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