SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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 <linux/sysfs.h>
  28 #include <scsi/scsi.h>
  29 #include "scsi_priv.h"
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_cmnd.h>
  33 #include <scsi/scsi_eh.h>
  34 #include <scsi/scsi_transport.h>
  35 #include <scsi/scsi_transport_spi.h>
  36
  37 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  38 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  39                                  * on" attributes */
  40 #define SPI_HOST_ATTRS  1
  41
  42 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  43
  44 #define DV_LOOPS        3
  45 #define DV_TIMEOUT      (10*HZ)
  46 #define DV_RETRIES      3       /* should only need at most
  47                                  * two cc/ua clears */
  48
  49 /* Our blacklist flags */
  50 enum {
  51         SPI_BLIST_NOIUS = 0x1,
  52 };
  53
  54 /* blacklist table, modelled on scsi_devinfo.c */
  55 static struct {
  56         char *vendor;
  57         char *model;
  58         unsigned flags;
  59 } spi_static_device_list[] __initdata = {
  60         {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
  61         {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
  62         {NULL, NULL, 0}
  63 };
  64
  65 /* Private data accessors (keep these out of the header file) */
  66 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  67 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  68
  69 struct spi_internal {
  70         struct scsi_transport_template t;
  71         struct spi_function_template *f;
  72 };
  73
  74 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  75
  76 static const int ppr_to_ps[] = {
  77         /* The PPR values 0-6 are reserved, fill them in when
  78          * the committee defines them */
  79         -1,                     /* 0x00 */
  80         -1,                     /* 0x01 */
  81         -1,                     /* 0x02 */
  82         -1,                     /* 0x03 */
  83         -1,                     /* 0x04 */
  84         -1,                     /* 0x05 */
  85         -1,                     /* 0x06 */
  86          3125,                  /* 0x07 */
  87          6250,                  /* 0x08 */
  88         12500,                  /* 0x09 */
  89         25000,                  /* 0x0a */
  90         30300,                  /* 0x0b */
  91         50000,                  /* 0x0c */
  92 };
  93 /* The PPR values at which you calculate the period in ns by multiplying
  94  * by 4 */
  95 #define SPI_STATIC_PPR  0x0c
  96
  97 static int sprint_frac(char *dest, int value, int denom)
  98 {
  99         int frac = value % denom;
 100         int result = sprintf(dest, "%d", value / denom);
 101
 102         if (frac == 0)
 103                 return result;
 104         dest[result++] = '.';
 105
 106         do {
 107                 denom /= 10;
 108                 sprintf(dest + result, "%d", frac / denom);
 109                 result++;
 110                 frac %= denom;
 111         } while (frac);
 112
 113         dest[result++] = '\0';
 114         return result;
 115 }
 116
 117 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 118                        enum dma_data_direction dir,
 119                        void *buffer, unsigned bufflen,
 120                        struct scsi_sense_hdr *sshdr)
 121 {
 122         int i, result;
 123         unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 124
 125         for(i = 0; i < DV_RETRIES; i++) {
 126                 result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 127                                       sense, DV_TIMEOUT, /* retries */ 1,
 128                                       REQ_FAILFAST_DEV |
 129                                       REQ_FAILFAST_TRANSPORT |
 130                                       REQ_FAILFAST_DRIVER,
 131                                       NULL);
 132                 if (driver_byte(result) & DRIVER_SENSE) {
 133                         struct scsi_sense_hdr sshdr_tmp;
 134                         if (!sshdr)
 135                                 sshdr = &sshdr_tmp;
 136
 137                         if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 138                                                  sshdr)
 139                             && sshdr->sense_key == UNIT_ATTENTION)
 140                                 continue;
 141                 }
 142                 break;
 143         }
 144         return result;
 145 }
 146
 147 static struct {
 148         enum spi_signal_type    value;
 149         char                    *name;
 150 } signal_types[] = {
 151         { SPI_SIGNAL_UNKNOWN, "unknown" },
 152         { SPI_SIGNAL_SE, "SE" },
 153         { SPI_SIGNAL_LVD, "LVD" },
 154         { SPI_SIGNAL_HVD, "HVD" },
 155 };
 156
 157 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 158 {
 159         int i;
 160
 161         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 162                 if (type == signal_types[i].value)
 163                         return signal_types[i].name;
 164         }
 165         return NULL;
 166 }
 167 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 168 {
 169         int i, len;
 170
 171         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 172                 len =  strlen(signal_types[i].name);
 173                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 174                     (name[len] == '\n' || name[len] == '\0'))
 175                         return signal_types[i].value;
 176         }
 177         return SPI_SIGNAL_UNKNOWN;
 178 }
 179
 180 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 181                           struct device *cdev)
 182 {
 183         struct Scsi_Host *shost = dev_to_shost(dev);
 184
 185         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 186
 187         return 0;
 188 }
 189
 190 static int spi_host_configure(struct transport_container *tc,
 191                               struct device *dev,
 192                               struct device *cdev);
 193
 194 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 195                                "spi_host",
 196                                spi_host_setup,
 197                                NULL,
 198                                spi_host_configure);
 199
 200 static int spi_host_match(struct attribute_container *cont,
 201                           struct device *dev)
 202 {
 203         struct Scsi_Host *shost;
 204
 205         if (!scsi_is_host_device(dev))
 206                 return 0;
 207
 208         shost = dev_to_shost(dev);
 209         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 210             != &spi_host_class.class)
 211                 return 0;
 212
 213         return &shost->transportt->host_attrs.ac == cont;
 214 }
 215
 216 static int spi_target_configure(struct transport_container *tc,
 217                                 struct device *dev,
 218                                 struct device *cdev);
 219
 220 static int spi_device_configure(struct transport_container *tc,
 221                                 struct device *dev,
 222                                 struct device *cdev)
 223 {
 224         struct scsi_device *sdev = to_scsi_device(dev);
 225         struct scsi_target *starget = sdev->sdev_target;
 226         unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
 227                                                       &sdev->inquiry[16],
 228                                                       SCSI_DEVINFO_SPI);
 229
 230         /* Populate the target capability fields with the values
 231          * gleaned from the device inquiry */
 232
 233         spi_support_sync(starget) = scsi_device_sync(sdev);
 234         spi_support_wide(starget) = scsi_device_wide(sdev);
 235         spi_support_dt(starget) = scsi_device_dt(sdev);
 236         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 237         spi_support_ius(starget) = scsi_device_ius(sdev);
 238         if (bflags & SPI_BLIST_NOIUS) {
 239                 dev_info(dev, "Information Units disabled by blacklist\n");
 240                 spi_support_ius(starget) = 0;
 241         }
 242         spi_support_qas(starget) = scsi_device_qas(sdev);
 243
 244         return 0;
 245 }
 246
 247 static int spi_setup_transport_attrs(struct transport_container *tc,
 248                                      struct device *dev,
 249                                      struct device *cdev)
 250 {
 251         struct scsi_target *starget = to_scsi_target(dev);
 252
 253         spi_period(starget) = -1;       /* illegal value */
 254         spi_min_period(starget) = 0;
 255         spi_offset(starget) = 0;        /* async */
 256         spi_max_offset(starget) = 255;
 257         spi_width(starget) = 0; /* narrow */
 258         spi_max_width(starget) = 1;
 259         spi_iu(starget) = 0;    /* no IU */
 260         spi_max_iu(starget) = 1;
 261         spi_dt(starget) = 0;    /* ST */
 262         spi_qas(starget) = 0;
 263         spi_max_qas(starget) = 1;
 264         spi_wr_flow(starget) = 0;
 265         spi_rd_strm(starget) = 0;
 266         spi_rti(starget) = 0;
 267         spi_pcomp_en(starget) = 0;
 268         spi_hold_mcs(starget) = 0;
 269         spi_dv_pending(starget) = 0;
 270         spi_dv_in_progress(starget) = 0;
 271         spi_initial_dv(starget) = 0;
 272         mutex_init(&spi_dv_mutex(starget));
 273
 274         return 0;
 275 }
 276
 277 #define spi_transport_show_simple(field, format_string)                 \
 278                                                                         \
 279 static ssize_t                                                          \
 280 show_spi_transport_##field(struct device *dev,                  \
 281                            struct device_attribute *attr, char *buf)    \
 282 {                                                                       \
 283         struct scsi_target *starget = transport_class_to_starget(dev);  \
 284         struct spi_transport_attrs *tp;                                 \
 285                                                                         \
 286         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 287         return snprintf(buf, 20, format_string, tp->field);             \
 288 }
 289
 290 #define spi_transport_store_simple(field, format_string)                \
 291                                                                         \
 292 static ssize_t                                                          \
 293 store_spi_transport_##field(struct device *dev,                         \
 294                             struct device_attribute *attr,              \
 295                             const char *buf, size_t count)              \
 296 {                                                                       \
 297         int val;                                                        \
 298         struct scsi_target *starget = transport_class_to_starget(dev);  \
 299         struct spi_transport_attrs *tp;                                 \
 300                                                                         \
 301         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 302         val = simple_strtoul(buf, NULL, 0);                             \
 303         tp->field = val;                                                \
 304         return count;                                                   \
 305 }
 306
 307 #define spi_transport_show_function(field, format_string)               \
 308                                                                         \
 309 static ssize_t                                                          \
 310 show_spi_transport_##field(struct device *dev,                  \
 311                            struct device_attribute *attr, char *buf)    \
 312 {                                                                       \
 313         struct scsi_target *starget = transport_class_to_starget(dev);  \
 314         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 315         struct spi_transport_attrs *tp;                                 \
 316         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 317         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 318         if (i->f->get_##field)                                          \
 319                 i->f->get_##field(starget);                             \
 320         return snprintf(buf, 20, format_string, tp->field);             \
 321 }
 322
 323 #define spi_transport_store_function(field, format_string)              \
 324 static ssize_t                                                          \
 325 store_spi_transport_##field(struct device *dev,                         \
 326                             struct device_attribute *attr,              \
 327                             const char *buf, size_t count)              \
 328 {                                                                       \
 329         int val;                                                        \
 330         struct scsi_target *starget = transport_class_to_starget(dev);  \
 331         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 332         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 333                                                                         \
 334         if (!i->f->set_##field)                                         \
 335                 return -EINVAL;                                         \
 336         val = simple_strtoul(buf, NULL, 0);                             \
 337         i->f->set_##field(starget, val);                                \
 338         return count;                                                   \
 339 }
 340
 341 #define spi_transport_store_max(field, format_string)                   \
 342 static ssize_t                                                          \
 343 store_spi_transport_##field(struct device *dev,                         \
 344                             struct device_attribute *attr,              \
 345                             const char *buf, size_t count)              \
 346 {                                                                       \
 347         int val;                                                        \
 348         struct scsi_target *starget = transport_class_to_starget(dev);  \
 349         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 350         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 351         struct spi_transport_attrs *tp                                  \
 352                 = (struct spi_transport_attrs *)&starget->starget_data; \
 353                                                                         \
 354         if (i->f->set_##field)                                          \
 355                 return -EINVAL;                                         \
 356         val = simple_strtoul(buf, NULL, 0);                             \
 357         if (val > tp->max_##field)                                      \
 358                 val = tp->max_##field;                                  \
 359         i->f->set_##field(starget, val);                                \
 360         return count;                                                   \
 361 }
 362
 363 #define spi_transport_rd_attr(field, format_string)                     \
 364         spi_transport_show_function(field, format_string)               \
 365         spi_transport_store_function(field, format_string)              \
 366 static DEVICE_ATTR(field, S_IRUGO,                              \
 367                    show_spi_transport_##field,                  \
 368                    store_spi_transport_##field);
 369
 370 #define spi_transport_simple_attr(field, format_string)                 \
 371         spi_transport_show_simple(field, format_string)                 \
 372         spi_transport_store_simple(field, format_string)                \
 373 static DEVICE_ATTR(field, S_IRUGO,                              \
 374                    show_spi_transport_##field,                  \
 375                    store_spi_transport_##field);
 376
 377 #define spi_transport_max_attr(field, format_string)                    \
 378         spi_transport_show_function(field, format_string)               \
 379         spi_transport_store_max(field, format_string)                   \
 380         spi_transport_simple_attr(max_##field, format_string)           \
 381 static DEVICE_ATTR(field, S_IRUGO,                              \
 382                    show_spi_transport_##field,                  \
 383                    store_spi_transport_##field);
 384
 385 /* The Parallel SCSI Tranport Attributes: */
 386 spi_transport_max_attr(offset, "%d\n");
 387 spi_transport_max_attr(width, "%d\n");
 388 spi_transport_max_attr(iu, "%d\n");
 389 spi_transport_rd_attr(dt, "%d\n");
 390 spi_transport_max_attr(qas, "%d\n");
 391 spi_transport_rd_attr(wr_flow, "%d\n");
 392 spi_transport_rd_attr(rd_strm, "%d\n");
 393 spi_transport_rd_attr(rti, "%d\n");
 394 spi_transport_rd_attr(pcomp_en, "%d\n");
 395 spi_transport_rd_attr(hold_mcs, "%d\n");
 396
 397 /* we only care about the first child device that's a real SCSI device
 398  * so we return 1 to terminate the iteration when we find it */
 399 static int child_iter(struct device *dev, void *data)
 400 {
 401         if (!scsi_is_sdev_device(dev))
 402                 return 0;
 403
 404         spi_dv_device(to_scsi_device(dev));
 405         return 1;
 406 }
 407
 408 static ssize_t
 409 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 410                      const char *buf, size_t count)
 411 {
 412         struct scsi_target *starget = transport_class_to_starget(dev);
 413
 414         device_for_each_child(&starget->dev, NULL, child_iter);
 415         return count;
 416 }
 417 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 418
 419 /* Translate the period into ns according to the current spec
 420  * for SDTR/PPR messages */
 421 static int period_to_str(char *buf, int period)
 422 {
 423         int len, picosec;
 424
 425         if (period < 0 || period > 0xff) {
 426                 picosec = -1;
 427         } else if (period <= SPI_STATIC_PPR) {
 428                 picosec = ppr_to_ps[period];
 429         } else {
 430                 picosec = period * 4000;
 431         }
 432
 433         if (picosec == -1) {
 434                 len = sprintf(buf, "reserved");
 435         } else {
 436                 len = sprint_frac(buf, picosec, 1000);
 437         }
 438
 439         return len;
 440 }
 441
 442 static ssize_t
 443 show_spi_transport_period_helper(char *buf, int period)
 444 {
 445         int len = period_to_str(buf, period);
 446         buf[len++] = '\n';
 447         buf[len] = '\0';
 448         return len;
 449 }
 450
 451 static ssize_t
 452 store_spi_transport_period_helper(struct device *dev, const char *buf,
 453                                   size_t count, int *periodp)
 454 {
 455         int j, picosec, period = -1;
 456         char *endp;
 457
 458         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 459         if (*endp == '.') {
 460                 int mult = 100;
 461                 do {
 462                         endp++;
 463                         if (!isdigit(*endp))
 464                                 break;
 465                         picosec += (*endp - '0') * mult;
 466                         mult /= 10;
 467                 } while (mult > 0);
 468         }
 469
 470         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 471                 if (ppr_to_ps[j] < picosec)
 472                         continue;
 473                 period = j;
 474                 break;
 475         }
 476
 477         if (period == -1)
 478                 period = picosec / 4000;
 479
 480         if (period > 0xff)
 481                 period = 0xff;
 482
 483         *periodp = period;
 484
 485         return count;
 486 }
 487
 488 static ssize_t
 489 show_spi_transport_period(struct device *dev,
 490                           struct device_attribute *attr, char *buf)
 491 {
 492         struct scsi_target *starget = transport_class_to_starget(dev);
 493         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 494         struct spi_internal *i = to_spi_internal(shost->transportt);
 495         struct spi_transport_attrs *tp =
 496                 (struct spi_transport_attrs *)&starget->starget_data;
 497
 498         if (i->f->get_period)
 499                 i->f->get_period(starget);
 500
 501         return show_spi_transport_period_helper(buf, tp->period);
 502 }
 503
 504 static ssize_t
 505 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 506                            const char *buf, size_t count)
 507 {
 508         struct scsi_target *starget = transport_class_to_starget(cdev);
 509         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 510         struct spi_internal *i = to_spi_internal(shost->transportt);
 511         struct spi_transport_attrs *tp =
 512                 (struct spi_transport_attrs *)&starget->starget_data;
 513         int period, retval;
 514
 515         if (!i->f->set_period)
 516                 return -EINVAL;
 517
 518         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 519
 520         if (period < tp->min_period)
 521                 period = tp->min_period;
 522
 523         i->f->set_period(starget, period);
 524
 525         return retval;
 526 }
 527
 528 static DEVICE_ATTR(period, S_IRUGO,
 529                    show_spi_transport_period,
 530                    store_spi_transport_period);
 531
 532 static ssize_t
 533 show_spi_transport_min_period(struct device *cdev,
 534                               struct device_attribute *attr, char *buf)
 535 {
 536         struct scsi_target *starget = transport_class_to_starget(cdev);
 537         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 538         struct spi_internal *i = to_spi_internal(shost->transportt);
 539         struct spi_transport_attrs *tp =
 540                 (struct spi_transport_attrs *)&starget->starget_data;
 541
 542         if (!i->f->set_period)
 543                 return -EINVAL;
 544
 545         return show_spi_transport_period_helper(buf, tp->min_period);
 546 }
 547
 548 static ssize_t
 549 store_spi_transport_min_period(struct device *cdev,
 550                                struct device_attribute *attr,
 551                                const char *buf, size_t count)
 552 {
 553         struct scsi_target *starget = transport_class_to_starget(cdev);
 554         struct spi_transport_attrs *tp =
 555                 (struct spi_transport_attrs *)&starget->starget_data;
 556
 557         return store_spi_transport_period_helper(cdev, buf, count,
 558                                                  &tp->min_period);
 559 }
 560
 561
 562 static DEVICE_ATTR(min_period, S_IRUGO,
 563                    show_spi_transport_min_period,
 564                    store_spi_transport_min_period);
 565
 566
 567 static ssize_t show_spi_host_signalling(struct device *cdev,
 568                                         struct device_attribute *attr,
 569                                         char *buf)
 570 {
 571         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 572         struct spi_internal *i = to_spi_internal(shost->transportt);
 573
 574         if (i->f->get_signalling)
 575                 i->f->get_signalling(shost);
 576
 577         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 578 }
 579 static ssize_t store_spi_host_signalling(struct device *dev,
 580                                          struct device_attribute *attr,
 581                                          const char *buf, size_t count)
 582 {
 583         struct Scsi_Host *shost = transport_class_to_shost(dev);
 584         struct spi_internal *i = to_spi_internal(shost->transportt);
 585         enum spi_signal_type type = spi_signal_to_value(buf);
 586
 587         if (!i->f->set_signalling)
 588                 return -EINVAL;
 589
 590         if (type != SPI_SIGNAL_UNKNOWN)
 591                 i->f->set_signalling(shost, type);
 592
 593         return count;
 594 }
 595 static DEVICE_ATTR(signalling, S_IRUGO,
 596                    show_spi_host_signalling,
 597                    store_spi_host_signalling);
 598
 599 #define DV_SET(x, y)                    \
 600         if(i->f->set_##x)               \
 601                 i->f->set_##x(sdev->sdev_target, y)
 602
 603 enum spi_compare_returns {
 604         SPI_COMPARE_SUCCESS,
 605         SPI_COMPARE_FAILURE,
 606         SPI_COMPARE_SKIP_TEST,
 607 };
 608
 609
 610 /* This is for read/write Domain Validation:  If the device supports
 611  * an echo buffer, we do read/write tests to it */
 612 static enum spi_compare_returns
 613 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 614                           u8 *ptr, const int retries)
 615 {
 616         int len = ptr - buffer;
 617         int j, k, r, result;
 618         unsigned int pattern = 0x0000ffff;
 619         struct scsi_sense_hdr sshdr;
 620
 621         const char spi_write_buffer[] = {
 622                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 623         };
 624         const char spi_read_buffer[] = {
 625                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 626         };
 627
 628         /* set up the pattern buffer.  Doesn't matter if we spill
 629          * slightly beyond since that's where the read buffer is */
 630         for (j = 0; j < len; ) {
 631
 632                 /* fill the buffer with counting (test a) */
 633                 for ( ; j < min(len, 32); j++)
 634                         buffer[j] = j;
 635                 k = j;
 636                 /* fill the buffer with alternating words of 0x0 and
 637                  * 0xffff (test b) */
 638                 for ( ; j < min(len, k + 32); j += 2) {
 639                         u16 *word = (u16 *)&buffer[j];
 640
 641                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 642                 }
 643                 k = j;
 644                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 645                  * (test c) */
 646                 for ( ; j < min(len, k + 32); j += 2) {
 647                         u16 *word = (u16 *)&buffer[j];
 648
 649                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 650                 }
 651                 k = j;
 652                 /* fill with shifting bits (test d) */
 653                 for ( ; j < min(len, k + 32); j += 4) {
 654                         u32 *word = (unsigned int *)&buffer[j];
 655                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 656
 657                         *word = pattern;
 658                         pattern = (pattern << 1) | roll;
 659                 }
 660                 /* don't bother with random data (test e) */
 661         }
 662
 663         for (r = 0; r < retries; r++) {
 664                 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 665                                      buffer, len, &sshdr);
 666                 if(result || !scsi_device_online(sdev)) {
 667
 668                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 669                         if (scsi_sense_valid(&sshdr)
 670                             && sshdr.sense_key == ILLEGAL_REQUEST
 671                             /* INVALID FIELD IN CDB */
 672                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 673                                 /* This would mean that the drive lied
 674                                  * to us about supporting an echo
 675                                  * buffer (unfortunately some Western
 676                                  * Digital drives do precisely this)
 677                                  */
 678                                 return SPI_COMPARE_SKIP_TEST;
 679
 680
 681                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 682                         return SPI_COMPARE_FAILURE;
 683                 }
 684
 685                 memset(ptr, 0, len);
 686                 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 687                             ptr, len, NULL);
 688                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 689
 690                 if (memcmp(buffer, ptr, len) != 0)
 691                         return SPI_COMPARE_FAILURE;
 692         }
 693         return SPI_COMPARE_SUCCESS;
 694 }
 695
 696 /* This is for the simplest form of Domain Validation: a read test
 697  * on the inquiry data from the device */
 698 static enum spi_compare_returns
 699 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 700                               u8 *ptr, const int retries)
 701 {
 702         int r, result;
 703         const int len = sdev->inquiry_len;
 704         const char spi_inquiry[] = {
 705                 INQUIRY, 0, 0, 0, len, 0
 706         };
 707
 708         for (r = 0; r < retries; r++) {
 709                 memset(ptr, 0, len);
 710
 711                 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 712                                      ptr, len, NULL);
 713
 714                 if(result || !scsi_device_online(sdev)) {
 715                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 716                         return SPI_COMPARE_FAILURE;
 717                 }
 718
 719                 /* If we don't have the inquiry data already, the
 720                  * first read gets it */
 721                 if (ptr == buffer) {
 722                         ptr += len;
 723                         --r;
 724                         continue;
 725                 }
 726
 727                 if (memcmp(buffer, ptr, len) != 0)
 728                         /* failure */
 729                         return SPI_COMPARE_FAILURE;
 730         }
 731         return SPI_COMPARE_SUCCESS;
 732 }
 733
 734 static enum spi_compare_returns
 735 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 736                enum spi_compare_returns
 737                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 738 {
 739         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 740         struct scsi_target *starget = sdev->sdev_target;
 741         int period = 0, prevperiod = 0;
 742         enum spi_compare_returns retval;
 743
 744
 745         for (;;) {
 746                 int newperiod;
 747                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 748
 749                 if (retval == SPI_COMPARE_SUCCESS
 750                     || retval == SPI_COMPARE_SKIP_TEST)
 751                         break;
 752
 753                 /* OK, retrain, fallback */
 754                 if (i->f->get_iu)
 755                         i->f->get_iu(starget);
 756                 if (i->f->get_qas)
 757                         i->f->get_qas(starget);
 758                 if (i->f->get_period)
 759                         i->f->get_period(sdev->sdev_target);
 760
 761                 /* Here's the fallback sequence; first try turning off
 762                  * IU, then QAS (if we can control them), then finally
 763                  * fall down the periods */
 764                 if (i->f->set_iu && spi_iu(starget)) {
 765                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 766                         DV_SET(iu, 0);
 767                 } else if (i->f->set_qas && spi_qas(starget)) {
 768                         starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 769                         DV_SET(qas, 0);
 770                 } else {
 771                         newperiod = spi_period(starget);
 772                         period = newperiod > period ? newperiod : period;
 773                         if (period < 0x0d)
 774                                 period++;
 775                         else
 776                                 period += period >> 1;
 777
 778                         if (unlikely(period > 0xff || period == prevperiod)) {
 779                                 /* Total failure; set to async and return */
 780                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 781                                 DV_SET(offset, 0);
 782                                 return SPI_COMPARE_FAILURE;
 783                         }
 784                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 785                         DV_SET(period, period);
 786                         prevperiod = period;
 787                 }
 788         }
 789         return retval;
 790 }
 791
 792 static int
 793 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 794 {
 795         int l, result;
 796
 797         /* first off do a test unit ready.  This can error out
 798          * because of reservations or some other reason.  If it
 799          * fails, the device won't let us write to the echo buffer
 800          * so just return failure */
 801
 802         const char spi_test_unit_ready[] = {
 803                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 804         };
 805
 806         const char spi_read_buffer_descriptor[] = {
 807                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 808         };
 809
 810
 811         /* We send a set of three TURs to clear any outstanding
 812          * unit attention conditions if they exist (Otherwise the
 813          * buffer tests won't be happy).  If the TUR still fails
 814          * (reservation conflict, device not ready, etc) just
 815          * skip the write tests */
 816         for (l = 0; ; l++) {
 817                 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE,
 818                                      NULL, 0, NULL);
 819
 820                 if(result) {
 821                         if(l >= 3)
 822                                 return 0;
 823                 } else {
 824                         /* TUR succeeded */
 825                         break;
 826                 }
 827         }
 828
 829         result = spi_execute(sdev, spi_read_buffer_descriptor,
 830                              DMA_FROM_DEVICE, buffer, 4, NULL);
 831
 832         if (result)
 833                 /* Device has no echo buffer */
 834                 return 0;
 835
 836         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 837 }
 838
 839 static void
 840 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 841 {
 842         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 843         struct scsi_target *starget = sdev->sdev_target;
 844         struct Scsi_Host *shost = sdev->host;
 845         int len = sdev->inquiry_len;
 846         int min_period = spi_min_period(starget);
 847         int max_width = spi_max_width(starget);
 848         /* first set us up for narrow async */
 849         DV_SET(offset, 0);
 850         DV_SET(width, 0);
 851
 852         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 853             != SPI_COMPARE_SUCCESS) {
 854                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 855                 /* FIXME: should probably offline the device here? */
 856                 return;
 857         }
 858
 859         if (!spi_support_wide(starget)) {
 860                 spi_max_width(starget) = 0;
 861                 max_width = 0;
 862         }
 863
 864         /* test width */
 865         if (i->f->set_width && max_width) {
 866                 i->f->set_width(starget, 1);
 867
 868                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 869                                                    buffer + len,
 870                                                    DV_LOOPS)
 871                     != SPI_COMPARE_SUCCESS) {
 872                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 873                         i->f->set_width(starget, 0);
 874                         /* Make sure we don't force wide back on by asking
 875                          * for a transfer period that requires it */
 876                         max_width = 0;
 877                         if (min_period < 10)
 878                                 min_period = 10;
 879                 }
 880         }
 881
 882         if (!i->f->set_period)
 883                 return;
 884
 885         /* device can't handle synchronous */
 886         if (!spi_support_sync(starget) && !spi_support_dt(starget))
 887                 return;
 888
 889         /* len == -1 is the signal that we need to ascertain the
 890          * presence of an echo buffer before trying to use it.  len ==
 891          * 0 means we don't have an echo buffer */
 892         len = -1;
 893
 894  retry:
 895
 896         /* now set up to the maximum */
 897         DV_SET(offset, spi_max_offset(starget));
 898         DV_SET(period, min_period);
 899
 900         /* try QAS requests; this should be harmless to set if the
 901          * target supports it */
 902         if (spi_support_qas(starget) && spi_max_qas(starget)) {
 903                 DV_SET(qas, 1);
 904         } else {
 905                 DV_SET(qas, 0);
 906         }
 907
 908         if (spi_support_ius(starget) && spi_max_iu(starget) &&
 909             min_period < 9) {
 910                 /* This u320 (or u640). Set IU transfers */
 911                 DV_SET(iu, 1);
 912                 /* Then set the optional parameters */
 913                 DV_SET(rd_strm, 1);
 914                 DV_SET(wr_flow, 1);
 915                 DV_SET(rti, 1);
 916                 if (min_period == 8)
 917                         DV_SET(pcomp_en, 1);
 918         } else {
 919                 DV_SET(iu, 0);
 920         }
 921
 922         /* now that we've done all this, actually check the bus
 923          * signal type (if known).  Some devices are stupid on
 924          * a SE bus and still claim they can try LVD only settings */
 925         if (i->f->get_signalling)
 926                 i->f->get_signalling(shost);
 927         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 928             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 929             !spi_support_dt(starget)) {
 930                 DV_SET(dt, 0);
 931         } else {
 932                 DV_SET(dt, 1);
 933         }
 934         /* set width last because it will pull all the other
 935          * parameters down to required values */
 936         DV_SET(width, max_width);
 937
 938         /* Do the read only INQUIRY tests */
 939         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 940                        spi_dv_device_compare_inquiry);
 941         /* See if we actually managed to negotiate and sustain DT */
 942         if (i->f->get_dt)
 943                 i->f->get_dt(starget);
 944
 945         /* see if the device has an echo buffer.  If it does we can do
 946          * the SPI pattern write tests.  Because of some broken
 947          * devices, we *only* try this on a device that has actually
 948          * negotiated DT */
 949
 950         if (len == -1 && spi_dt(starget))
 951                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 952
 953         if (len <= 0) {
 954                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 955                 return;
 956         }
 957
 958         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 959                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 960                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 961         }
 962
 963         if (spi_dv_retrain(sdev, buffer, buffer + len,
 964                            spi_dv_device_echo_buffer)
 965             == SPI_COMPARE_SKIP_TEST) {
 966                 /* OK, the stupid drive can't do a write echo buffer
 967                  * test after all, fall back to the read tests */
 968                 len = 0;
 969                 goto retry;
 970         }
 971 }
 972
 973
 974 /**     spi_dv_device - Do Domain Validation on the device
 975  *      @sdev:          scsi device to validate
 976  *
 977  *      Performs the domain validation on the given device in the
 978  *      current execution thread.  Since DV operations may sleep,
 979  *      the current thread must have user context.  Also no SCSI
 980  *      related locks that would deadlock I/O issued by the DV may
 981  *      be held.
 982  */
 983 void
 984 spi_dv_device(struct scsi_device *sdev)
 985 {
 986         struct scsi_target *starget = sdev->sdev_target;
 987         u8 *buffer;
 988         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 989
 990         if (unlikely(scsi_device_get(sdev)))
 991                 return;
 992
 993         if (unlikely(spi_dv_in_progress(starget)))
 994                 return;
 995         spi_dv_in_progress(starget) = 1;
 996
 997         buffer = kzalloc(len, GFP_KERNEL);
 998
 999         if (unlikely(!buffer))
1000                 goto out_put;
1001
1002         /* We need to verify that the actual device will quiesce; the
1003          * later target quiesce is just a nice to have */
1004         if (unlikely(scsi_device_quiesce(sdev)))
1005                 goto out_free;
1006
1007         scsi_target_quiesce(starget);
1008
1009         spi_dv_pending(starget) = 1;
1010         mutex_lock(&spi_dv_mutex(starget));
1011
1012         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1013
1014         spi_dv_device_internal(sdev, buffer);
1015
1016         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1017
1018         mutex_unlock(&spi_dv_mutex(starget));
1019         spi_dv_pending(starget) = 0;
1020
1021         scsi_target_resume(starget);
1022
1023         spi_initial_dv(starget) = 1;
1024
1025  out_free:
1026         kfree(buffer);
1027  out_put:
1028         spi_dv_in_progress(starget) = 0;
1029         scsi_device_put(sdev);
1030 }
1031 EXPORT_SYMBOL(spi_dv_device);
1032
1033 struct work_queue_wrapper {
1034         struct work_struct      work;
1035         struct scsi_device      *sdev;
1036 };
1037
1038 static void
1039 spi_dv_device_work_wrapper(struct work_struct *work)
1040 {
1041         struct work_queue_wrapper *wqw =
1042                 container_of(work, struct work_queue_wrapper, work);
1043         struct scsi_device *sdev = wqw->sdev;
1044
1045         kfree(wqw);
1046         spi_dv_device(sdev);
1047         spi_dv_pending(sdev->sdev_target) = 0;
1048         scsi_device_put(sdev);
1049 }
1050
1051
1052 /**
1053  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1054  *      @sdev:  The device to validate
1055  *
1056  *      Identical to spi_dv_device() above, except that the DV will be
1057  *      scheduled to occur in a workqueue later.  All memory allocations
1058  *      are atomic, so may be called from any context including those holding
1059  *      SCSI locks.
1060  */
1061 void
1062 spi_schedule_dv_device(struct scsi_device *sdev)
1063 {
1064         struct work_queue_wrapper *wqw =
1065                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1066
1067         if (unlikely(!wqw))
1068                 return;
1069
1070         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1071                 kfree(wqw);
1072                 return;
1073         }
1074         /* Set pending early (dv_device doesn't check it, only sets it) */
1075         spi_dv_pending(sdev->sdev_target) = 1;
1076         if (unlikely(scsi_device_get(sdev))) {
1077                 kfree(wqw);
1078                 spi_dv_pending(sdev->sdev_target) = 0;
1079                 return;
1080         }
1081
1082         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1083         wqw->sdev = sdev;
1084
1085         schedule_work(&wqw->work);
1086 }
1087 EXPORT_SYMBOL(spi_schedule_dv_device);
1088
1089 /**
1090  * spi_display_xfer_agreement - Print the current target transfer agreement
1091  * @starget: The target for which to display the agreement
1092  *
1093  * Each SPI port is required to maintain a transfer agreement for each
1094  * other port on the bus.  This function prints a one-line summary of
1095  * the current agreement; more detailed information is available in sysfs.
1096  */
1097 void spi_display_xfer_agreement(struct scsi_target *starget)
1098 {
1099         struct spi_transport_attrs *tp;
1100         tp = (struct spi_transport_attrs *)&starget->starget_data;
1101
1102         if (tp->offset > 0 && tp->period > 0) {
1103                 unsigned int picosec, kb100;
1104                 char *scsi = "FAST-?";
1105                 char tmp[8];
1106
1107                 if (tp->period <= SPI_STATIC_PPR) {
1108                         picosec = ppr_to_ps[tp->period];
1109                         switch (tp->period) {
1110                                 case  7: scsi = "FAST-320"; break;
1111                                 case  8: scsi = "FAST-160"; break;
1112                                 case  9: scsi = "FAST-80"; break;
1113                                 case 10:
1114                                 case 11: scsi = "FAST-40"; break;
1115                                 case 12: scsi = "FAST-20"; break;
1116                         }
1117                 } else {
1118                         picosec = tp->period * 4000;
1119                         if (tp->period < 25)
1120                                 scsi = "FAST-20";
1121                         else if (tp->period < 50)
1122                                 scsi = "FAST-10";
1123                         else
1124                                 scsi = "FAST-5";
1125                 }
1126
1127                 kb100 = (10000000 + picosec / 2) / picosec;
1128                 if (tp->width)
1129                         kb100 *= 2;
1130                 sprint_frac(tmp, picosec, 1000);
1131
1132                 dev_info(&starget->dev,
1133                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1134                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1135                          tp->dt ? "DT" : "ST",
1136                          tp->iu ? " IU" : "",
1137                          tp->qas  ? " QAS" : "",
1138                          tp->rd_strm ? " RDSTRM" : "",
1139                          tp->rti ? " RTI" : "",
1140                          tp->wr_flow ? " WRFLOW" : "",
1141                          tp->pcomp_en ? " PCOMP" : "",
1142                          tp->hold_mcs ? " HMCS" : "",
1143                          tmp, tp->offset);
1144         } else {
1145                 dev_info(&starget->dev, "%sasynchronous\n",
1146                                 tp->width ? "wide " : "");
1147         }
1148 }
1149 EXPORT_SYMBOL(spi_display_xfer_agreement);
1150
1151 int spi_populate_width_msg(unsigned char *msg, int width)
1152 {
1153         msg[0] = EXTENDED_MESSAGE;
1154         msg[1] = 2;
1155         msg[2] = EXTENDED_WDTR;
1156         msg[3] = width;
1157         return 4;
1158 }
1159 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1160
1161 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1162 {
1163         msg[0] = EXTENDED_MESSAGE;
1164         msg[1] = 3;
1165         msg[2] = EXTENDED_SDTR;
1166         msg[3] = period;
1167         msg[4] = offset;
1168         return 5;
1169 }
1170 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1171
1172 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1173                 int width, int options)
1174 {
1175         msg[0] = EXTENDED_MESSAGE;
1176         msg[1] = 6;
1177         msg[2] = EXTENDED_PPR;
1178         msg[3] = period;
1179         msg[4] = 0;
1180         msg[5] = offset;
1181         msg[6] = width;
1182         msg[7] = options;
1183         return 8;
1184 }
1185 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1186
1187 #ifdef CONFIG_SCSI_CONSTANTS
1188 static const char * const one_byte_msgs[] = {
1189 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1190 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1191 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1192 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1193 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1194 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1195 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1196 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1197 };
1198
1199 static const char * const two_byte_msgs[] = {
1200 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1201 /* 0x23 */ "Ignore Wide Residue", "ACA"
1202 };
1203
1204 static const char * const extended_msgs[] = {
1205 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1206 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1207 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1208 };
1209
1210 static void print_nego(const unsigned char *msg, int per, int off, int width)
1211 {
1212         if (per) {
1213                 char buf[20];
1214                 period_to_str(buf, msg[per]);
1215                 printk("period = %s ns ", buf);
1216         }
1217
1218         if (off)
1219                 printk("offset = %d ", msg[off]);
1220         if (width)
1221                 printk("width = %d ", 8 << msg[width]);
1222 }
1223
1224 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1225 {
1226         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1227                         msg[msb+3];
1228         printk("%s = %d ", desc, ptr);
1229 }
1230
1231 int spi_print_msg(const unsigned char *msg)
1232 {
1233         int len = 1, i;
1234         if (msg[0] == EXTENDED_MESSAGE) {
1235                 len = 2 + msg[1];
1236                 if (len == 2)
1237                         len += 256;
1238                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1239                         printk ("%s ", extended_msgs[msg[2]]);
1240                 else
1241                         printk ("Extended Message, reserved code (0x%02x) ",
1242                                 (int) msg[2]);
1243                 switch (msg[2]) {
1244                 case EXTENDED_MODIFY_DATA_POINTER:
1245                         print_ptr(msg, 3, "pointer");
1246                         break;
1247                 case EXTENDED_SDTR:
1248                         print_nego(msg, 3, 4, 0);
1249                         break;
1250                 case EXTENDED_WDTR:
1251                         print_nego(msg, 0, 0, 3);
1252                         break;
1253                 case EXTENDED_PPR:
1254                         print_nego(msg, 3, 5, 6);
1255                         break;
1256                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1257                         print_ptr(msg, 3, "out");
1258                         print_ptr(msg, 7, "in");
1259                         break;
1260                 default:
1261                 for (i = 2; i < len; ++i)
1262                         printk("%02x ", msg[i]);
1263                 }
1264         /* Identify */
1265         } else if (msg[0] & 0x80) {
1266                 printk("Identify disconnect %sallowed %s %d ",
1267                         (msg[0] & 0x40) ? "" : "not ",
1268                         (msg[0] & 0x20) ? "target routine" : "lun",
1269                         msg[0] & 0x7);
1270         /* Normal One byte */
1271         } else if (msg[0] < 0x1f) {
1272                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1273                         printk("%s ", one_byte_msgs[msg[0]]);
1274                 else
1275                         printk("reserved (%02x) ", msg[0]);
1276         } else if (msg[0] == 0x55) {
1277                 printk("QAS Request ");
1278         /* Two byte */
1279         } else if (msg[0] <= 0x2f) {
1280                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1281                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1282                                 msg[1]);
1283                 else
1284                         printk("reserved two byte (%02x %02x) ",
1285                                 msg[0], msg[1]);
1286                 len = 2;
1287         } else
1288                 printk("reserved ");
1289         return len;
1290 }
1291 EXPORT_SYMBOL(spi_print_msg);
1292
1293 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1294
1295 int spi_print_msg(const unsigned char *msg)
1296 {
1297         int len = 1, i;
1298
1299         if (msg[0] == EXTENDED_MESSAGE) {
1300                 len = 2 + msg[1];
1301                 if (len == 2)
1302                         len += 256;
1303                 for (i = 0; i < len; ++i)
1304                         printk("%02x ", msg[i]);
1305         /* Identify */
1306         } else if (msg[0] & 0x80) {
1307                 printk("%02x ", msg[0]);
1308         /* Normal One byte */
1309         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1310                 printk("%02x ", msg[0]);
1311         /* Two byte */
1312         } else if (msg[0] <= 0x2f) {
1313                 printk("%02x %02x", msg[0], msg[1]);
1314                 len = 2;
1315         } else
1316                 printk("%02x ", msg[0]);
1317         return len;
1318 }
1319 EXPORT_SYMBOL(spi_print_msg);
1320 #endif /* ! CONFIG_SCSI_CONSTANTS */
1321
1322 static int spi_device_match(struct attribute_container *cont,
1323                             struct device *dev)
1324 {
1325         struct scsi_device *sdev;
1326         struct Scsi_Host *shost;
1327         struct spi_internal *i;
1328
1329         if (!scsi_is_sdev_device(dev))
1330                 return 0;
1331
1332         sdev = to_scsi_device(dev);
1333         shost = sdev->host;
1334         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1335             != &spi_host_class.class)
1336                 return 0;
1337         /* Note: this class has no device attributes, so it has
1338          * no per-HBA allocation and thus we don't need to distinguish
1339          * the attribute containers for the device */
1340         i = to_spi_internal(shost->transportt);
1341         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1342                 return 0;
1343         return 1;
1344 }
1345
1346 static int spi_target_match(struct attribute_container *cont,
1347                             struct device *dev)
1348 {
1349         struct Scsi_Host *shost;
1350         struct scsi_target *starget;
1351         struct spi_internal *i;
1352
1353         if (!scsi_is_target_device(dev))
1354                 return 0;
1355
1356         shost = dev_to_shost(dev->parent);
1357         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1358             != &spi_host_class.class)
1359                 return 0;
1360
1361         i = to_spi_internal(shost->transportt);
1362         starget = to_scsi_target(dev);
1363
1364         if (i->f->deny_binding && i->f->deny_binding(starget))
1365                 return 0;
1366
1367         return &i->t.target_attrs.ac == cont;
1368 }
1369
1370 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1371                                "spi_transport",
1372                                spi_setup_transport_attrs,
1373                                NULL,
1374                                spi_target_configure);
1375
1376 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1377                                     spi_device_match,
1378                                     spi_device_configure);
1379
1380 static struct attribute *host_attributes[] = {
1381         &dev_attr_signalling.attr,
1382         NULL
1383 };
1384
1385 static struct attribute_group host_attribute_group = {
1386         .attrs = host_attributes,
1387 };
1388
1389 static int spi_host_configure(struct transport_container *tc,
1390                               struct device *dev,
1391                               struct device *cdev)
1392 {
1393         struct kobject *kobj = &cdev->kobj;
1394         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1395         struct spi_internal *si = to_spi_internal(shost->transportt);
1396         struct attribute *attr = &dev_attr_signalling.attr;
1397         int rc = 0;
1398
1399         if (si->f->set_signalling)
1400                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1401
1402         return rc;
1403 }
1404
1405 /* returns true if we should be showing the variable.  Also
1406  * overloads the return by setting 1<<1 if the attribute should
1407  * be writeable */
1408 #define TARGET_ATTRIBUTE_HELPER(name) \
1409         (si->f->show_##name ? S_IRUGO : 0) | \
1410         (si->f->set_##name ? S_IWUSR : 0)
1411
1412 static mode_t target_attribute_is_visible(struct kobject *kobj,
1413                                           struct attribute *attr, int i)
1414 {
1415         struct device *cdev = container_of(kobj, struct device, kobj);
1416         struct scsi_target *starget = transport_class_to_starget(cdev);
1417         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1418         struct spi_internal *si = to_spi_internal(shost->transportt);
1419
1420         if (attr == &dev_attr_period.attr &&
1421             spi_support_sync(starget))
1422                 return TARGET_ATTRIBUTE_HELPER(period);
1423         else if (attr == &dev_attr_min_period.attr &&
1424                  spi_support_sync(starget))
1425                 return TARGET_ATTRIBUTE_HELPER(period);
1426         else if (attr == &dev_attr_offset.attr &&
1427                  spi_support_sync(starget))
1428                 return TARGET_ATTRIBUTE_HELPER(offset);
1429         else if (attr == &dev_attr_max_offset.attr &&
1430                  spi_support_sync(starget))
1431                 return TARGET_ATTRIBUTE_HELPER(offset);
1432         else if (attr == &dev_attr_width.attr &&
1433                  spi_support_wide(starget))
1434                 return TARGET_ATTRIBUTE_HELPER(width);
1435         else if (attr == &dev_attr_max_width.attr &&
1436                  spi_support_wide(starget))
1437                 return TARGET_ATTRIBUTE_HELPER(width);
1438         else if (attr == &dev_attr_iu.attr &&
1439                  spi_support_ius(starget))
1440                 return TARGET_ATTRIBUTE_HELPER(iu);
1441         else if (attr == &dev_attr_max_iu.attr &&
1442                  spi_support_ius(starget))
1443                 return TARGET_ATTRIBUTE_HELPER(iu);
1444         else if (attr == &dev_attr_dt.attr &&
1445                  spi_support_dt(starget))
1446                 return TARGET_ATTRIBUTE_HELPER(dt);
1447         else if (attr == &dev_attr_qas.attr &&
1448                  spi_support_qas(starget))
1449                 return TARGET_ATTRIBUTE_HELPER(qas);
1450         else if (attr == &dev_attr_max_qas.attr &&
1451                  spi_support_qas(starget))
1452                 return TARGET_ATTRIBUTE_HELPER(qas);
1453         else if (attr == &dev_attr_wr_flow.attr &&
1454                  spi_support_ius(starget))
1455                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1456         else if (attr == &dev_attr_rd_strm.attr &&
1457                  spi_support_ius(starget))
1458                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1459         else if (attr == &dev_attr_rti.attr &&
1460                  spi_support_ius(starget))
1461                 return TARGET_ATTRIBUTE_HELPER(rti);
1462         else if (attr == &dev_attr_pcomp_en.attr &&
1463                  spi_support_ius(starget))
1464                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1465         else if (attr == &dev_attr_hold_mcs.attr &&
1466                  spi_support_ius(starget))
1467                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1468         else if (attr == &dev_attr_revalidate.attr)
1469                 return S_IWUSR;
1470
1471         return 0;
1472 }
1473
1474 static struct attribute *target_attributes[] = {
1475         &dev_attr_period.attr,
1476         &dev_attr_min_period.attr,
1477         &dev_attr_offset.attr,
1478         &dev_attr_max_offset.attr,
1479         &dev_attr_width.attr,
1480         &dev_attr_max_width.attr,
1481         &dev_attr_iu.attr,
1482         &dev_attr_max_iu.attr,
1483         &dev_attr_dt.attr,
1484         &dev_attr_qas.attr,
1485         &dev_attr_max_qas.attr,
1486         &dev_attr_wr_flow.attr,
1487         &dev_attr_rd_strm.attr,
1488         &dev_attr_rti.attr,
1489         &dev_attr_pcomp_en.attr,
1490         &dev_attr_hold_mcs.attr,
1491         &dev_attr_revalidate.attr,
1492         NULL
1493 };
1494
1495 static struct attribute_group target_attribute_group = {
1496         .attrs = target_attributes,
1497         .is_visible = target_attribute_is_visible,
1498 };
1499
1500 static int spi_target_configure(struct transport_container *tc,
1501                                 struct device *dev,
1502                                 struct device *cdev)
1503 {
1504         struct kobject *kobj = &cdev->kobj;
1505
1506         /* force an update based on parameters read from the device */
1507         sysfs_update_group(kobj, &target_attribute_group);
1508
1509         return 0;
1510 }
1511
1512 struct scsi_transport_template *
1513 spi_attach_transport(struct spi_function_template *ft)
1514 {
1515         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1516                                          GFP_KERNEL);
1517
1518         if (unlikely(!i))
1519                 return NULL;
1520
1521         i->t.target_attrs.ac.class = &spi_transport_class.class;
1522         i->t.target_attrs.ac.grp = &target_attribute_group;
1523         i->t.target_attrs.ac.match = spi_target_match;
1524         transport_container_register(&i->t.target_attrs);
1525         i->t.target_size = sizeof(struct spi_transport_attrs);
1526         i->t.host_attrs.ac.class = &spi_host_class.class;
1527         i->t.host_attrs.ac.grp = &host_attribute_group;
1528         i->t.host_attrs.ac.match = spi_host_match;
1529         transport_container_register(&i->t.host_attrs);
1530         i->t.host_size = sizeof(struct spi_host_attrs);
1531         i->f = ft;
1532
1533         return &i->t;
1534 }
1535 EXPORT_SYMBOL(spi_attach_transport);
1536
1537 void spi_release_transport(struct scsi_transport_template *t)
1538 {
1539         struct spi_internal *i = to_spi_internal(t);
1540
1541         transport_container_unregister(&i->t.target_attrs);
1542         transport_container_unregister(&i->t.host_attrs);
1543
1544         kfree(i);
1545 }
1546 EXPORT_SYMBOL(spi_release_transport);
1547
1548 static __init int spi_transport_init(void)
1549 {
1550         int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1551                                            "SCSI Parallel Transport Class");
1552         if (!error) {
1553                 int i;
1554
1555                 for (i = 0; spi_static_device_list[i].vendor; i++)
1556                         scsi_dev_info_list_add_keyed(1, /* compatible */
1557                                                      spi_static_device_list[i].vendor,
1558                                                      spi_static_device_list[i].model,
1559                                                      NULL,
1560                                                      spi_static_device_list[i].flags,
1561                                                      SCSI_DEVINFO_SPI);
1562         }
1563
1564         error = transport_class_register(&spi_transport_class);
1565         if (error)
1566                 return error;
1567         error = anon_transport_class_register(&spi_device_class);
1568         return transport_class_register(&spi_host_class);
1569 }
1570
1571 static void __exit spi_transport_exit(void)
1572 {
1573         transport_class_unregister(&spi_transport_class);
1574         anon_transport_class_unregister(&spi_device_class);
1575         transport_class_unregister(&spi_host_class);
1576         scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1577 }
1578
1579 MODULE_AUTHOR("Martin Hicks");
1580 MODULE_DESCRIPTION("SPI Transport Attributes");
1581 MODULE_LICENSE("GPL");
1582
1583 module_init(spi_transport_init);
1584 module_exit(spi_transport_exit);