drivers/scsi/scsi_transport_spi.c

   1 /*
   2  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21 #include <linux/ctype.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/blkdev.h>
  26 #include <linux/mutex.h>
  27 #include <scsi/scsi.h>
  28 #include "scsi_priv.h"
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_cmnd.h>
  32 #include <scsi/scsi_eh.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_spi.h>
  35
  36 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  37 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  38                                  * on" attributes */
  39 #define SPI_HOST_ATTRS  1
  40
  41 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  42
  43 #define DV_LOOPS        3
  44 #define DV_TIMEOUT      (10*HZ)
  45 #define DV_RETRIES      3       /* should only need at most
  46                                  * two cc/ua clears */
  47
  48 /* Private data accessors (keep these out of the header file) */
  49 #define spi_dv_pending(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_pending)
  50 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  51 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  52
  53 struct spi_internal {
  54         struct scsi_transport_template t;
  55         struct spi_function_template *f;
  56         /* The actual attributes */
  57         struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
  58         /* The array of null terminated pointers to attributes
  59          * needed by scsi_sysfs.c */
  60         struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
  61         struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
  62         struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
  63 };
  64
  65 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  66
  67 static const int ppr_to_ps[] = {
  68         /* The PPR values 0-6 are reserved, fill them in when
  69          * the committee defines them */
  70         -1,                     /* 0x00 */
  71         -1,                     /* 0x01 */
  72         -1,                     /* 0x02 */
  73         -1,                     /* 0x03 */
  74         -1,                     /* 0x04 */
  75         -1,                     /* 0x05 */
  76         -1,                     /* 0x06 */
  77          3125,                  /* 0x07 */
  78          6250,                  /* 0x08 */
  79         12500,                  /* 0x09 */
  80         25000,                  /* 0x0a */
  81         30300,                  /* 0x0b */
  82         50000,                  /* 0x0c */
  83 };
  84 /* The PPR values at which you calculate the period in ns by multiplying
  85  * by 4 */
  86 #define SPI_STATIC_PPR  0x0c
  87
  88 static int sprint_frac(char *dest, int value, int denom)
  89 {
  90         int frac = value % denom;
  91         int result = sprintf(dest, "%d", value / denom);
  92
  93         if (frac == 0)
  94                 return result;
  95         dest[result++] = '.';
  96
  97         do {
  98                 denom /= 10;
  99                 sprintf(dest + result, "%d", frac / denom);
 100                 result++;
 101                 frac %= denom;
 102         } while (frac);
 103
 104         dest[result++] = '\0';
 105         return result;
 106 }
 107
 108 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 109                        enum dma_data_direction dir,
 110                        void *buffer, unsigned bufflen,
 111                        struct scsi_sense_hdr *sshdr)
 112 {
 113         int i, result;
 114         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 115
 116         for(i = 0; i < DV_RETRIES; i++) {
 117                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 118                                       sense, DV_TIMEOUT, /* retries */ 1,
 119                                       REQ_FAILFAST);
 120                 if (result & DRIVER_SENSE) {
 121                         struct scsi_sense_hdr sshdr_tmp;
 122                         if (!sshdr)
 123                                 sshdr = &sshdr_tmp;
 124
 125                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 126                                                  sshdr)
 127                             && sshdr->sense_key == UNIT_ATTENTION)
 128                                 continue;
 129                 }
 130                 break;
 131         }
 132         return result;
 133 }
 134
 135 static struct {
 136         enum spi_signal_type    value;
 137         char                    *name;
 138 } signal_types[] = {
 139         { SPI_SIGNAL_UNKNOWN, "unknown" },
 140         { SPI_SIGNAL_SE, "SE" },
 141         { SPI_SIGNAL_LVD, "LVD" },
 142         { SPI_SIGNAL_HVD, "HVD" },
 143 };
 144
 145 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 146 {
 147         int i;
 148
 149         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 150                 if (type == signal_types[i].value)
 151                         return signal_types[i].name;
 152         }
 153         return NULL;
 154 }
 155 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 156 {
 157         int i, len;
 158
 159         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 160                 len =  strlen(signal_types[i].name);
 161                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 162                     (name[len] == '\n' || name[len] == '\0'))
 163                         return signal_types[i].value;
 164         }
 165         return SPI_SIGNAL_UNKNOWN;
 166 }
 167
 168 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 169                           struct class_device *cdev)
 170 {
 171         struct Scsi_Host *shost = dev_to_shost(dev);
 172
 173         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 174
 175         return 0;
 176 }
 177
 178 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 179                                "spi_host",
 180                                spi_host_setup,
 181                                NULL,
 182                                NULL);
 183
 184 static int spi_host_match(struct attribute_container *cont,
 185                           struct device *dev)
 186 {
 187         struct Scsi_Host *shost;
 188         struct spi_internal *i;
 189
 190         if (!scsi_is_host_device(dev))
 191                 return 0;
 192
 193         shost = dev_to_shost(dev);
 194         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 195             != &spi_host_class.class)
 196                 return 0;
 197
 198         i = to_spi_internal(shost->transportt);
 199
 200         return &i->t.host_attrs.ac == cont;
 201 }
 202
 203 static int spi_device_configure(struct transport_container *tc,
 204                                 struct device *dev,
 205                                 struct class_device *cdev)
 206 {
 207         struct scsi_device *sdev = to_scsi_device(dev);
 208         struct scsi_target *starget = sdev->sdev_target;
 209
 210         /* Populate the target capability fields with the values
 211          * gleaned from the device inquiry */
 212
 213         spi_support_sync(starget) = scsi_device_sync(sdev);
 214         spi_support_wide(starget) = scsi_device_wide(sdev);
 215         spi_support_dt(starget) = scsi_device_dt(sdev);
 216         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 217         spi_support_ius(starget) = scsi_device_ius(sdev);
 218         spi_support_qas(starget) = scsi_device_qas(sdev);
 219
 220         return 0;
 221 }
 222
 223 static int spi_setup_transport_attrs(struct transport_container *tc,
 224                                      struct device *dev,
 225                                      struct class_device *cdev)
 226 {
 227         struct scsi_target *starget = to_scsi_target(dev);
 228
 229         spi_period(starget) = -1;       /* illegal value */
 230         spi_min_period(starget) = 0;
 231         spi_offset(starget) = 0;        /* async */
 232         spi_max_offset(starget) = 255;
 233         spi_width(starget) = 0; /* narrow */
 234         spi_max_width(starget) = 1;
 235         spi_iu(starget) = 0;    /* no IU */
 236         spi_dt(starget) = 0;    /* ST */
 237         spi_qas(starget) = 0;
 238         spi_wr_flow(starget) = 0;
 239         spi_rd_strm(starget) = 0;
 240         spi_rti(starget) = 0;
 241         spi_pcomp_en(starget) = 0;
 242         spi_hold_mcs(starget) = 0;
 243         spi_dv_pending(starget) = 0;
 244         spi_dv_in_progress(starget) = 0;
 245         spi_initial_dv(starget) = 0;
 246         mutex_init(&spi_dv_mutex(starget));
 247
 248         return 0;
 249 }
 250
 251 #define spi_transport_show_simple(field, format_string)                 \
 252                                                                         \
 253 static ssize_t                                                          \
 254 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 255 {                                                                       \
 256         struct scsi_target *starget = transport_class_to_starget(cdev); \
 257         struct spi_transport_attrs *tp;                                 \
 258                                                                         \
 259         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 260         return snprintf(buf, 20, format_string, tp->field);             \
 261 }
 262
 263 #define spi_transport_store_simple(field, format_string)                \
 264                                                                         \
 265 static ssize_t                                                          \
 266 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 267                             size_t count)                               \
 268 {                                                                       \
 269         int val;                                                        \
 270         struct scsi_target *starget = transport_class_to_starget(cdev); \
 271         struct spi_transport_attrs *tp;                                 \
 272                                                                         \
 273         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 274         val = simple_strtoul(buf, NULL, 0);                             \
 275         tp->field = val;                                                \
 276         return count;                                                   \
 277 }
 278
 279 #define spi_transport_show_function(field, format_string)               \
 280                                                                         \
 281 static ssize_t                                                          \
 282 show_spi_transport_##field(struct class_device *cdev, char *buf)        \
 283 {                                                                       \
 284         struct scsi_target *starget = transport_class_to_starget(cdev); \
 285         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 286         struct spi_transport_attrs *tp;                                 \
 287         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 288         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 289         if (i->f->get_##field)                                          \
 290                 i->f->get_##field(starget);                             \
 291         return snprintf(buf, 20, format_string, tp->field);             \
 292 }
 293
 294 #define spi_transport_store_function(field, format_string)              \
 295 static ssize_t                                                          \
 296 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 297                             size_t count)                               \
 298 {                                                                       \
 299         int val;                                                        \
 300         struct scsi_target *starget = transport_class_to_starget(cdev); \
 301         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 302         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 303                                                                         \
 304         val = simple_strtoul(buf, NULL, 0);                             \
 305         i->f->set_##field(starget, val);                        \
 306         return count;                                                   \
 307 }
 308
 309 #define spi_transport_store_max(field, format_string)                   \
 310 static ssize_t                                                          \
 311 store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 312                             size_t count)                               \
 313 {                                                                       \
 314         int val;                                                        \
 315         struct scsi_target *starget = transport_class_to_starget(cdev); \
 316         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 317         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 318         struct spi_transport_attrs *tp                                  \
 319                 = (struct spi_transport_attrs *)&starget->starget_data; \
 320                                                                         \
 321         val = simple_strtoul(buf, NULL, 0);                             \
 322         if (val > tp->max_##field)                                      \
 323                 val = tp->max_##field;                                  \
 324         i->f->set_##field(starget, val);                                \
 325         return count;                                                   \
 326 }
 327
 328 #define spi_transport_rd_attr(field, format_string)                     \
 329         spi_transport_show_function(field, format_string)               \
 330         spi_transport_store_function(field, format_string)              \
 331 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 332                          show_spi_transport_##field,                    \
 333                          store_spi_transport_##field);
 334
 335 #define spi_transport_simple_attr(field, format_string)                 \
 336         spi_transport_show_simple(field, format_string)                 \
 337         spi_transport_store_simple(field, format_string)                \
 338 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 339                          show_spi_transport_##field,                    \
 340                          store_spi_transport_##field);
 341
 342 #define spi_transport_max_attr(field, format_string)                    \
 343         spi_transport_show_function(field, format_string)               \
 344         spi_transport_store_max(field, format_string)                   \
 345         spi_transport_simple_attr(max_##field, format_string)           \
 346 static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,                      \
 347                          show_spi_transport_##field,                    \
 348                          store_spi_transport_##field);
 349
 350 /* The Parallel SCSI Tranport Attributes: */
 351 spi_transport_max_attr(offset, "%d\n");
 352 spi_transport_max_attr(width, "%d\n");
 353 spi_transport_rd_attr(iu, "%d\n");
 354 spi_transport_rd_attr(dt, "%d\n");
 355 spi_transport_rd_attr(qas, "%d\n");
 356 spi_transport_rd_attr(wr_flow, "%d\n");
 357 spi_transport_rd_attr(rd_strm, "%d\n");
 358 spi_transport_rd_attr(rti, "%d\n");
 359 spi_transport_rd_attr(pcomp_en, "%d\n");
 360 spi_transport_rd_attr(hold_mcs, "%d\n");
 361
 362 /* we only care about the first child device so we return 1 */
 363 static int child_iter(struct device *dev, void *data)
 364 {
 365         struct scsi_device *sdev = to_scsi_device(dev);
 366
 367         spi_dv_device(sdev);
 368         return 1;
 369 }
 370
 371 static ssize_t
 372 store_spi_revalidate(struct class_device *cdev, const char *buf, size_t count)
 373 {
 374         struct scsi_target *starget = transport_class_to_starget(cdev);
 375
 376         device_for_each_child(&starget->dev, NULL, child_iter);
 377         return count;
 378 }
 379 static CLASS_DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 380
 381 /* Translate the period into ns according to the current spec
 382  * for SDTR/PPR messages */
 383 static int period_to_str(char *buf, int period)
 384 {
 385         int len, picosec;
 386
 387         if (period < 0 || period > 0xff) {
 388                 picosec = -1;
 389         } else if (period <= SPI_STATIC_PPR) {
 390                 picosec = ppr_to_ps[period];
 391         } else {
 392                 picosec = period * 4000;
 393         }
 394
 395         if (picosec == -1) {
 396                 len = sprintf(buf, "reserved");
 397         } else {
 398                 len = sprint_frac(buf, picosec, 1000);
 399         }
 400
 401         return len;
 402 }
 403
 404 static ssize_t
 405 show_spi_transport_period_helper(char *buf, int period)
 406 {
 407         int len = period_to_str(buf, period);
 408         buf[len++] = '\n';
 409         buf[len] = '\0';
 410         return len;
 411 }
 412
 413 static ssize_t
 414 store_spi_transport_period_helper(struct class_device *cdev, const char *buf,
 415                                   size_t count, int *periodp)
 416 {
 417         int j, picosec, period = -1;
 418         char *endp;
 419
 420         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 421         if (*endp == '.') {
 422                 int mult = 100;
 423                 do {
 424                         endp++;
 425                         if (!isdigit(*endp))
 426                                 break;
 427                         picosec += (*endp - '0') * mult;
 428                         mult /= 10;
 429                 } while (mult > 0);
 430         }
 431
 432         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 433                 if (ppr_to_ps[j] < picosec)
 434                         continue;
 435                 period = j;
 436                 break;
 437         }
 438
 439         if (period == -1)
 440                 period = picosec / 4000;
 441
 442         if (period > 0xff)
 443                 period = 0xff;
 444
 445         *periodp = period;
 446
 447         return count;
 448 }
 449
 450 static ssize_t
 451 show_spi_transport_period(struct class_device *cdev, char *buf)
 452 {
 453         struct scsi_target *starget = transport_class_to_starget(cdev);
 454         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 455         struct spi_internal *i = to_spi_internal(shost->transportt);
 456         struct spi_transport_attrs *tp =
 457                 (struct spi_transport_attrs *)&starget->starget_data;
 458
 459         if (i->f->get_period)
 460                 i->f->get_period(starget);
 461
 462         return show_spi_transport_period_helper(buf, tp->period);
 463 }
 464
 465 static ssize_t
 466 store_spi_transport_period(struct class_device *cdev, const char *buf,
 467                             size_t count)
 468 {
 469         struct scsi_target *starget = transport_class_to_starget(cdev);
 470         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 471         struct spi_internal *i = to_spi_internal(shost->transportt);
 472         struct spi_transport_attrs *tp =
 473                 (struct spi_transport_attrs *)&starget->starget_data;
 474         int period, retval;
 475
 476         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 477
 478         if (period < tp->min_period)
 479                 period = tp->min_period;
 480
 481         i->f->set_period(starget, period);
 482
 483         return retval;
 484 }
 485
 486 static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR,
 487                          show_spi_transport_period,
 488                          store_spi_transport_period);
 489
 490 static ssize_t
 491 show_spi_transport_min_period(struct class_device *cdev, char *buf)
 492 {
 493         struct scsi_target *starget = transport_class_to_starget(cdev);
 494         struct spi_transport_attrs *tp =
 495                 (struct spi_transport_attrs *)&starget->starget_data;
 496
 497         return show_spi_transport_period_helper(buf, tp->min_period);
 498 }
 499
 500 static ssize_t
 501 store_spi_transport_min_period(struct class_device *cdev, const char *buf,
 502                             size_t count)
 503 {
 504         struct scsi_target *starget = transport_class_to_starget(cdev);
 505         struct spi_transport_attrs *tp =
 506                 (struct spi_transport_attrs *)&starget->starget_data;
 507
 508         return store_spi_transport_period_helper(cdev, buf, count,
 509                                                  &tp->min_period);
 510 }
 511
 512
 513 static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR,
 514                          show_spi_transport_min_period,
 515                          store_spi_transport_min_period);
 516
 517
 518 static ssize_t show_spi_host_signalling(struct class_device *cdev, char *buf)
 519 {
 520         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 521         struct spi_internal *i = to_spi_internal(shost->transportt);
 522
 523         if (i->f->get_signalling)
 524                 i->f->get_signalling(shost);
 525
 526         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 527 }
 528 static ssize_t store_spi_host_signalling(struct class_device *cdev,
 529                                          const char *buf, size_t count)
 530 {
 531         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 532         struct spi_internal *i = to_spi_internal(shost->transportt);
 533         enum spi_signal_type type = spi_signal_to_value(buf);
 534
 535         if (type != SPI_SIGNAL_UNKNOWN)
 536                 i->f->set_signalling(shost, type);
 537
 538         return count;
 539 }
 540 static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
 541                          show_spi_host_signalling,
 542                          store_spi_host_signalling);
 543
 544 #define DV_SET(x, y)                    \
 545         if(i->f->set_##x)               \
 546                 i->f->set_##x(sdev->sdev_target, y)
 547
 548 enum spi_compare_returns {
 549         SPI_COMPARE_SUCCESS,
 550         SPI_COMPARE_FAILURE,
 551         SPI_COMPARE_SKIP_TEST,
 552 };
 553
 554
 555 /* This is for read/write Domain Validation:  If the device supports
 556  * an echo buffer, we do read/write tests to it */
 557 static enum spi_compare_returns
 558 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 559                           u8 *ptr, const int retries)
 560 {
 561         int len = ptr - buffer;
 562         int j, k, r, result;
 563         unsigned int pattern = 0x0000ffff;
 564         struct scsi_sense_hdr sshdr;
 565
 566         const char spi_write_buffer[] = {
 567                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 568         };
 569         const char spi_read_buffer[] = {
 570                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 571         };
 572
 573         /* set up the pattern buffer.  Doesn't matter if we spill
 574          * slightly beyond since that's where the read buffer is */
 575         for (j = 0; j < len; ) {
 576
 577                 /* fill the buffer with counting (test a) */
 578                 for ( ; j < min(len, 32); j++)
 579                         buffer[j] = j;
 580                 k = j;
 581                 /* fill the buffer with alternating words of 0x0 and
 582                  * 0xffff (test b) */
 583                 for ( ; j < min(len, k + 32); j += 2) {
 584                         u16 *word = (u16 *)&buffer[j];
 585
 586                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 587                 }
 588                 k = j;
 589                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 590                  * (test c) */
 591                 for ( ; j < min(len, k + 32); j += 2) {
 592                         u16 *word = (u16 *)&buffer[j];
 593
 594                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 595                 }
 596                 k = j;
 597                 /* fill with shifting bits (test d) */
 598                 for ( ; j < min(len, k + 32); j += 4) {
 599                         u32 *word = (unsigned int *)&buffer[j];
 600                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 601
 602                         *word = pattern;
 603                         pattern = (pattern << 1) | roll;
 604                 }
 605                 /* don't bother with random data (test e) */
 606         }
 607
 608         for (r = 0; r < retries; r++) {
 609                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 610                                      buffer, len, &sshdr);
 611                 if(result || !scsi_device_online(sdev)) {
 612
 613                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 614                         if (scsi_sense_valid(&sshdr)
 615                             && sshdr.sense_key == ILLEGAL_REQUEST
 616                             /* INVALID FIELD IN CDB */
 617                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 618                                 /* This would mean that the drive lied
 619                                  * to us about supporting an echo
 620                                  * buffer (unfortunately some Western
 621                                  * Digital drives do precisely this)
 622                                  */
 623                                 return SPI_COMPARE_SKIP_TEST;
 624
 625
 626                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 627                         return SPI_COMPARE_FAILURE;
 628                 }
 629
 630                 memset(ptr, 0, len);
 631                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 632                             ptr, len, NULL);
 633                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 634
 635                 if (memcmp(buffer, ptr, len) != 0)
 636                         return SPI_COMPARE_FAILURE;
 637         }
 638         return SPI_COMPARE_SUCCESS;
 639 }
 640
 641 /* This is for the simplest form of Domain Validation: a read test
 642  * on the inquiry data from the device */
 643 static enum spi_compare_returns
 644 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 645                               u8 *ptr, const int retries)
 646 {
 647         int r, result;
 648         const int len = sdev->inquiry_len;
 649         const char spi_inquiry[] = {
 650                 INQUIRY, 0, 0, 0, len, 0
 651         };
 652
 653         for (r = 0; r < retries; r++) {
 654                 memset(ptr, 0, len);
 655
 656                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 657                                      ptr, len, NULL);
 658
 659                 if(result || !scsi_device_online(sdev)) {
 660                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 661                         return SPI_COMPARE_FAILURE;
 662                 }
 663
 664                 /* If we don't have the inquiry data already, the
 665                  * first read gets it */
 666                 if (ptr == buffer) {
 667                         ptr += len;
 668                         --r;
 669                         continue;
 670                 }
 671
 672                 if (memcmp(buffer, ptr, len) != 0)
 673                         /* failure */
 674                         return SPI_COMPARE_FAILURE;
 675         }
 676         return SPI_COMPARE_SUCCESS;
 677 }
 678
 679 static enum spi_compare_returns
 680 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 681                enum spi_compare_returns
 682                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 683 {
 684         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 685         struct scsi_target *starget = sdev->sdev_target;
 686         int period = 0, prevperiod = 0;
 687         enum spi_compare_returns retval;
 688
 689
 690         for (;;) {
 691                 int newperiod;
 692                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 693
 694                 if (retval == SPI_COMPARE_SUCCESS
 695                     || retval == SPI_COMPARE_SKIP_TEST)
 696                         break;
 697
 698                 /* OK, retrain, fallback */
 699                 if (i->f->get_iu)
 700                         i->f->get_iu(starget);
 701                 if (i->f->get_qas)
 702                         i->f->get_qas(starget);
 703                 if (i->f->get_period)
 704                         i->f->get_period(sdev->sdev_target);
 705
 706                 /* Here's the fallback sequence; first try turning off
 707                  * IU, then QAS (if we can control them), then finally
 708                  * fall down the periods */
 709                 if (i->f->set_iu && spi_iu(starget)) {
 710                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 711                         DV_SET(iu, 0);
 712                 } else if (i->f->set_qas && spi_qas(starget)) {
 713                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 714                         DV_SET(qas, 0);
 715                 } else {
 716                         newperiod = spi_period(starget);
 717                         period = newperiod > period ? newperiod : period;
 718                         if (period < 0x0d)
 719                                 period++;
 720                         else
 721                                 period += period >> 1;
 722
 723                         if (unlikely(period > 0xff || period == prevperiod)) {
 724                                 /* Total failure; set to async and return */
 725                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 726                                 DV_SET(offset, 0);
 727                                 return SPI_COMPARE_FAILURE;
 728                         }
 729                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 730                         DV_SET(period, period);
 731                         prevperiod = period;
 732                 }
 733         }
 734         return retval;
 735 }
 736
 737 static int
 738 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 739 {
 740         int l, result;
 741
 742         /* first off do a test unit ready.  This can error out
 743          * because of reservations or some other reason.  If it
 744          * fails, the device won't let us write to the echo buffer
 745          * so just return failure */
 746
 747         const char spi_test_unit_ready[] = {
 748                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 749         };
 750
 751         const char spi_read_buffer_descriptor[] = {
 752                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 753         };
 754
 755
 756         /* We send a set of three TURs to clear any outstanding
 757          * unit attention conditions if they exist (Otherwise the
 758          * buffer tests won't be happy).  If the TUR still fails
 759          * (reservation conflict, device not ready, etc) just
 760          * skip the write tests */
 761         for (l = 0; ; l++) {
 762                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 763                                      NULL, 0, NULL);
 764
 765                 if(result) {
 766                         if(l >= 3)
 767                                 return 0;
 768                 } else {
 769                         /* TUR succeeded */
 770                         break;
 771                 }
 772         }
 773
 774         result = spi_execute(sdev, spi_read_buffer_descriptor,
 775                              DMA_FROM_DEVICE, buffer, 4, NULL);
 776
 777         if (result)
 778                 /* Device has no echo buffer */
 779                 return 0;
 780
 781         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 782 }
 783
 784 static void
 785 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 786 {
 787         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 788         struct scsi_target *starget = sdev->sdev_target;
 789         struct Scsi_Host *shost = sdev->host;
 790         int len = sdev->inquiry_len;
 791         /* first set us up for narrow async */
 792         DV_SET(offset, 0);
 793         DV_SET(width, 0);
 794
 795         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 796             != SPI_COMPARE_SUCCESS) {
 797                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 798                 /* FIXME: should probably offline the device here? */
 799                 return;
 800         }
 801
 802         /* test width */
 803         if (i->f->set_width && spi_max_width(starget) &&
 804             scsi_device_wide(sdev)) {
 805                 i->f->set_width(starget, 1);
 806
 807                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 808                                                    buffer + len,
 809                                                    DV_LOOPS)
 810                     != SPI_COMPARE_SUCCESS) {
 811                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 812                         i->f->set_width(starget, 0);
 813                 }
 814         }
 815
 816         if (!i->f->set_period)
 817                 return;
 818
 819         /* device can't handle synchronous */
 820         if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
 821                 return;
 822
 823         /* len == -1 is the signal that we need to ascertain the
 824          * presence of an echo buffer before trying to use it.  len ==
 825          * 0 means we don't have an echo buffer */
 826         len = -1;
 827
 828  retry:
 829
 830         /* now set up to the maximum */
 831         DV_SET(offset, spi_max_offset(starget));
 832         DV_SET(period, spi_min_period(starget));
 833         /* try QAS requests; this should be harmless to set if the
 834          * target supports it */
 835         if (scsi_device_qas(sdev)) {
 836                 DV_SET(qas, 1);
 837         } else {
 838                 DV_SET(qas, 0);
 839         }
 840
 841         if (scsi_device_ius(sdev) && spi_min_period(starget) < 9) {
 842                 /* This u320 (or u640). Set IU transfers */
 843                 DV_SET(iu, 1);
 844                 /* Then set the optional parameters */
 845                 DV_SET(rd_strm, 1);
 846                 DV_SET(wr_flow, 1);
 847                 DV_SET(rti, 1);
 848                 if (spi_min_period(starget) == 8)
 849                         DV_SET(pcomp_en, 1);
 850         } else {
 851                 DV_SET(iu, 0);
 852         }
 853
 854         /* now that we've done all this, actually check the bus
 855          * signal type (if known).  Some devices are stupid on
 856          * a SE bus and still claim they can try LVD only settings */
 857         if (i->f->get_signalling)
 858                 i->f->get_signalling(shost);
 859         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 860             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 861             !scsi_device_dt(sdev)) {
 862                 DV_SET(dt, 0);
 863         } else {
 864                 DV_SET(dt, 1);
 865         }
 866         /* Do the read only INQUIRY tests */
 867         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 868                        spi_dv_device_compare_inquiry);
 869         /* See if we actually managed to negotiate and sustain DT */
 870         if (i->f->get_dt)
 871                 i->f->get_dt(starget);
 872
 873         /* see if the device has an echo buffer.  If it does we can do
 874          * the SPI pattern write tests.  Because of some broken
 875          * devices, we *only* try this on a device that has actually
 876          * negotiated DT */
 877
 878         if (len == -1 && spi_dt(starget))
 879                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 880
 881         if (len <= 0) {
 882                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 883                 return;
 884         }
 885
 886         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 887                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 888                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 889         }
 890
 891         if (spi_dv_retrain(sdev, buffer, buffer + len,
 892                            spi_dv_device_echo_buffer)
 893             == SPI_COMPARE_SKIP_TEST) {
 894                 /* OK, the stupid drive can't do a write echo buffer
 895                  * test after all, fall back to the read tests */
 896                 len = 0;
 897                 goto retry;
 898         }
 899 }
 900
 901
 902 /**     spi_dv_device - Do Domain Validation on the device
 903  *      @sdev:          scsi device to validate
 904  *
 905  *      Performs the domain validation on the given device in the
 906  *      current execution thread.  Since DV operations may sleep,
 907  *      the current thread must have user context.  Also no SCSI
 908  *      related locks that would deadlock I/O issued by the DV may
 909  *      be held.
 910  */
 911 void
 912 spi_dv_device(struct scsi_device *sdev)
 913 {
 914         struct scsi_target *starget = sdev->sdev_target;
 915         u8 *buffer;
 916         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 917
 918         if (unlikely(scsi_device_get(sdev)))
 919                 return;
 920
 921         if (unlikely(spi_dv_in_progress(starget)))
 922                 return;
 923         spi_dv_in_progress(starget) = 1;
 924
 925         buffer = kzalloc(len, GFP_KERNEL);
 926
 927         if (unlikely(!buffer))
 928                 goto out_put;
 929
 930         /* We need to verify that the actual device will quiesce; the
 931          * later target quiesce is just a nice to have */
 932         if (unlikely(scsi_device_quiesce(sdev)))
 933                 goto out_free;
 934
 935         scsi_target_quiesce(starget);
 936
 937         spi_dv_pending(starget) = 1;
 938         mutex_lock(&spi_dv_mutex(starget));
 939
 940         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
 941
 942         spi_dv_device_internal(sdev, buffer);
 943
 944         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
 945
 946         mutex_unlock(&spi_dv_mutex(starget));
 947         spi_dv_pending(starget) = 0;
 948
 949         scsi_target_resume(starget);
 950
 951         spi_initial_dv(starget) = 1;
 952
 953  out_free:
 954         kfree(buffer);
 955  out_put:
 956         spi_dv_in_progress(starget) = 0;
 957         scsi_device_put(sdev);
 958 }
 959 EXPORT_SYMBOL(spi_dv_device);
 960
 961 struct work_queue_wrapper {
 962         struct work_struct      work;
 963         struct scsi_device      *sdev;
 964 };
 965
 966 static void
 967 spi_dv_device_work_wrapper(struct work_struct *work)
 968 {
 969         struct work_queue_wrapper *wqw =
 970                 container_of(work, struct work_queue_wrapper, work);
 971         struct scsi_device *sdev = wqw->sdev;
 972
 973         kfree(wqw);
 974         spi_dv_device(sdev);
 975         spi_dv_pending(sdev->sdev_target) = 0;
 976         scsi_device_put(sdev);
 977 }
 978
 979
 980 /**
 981  *      spi_schedule_dv_device - schedule domain validation to occur on the device
 982  *      @sdev:  The device to validate
 983  *
 984  *      Identical to spi_dv_device() above, except that the DV will be
 985  *      scheduled to occur in a workqueue later.  All memory allocations
 986  *      are atomic, so may be called from any context including those holding
 987  *      SCSI locks.
 988  */
 989 void
 990 spi_schedule_dv_device(struct scsi_device *sdev)
 991 {
 992         struct work_queue_wrapper *wqw =
 993                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
 994
 995         if (unlikely(!wqw))
 996                 return;
 997
 998         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
 999                 kfree(wqw);
1000                 return;
1001         }
1002         /* Set pending early (dv_device doesn't check it, only sets it) */
1003         spi_dv_pending(sdev->sdev_target) = 1;
1004         if (unlikely(scsi_device_get(sdev))) {
1005                 kfree(wqw);
1006                 spi_dv_pending(sdev->sdev_target) = 0;
1007                 return;
1008         }
1009
1010         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1011         wqw->sdev = sdev;
1012
1013         schedule_work(&wqw->work);
1014 }
1015 EXPORT_SYMBOL(spi_schedule_dv_device);
1016
1017 /**
1018  * spi_display_xfer_agreement - Print the current target transfer agreement
1019  * @starget: The target for which to display the agreement
1020  *
1021  * Each SPI port is required to maintain a transfer agreement for each
1022  * other port on the bus.  This function prints a one-line summary of
1023  * the current agreement; more detailed information is available in sysfs.
1024  */
1025 void spi_display_xfer_agreement(struct scsi_target *starget)
1026 {
1027         struct spi_transport_attrs *tp;
1028         tp = (struct spi_transport_attrs *)&starget->starget_data;
1029
1030         if (tp->offset > 0 && tp->period > 0) {
1031                 unsigned int picosec, kb100;
1032                 char *scsi = "FAST-?";
1033                 char tmp[8];
1034
1035                 if (tp->period <= SPI_STATIC_PPR) {
1036                         picosec = ppr_to_ps[tp->period];
1037                         switch (tp->period) {
1038                                 case  7: scsi = "FAST-320"; break;
1039                                 case  8: scsi = "FAST-160"; break;
1040                                 case  9: scsi = "FAST-80"; break;
1041                                 case 10:
1042                                 case 11: scsi = "FAST-40"; break;
1043                                 case 12: scsi = "FAST-20"; break;
1044                         }
1045                 } else {
1046                         picosec = tp->period * 4000;
1047                         if (tp->period < 25)
1048                                 scsi = "FAST-20";
1049                         else if (tp->period < 50)
1050                                 scsi = "FAST-10";
1051                         else
1052                                 scsi = "FAST-5";
1053                 }
1054
1055                 kb100 = (10000000 + picosec / 2) / picosec;
1056                 if (tp->width)
1057                         kb100 *= 2;
1058                 sprint_frac(tmp, picosec, 1000);
1059
1060                 dev_info(&starget->dev,
1061                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1062                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1063                          tp->dt ? "DT" : "ST",
1064                          tp->iu ? " IU" : "",
1065                          tp->qas  ? " QAS" : "",
1066                          tp->rd_strm ? " RDSTRM" : "",
1067                          tp->rti ? " RTI" : "",
1068                          tp->wr_flow ? " WRFLOW" : "",
1069                          tp->pcomp_en ? " PCOMP" : "",
1070                          tp->hold_mcs ? " HMCS" : "",
1071                          tmp, tp->offset);
1072         } else {
1073                 dev_info(&starget->dev, "%sasynchronous\n",
1074                                 tp->width ? "wide " : "");
1075         }
1076 }
1077 EXPORT_SYMBOL(spi_display_xfer_agreement);
1078
1079 int spi_populate_width_msg(unsigned char *msg, int width)
1080 {
1081         msg[0] = EXTENDED_MESSAGE;
1082         msg[1] = 2;
1083         msg[2] = EXTENDED_WDTR;
1084         msg[3] = width;
1085         return 4;
1086 }
1087 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1088
1089 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1090 {
1091         msg[0] = EXTENDED_MESSAGE;
1092         msg[1] = 3;
1093         msg[2] = EXTENDED_SDTR;
1094         msg[3] = period;
1095         msg[4] = offset;
1096         return 5;
1097 }
1098 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1099
1100 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1101                 int width, int options)
1102 {
1103         msg[0] = EXTENDED_MESSAGE;
1104         msg[1] = 6;
1105         msg[2] = EXTENDED_PPR;
1106         msg[3] = period;
1107         msg[4] = 0;
1108         msg[5] = offset;
1109         msg[6] = width;
1110         msg[7] = options;
1111         return 8;
1112 }
1113 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1114
1115 #ifdef CONFIG_SCSI_CONSTANTS
1116 static const char * const one_byte_msgs[] = {
1117 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1118 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1119 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1120 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1121 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1122 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1123 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1124 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1125 };
1126
1127 static const char * const two_byte_msgs[] = {
1128 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1129 /* 0x23 */ "Ignore Wide Residue", "ACA"
1130 };
1131
1132 static const char * const extended_msgs[] = {
1133 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1134 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1135 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1136 };
1137
1138 static void print_nego(const unsigned char *msg, int per, int off, int width)
1139 {
1140         if (per) {
1141                 char buf[20];
1142                 period_to_str(buf, msg[per]);
1143                 printk("period = %s ns ", buf);
1144         }
1145
1146         if (off)
1147                 printk("offset = %d ", msg[off]);
1148         if (width)
1149                 printk("width = %d ", 8 << msg[width]);
1150 }
1151
1152 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1153 {
1154         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1155                         msg[msb+3];
1156         printk("%s = %d ", desc, ptr);
1157 }
1158
1159 int spi_print_msg(const unsigned char *msg)
1160 {
1161         int len = 1, i;
1162         if (msg[0] == EXTENDED_MESSAGE) {
1163                 len = 2 + msg[1];
1164                 if (len == 2)
1165                         len += 256;
1166                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1167                         printk ("%s ", extended_msgs[msg[2]]);
1168                 else
1169                         printk ("Extended Message, reserved code (0x%02x) ",
1170                                 (int) msg[2]);
1171                 switch (msg[2]) {
1172                 case EXTENDED_MODIFY_DATA_POINTER:
1173                         print_ptr(msg, 3, "pointer");
1174                         break;
1175                 case EXTENDED_SDTR:
1176                         print_nego(msg, 3, 4, 0);
1177                         break;
1178                 case EXTENDED_WDTR:
1179                         print_nego(msg, 0, 0, 3);
1180                         break;
1181                 case EXTENDED_PPR:
1182                         print_nego(msg, 3, 5, 6);
1183                         break;
1184                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1185                         print_ptr(msg, 3, "out");
1186                         print_ptr(msg, 7, "in");
1187                         break;
1188                 default:
1189                 for (i = 2; i < len; ++i)
1190                         printk("%02x ", msg[i]);
1191                 }
1192         /* Identify */
1193         } else if (msg[0] & 0x80) {
1194                 printk("Identify disconnect %sallowed %s %d ",
1195                         (msg[0] & 0x40) ? "" : "not ",
1196                         (msg[0] & 0x20) ? "target routine" : "lun",
1197                         msg[0] & 0x7);
1198         /* Normal One byte */
1199         } else if (msg[0] < 0x1f) {
1200                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1201                         printk("%s ", one_byte_msgs[msg[0]]);
1202                 else
1203                         printk("reserved (%02x) ", msg[0]);
1204         } else if (msg[0] == 0x55) {
1205                 printk("QAS Request ");
1206         /* Two byte */
1207         } else if (msg[0] <= 0x2f) {
1208                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1209                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1210                                 msg[1]);
1211                 else
1212                         printk("reserved two byte (%02x %02x) ",
1213                                 msg[0], msg[1]);
1214                 len = 2;
1215         } else
1216                 printk("reserved ");
1217         return len;
1218 }
1219 EXPORT_SYMBOL(spi_print_msg);
1220
1221 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1222
1223 int spi_print_msg(const unsigned char *msg)
1224 {
1225         int len = 1, i;
1226
1227         if (msg[0] == EXTENDED_MESSAGE) {
1228                 len = 2 + msg[1];
1229                 if (len == 2)
1230                         len += 256;
1231                 for (i = 0; i < len; ++i)
1232                         printk("%02x ", msg[i]);
1233         /* Identify */
1234         } else if (msg[0] & 0x80) {
1235                 printk("%02x ", msg[0]);
1236         /* Normal One byte */
1237         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1238                 printk("%02x ", msg[0]);
1239         /* Two byte */
1240         } else if (msg[0] <= 0x2f) {
1241                 printk("%02x %02x", msg[0], msg[1]);
1242                 len = 2;
1243         } else
1244                 printk("%02x ", msg[0]);
1245         return len;
1246 }
1247 EXPORT_SYMBOL(spi_print_msg);
1248 #endif /* ! CONFIG_SCSI_CONSTANTS */
1249
1250 #define SETUP_ATTRIBUTE(field)                                          \
1251         i->private_attrs[count] = class_device_attr_##field;            \
1252         if (!i->f->set_##field) {                                       \
1253                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1254                 i->private_attrs[count].store = NULL;                   \
1255         }                                                               \
1256         i->attrs[count] = &i->private_attrs[count];                     \
1257         if (i->f->show_##field)                                         \
1258                 count++
1259
1260 #define SETUP_RELATED_ATTRIBUTE(field, rel_field)                       \
1261         i->private_attrs[count] = class_device_attr_##field;            \
1262         if (!i->f->set_##rel_field) {                                   \
1263                 i->private_attrs[count].attr.mode = S_IRUGO;            \
1264                 i->private_attrs[count].store = NULL;                   \
1265         }                                                               \
1266         i->attrs[count] = &i->private_attrs[count];                     \
1267         if (i->f->show_##rel_field)                                     \
1268                 count++
1269
1270 #define SETUP_HOST_ATTRIBUTE(field)                                     \
1271         i->private_host_attrs[count] = class_device_attr_##field;       \
1272         if (!i->f->set_##field) {                                       \
1273                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1274                 i->private_host_attrs[count].store = NULL;              \
1275         }                                                               \
1276         i->host_attrs[count] = &i->private_host_attrs[count];           \
1277         count++
1278
1279 static int spi_device_match(struct attribute_container *cont,
1280                             struct device *dev)
1281 {
1282         struct scsi_device *sdev;
1283         struct Scsi_Host *shost;
1284         struct spi_internal *i;
1285
1286         if (!scsi_is_sdev_device(dev))
1287                 return 0;
1288
1289         sdev = to_scsi_device(dev);
1290         shost = sdev->host;
1291         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1292             != &spi_host_class.class)
1293                 return 0;
1294         /* Note: this class has no device attributes, so it has
1295          * no per-HBA allocation and thus we don't need to distinguish
1296          * the attribute containers for the device */
1297         i = to_spi_internal(shost->transportt);
1298         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1299                 return 0;
1300         return 1;
1301 }
1302
1303 static int spi_target_match(struct attribute_container *cont,
1304                             struct device *dev)
1305 {
1306         struct Scsi_Host *shost;
1307         struct scsi_target *starget;
1308         struct spi_internal *i;
1309
1310         if (!scsi_is_target_device(dev))
1311                 return 0;
1312
1313         shost = dev_to_shost(dev->parent);
1314         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1315             != &spi_host_class.class)
1316                 return 0;
1317
1318         i = to_spi_internal(shost->transportt);
1319         starget = to_scsi_target(dev);
1320
1321         if (i->f->deny_binding && i->f->deny_binding(starget))
1322                 return 0;
1323
1324         return &i->t.target_attrs.ac == cont;
1325 }
1326
1327 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1328                                "spi_transport",
1329                                spi_setup_transport_attrs,
1330                                NULL,
1331                                NULL);
1332
1333 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1334                                     spi_device_match,
1335                                     spi_device_configure);
1336
1337 struct scsi_transport_template *
1338 spi_attach_transport(struct spi_function_template *ft)
1339 {
1340         int count = 0;
1341         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1342                                          GFP_KERNEL);
1343
1344         if (unlikely(!i))
1345                 return NULL;
1346
1347         i->t.target_attrs.ac.class = &spi_transport_class.class;
1348         i->t.target_attrs.ac.attrs = &i->attrs[0];
1349         i->t.target_attrs.ac.match = spi_target_match;
1350         transport_container_register(&i->t.target_attrs);
1351         i->t.target_size = sizeof(struct spi_transport_attrs);
1352         i->t.host_attrs.ac.class = &spi_host_class.class;
1353         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
1354         i->t.host_attrs.ac.match = spi_host_match;
1355         transport_container_register(&i->t.host_attrs);
1356         i->t.host_size = sizeof(struct spi_host_attrs);
1357         i->f = ft;
1358
1359         SETUP_ATTRIBUTE(period);
1360         SETUP_RELATED_ATTRIBUTE(min_period, period);
1361         SETUP_ATTRIBUTE(offset);
1362         SETUP_RELATED_ATTRIBUTE(max_offset, offset);
1363         SETUP_ATTRIBUTE(width);
1364         SETUP_RELATED_ATTRIBUTE(max_width, width);
1365         SETUP_ATTRIBUTE(iu);
1366         SETUP_ATTRIBUTE(dt);
1367         SETUP_ATTRIBUTE(qas);
1368         SETUP_ATTRIBUTE(wr_flow);
1369         SETUP_ATTRIBUTE(rd_strm);
1370         SETUP_ATTRIBUTE(rti);
1371         SETUP_ATTRIBUTE(pcomp_en);
1372         SETUP_ATTRIBUTE(hold_mcs);
1373
1374         /* if you add an attribute but forget to increase SPI_NUM_ATTRS
1375          * this bug will trigger */
1376         BUG_ON(count > SPI_NUM_ATTRS);
1377
1378         i->attrs[count++] = &class_device_attr_revalidate;
1379
1380         i->attrs[count] = NULL;
1381
1382         count = 0;
1383         SETUP_HOST_ATTRIBUTE(signalling);
1384
1385         BUG_ON(count > SPI_HOST_ATTRS);
1386
1387         i->host_attrs[count] = NULL;
1388
1389         return &i->t;
1390 }
1391 EXPORT_SYMBOL(spi_attach_transport);
1392
1393 void spi_release_transport(struct scsi_transport_template *t)
1394 {
1395         struct spi_internal *i = to_spi_internal(t);
1396
1397         transport_container_unregister(&i->t.target_attrs);
1398         transport_container_unregister(&i->t.host_attrs);
1399
1400         kfree(i);
1401 }
1402 EXPORT_SYMBOL(spi_release_transport);
1403
1404 static __init int spi_transport_init(void)
1405 {
1406         int error = transport_class_register(&spi_transport_class);
1407         if (error)
1408                 return error;
1409         error = anon_transport_class_register(&spi_device_class);
1410         return transport_class_register(&spi_host_class);
1411 }
1412
1413 static void __exit spi_transport_exit(void)
1414 {
1415         transport_class_unregister(&spi_transport_class);
1416         anon_transport_class_unregister(&spi_device_class);
1417         transport_class_unregister(&spi_host_class);
1418 }
1419
1420 MODULE_AUTHOR("Martin Hicks");
1421 MODULE_DESCRIPTION("SPI Transport Attributes");
1422 MODULE_LICENSE("GPL");
1423
1424 module_init(spi_transport_init);
1425 module_exit(spi_transport_exit);