 463	}
 464
 465	if (period == -1)
 466		period = picosec / 4000;
 467
 468	if (period > 0xff)
 469		period = 0xff;
 470
 471	*periodp = period;
 472
 473	return count;
 474}
 475
 476static ssize_t
 477show_spi_transport_period(struct device *dev,
 478			  struct device_attribute *attr, char *buf)
 479{
 480	struct scsi_target *starget = transport_class_to_starget(dev);
 481	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 482	struct spi_internal *i = to_spi_internal(shost->transportt);
 483	struct spi_transport_attrs *tp =
 484		(struct spi_transport_attrs *)&starget->starget_data;
 485
 486	if (i->f->get_period)
 487		i->f->get_period(starget);
 488
 489	return show_spi_transport_period_helper(buf, tp->period);
 490}
 491
 492static ssize_t
 493store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 494			   const char *buf, size_t count)
 495{
 496	struct scsi_target *starget = transport_class_to_starget(cdev);
 497	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 498	struct spi_internal *i = to_spi_internal(shost->transportt);
 499	struct spi_transport_attrs *tp =
 500		(struct spi_transport_attrs *)&starget->starget_data;
 501	int period, retval;
 502
 503	if (!i->f->set_period)
 504		return -EINVAL;
 505
 506	retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 507
 508	if (period < tp->min_period)
 509		period = tp->min_period;
 510
 511	i->f->set_period(starget, period);
 512
 513	return retval;
 514}
 515
 516static DEVICE_ATTR(period, S_IRUGO,
 517		   show_spi_transport_period,
 518		   store_spi_transport_period);
 519
 520static ssize_t
 521show_spi_transport_min_period(struct device *cdev,
 522			      struct device_attribute *attr, char *buf)
 523{
 524	struct scsi_target *starget = transport_class_to_starget(cdev);
 525	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 526	struct spi_internal *i = to_spi_internal(shost->transportt);
 527	struct spi_transport_attrs *tp =
 528		(struct spi_transport_attrs *)&starget->starget_data;
 529
 530	if (!i->f->set_period)
 531		return -EINVAL;
 532
 533	return show_spi_transport_period_helper(buf, tp->min_period);
 534}
 535
 536static ssize_t
 537store_spi_transport_min_period(struct device *cdev,
 538			       struct device_attribute *attr,
 539			       const char *buf, size_t count)
 540{
 541	struct scsi_target *starget = transport_class_to_starget(cdev);
 542	struct spi_transport_attrs *tp =
 543		(struct spi_transport_attrs *)&starget->starget_data;
 544
 545	return store_spi_transport_period_helper(cdev, buf, count,
 546						 &tp->min_period);
 547}
 548
 549
 550static DEVICE_ATTR(min_period, S_IRUGO,
 551		   show_spi_transport_min_period,
 552		   store_spi_transport_min_period);
 553
 554
 555static ssize_t show_spi_host_signalling(struct device *cdev,
 556					struct device_attribute *attr,
 557					char *buf)
 558{
 559	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 560	struct spi_internal *i = to_spi_internal(shost->transportt);
 561
 562	if (i->f->get_signalling)
 563		i->f->get_signalling(shost);
 564
 565	return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 566}
 567static ssize_t store_spi_host_signalling(struct device *dev,
 568					 struct device_attribute *attr,
 569					 const char *buf, size_t count)
 570{
 571	struct Scsi_Host *shost = transport_class_to_shost(dev);
 572	struct spi_internal *i = to_spi_internal(shost->transportt);
 573	enum spi_signal_type type = spi_signal_to_value(buf);
 574
 575	if (!i->f->set_signalling)
 576		return -EINVAL;
 577
 578	if (type != SPI_SIGNAL_UNKNOWN)
 579		i->f->set_signalling(shost, type);
 580
 581	return count;
 582}
 583static DEVICE_ATTR(signalling, S_IRUGO,
 584		   show_spi_host_signalling,
 585		   store_spi_host_signalling);
 586
 587static ssize_t show_spi_host_width(struct device *cdev,
 588				      struct device_attribute *attr,
 589				      char *buf)
 590{
 591	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 592
 593	return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow");
 594}
 595static DEVICE_ATTR(host_width, S_IRUGO,
 596		   show_spi_host_width, NULL);
 597
 598static ssize_t show_spi_host_hba_id(struct device *cdev,
 599				    struct device_attribute *attr,
 600				    char *buf)
 601{
 602	struct Scsi_Host *shost = transport_class_to_shost(cdev);
 603
 604	return sprintf(buf, "%d\n", shost->this_id);
 605}
 606static DEVICE_ATTR(hba_id, S_IRUGO,
 607		   show_spi_host_hba_id, NULL);
 608
 609#define DV_SET(x, y)			\
 610	if(i->f->set_##x)		\
 611		i->f->set_##x(sdev->sdev_target, y)
 612
 613enum spi_compare_returns {
 614	SPI_COMPARE_SUCCESS,
 615	SPI_COMPARE_FAILURE,
 616	SPI_COMPARE_SKIP_TEST,
 617};
 618
 619
 620/* This is for read/write Domain Validation:  If the device supports
 621 * an echo buffer, we do read/write tests to it */
 622static enum spi_compare_returns
 623spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 624			  u8 *ptr, const int retries)
 625{
 626	int len = ptr - buffer;
 627	int j, k, r, result;
 628	unsigned int pattern = 0x0000ffff;
 629	struct scsi_sense_hdr sshdr;
 630
 631	const char spi_write_buffer[] = {
 632		WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 633	};
 634	const char spi_read_buffer[] = {
 635		READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 636	};
 637
 638	/* set up the pattern buffer.  Doesn't matter if we spill
 639	 * slightly beyond since that's where the read buffer is */
 640	for (j = 0; j < len; ) {
 641
 642		/* fill the buffer with counting (test a) */
 643		for ( ; j < min(len, 32); j++)
 644			buffer[j] = j;
 645		k = j;
 646		/* fill the buffer with alternating words of 0x0 and
 647		 * 0xffff (test b) */
 648		for ( ; j < min(len, k + 32); j += 2) {
 649			u16 *word = (u16 *)&buffer[j];
 650			
 651			*word = (j & 0x02) ? 0x0000 : 0xffff;
 652		}
 653		k = j;
 654		/* fill with crosstalk (alternating 0x5555 0xaaa)
 655                 * (test c) */
 656		for ( ; j < min(len, k + 32); j += 2) {
 657			u16 *word = (u16 *)&buffer[j];
 658
 659			*word = (j & 0x02) ? 0x5555 : 0xaaaa;
 660		}
 661		k = j;
 662		/* fill with shifting bits (test d) */
 663		for ( ; j < min(len, k + 32); j += 4) {
 664			u32 *word = (unsigned int *)&buffer[j];
 665			u32 roll = (pattern & 0x80000000) ? 1 : 0;
 666			
 667			*word = pattern;
 668			pattern = (pattern << 1) | roll;
 669		}
 670		/* don't bother with random data (test e) */
 671	}
 672
 673	for (r = 0; r < retries; r++) {
 674		result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 675				     buffer, len, &sshdr);
 676		if(result || !scsi_device_online(sdev)) {
 677
 678			scsi_device_set_state(sdev, SDEV_QUIESCE);
 679			if (scsi_sense_valid(&sshdr)
 680			    && sshdr.sense_key == ILLEGAL_REQUEST
 681			    /* INVALID FIELD IN CDB */
 682			    && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 683				/* This would mean that the drive lied
 684				 * to us about supporting an echo
 685				 * buffer (unfortunately some Western
 686				 * Digital drives do precisely this)
 687				 */
 688				return SPI_COMPARE_SKIP_TEST;
 689
 690
 691			sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 692			return SPI_COMPARE_FAILURE;
 693		}
 694
 695		memset(ptr, 0, len);
 696		spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 697			    ptr, len, NULL);
 698		scsi_device_set_state(sdev, SDEV_QUIESCE);
 699
 700		if (memcmp(buffer, ptr, len) != 0)
 701			return SPI_COMPARE_FAILURE;
 702	}
 703	return SPI_COMPARE_SUCCESS;
 704}
 705
 706/* This is for the simplest form of Domain Validation: a read test
 707 * on the inquiry data from the device */
 708static enum spi_compare_returns
 709spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 710			      u8 *ptr, const int retries)
 711{
 712	int r, result;
 713	const int len = sdev->inquiry_len;
 714	const char spi_inquiry[] = {
 715		INQUIRY, 0, 0, 0, len, 0
 716	};
 717
 718	for (r = 0; r < retries; r++) {
 719		memset(ptr, 0, len);
 720
 721		result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 722				     ptr, len, NULL);
 723		
 724		if(result || !scsi_device_online(sdev)) {
 725			scsi_device_set_state(sdev, SDEV_QUIESCE);
 726			return SPI_COMPARE_FAILURE;
 727		}
 728
 729		/* If we don't have the inquiry data already, the
 730		 * first read gets it */
 731		if (ptr == buffer) {
 732			ptr += len;
 733			--r;
 734			continue;
 735		}
 736
 737		if (memcmp(buffer, ptr, len) != 0)
 738			/* failure */
 739			return SPI_COMPARE_FAILURE;
 740	}
 741	return SPI_COMPARE_SUCCESS;
 742}
 743
 744static enum spi_compare_returns
 745spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 746	       enum spi_compare_returns 
 747	       (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 748{
 749	struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 750	struct scsi_target *starget = sdev->sdev_target;
 751	int period = 0, prevperiod = 0; 
 752	enum spi_compare_returns retval;
 753
 754
 755	for (;;) {
 756		int newperiod;
 757		retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 758
 759		if (retval == SPI_COMPARE_SUCCESS
 760		    || retval == SPI_COMPARE_SKIP_TEST)
 761			break;
 762
 763		/* OK, retrain, fallback */
 764		if (i->f->get_iu)
 765			i->f->get_iu(starget);
 766		if (i->f->get_qas)
 767			i->f->get_qas(starget);
 768		if (i->f->get_period)
 769			i->f->get_period(sdev->sdev_target);
 770
 771		/* Here's the fallback sequence; first try turning off
 772		 * IU, then QAS (if we can control them), then finally
 773		 * fall down the periods */
 774		if (i->f->set_iu && spi_iu(starget)) {
 775			starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n");
 776			DV_SET(iu, 0);
 777		} else if (i->f->set_qas && spi_qas(starget)) {
 778			starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n");
 779			DV_SET(qas, 0);
 780		} else {
 781			newperiod = spi_period(starget);
 782			period = newperiod > period ? newperiod : period;
 783			if (period < 0x0d)
 784				period++;
 785			else
 786				period += period >> 1;
 787
 788			if (unlikely(period > 0xff || period == prevperiod)) {
 789				/* Total failure; set to async and return */
 790				starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 791				DV_SET(offset, 0);
 792				return SPI_COMPARE_FAILURE;
 793			}
 794			starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 795			DV_SET(period, period);
 796			prevperiod = period;
 797		}
 798	}
 799	return retval;
 800}
 801
 802static int
 803spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 804{
 805	int l, result;
 806
 807	/* first off do a test unit ready.  This can error out 
 808	 * because of reservations or some other reason.  If it
 809	 * fails, the device won't let us write to the echo buffer
 810	 * so just return failure */
 811	
 812	static const char spi_test_unit_ready[] = {
 813		TEST_UNIT_READY, 0, 0, 0, 0, 0
 814	};
 815
 816	static const char spi_read_buffer_descriptor[] = {
 817		READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 818	};
 819
 820	
 821	/* We send a set of three TURs to clear any outstanding 
 822	 * unit attention conditions if they exist (Otherwise the
 823	 * buffer tests won't be happy).  If the TUR still fails
 824	 * (reservation conflict, device not ready, etc) just
 825	 * skip the write tests */
 826	for (l = 0; ; l++) {
 827		result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
 828				     NULL, 0, NULL);
 829
 830		if(result) {
 831			if(l >= 3)
 832				return 0;
 833		} else {
 834			/* TUR succeeded */
 835			break;
 836		}
 837	}
 838
 839	result = spi_execute(sdev, spi_read_buffer_descriptor, 
 840			     DMA_FROM_DEVICE, buffer, 4, NULL);
 841
 842	if (result)
 843		/* Device has no echo buffer */
 844		return 0;
 845
 846	return buffer[3] + ((buffer[2] & 0x1f) << 8);
 847}
 848
 849static void
 850spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 851{
 852	struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 853	struct scsi_target *starget = sdev->sdev_target;
 854	struct Scsi_Host *shost = sdev->host;
 855	int len = sdev->inquiry_len;
 856	int min_period = spi_min_period(starget);
 857	int max_width = spi_max_width(starget);
 858	/* first set us up for narrow async */
 859	DV_SET(offset, 0);
 860	DV_SET(width, 0);
 861
 862	if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 863	    != SPI_COMPARE_SUCCESS) {
 864		starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 865		/* FIXME: should probably offline the device here? */
 866		return;
 867	}
 868
 869	if (!spi_support_wide(starget)) {
 870		spi_max_width(starget) = 0;
 871		max_width = 0;
 872	}
 873
 874	/* test width */
 875	if (i->f->set_width && max_width) {
 876		i->f->set_width(starget, 1);
 877
 878		if (spi_dv_device_compare_inquiry(sdev, buffer,
 879						   buffer + len,
 880						   DV_LOOPS)
 881		    != SPI_COMPARE_SUCCESS) {
 882			starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 883			i->f->set_width(starget, 0);
 884			/* Make sure we don't force wide back on by asking
 885			 * for a transfer period that requires it */
 886			max_width = 0;
 887			if (min_period < 10)
 888				min_period = 10;
 889		}
 890	}
 891
 892	if (!i->f->set_period)
 893		return;
 894
 895	/* device can't handle synchronous */
 896	if (!spi_support_sync(starget) && !spi_support_dt(starget))
 897		return;
 898
 899	/* len == -1 is the signal that we need to ascertain the
 900	 * presence of an echo buffer before trying to use it.  len ==
 901	 * 0 means we don't have an echo buffer */
 902	len = -1;
 903
 904 retry:
 905
 906	/* now set up to the maximum */
 907	DV_SET(offset, spi_max_offset(starget));
 908	DV_SET(period, min_period);
 909
 910	/* try QAS requests; this should be harmless to set if the
 911	 * target supports it */
 912	if (spi_support_qas(starget) && spi_max_qas(starget)) {
 913		DV_SET(qas, 1);
 914	} else {
 915		DV_SET(qas, 0);
 916	}
 917
 918	if (spi_support_ius(starget) && spi_max_iu(starget) &&
 919	    min_period < 9) {
 920		/* This u320 (or u640). Set IU transfers */
 921		DV_SET(iu, 1);
 922		/* Then set the optional parameters */
 923		DV_SET(rd_strm, 1);
 924		DV_SET(wr_flow, 1);
 925		DV_SET(rti, 1);
 926		if (min_period == 8)
 927			DV_SET(pcomp_en, 1);
 928	} else {
 929		DV_SET(iu, 0);
 930	}
 931
 932	/* now that we've done all this, actually check the bus
 933	 * signal type (if known).  Some devices are stupid on
 934	 * a SE bus and still claim they can try LVD only settings */
 935	if (i->f->get_signalling)
 936		i->f->get_signalling(shost);
 937	if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 938	    spi_signalling(shost) == SPI_SIGNAL_HVD ||
 939	    !spi_support_dt(starget)) {
 940		DV_SET(dt, 0);
 941	} else {
 942		DV_SET(dt, 1);
 943	}
 944	/* set width last because it will pull all the other
 945	 * parameters down to required values */
 946	DV_SET(width, max_width);
 947
 948	/* Do the read only INQUIRY tests */
 949	spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 950		       spi_dv_device_compare_inquiry);
 951	/* See if we actually managed to negotiate and sustain DT */
 952	if (i->f->get_dt)
 953		i->f->get_dt(starget);
 954
 955	/* see if the device has an echo buffer.  If it does we can do
 956	 * the SPI pattern write tests.  Because of some broken
 957	 * devices, we *only* try this on a device that has actually
 958	 * negotiated DT */
 959
 960	if (len == -1 && spi_dt(starget))
 961		len = spi_dv_device_get_echo_buffer(sdev, buffer);
 962
 963	if (len <= 0) {
 964		starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 965		return;
 966	}
 967
 968	if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 969		starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 970		len = SPI_MAX_ECHO_BUFFER_SIZE;
 971	}
 972
 973	if (spi_dv_retrain(sdev, buffer, buffer + len,
 974			   spi_dv_device_echo_buffer)
 975	    == SPI_COMPARE_SKIP_TEST) {
 976		/* OK, the stupid drive can't do a write echo buffer
 977		 * test after all, fall back to the read tests */
 978		len = 0;
 979		goto retry;
 980	}
 981}
 982
 983
 984/**	spi_dv_device - Do Domain Validation on the device
 985 *	@sdev:		scsi device to validate
 986 *
 987 *	Performs the domain validation on the given device in the
 988 *	current execution thread.  Since DV operations may sleep,
 989 *	the current thread must have user context.  Also no SCSI
 990 *	related locks that would deadlock I/O issued by the DV may
 991 *	be held.
 992 */
 993void
 994spi_dv_device(struct scsi_device *sdev)
 995{
 996	struct scsi_target *starget = sdev->sdev_target;
 997	u8 *buffer;
 998	const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 999
1000	/*
1001	 * Because this function and the power management code both call
1002	 * scsi_device_quiesce(), it is not safe to perform domain validation
1003	 * while suspend or resume is in progress. Hence the
1004	 * lock/unlock_system_sleep() calls.
1005	 */
1006	lock_system_sleep();
1007
1008	if (unlikely(spi_dv_in_progress(starget)))
1009		goto unlock;
1010
1011	if (unlikely(scsi_device_get(sdev)))
1012		goto unlock;
1013
1014	spi_dv_in_progress(starget) = 1;
1015
1016	buffer = kzalloc(len, GFP_KERNEL);
1017
1018	if (unlikely(!buffer))
1019		goto out_put;
1020
1021	/* We need to verify that the actual device will quiesce; the
1022	 * later target quiesce is just a nice to have */
1023	if (unlikely(scsi_device_quiesce(sdev)))
1024		goto out_free;
1025
1026	scsi_target_quiesce(starget);
1027
1028	spi_dv_pending(starget) = 1;
1029	mutex_lock(&spi_dv_mutex(starget));
1030
1031	starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1032
1033	spi_dv_device_internal(sdev, buffer);
1034
1035	starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1036
1037	mutex_unlock(&spi_dv_mutex(starget));
1038	spi_dv_pending(starget) = 0;
1039
1040	scsi_target_resume(starget);
1041
1042	spi_initial_dv(starget) = 1;
1043
1044 out_free:
1045	kfree(buffer);
1046 out_put:
1047	spi_dv_in_progress(starget) = 0;
1048	scsi_device_put(sdev);
1049unlock:
1050	unlock_system_sleep();
1051}
1052EXPORT_SYMBOL(spi_dv_device);
1053
1054struct work_queue_wrapper {
1055	struct work_struct	work;
1056	struct scsi_device	*sdev;
1057};
1058
1059static void
1060spi_dv_device_work_wrapper(struct work_struct *work)
1061{
1062	struct work_queue_wrapper *wqw =
1063		container_of(work, struct work_queue_wrapper, work);
1064	struct scsi_device *sdev = wqw->sdev;
1065
1066	kfree(wqw);
1067	spi_dv_device(sdev);
1068	spi_dv_pending(sdev->sdev_target) = 0;
1069	scsi_device_put(sdev);
1070}
1071
1072
1073/**
1074 *	spi_schedule_dv_device - schedule domain validation to occur on the device
1075 *	@sdev:	The device to validate
1076 *
1077 *	Identical to spi_dv_device() above, except that the DV will be
1078 *	scheduled to occur in a workqueue later.  All memory allocations
1079 *	are atomic, so may be called from any context including those holding
1080 *	SCSI locks.
1081 */
1082void
1083spi_schedule_dv_device(struct scsi_device *sdev)
1084{
1085	struct work_queue_wrapper *wqw =
1086		kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1087
1088	if (unlikely(!wqw))
1089		return;
1090
1091	if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1092		kfree(wqw);
1093		return;
1094	}
1095	/* Set pending early (dv_device doesn't check it, only sets it) */
1096	spi_dv_pending(sdev->sdev_target) = 1;
1097	if (unlikely(scsi_device_get(sdev))) {
1098		kfree(wqw);
1099		spi_dv_pending(sdev->sdev_target) = 0;
1100		return;
1101	}
1102
1103	INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1104	wqw->sdev = sdev;
1105
1106	schedule_work(&wqw->work);
1107}
1108EXPORT_SYMBOL(spi_schedule_dv_device);
1109
1110/**
1111 * spi_display_xfer_agreement - Print the current target transfer agreement
1112 * @starget: The target for which to display the agreement
1113 *
1114 * Each SPI port is required to maintain a transfer agreement for each
1115 * other port on the bus.  This function prints a one-line summary of
1116 * the current agreement; more detailed information is available in sysfs.
1117 */
1118void spi_display_xfer_agreement(struct scsi_target *starget)
1119{
1120	struct spi_transport_attrs *tp;
1121	tp = (struct spi_transport_attrs *)&starget->starget_data;
1122
1123	if (tp->offset > 0 && tp->period > 0) {
1124		unsigned int picosec, kb100;
1125		char *scsi = "FAST-?";
1126		char tmp[8];
1127
1128		if (tp->period <= SPI_STATIC_PPR) {
1129			picosec = ppr_to_ps[tp->period];
1130			switch (tp->period) {
1131				case  7: scsi = "FAST-320"; break;
1132				case  8: scsi = "FAST-160"; break;
1133				case  9: scsi = "FAST-80"; break;
1134				case 10:
1135				case 11: scsi = "FAST-40"; break;
1136				case 12: scsi = "FAST-20"; break;
1137			}
1138		} else {
1139			picosec = tp->period * 4000;
1140			if (tp->period < 25)
1141				scsi = "FAST-20";
1142			else if (tp->period < 50)
1143				scsi = "FAST-10";
1144			else
1145				scsi = "FAST-5";
1146		}
1147
1148		kb100 = (10000000 + picosec / 2) / picosec;
1149		if (tp->width)
1150			kb100 *= 2;
1151		sprint_frac(tmp, picosec, 1000);
1152
1153		dev_info(&starget->dev,
1154			 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1155			 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1156			 tp->dt ? "DT" : "ST",
1157			 tp->iu ? " IU" : "",
1158			 tp->qas  ? " QAS" : "",
1159			 tp->rd_strm ? " RDSTRM" : "",
1160			 tp->rti ? " RTI" : "",
1161			 tp->wr_flow ? " WRFLOW" : "",
1162			 tp->pcomp_en ? " PCOMP" : "",
1163			 tp->hold_mcs ? " HMCS" : "",
1164			 tmp, tp->offset);
1165	} else {
1166		dev_info(&starget->dev, "%sasynchronous\n",
1167				tp->width ? "wide " : "");
1168	}
1169}
1170EXPORT_SYMBOL(spi_display_xfer_agreement);
1171
1172int spi_populate_width_msg(unsigned char *msg, int width)
1173{
1174	msg[0] = EXTENDED_MESSAGE;
1175	msg[1] = 2;
1176	msg[2] = EXTENDED_WDTR;
1177	msg[3] = width;
1178	return 4;
1179}
1180EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1181
1182int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1183{
1184	msg[0] = EXTENDED_MESSAGE;
1185	msg[1] = 3;
1186	msg[2] = EXTENDED_SDTR;
1187	msg[3] = period;
1188	msg[4] = offset;
1189	return 5;
1190}
1191EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1192
1193int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1194		int width, int options)
1195{
1196	msg[0] = EXTENDED_MESSAGE;
1197	msg[1] = 6;
1198	msg[2] = EXTENDED_PPR;
1199	msg[3] = period;
1200	msg[4] = 0;
1201	msg[5] = offset;
1202	msg[6] = width;
1203	msg[7] = options;
1204	return 8;
1205}
1206EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1207
1208/**
1209 * spi_populate_tag_msg - place a tag message in a buffer
1210 * @msg:	pointer to the area to place the tag
1211 * @cmd:	pointer to the scsi command for the tag
1212 *
1213 * Notes:
1214 *	designed to create the correct type of tag message for the 
1215 *	particular request.  Returns the size of the tag message.
1216 *	May return 0 if TCQ is disabled for this device.
1217 **/
1218int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd)
1219{
1220        if (cmd->flags & SCMD_TAGGED) {
1221		*msg++ = SIMPLE_QUEUE_TAG;
1222        	*msg++ = cmd->request->tag;
1223        	return 2;
1224	}
1225
1226	return 0;
1227}
1228EXPORT_SYMBOL_GPL(spi_populate_tag_msg);
1229
1230#ifdef CONFIG_SCSI_CONSTANTS
1231static const char * const one_byte_msgs[] = {
1232/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1233/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1234/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1235/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1236/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 
1237/* 0x0f */ "Initiate Recovery", "Release Recovery",
1238/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1239/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1240};
1241
1242static const char * const two_byte_msgs[] = {
1243/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1244/* 0x23 */ "Ignore Wide Residue", "ACA"
1245};
1246
1247static const char * const extended_msgs[] = {
1248/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1249/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1250/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1251};
1252
1253static void print_nego(const unsigned char *msg, int per, int off, int width)
1254{
1255	if (per) {
1256		char buf[20];
1257		period_to_str(buf, msg[per]);
1258		printk("period = %s ns ", buf);
1259	}
1260
1261	if (off)
1262		printk("offset = %d ", msg[off]);
1263	if (width)
1264		printk("width = %d ", 8 << msg[width]);
1265}
1266
1267static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1268{
1269	int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1270			msg[msb+3];
1271	printk("%s = %d ", desc, ptr);
1272}
1273
1274int spi_print_msg(const unsigned char *msg)
1275{
1276	int len = 1, i;
1277	if (msg[0] == EXTENDED_MESSAGE) {
1278		len = 2 + msg[1];
1279		if (len == 2)
1280			len += 256;
1281		if (msg[2] < ARRAY_SIZE(extended_msgs))
1282			printk ("%s ", extended_msgs[msg[2]]); 
1283		else 
1284			printk ("Extended Message, reserved code (0x%02x) ",
1285				(int) msg[2]);
1286		switch (msg[2]) {
1287		case EXTENDED_MODIFY_DATA_POINTER:
1288			print_ptr(msg, 3, "pointer");
1289			break;
1290		case EXTENDED_SDTR:
1291			print_nego(msg, 3, 4, 0);
1292			break;
1293		case EXTENDED_WDTR:
1294			print_nego(msg, 0, 0, 3);
1295			break;
1296		case EXTENDED_PPR:
1297			print_nego(msg, 3, 5, 6);
1298			break;
1299		case EXTENDED_MODIFY_BIDI_DATA_PTR:
1300			print_ptr(msg, 3, "out");
1301			print_ptr(msg, 7, "in");
1302			break;
1303		default:
1304		for (i = 2; i < len; ++i) 
1305			printk("%02x ", msg[i]);
1306		}
1307	/* Identify */
1308	} else if (msg[0] & 0x80) {
1309		printk("Identify disconnect %sallowed %s %d ",
1310			(msg[0] & 0x40) ? "" : "not ",
1311			(msg[0] & 0x20) ? "target routine" : "lun",
1312			msg[0] & 0x7);
1313	/* Normal One byte */
1314	} else if (msg[0] < 0x1f) {
1315		if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1316			printk("%s ", one_byte_msgs[msg[0]]);
1317		else
1318			printk("reserved (%02x) ", msg[0]);
1319	} else if (msg[0] == 0x55) {
1320		printk("QAS Request ");
1321	/* Two byte */
1322	} else if (msg[0] <= 0x2f) {
1323		if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1324			printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1325				msg[1]);
1326		else 
1327			printk("reserved two byte (%02x %02x) ", 
1328				msg[0], msg[1]);
1329		len = 2;
1330	} else 
1331		printk("reserved ");
1332	return len;
1333}
1334EXPORT_SYMBOL(spi_print_msg);
1335
1336#else  /* ifndef CONFIG_SCSI_CONSTANTS */
1337
1338int spi_print_msg(const unsigned char *msg)
1339{
1340	int len = 1, i;
1341
1342	if (msg[0] == EXTENDED_MESSAGE) {
1343		len = 2 + msg[1];
1344		if (len == 2)
1345			len += 256;
1346		for (i = 0; i < len; ++i)
1347			printk("%02x ", msg[i]);
1348	/* Identify */
1349	} else if (msg[0] & 0x80) {
1350		printk("%02x ", msg[0]);
1351	/* Normal One byte */
1352	} else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1353		printk("%02x ", msg[0]);
1354	/* Two byte */
1355	} else if (msg[0] <= 0x2f) {
1356		printk("%02x %02x", msg[0], msg[1]);
1357		len = 2;
1358	} else 
1359		printk("%02x ", msg[0]);
1360	return len;
1361}
1362EXPORT_SYMBOL(spi_print_msg);
1363#endif /* ! CONFIG_SCSI_CONSTANTS */
1364
1365static int spi_device_match(struct attribute_container *cont,
1366			    struct device *dev)
1367{
1368	struct scsi_device *sdev;
1369	struct Scsi_Host *shost;
1370	struct spi_internal *i;
1371
1372	if (!scsi_is_sdev_device(dev))
1373		return 0;
1374
1375	sdev = to_scsi_device(dev);
1376	shost = sdev->host;
1377	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1378	    != &spi_host_class.class)
1379		return 0;
1380	/* Note: this class has no device attributes, so it has
1381	 * no per-HBA allocation and thus we don't need to distinguish
1382	 * the attribute containers for the device */
1383	i = to_spi_internal(shost->transportt);
1384	if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1385		return 0;
1386	return 1;
1387}
1388
1389static int spi_target_match(struct attribute_container *cont,
1390			    struct device *dev)
1391{
1392	struct Scsi_Host *shost;
1393	struct scsi_target *starget;
1394	struct spi_internal *i;
1395
1396	if (!scsi_is_target_device(dev))
1397		return 0;
1398
1399	shost = dev_to_shost(dev->parent);
1400	if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1401	    != &spi_host_class.class)
1402		return 0;
1403
1404	i = to_spi_internal(shost->transportt);
1405	starget = to_scsi_target(dev);
1406
1407	if (i->f->deny_binding && i->f->deny_binding(starget))
1408		return 0;
1409
1410	return &i->t.target_attrs.ac == cont;
1411}
1412
1413static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1414			       "spi_transport",
1415			       spi_setup_transport_attrs,
1416			       NULL,
1417			       spi_target_configure);
1418
1419static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1420				    spi_device_match,
1421				    spi_device_configure);
1422
1423static struct attribute *host_attributes[] = {
1424	&dev_attr_signalling.attr,
1425	&dev_attr_host_width.attr,
1426	&dev_attr_hba_id.attr,
1427	NULL
1428};
1429
1430static struct attribute_group host_attribute_group = {
1431	.attrs = host_attributes,
1432};
1433
1434static int spi_host_configure(struct transport_container *tc,
1435			      struct device *dev,
1436			      struct device *cdev)
1437{
1438	struct kobject *kobj = &cdev->kobj;
1439	struct Scsi_Host *shost = transport_class_to_shost(cdev);
1440	struct spi_internal *si = to_spi_internal(shost->transportt);
1441	struct attribute *attr = &dev_attr_signalling.attr;
1442	int rc = 0;
1443
1444	if (si->f->set_signalling)
1445		rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1446
1447	return rc;
1448}
1449
1450/* returns true if we should be showing the variable.  Also
1451 * overloads the return by setting 1<<1 if the attribute should
1452 * be writeable */
1453#define TARGET_ATTRIBUTE_HELPER(name) \
1454	(si->f->show_##name ? S_IRUGO : 0) | \
1455	(si->f->set_##name ? S_IWUSR : 0)
1456
1457static umode_t target_attribute_is_visible(struct kobject *kobj,
1458					  struct attribute *attr, int i)
1459{
1460	struct device *cdev = container_of(kobj, struct device, kobj);
1461	struct scsi_target *starget = transport_class_to_starget(cdev);
1462	struct Scsi_Host *shost = transport_class_to_shost(cdev);
1463	struct spi_internal *si = to_spi_internal(shost->transportt);
1464
1465	if (attr == &dev_attr_period.attr &&
1466	    spi_support_sync(starget))
1467		return TARGET_ATTRIBUTE_HELPER(period);
1468	else if (attr == &dev_attr_min_period.attr &&
1469		 spi_support_sync(starget))
1470		return TARGET_ATTRIBUTE_HELPER(period);
1471	else if (attr == &dev_attr_offset.attr &&
1472		 spi_support_sync(starget))
1473		return TARGET_ATTRIBUTE_HELPER(offset);
1474	else if (attr == &dev_attr_max_offset.attr &&
1475		 spi_support_sync(starget))
1476		return TARGET_ATTRIBUTE_HELPER(offset);
1477	else if (attr == &dev_attr_width.attr &&
1478		 spi_support_wide(starget))
1479		return TARGET_ATTRIBUTE_HELPER(width);
1480	else if (attr == &dev_attr_max_width.attr &&
1481		 spi_support_wide(starget))
1482		return TARGET_ATTRIBUTE_HELPER(width);
1483	else if (attr == &dev_attr_iu.attr &&
1484		 spi_support_ius(starget))
1485		return TARGET_ATTRIBUTE_HELPER(iu);
1486	else if (attr == &dev_attr_max_iu.attr &&
1487		 spi_support_ius(starget))
1488		return TARGET_ATTRIBUTE_HELPER(iu);
1489	else if (attr == &dev_attr_dt.attr &&
1490		 spi_support_dt(starget))
1491		return TARGET_ATTRIBUTE_HELPER(dt);
1492	else if (attr == &dev_attr_qas.attr &&
1493		 spi_support_qas(starget))
1494		return TARGET_ATTRIBUTE_HELPER(qas);
1495	else if (attr == &dev_attr_max_qas.attr &&
1496		 spi_support_qas(starget))
1497		return TARGET_ATTRIBUTE_HELPER(qas);
1498	else if (attr == &dev_attr_wr_flow.attr &&
1499		 spi_support_ius(starget))
1500		return TARGET_ATTRIBUTE_HELPER(wr_flow);
1501	else if (attr == &dev_attr_rd_strm.attr &&
1502		 spi_support_ius(starget))
1503		return TARGET_ATTRIBUTE_HELPER(rd_strm);
1504	else if (attr == &dev_attr_rti.attr &&
1505		 spi_support_ius(starget))
1506		return TARGET_ATTRIBUTE_HELPER(rti);
1507	else if (attr == &dev_attr_pcomp_en.attr &&
1508		 spi_support_ius(starget))
1509		return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1510	else if (attr == &dev_attr_hold_mcs.attr &&
1511		 spi_support_ius(starget))
1512		return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1513	else if (attr == &dev_attr_revalidate.attr)
1514		return S_IWUSR;
1515
1516	return 0;
1517}
1518
1519static struct attribute *target_attributes[] = {
1520	&dev_attr_period.attr,
1521	&dev_attr_min_period.attr,
1522	&dev_attr_offset.attr,
1523	&dev_attr_max_offset.attr,
1524	&dev_attr_width.attr,
1525	&dev_attr_max_width.attr,
1526	&dev_attr_iu.attr,
1527	&dev_attr_max_iu.attr,
1528	&dev_attr_dt.attr,
1529	&dev_attr_qas.attr,
1530	&dev_attr_max_qas.attr,
1531	&dev_attr_wr_flow.attr,
1532	&dev_attr_rd_strm.attr,
1533	&dev_attr_rti.attr,
1534	&dev_attr_pcomp_en.attr,
1535	&dev_attr_hold_mcs.attr,
1536	&dev_attr_revalidate.attr,
1537	NULL
1538};
1539
1540static struct attribute_group target_attribute_group = {
1541	.attrs = target_attributes,
1542	.is_visible = target_attribute_is_visible,
1543};
1544
1545static int spi_target_configure(struct transport_container *tc,
1546				struct device *dev,
1547				struct device *cdev)
1548{
1549	struct kobject *kobj = &cdev->kobj;
1550
1551	/* force an update based on parameters read from the device */
1552	sysfs_update_group(kobj, &target_attribute_group);
1553
1554	return 0;
1555}
1556
1557struct scsi_transport_template *
1558spi_attach_transport(struct spi_function_template *ft)
1559{
1560	struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1561					 GFP_KERNEL);
1562
1563	if (unlikely(!i))
1564		return NULL;
1565
1566	i->t.target_attrs.ac.class = &spi_transport_class.class;
1567	i->t.target_attrs.ac.grp = &target_attribute_group;
1568	i->t.target_attrs.ac.match = spi_target_match;
1569	transport_container_register(&i->t.target_attrs);
1570	i->t.target_size = sizeof(struct spi_transport_attrs);
1571	i->t.host_attrs.ac.class = &spi_host_class.class;
1572	i->t.host_attrs.ac.grp = &host_attribute_group;
1573	i->t.host_attrs.ac.match = spi_host_match;
1574	transport_container_register(&i->t.host_attrs);
1575	i->t.host_size = sizeof(struct spi_host_attrs);
1576	i->f = ft;
1577
1578	return &i->t;
1579}
1580EXPORT_SYMBOL(spi_attach_transport);
1581
1582void spi_release_transport(struct scsi_transport_template *t)
1583{
1584	struct spi_internal *i = to_spi_internal(t);
1585
1586	transport_container_unregister(&i->t.target_attrs);
1587	transport_container_unregister(&i->t.host_attrs);
1588
1589	kfree(i);
1590}
1591EXPORT_SYMBOL(spi_release_transport);
1592
1593static __init int spi_transport_init(void)
1594{
1595	int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1596					   "SCSI Parallel Transport Class");
1597	if (!error) {
1598		int i;
1599
1600		for (i = 0; spi_static_device_list[i].vendor; i++)
1601			scsi_dev_info_list_add_keyed(1,	/* compatible */
1602						     spi_static_device_list[i].vendor,
1603						     spi_static_device_list[i].model,
1604						     NULL,
1605						     spi_static_device_list[i].flags,
1606						     SCSI_DEVINFO_SPI);
1607	}
1608
1609	error = transport_class_register(&spi_transport_class);
1610	if (error)
1611		return error;
1612	error = anon_transport_class_register(&spi_device_class);
1613	return transport_class_register(&spi_host_class);
1614}
1615
1616static void __exit spi_transport_exit(void)
1617{
1618	transport_class_unregister(&spi_transport_class);
1619	anon_transport_class_unregister(&spi_device_class);
1620	transport_class_unregister(&spi_host_class);
1621	scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1622}
1623
1624MODULE_AUTHOR("Martin Hicks");
1625MODULE_DESCRIPTION("SPI Transport Attributes");
1626MODULE_LICENSE("GPL");
1627
1628module_init(spi_transport_init);
1629module_exit(spi_transport_exit);