drivers/scsi/scsi_transport_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   4  *
   5  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   6  *  Copyright (c) 2004, 2005 James Bottomley <[email protected]>
   7  */
   8 #include <linux/ctype.h>
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/workqueue.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/mutex.h>
  14 #include <linux/sysfs.h>
  15 #include <linux/slab.h>
  16 #include <linux/suspend.h>
  17 #include <scsi/scsi.h>
  18 #include "scsi_priv.h"
  19 #include <scsi/scsi_device.h>
  20 #include <scsi/scsi_host.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_tcq.h>
  24 #include <scsi/scsi_transport.h>
  25 #include <scsi/scsi_transport_spi.h>
  26
  27 #define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  28 #define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  29                                  * on" attributes */
  30 #define SPI_HOST_ATTRS  1
  31
  32 #define SPI_MAX_ECHO_BUFFER_SIZE        4096
  33
  34 #define DV_LOOPS        3
  35 #define DV_TIMEOUT      (10*HZ)
  36 #define DV_RETRIES      3       /* should only need at most
  37                                  * two cc/ua clears */
  38
  39 /* Our blacklist flags */
  40 enum {
  41         SPI_BLIST_NOIUS = (__force blist_flags_t)0x1,
  42 };
  43
  44 /* blacklist table, modelled on scsi_devinfo.c */
  45 static struct {
  46         char *vendor;
  47         char *model;
  48         blist_flags_t flags;
  49 } spi_static_device_list[] __initdata = {
  50         {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
  51         {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
  52         {NULL, NULL, 0}
  53 };
  54
  55 /* Private data accessors (keep these out of the header file) */
  56 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  57 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  58
  59 struct spi_internal {
  60         struct scsi_transport_template t;
  61         struct spi_function_template *f;
  62 };
  63
  64 #define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  65
  66 static const int ppr_to_ps[] = {
  67         /* The PPR values 0-6 are reserved, fill them in when
  68          * the committee defines them */
  69         -1,                     /* 0x00 */
  70         -1,                     /* 0x01 */
  71         -1,                     /* 0x02 */
  72         -1,                     /* 0x03 */
  73         -1,                     /* 0x04 */
  74         -1,                     /* 0x05 */
  75         -1,                     /* 0x06 */
  76          3125,                  /* 0x07 */
  77          6250,                  /* 0x08 */
  78         12500,                  /* 0x09 */
  79         25000,                  /* 0x0a */
  80         30300,                  /* 0x0b */
  81         50000,                  /* 0x0c */
  82 };
  83 /* The PPR values at which you calculate the period in ns by multiplying
  84  * by 4 */
  85 #define SPI_STATIC_PPR  0x0c
  86
  87 static int sprint_frac(char *dest, int value, int denom)
  88 {
  89         int frac = value % denom;
  90         int result = sprintf(dest, "%d", value / denom);
  91
  92         if (frac == 0)
  93                 return result;
  94         dest[result++] = '.';
  95
  96         do {
  97                 denom /= 10;
  98                 sprintf(dest + result, "%d", frac / denom);
  99                 result++;
 100                 frac %= denom;
 101         } while (frac);
 102
 103         dest[result++] = '\0';
 104         return result;
 105 }
 106
 107 static int spi_execute(struct scsi_device *sdev, const void *cmd,
 108                        enum req_op op, void *buffer, unsigned int bufflen,
 109                        struct scsi_sense_hdr *sshdr)
 110 {
 111         int i, result;
 112         struct scsi_sense_hdr sshdr_tmp;
 113         blk_opf_t opf = op | REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
 114                         REQ_FAILFAST_DRIVER;
 115         const struct scsi_exec_args exec_args = {
 116                 .req_flags = BLK_MQ_REQ_PM,
 117                 .sshdr = sshdr ? : &sshdr_tmp,
 118         };
 119
 120         sshdr = exec_args.sshdr;
 121
 122         for(i = 0; i < DV_RETRIES; i++) {
 123                 /*
 124                  * The purpose of the RQF_PM flag below is to bypass the
 125                  * SDEV_QUIESCE state.
 126                  */
 127                 result = scsi_execute_cmd(sdev, cmd, opf, buffer, bufflen,
 128                                           DV_TIMEOUT, 1, &exec_args);
 129                 if (result < 0 || !scsi_sense_valid(sshdr) ||
 130                     sshdr->sense_key != UNIT_ATTENTION)
 131                         break;
 132         }
 133         return result;
 134 }
 135
 136 static struct {
 137         enum spi_signal_type    value;
 138         char                    *name;
 139 } signal_types[] = {
 140         { SPI_SIGNAL_UNKNOWN, "unknown" },
 141         { SPI_SIGNAL_SE, "SE" },
 142         { SPI_SIGNAL_LVD, "LVD" },
 143         { SPI_SIGNAL_HVD, "HVD" },
 144 };
 145
 146 static inline const char *spi_signal_to_string(enum spi_signal_type type)
 147 {
 148         int i;
 149
 150         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 151                 if (type == signal_types[i].value)
 152                         return signal_types[i].name;
 153         }
 154         return NULL;
 155 }
 156 static inline enum spi_signal_type spi_signal_to_value(const char *name)
 157 {
 158         int i, len;
 159
 160         for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 161                 len =  strlen(signal_types[i].name);
 162                 if (strncmp(name, signal_types[i].name, len) == 0 &&
 163                     (name[len] == '\n' || name[len] == '\0'))
 164                         return signal_types[i].value;
 165         }
 166         return SPI_SIGNAL_UNKNOWN;
 167 }
 168
 169 static int spi_host_setup(struct transport_container *tc, struct device *dev,
 170                           struct device *cdev)
 171 {
 172         struct Scsi_Host *shost = dev_to_shost(dev);
 173
 174         spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 175
 176         return 0;
 177 }
 178
 179 static int spi_host_configure(struct transport_container *tc,
 180                               struct device *dev,
 181                               struct device *cdev);
 182
 183 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 184                                "spi_host",
 185                                spi_host_setup,
 186                                NULL,
 187                                spi_host_configure);
 188
 189 static int spi_host_match(struct attribute_container *cont,
 190                           struct device *dev)
 191 {
 192         struct Scsi_Host *shost;
 193
 194         if (!scsi_is_host_device(dev))
 195                 return 0;
 196
 197         shost = dev_to_shost(dev);
 198         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 199             != &spi_host_class.class)
 200                 return 0;
 201
 202         return &shost->transportt->host_attrs.ac == cont;
 203 }
 204
 205 static int spi_target_configure(struct transport_container *tc,
 206                                 struct device *dev,
 207                                 struct device *cdev);
 208
 209 static int spi_device_configure(struct transport_container *tc,
 210                                 struct device *dev,
 211                                 struct device *cdev)
 212 {
 213         struct scsi_device *sdev = to_scsi_device(dev);
 214         struct scsi_target *starget = sdev->sdev_target;
 215         blist_flags_t bflags;
 216
 217         bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
 218                                              &sdev->inquiry[16],
 219                                              SCSI_DEVINFO_SPI);
 220
 221         /* Populate the target capability fields with the values
 222          * gleaned from the device inquiry */
 223
 224         spi_support_sync(starget) = scsi_device_sync(sdev);
 225         spi_support_wide(starget) = scsi_device_wide(sdev);
 226         spi_support_dt(starget) = scsi_device_dt(sdev);
 227         spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 228         spi_support_ius(starget) = scsi_device_ius(sdev);
 229         if (bflags & SPI_BLIST_NOIUS) {
 230                 dev_info(dev, "Information Units disabled by blacklist\n");
 231                 spi_support_ius(starget) = 0;
 232         }
 233         spi_support_qas(starget) = scsi_device_qas(sdev);
 234
 235         return 0;
 236 }
 237
 238 static int spi_setup_transport_attrs(struct transport_container *tc,
 239                                      struct device *dev,
 240                                      struct device *cdev)
 241 {
 242         struct scsi_target *starget = to_scsi_target(dev);
 243
 244         spi_period(starget) = -1;       /* illegal value */
 245         spi_min_period(starget) = 0;
 246         spi_offset(starget) = 0;        /* async */
 247         spi_max_offset(starget) = 255;
 248         spi_width(starget) = 0; /* narrow */
 249         spi_max_width(starget) = 1;
 250         spi_iu(starget) = 0;    /* no IU */
 251         spi_max_iu(starget) = 1;
 252         spi_dt(starget) = 0;    /* ST */
 253         spi_qas(starget) = 0;
 254         spi_max_qas(starget) = 1;
 255         spi_wr_flow(starget) = 0;
 256         spi_rd_strm(starget) = 0;
 257         spi_rti(starget) = 0;
 258         spi_pcomp_en(starget) = 0;
 259         spi_hold_mcs(starget) = 0;
 260         spi_dv_pending(starget) = 0;
 261         spi_dv_in_progress(starget) = 0;
 262         spi_initial_dv(starget) = 0;
 263         mutex_init(&spi_dv_mutex(starget));
 264
 265         return 0;
 266 }
 267
 268 #define spi_transport_show_simple(field, format_string)                 \
 269                                                                         \
 270 static ssize_t                                                          \
 271 show_spi_transport_##field(struct device *dev,                  \
 272                            struct device_attribute *attr, char *buf)    \
 273 {                                                                       \
 274         struct scsi_target *starget = transport_class_to_starget(dev);  \
 275         struct spi_transport_attrs *tp;                                 \
 276                                                                         \
 277         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 278         return snprintf(buf, 20, format_string, tp->field);             \
 279 }
 280
 281 #define spi_transport_store_simple(field, format_string)                \
 282                                                                         \
 283 static ssize_t                                                          \
 284 store_spi_transport_##field(struct device *dev,                         \
 285                             struct device_attribute *attr,              \
 286                             const char *buf, size_t count)              \
 287 {                                                                       \
 288         int val;                                                        \
 289         struct scsi_target *starget = transport_class_to_starget(dev);  \
 290         struct spi_transport_attrs *tp;                                 \
 291                                                                         \
 292         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 293         val = simple_strtoul(buf, NULL, 0);                             \
 294         tp->field = val;                                                \
 295         return count;                                                   \
 296 }
 297
 298 #define spi_transport_show_function(field, format_string)               \
 299                                                                         \
 300 static ssize_t                                                          \
 301 show_spi_transport_##field(struct device *dev,                  \
 302                            struct device_attribute *attr, char *buf)    \
 303 {                                                                       \
 304         struct scsi_target *starget = transport_class_to_starget(dev);  \
 305         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 306         struct spi_transport_attrs *tp;                                 \
 307         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 308         tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 309         if (i->f->get_##field)                                          \
 310                 i->f->get_##field(starget);                             \
 311         return snprintf(buf, 20, format_string, tp->field);             \
 312 }
 313
 314 #define spi_transport_store_function(field, format_string)              \
 315 static ssize_t                                                          \
 316 store_spi_transport_##field(struct device *dev,                         \
 317                             struct device_attribute *attr,              \
 318                             const char *buf, size_t count)              \
 319 {                                                                       \
 320         int val;                                                        \
 321         struct scsi_target *starget = transport_class_to_starget(dev);  \
 322         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 323         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 324                                                                         \
 325         if (!i->f->set_##field)                                         \
 326                 return -EINVAL;                                         \
 327         val = simple_strtoul(buf, NULL, 0);                             \
 328         i->f->set_##field(starget, val);                                \
 329         return count;                                                   \
 330 }
 331
 332 #define spi_transport_store_max(field, format_string)                   \
 333 static ssize_t                                                          \
 334 store_spi_transport_##field(struct device *dev,                         \
 335                             struct device_attribute *attr,              \
 336                             const char *buf, size_t count)              \
 337 {                                                                       \
 338         int val;                                                        \
 339         struct scsi_target *starget = transport_class_to_starget(dev);  \
 340         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 341         struct spi_internal *i = to_spi_internal(shost->transportt);    \
 342         struct spi_transport_attrs *tp                                  \
 343                 = (struct spi_transport_attrs *)&starget->starget_data; \
 344                                                                         \
 345         if (!i->f->set_##field)                                         \
 346                 return -EINVAL;                                         \
 347         val = simple_strtoul(buf, NULL, 0);                             \
 348         if (val > tp->max_##field)                                      \
 349                 val = tp->max_##field;                                  \
 350         i->f->set_##field(starget, val);                                \
 351         return count;                                                   \
 352 }
 353
 354 #define spi_transport_rd_attr(field, format_string)                     \
 355         spi_transport_show_function(field, format_string)               \
 356         spi_transport_store_function(field, format_string)              \
 357 static DEVICE_ATTR(field, S_IRUGO,                              \
 358                    show_spi_transport_##field,                  \
 359                    store_spi_transport_##field);
 360
 361 #define spi_transport_simple_attr(field, format_string)                 \
 362         spi_transport_show_simple(field, format_string)                 \
 363         spi_transport_store_simple(field, format_string)                \
 364 static DEVICE_ATTR(field, S_IRUGO,                              \
 365                    show_spi_transport_##field,                  \
 366                    store_spi_transport_##field);
 367
 368 #define spi_transport_max_attr(field, format_string)                    \
 369         spi_transport_show_function(field, format_string)               \
 370         spi_transport_store_max(field, format_string)                   \
 371         spi_transport_simple_attr(max_##field, format_string)           \
 372 static DEVICE_ATTR(field, S_IRUGO,                              \
 373                    show_spi_transport_##field,                  \
 374                    store_spi_transport_##field);
 375
 376 /* The Parallel SCSI Tranport Attributes: */
 377 spi_transport_max_attr(offset, "%d\n");
 378 spi_transport_max_attr(width, "%d\n");
 379 spi_transport_max_attr(iu, "%d\n");
 380 spi_transport_rd_attr(dt, "%d\n");
 381 spi_transport_max_attr(qas, "%d\n");
 382 spi_transport_rd_attr(wr_flow, "%d\n");
 383 spi_transport_rd_attr(rd_strm, "%d\n");
 384 spi_transport_rd_attr(rti, "%d\n");
 385 spi_transport_rd_attr(pcomp_en, "%d\n");
 386 spi_transport_rd_attr(hold_mcs, "%d\n");
 387
 388 /* we only care about the first child device that's a real SCSI device
 389  * so we return 1 to terminate the iteration when we find it */
 390 static int child_iter(struct device *dev, void *data)
 391 {
 392         if (!scsi_is_sdev_device(dev))
 393                 return 0;
 394
 395         spi_dv_device(to_scsi_device(dev));
 396         return 1;
 397 }
 398
 399 static ssize_t
 400 store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 401                      const char *buf, size_t count)
 402 {
 403         struct scsi_target *starget = transport_class_to_starget(dev);
 404
 405         device_for_each_child(&starget->dev, NULL, child_iter);
 406         return count;
 407 }
 408 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 409
 410 /* Translate the period into ns according to the current spec
 411  * for SDTR/PPR messages */
 412 static int period_to_str(char *buf, int period)
 413 {
 414         int len, picosec;
 415
 416         if (period < 0 || period > 0xff) {
 417                 picosec = -1;
 418         } else if (period <= SPI_STATIC_PPR) {
 419                 picosec = ppr_to_ps[period];
 420         } else {
 421                 picosec = period * 4000;
 422         }
 423
 424         if (picosec == -1) {
 425                 len = sprintf(buf, "reserved");
 426         } else {
 427                 len = sprint_frac(buf, picosec, 1000);
 428         }
 429
 430         return len;
 431 }
 432
 433 static ssize_t
 434 show_spi_transport_period_helper(char *buf, int period)
 435 {
 436         int len = period_to_str(buf, period);
 437         buf[len++] = '\n';
 438         buf[len] = '\0';
 439         return len;
 440 }
 441
 442 static ssize_t
 443 store_spi_transport_period_helper(struct device *dev, const char *buf,
 444                                   size_t count, int *periodp)
 445 {
 446         int j, picosec, period = -1;
 447         char *endp;
 448
 449         picosec = simple_strtoul(buf, &endp, 10) * 1000;
 450         if (*endp == '.') {
 451                 int mult = 100;
 452                 do {
 453                         endp++;
 454                         if (!isdigit(*endp))
 455                                 break;
 456                         picosec += (*endp - '0') * mult;
 457                         mult /= 10;
 458                 } while (mult > 0);
 459         }
 460
 461         for (j = 0; j <= SPI_STATIC_PPR; j++) {
 462                 if (ppr_to_ps[j] < picosec)
 463                         continue;
 464                 period = j;
 465                 break;
 466         }
 467
 468         if (period == -1)
 469                 period = picosec / 4000;
 470
 471         if (period > 0xff)
 472                 period = 0xff;
 473
 474         *periodp = period;
 475
 476         return count;
 477 }
 478
 479 static ssize_t
 480 show_spi_transport_period(struct device *dev,
 481                           struct device_attribute *attr, char *buf)
 482 {
 483         struct scsi_target *starget = transport_class_to_starget(dev);
 484         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 485         struct spi_internal *i = to_spi_internal(shost->transportt);
 486         struct spi_transport_attrs *tp =
 487                 (struct spi_transport_attrs *)&starget->starget_data;
 488
 489         if (i->f->get_period)
 490                 i->f->get_period(starget);
 491
 492         return show_spi_transport_period_helper(buf, tp->period);
 493 }
 494
 495 static ssize_t
 496 store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 497                            const char *buf, size_t count)
 498 {
 499         struct scsi_target *starget = transport_class_to_starget(cdev);
 500         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 501         struct spi_internal *i = to_spi_internal(shost->transportt);
 502         struct spi_transport_attrs *tp =
 503                 (struct spi_transport_attrs *)&starget->starget_data;
 504         int period, retval;
 505
 506         if (!i->f->set_period)
 507                 return -EINVAL;
 508
 509         retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 510
 511         if (period < tp->min_period)
 512                 period = tp->min_period;
 513
 514         i->f->set_period(starget, period);
 515
 516         return retval;
 517 }
 518
 519 static DEVICE_ATTR(period, S_IRUGO,
 520                    show_spi_transport_period,
 521                    store_spi_transport_period);
 522
 523 static ssize_t
 524 show_spi_transport_min_period(struct device *cdev,
 525                               struct device_attribute *attr, char *buf)
 526 {
 527         struct scsi_target *starget = transport_class_to_starget(cdev);
 528         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 529         struct spi_internal *i = to_spi_internal(shost->transportt);
 530         struct spi_transport_attrs *tp =
 531                 (struct spi_transport_attrs *)&starget->starget_data;
 532
 533         if (!i->f->set_period)
 534                 return -EINVAL;
 535
 536         return show_spi_transport_period_helper(buf, tp->min_period);
 537 }
 538
 539 static ssize_t
 540 store_spi_transport_min_period(struct device *cdev,
 541                                struct device_attribute *attr,
 542                                const char *buf, size_t count)
 543 {
 544         struct scsi_target *starget = transport_class_to_starget(cdev);
 545         struct spi_transport_attrs *tp =
 546                 (struct spi_transport_attrs *)&starget->starget_data;
 547
 548         return store_spi_transport_period_helper(cdev, buf, count,
 549                                                  &tp->min_period);
 550 }
 551
 552
 553 static DEVICE_ATTR(min_period, S_IRUGO,
 554                    show_spi_transport_min_period,
 555                    store_spi_transport_min_period);
 556
 557
 558 static ssize_t show_spi_host_signalling(struct device *cdev,
 559                                         struct device_attribute *attr,
 560                                         char *buf)
 561 {
 562         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 563         struct spi_internal *i = to_spi_internal(shost->transportt);
 564
 565         if (i->f->get_signalling)
 566                 i->f->get_signalling(shost);
 567
 568         return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 569 }
 570 static ssize_t store_spi_host_signalling(struct device *dev,
 571                                          struct device_attribute *attr,
 572                                          const char *buf, size_t count)
 573 {
 574         struct Scsi_Host *shost = transport_class_to_shost(dev);
 575         struct spi_internal *i = to_spi_internal(shost->transportt);
 576         enum spi_signal_type type = spi_signal_to_value(buf);
 577
 578         if (!i->f->set_signalling)
 579                 return -EINVAL;
 580
 581         if (type != SPI_SIGNAL_UNKNOWN)
 582                 i->f->set_signalling(shost, type);
 583
 584         return count;
 585 }
 586 static DEVICE_ATTR(signalling, S_IRUGO,
 587                    show_spi_host_signalling,
 588                    store_spi_host_signalling);
 589
 590 static ssize_t show_spi_host_width(struct device *cdev,
 591                                       struct device_attribute *attr,
 592                                       char *buf)
 593 {
 594         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 595
 596         return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow");
 597 }
 598 static DEVICE_ATTR(host_width, S_IRUGO,
 599                    show_spi_host_width, NULL);
 600
 601 static ssize_t show_spi_host_hba_id(struct device *cdev,
 602                                     struct device_attribute *attr,
 603                                     char *buf)
 604 {
 605         struct Scsi_Host *shost = transport_class_to_shost(cdev);
 606
 607         return sprintf(buf, "%d\n", shost->this_id);
 608 }
 609 static DEVICE_ATTR(hba_id, S_IRUGO,
 610                    show_spi_host_hba_id, NULL);
 611
 612 #define DV_SET(x, y)                    \
 613         if(i->f->set_##x)               \
 614                 i->f->set_##x(sdev->sdev_target, y)
 615
 616 enum spi_compare_returns {
 617         SPI_COMPARE_SUCCESS,
 618         SPI_COMPARE_FAILURE,
 619         SPI_COMPARE_SKIP_TEST,
 620 };
 621
 622
 623 /* This is for read/write Domain Validation:  If the device supports
 624  * an echo buffer, we do read/write tests to it */
 625 static enum spi_compare_returns
 626 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 627                           u8 *ptr, const int retries)
 628 {
 629         int len = ptr - buffer;
 630         int j, k, r, result;
 631         unsigned int pattern = 0x0000ffff;
 632         struct scsi_sense_hdr sshdr;
 633
 634         const char spi_write_buffer[] = {
 635                 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 636         };
 637         const char spi_read_buffer[] = {
 638                 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 639         };
 640
 641         /* set up the pattern buffer.  Doesn't matter if we spill
 642          * slightly beyond since that's where the read buffer is */
 643         for (j = 0; j < len; ) {
 644
 645                 /* fill the buffer with counting (test a) */
 646                 for ( ; j < min(len, 32); j++)
 647                         buffer[j] = j;
 648                 k = j;
 649                 /* fill the buffer with alternating words of 0x0 and
 650                  * 0xffff (test b) */
 651                 for ( ; j < min(len, k + 32); j += 2) {
 652                         u16 *word = (u16 *)&buffer[j];
 653
 654                         *word = (j & 0x02) ? 0x0000 : 0xffff;
 655                 }
 656                 k = j;
 657                 /* fill with crosstalk (alternating 0x5555 0xaaa)
 658                  * (test c) */
 659                 for ( ; j < min(len, k + 32); j += 2) {
 660                         u16 *word = (u16 *)&buffer[j];
 661
 662                         *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 663                 }
 664                 k = j;
 665                 /* fill with shifting bits (test d) */
 666                 for ( ; j < min(len, k + 32); j += 4) {
 667                         u32 *word = (unsigned int *)&buffer[j];
 668                         u32 roll = (pattern & 0x80000000) ? 1 : 0;
 669
 670                         *word = pattern;
 671                         pattern = (pattern << 1) | roll;
 672                 }
 673                 /* don't bother with random data (test e) */
 674         }
 675
 676         for (r = 0; r < retries; r++) {
 677                 result = spi_execute(sdev, spi_write_buffer, REQ_OP_DRV_OUT,
 678                                      buffer, len, &sshdr);
 679                 if (result || !scsi_device_online(sdev)) {
 680
 681                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 682                         if (result > 0 && scsi_sense_valid(&sshdr)
 683                             && sshdr.sense_key == ILLEGAL_REQUEST
 684                             /* INVALID FIELD IN CDB */
 685                             && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 686                                 /* This would mean that the drive lied
 687                                  * to us about supporting an echo
 688                                  * buffer (unfortunately some Western
 689                                  * Digital drives do precisely this)
 690                                  */
 691                                 return SPI_COMPARE_SKIP_TEST;
 692
 693
 694                         sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 695                         return SPI_COMPARE_FAILURE;
 696                 }
 697
 698                 memset(ptr, 0, len);
 699                 spi_execute(sdev, spi_read_buffer, REQ_OP_DRV_IN,
 700                             ptr, len, NULL);
 701                 scsi_device_set_state(sdev, SDEV_QUIESCE);
 702
 703                 if (memcmp(buffer, ptr, len) != 0)
 704                         return SPI_COMPARE_FAILURE;
 705         }
 706         return SPI_COMPARE_SUCCESS;
 707 }
 708
 709 /* This is for the simplest form of Domain Validation: a read test
 710  * on the inquiry data from the device */
 711 static enum spi_compare_returns
 712 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 713                               u8 *ptr, const int retries)
 714 {
 715         int r, result;
 716         const int len = sdev->inquiry_len;
 717         const char spi_inquiry[] = {
 718                 INQUIRY, 0, 0, 0, len, 0
 719         };
 720
 721         for (r = 0; r < retries; r++) {
 722                 memset(ptr, 0, len);
 723
 724                 result = spi_execute(sdev, spi_inquiry, REQ_OP_DRV_IN,
 725                                      ptr, len, NULL);
 726
 727                 if(result || !scsi_device_online(sdev)) {
 728                         scsi_device_set_state(sdev, SDEV_QUIESCE);
 729                         return SPI_COMPARE_FAILURE;
 730                 }
 731
 732                 /* If we don't have the inquiry data already, the
 733                  * first read gets it */
 734                 if (ptr == buffer) {
 735                         ptr += len;
 736                         --r;
 737                         continue;
 738                 }
 739
 740                 if (memcmp(buffer, ptr, len) != 0)
 741                         /* failure */
 742                         return SPI_COMPARE_FAILURE;
 743         }
 744         return SPI_COMPARE_SUCCESS;
 745 }
 746
 747 static enum spi_compare_returns
 748 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 749                enum spi_compare_returns
 750                (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 751 {
 752         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 753         struct scsi_target *starget = sdev->sdev_target;
 754         int period = 0, prevperiod = 0;
 755         enum spi_compare_returns retval;
 756
 757
 758         for (;;) {
 759                 int newperiod;
 760                 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 761
 762                 if (retval == SPI_COMPARE_SUCCESS
 763                     || retval == SPI_COMPARE_SKIP_TEST)
 764                         break;
 765
 766                 /* OK, retrain, fallback */
 767                 if (i->f->get_iu)
 768                         i->f->get_iu(starget);
 769                 if (i->f->get_qas)
 770                         i->f->get_qas(starget);
 771                 if (i->f->get_period)
 772                         i->f->get_period(sdev->sdev_target);
 773
 774                 /* Here's the fallback sequence; first try turning off
 775                  * IU, then QAS (if we can control them), then finally
 776                  * fall down the periods */
 777                 if (i->f->set_iu && spi_iu(starget)) {
 778                         starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n");
 779                         DV_SET(iu, 0);
 780                 } else if (i->f->set_qas && spi_qas(starget)) {
 781                         starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n");
 782                         DV_SET(qas, 0);
 783                 } else {
 784                         newperiod = spi_period(starget);
 785                         period = newperiod > period ? newperiod : period;
 786                         if (period < 0x0d)
 787                                 period++;
 788                         else
 789                                 period += period >> 1;
 790
 791                         if (unlikely(period > 0xff || period == prevperiod)) {
 792                                 /* Total failure; set to async and return */
 793                                 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 794                                 DV_SET(offset, 0);
 795                                 return SPI_COMPARE_FAILURE;
 796                         }
 797                         starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 798                         DV_SET(period, period);
 799                         prevperiod = period;
 800                 }
 801         }
 802         return retval;
 803 }
 804
 805 static int
 806 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 807 {
 808         int l, result;
 809
 810         /* first off do a test unit ready.  This can error out
 811          * because of reservations or some other reason.  If it
 812          * fails, the device won't let us write to the echo buffer
 813          * so just return failure */
 814
 815         static const char spi_test_unit_ready[] = {
 816                 TEST_UNIT_READY, 0, 0, 0, 0, 0
 817         };
 818
 819         static const char spi_read_buffer_descriptor[] = {
 820                 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 821         };
 822
 823
 824         /* We send a set of three TURs to clear any outstanding
 825          * unit attention conditions if they exist (Otherwise the
 826          * buffer tests won't be happy).  If the TUR still fails
 827          * (reservation conflict, device not ready, etc) just
 828          * skip the write tests */
 829         for (l = 0; ; l++) {
 830                 result = spi_execute(sdev, spi_test_unit_ready, REQ_OP_DRV_IN,
 831                                      NULL, 0, NULL);
 832
 833                 if(result) {
 834                         if(l >= 3)
 835                                 return 0;
 836                 } else {
 837                         /* TUR succeeded */
 838                         break;
 839                 }
 840         }
 841
 842         result = spi_execute(sdev, spi_read_buffer_descriptor,
 843                              REQ_OP_DRV_IN, buffer, 4, NULL);
 844
 845         if (result)
 846                 /* Device has no echo buffer */
 847                 return 0;
 848
 849         return buffer[3] + ((buffer[2] & 0x1f) << 8);
 850 }
 851
 852 static void
 853 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 854 {
 855         struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 856         struct scsi_target *starget = sdev->sdev_target;
 857         struct Scsi_Host *shost = sdev->host;
 858         int len = sdev->inquiry_len;
 859         int min_period = spi_min_period(starget);
 860         int max_width = spi_max_width(starget);
 861         /* first set us up for narrow async */
 862         DV_SET(offset, 0);
 863         DV_SET(width, 0);
 864
 865         if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 866             != SPI_COMPARE_SUCCESS) {
 867                 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 868                 /* FIXME: should probably offline the device here? */
 869                 return;
 870         }
 871
 872         if (!spi_support_wide(starget)) {
 873                 spi_max_width(starget) = 0;
 874                 max_width = 0;
 875         }
 876
 877         /* test width */
 878         if (i->f->set_width && max_width) {
 879                 i->f->set_width(starget, 1);
 880
 881                 if (spi_dv_device_compare_inquiry(sdev, buffer,
 882                                                    buffer + len,
 883                                                    DV_LOOPS)
 884                     != SPI_COMPARE_SUCCESS) {
 885                         starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 886                         i->f->set_width(starget, 0);
 887                         /* Make sure we don't force wide back on by asking
 888                          * for a transfer period that requires it */
 889                         max_width = 0;
 890                         if (min_period < 10)
 891                                 min_period = 10;
 892                 }
 893         }
 894
 895         if (!i->f->set_period)
 896                 return;
 897
 898         /* device can't handle synchronous */
 899         if (!spi_support_sync(starget) && !spi_support_dt(starget))
 900                 return;
 901
 902         /* len == -1 is the signal that we need to ascertain the
 903          * presence of an echo buffer before trying to use it.  len ==
 904          * 0 means we don't have an echo buffer */
 905         len = -1;
 906
 907  retry:
 908
 909         /* now set up to the maximum */
 910         DV_SET(offset, spi_max_offset(starget));
 911         DV_SET(period, min_period);
 912
 913         /* try QAS requests; this should be harmless to set if the
 914          * target supports it */
 915         if (spi_support_qas(starget) && spi_max_qas(starget)) {
 916                 DV_SET(qas, 1);
 917         } else {
 918                 DV_SET(qas, 0);
 919         }
 920
 921         if (spi_support_ius(starget) && spi_max_iu(starget) &&
 922             min_period < 9) {
 923                 /* This u320 (or u640). Set IU transfers */
 924                 DV_SET(iu, 1);
 925                 /* Then set the optional parameters */
 926                 DV_SET(rd_strm, 1);
 927                 DV_SET(wr_flow, 1);
 928                 DV_SET(rti, 1);
 929                 if (min_period == 8)
 930                         DV_SET(pcomp_en, 1);
 931         } else {
 932                 DV_SET(iu, 0);
 933         }
 934
 935         /* now that we've done all this, actually check the bus
 936          * signal type (if known).  Some devices are stupid on
 937          * a SE bus and still claim they can try LVD only settings */
 938         if (i->f->get_signalling)
 939                 i->f->get_signalling(shost);
 940         if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 941             spi_signalling(shost) == SPI_SIGNAL_HVD ||
 942             !spi_support_dt(starget)) {
 943                 DV_SET(dt, 0);
 944         } else {
 945                 DV_SET(dt, 1);
 946         }
 947         /* set width last because it will pull all the other
 948          * parameters down to required values */
 949         DV_SET(width, max_width);
 950
 951         /* Do the read only INQUIRY tests */
 952         spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 953                        spi_dv_device_compare_inquiry);
 954         /* See if we actually managed to negotiate and sustain DT */
 955         if (i->f->get_dt)
 956                 i->f->get_dt(starget);
 957
 958         /* see if the device has an echo buffer.  If it does we can do
 959          * the SPI pattern write tests.  Because of some broken
 960          * devices, we *only* try this on a device that has actually
 961          * negotiated DT */
 962
 963         if (len == -1 && spi_dt(starget))
 964                 len = spi_dv_device_get_echo_buffer(sdev, buffer);
 965
 966         if (len <= 0) {
 967                 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 968                 return;
 969         }
 970
 971         if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 972                 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 973                 len = SPI_MAX_ECHO_BUFFER_SIZE;
 974         }
 975
 976         if (spi_dv_retrain(sdev, buffer, buffer + len,
 977                            spi_dv_device_echo_buffer)
 978             == SPI_COMPARE_SKIP_TEST) {
 979                 /* OK, the stupid drive can't do a write echo buffer
 980                  * test after all, fall back to the read tests */
 981                 len = 0;
 982                 goto retry;
 983         }
 984 }
 985
 986
 987 /**     spi_dv_device - Do Domain Validation on the device
 988  *      @sdev:          scsi device to validate
 989  *
 990  *      Performs the domain validation on the given device in the
 991  *      current execution thread.  Since DV operations may sleep,
 992  *      the current thread must have user context.  Also no SCSI
 993  *      related locks that would deadlock I/O issued by the DV may
 994  *      be held.
 995  */
 996 void
 997 spi_dv_device(struct scsi_device *sdev)
 998 {
 999         struct scsi_target *starget = sdev->sdev_target;
1000         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
1001         unsigned int sleep_flags;
1002         u8 *buffer;
1003
1004         /*
1005          * Because this function and the power management code both call
1006          * scsi_device_quiesce(), it is not safe to perform domain validation
1007          * while suspend or resume is in progress. Hence the
1008          * lock/unlock_system_sleep() calls.
1009          */
1010         sleep_flags = lock_system_sleep();
1011
1012         if (scsi_autopm_get_device(sdev))
1013                 goto unlock_system_sleep;
1014
1015         if (unlikely(spi_dv_in_progress(starget)))
1016                 goto put_autopm;
1017
1018         if (unlikely(scsi_device_get(sdev)))
1019                 goto put_autopm;
1020
1021         spi_dv_in_progress(starget) = 1;
1022
1023         buffer = kzalloc(len, GFP_KERNEL);
1024
1025         if (unlikely(!buffer))
1026                 goto put_sdev;
1027
1028         /* We need to verify that the actual device will quiesce; the
1029          * later target quiesce is just a nice to have */
1030         if (unlikely(scsi_device_quiesce(sdev)))
1031                 goto free_buffer;
1032
1033         scsi_target_quiesce(starget);
1034
1035         spi_dv_pending(starget) = 1;
1036         mutex_lock(&spi_dv_mutex(starget));
1037
1038         starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1039
1040         spi_dv_device_internal(sdev, buffer);
1041
1042         starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1043
1044         mutex_unlock(&spi_dv_mutex(starget));
1045         spi_dv_pending(starget) = 0;
1046
1047         scsi_target_resume(starget);
1048
1049         spi_initial_dv(starget) = 1;
1050
1051 free_buffer:
1052         kfree(buffer);
1053
1054 put_sdev:
1055         spi_dv_in_progress(starget) = 0;
1056         scsi_device_put(sdev);
1057 put_autopm:
1058         scsi_autopm_put_device(sdev);
1059
1060 unlock_system_sleep:
1061         unlock_system_sleep(sleep_flags);
1062 }
1063 EXPORT_SYMBOL(spi_dv_device);
1064
1065 struct work_queue_wrapper {
1066         struct work_struct      work;
1067         struct scsi_device      *sdev;
1068 };
1069
1070 static void
1071 spi_dv_device_work_wrapper(struct work_struct *work)
1072 {
1073         struct work_queue_wrapper *wqw =
1074                 container_of(work, struct work_queue_wrapper, work);
1075         struct scsi_device *sdev = wqw->sdev;
1076
1077         kfree(wqw);
1078         spi_dv_device(sdev);
1079         spi_dv_pending(sdev->sdev_target) = 0;
1080         scsi_device_put(sdev);
1081 }
1082
1083
1084 /**
1085  *      spi_schedule_dv_device - schedule domain validation to occur on the device
1086  *      @sdev:  The device to validate
1087  *
1088  *      Identical to spi_dv_device() above, except that the DV will be
1089  *      scheduled to occur in a workqueue later.  All memory allocations
1090  *      are atomic, so may be called from any context including those holding
1091  *      SCSI locks.
1092  */
1093 void
1094 spi_schedule_dv_device(struct scsi_device *sdev)
1095 {
1096         struct work_queue_wrapper *wqw =
1097                 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1098
1099         if (unlikely(!wqw))
1100                 return;
1101
1102         if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1103                 kfree(wqw);
1104                 return;
1105         }
1106         /* Set pending early (dv_device doesn't check it, only sets it) */
1107         spi_dv_pending(sdev->sdev_target) = 1;
1108         if (unlikely(scsi_device_get(sdev))) {
1109                 kfree(wqw);
1110                 spi_dv_pending(sdev->sdev_target) = 0;
1111                 return;
1112         }
1113
1114         INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1115         wqw->sdev = sdev;
1116
1117         schedule_work(&wqw->work);
1118 }
1119 EXPORT_SYMBOL(spi_schedule_dv_device);
1120
1121 /**
1122  * spi_display_xfer_agreement - Print the current target transfer agreement
1123  * @starget: The target for which to display the agreement
1124  *
1125  * Each SPI port is required to maintain a transfer agreement for each
1126  * other port on the bus.  This function prints a one-line summary of
1127  * the current agreement; more detailed information is available in sysfs.
1128  */
1129 void spi_display_xfer_agreement(struct scsi_target *starget)
1130 {
1131         struct spi_transport_attrs *tp;
1132         tp = (struct spi_transport_attrs *)&starget->starget_data;
1133
1134         if (tp->offset > 0 && tp->period > 0) {
1135                 unsigned int picosec, kb100;
1136                 char *scsi = "FAST-?";
1137                 char tmp[8];
1138
1139                 if (tp->period <= SPI_STATIC_PPR) {
1140                         picosec = ppr_to_ps[tp->period];
1141                         switch (tp->period) {
1142                                 case  7: scsi = "FAST-320"; break;
1143                                 case  8: scsi = "FAST-160"; break;
1144                                 case  9: scsi = "FAST-80"; break;
1145                                 case 10:
1146                                 case 11: scsi = "FAST-40"; break;
1147                                 case 12: scsi = "FAST-20"; break;
1148                         }
1149                 } else {
1150                         picosec = tp->period * 4000;
1151                         if (tp->period < 25)
1152                                 scsi = "FAST-20";
1153                         else if (tp->period < 50)
1154                                 scsi = "FAST-10";
1155                         else
1156                                 scsi = "FAST-5";
1157                 }
1158
1159                 kb100 = (10000000 + picosec / 2) / picosec;
1160                 if (tp->width)
1161                         kb100 *= 2;
1162                 sprint_frac(tmp, picosec, 1000);
1163
1164                 dev_info(&starget->dev,
1165                          "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1166                          scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1167                          tp->dt ? "DT" : "ST",
1168                          tp->iu ? " IU" : "",
1169                          tp->qas  ? " QAS" : "",
1170                          tp->rd_strm ? " RDSTRM" : "",
1171                          tp->rti ? " RTI" : "",
1172                          tp->wr_flow ? " WRFLOW" : "",
1173                          tp->pcomp_en ? " PCOMP" : "",
1174                          tp->hold_mcs ? " HMCS" : "",
1175                          tmp, tp->offset);
1176         } else {
1177                 dev_info(&starget->dev, "%sasynchronous\n",
1178                                 tp->width ? "wide " : "");
1179         }
1180 }
1181 EXPORT_SYMBOL(spi_display_xfer_agreement);
1182
1183 int spi_populate_width_msg(unsigned char *msg, int width)
1184 {
1185         msg[0] = EXTENDED_MESSAGE;
1186         msg[1] = 2;
1187         msg[2] = EXTENDED_WDTR;
1188         msg[3] = width;
1189         return 4;
1190 }
1191 EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1192
1193 int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1194 {
1195         msg[0] = EXTENDED_MESSAGE;
1196         msg[1] = 3;
1197         msg[2] = EXTENDED_SDTR;
1198         msg[3] = period;
1199         msg[4] = offset;
1200         return 5;
1201 }
1202 EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1203
1204 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1205                 int width, int options)
1206 {
1207         msg[0] = EXTENDED_MESSAGE;
1208         msg[1] = 6;
1209         msg[2] = EXTENDED_PPR;
1210         msg[3] = period;
1211         msg[4] = 0;
1212         msg[5] = offset;
1213         msg[6] = width;
1214         msg[7] = options;
1215         return 8;
1216 }
1217 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1218
1219 /**
1220  * spi_populate_tag_msg - place a tag message in a buffer
1221  * @msg:        pointer to the area to place the tag
1222  * @cmd:        pointer to the scsi command for the tag
1223  *
1224  * Notes:
1225  *      designed to create the correct type of tag message for the
1226  *      particular request.  Returns the size of the tag message.
1227  *      May return 0 if TCQ is disabled for this device.
1228  **/
1229 int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd)
1230 {
1231         if (cmd->flags & SCMD_TAGGED) {
1232                 *msg++ = SIMPLE_QUEUE_TAG;
1233                 *msg++ = scsi_cmd_to_rq(cmd)->tag;
1234                 return 2;
1235         }
1236
1237         return 0;
1238 }
1239 EXPORT_SYMBOL_GPL(spi_populate_tag_msg);
1240
1241 #ifdef CONFIG_SCSI_CONSTANTS
1242 static const char * const one_byte_msgs[] = {
1243 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1244 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error",
1245 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1246 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1247 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set",
1248 /* 0x0f */ "Initiate Recovery", "Release Recovery",
1249 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1250 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1251 };
1252
1253 static const char * const two_byte_msgs[] = {
1254 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1255 /* 0x23 */ "Ignore Wide Residue", "ACA"
1256 };
1257
1258 static const char * const extended_msgs[] = {
1259 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1260 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1261 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1262 };
1263
1264 static void print_nego(const unsigned char *msg, int per, int off, int width)
1265 {
1266         if (per) {
1267                 char buf[20];
1268                 period_to_str(buf, msg[per]);
1269                 printk("period = %s ns ", buf);
1270         }
1271
1272         if (off)
1273                 printk("offset = %d ", msg[off]);
1274         if (width)
1275                 printk("width = %d ", 8 << msg[width]);
1276 }
1277
1278 static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1279 {
1280         int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1281                         msg[msb+3];
1282         printk("%s = %d ", desc, ptr);
1283 }
1284
1285 int spi_print_msg(const unsigned char *msg)
1286 {
1287         int len = 1, i;
1288         if (msg[0] == EXTENDED_MESSAGE) {
1289                 len = 2 + msg[1];
1290                 if (len == 2)
1291                         len += 256;
1292                 if (msg[2] < ARRAY_SIZE(extended_msgs))
1293                         printk ("%s ", extended_msgs[msg[2]]);
1294                 else
1295                         printk ("Extended Message, reserved code (0x%02x) ",
1296                                 (int) msg[2]);
1297                 switch (msg[2]) {
1298                 case EXTENDED_MODIFY_DATA_POINTER:
1299                         print_ptr(msg, 3, "pointer");
1300                         break;
1301                 case EXTENDED_SDTR:
1302                         print_nego(msg, 3, 4, 0);
1303                         break;
1304                 case EXTENDED_WDTR:
1305                         print_nego(msg, 0, 0, 3);
1306                         break;
1307                 case EXTENDED_PPR:
1308                         print_nego(msg, 3, 5, 6);
1309                         break;
1310                 case EXTENDED_MODIFY_BIDI_DATA_PTR:
1311                         print_ptr(msg, 3, "out");
1312                         print_ptr(msg, 7, "in");
1313                         break;
1314                 default:
1315                 for (i = 2; i < len; ++i)
1316                         printk("%02x ", msg[i]);
1317                 }
1318         /* Identify */
1319         } else if (msg[0] & 0x80) {
1320                 printk("Identify disconnect %sallowed %s %d ",
1321                         (msg[0] & 0x40) ? "" : "not ",
1322                         (msg[0] & 0x20) ? "target routine" : "lun",
1323                         msg[0] & 0x7);
1324         /* Normal One byte */
1325         } else if (msg[0] < 0x1f) {
1326                 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1327                         printk("%s ", one_byte_msgs[msg[0]]);
1328                 else
1329                         printk("reserved (%02x) ", msg[0]);
1330         } else if (msg[0] == 0x55) {
1331                 printk("QAS Request ");
1332         /* Two byte */
1333         } else if (msg[0] <= 0x2f) {
1334                 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1335                         printk("%s %02x ", two_byte_msgs[msg[0] - 0x20],
1336                                 msg[1]);
1337                 else
1338                         printk("reserved two byte (%02x %02x) ",
1339                                 msg[0], msg[1]);
1340                 len = 2;
1341         } else
1342                 printk("reserved ");
1343         return len;
1344 }
1345 EXPORT_SYMBOL(spi_print_msg);
1346
1347 #else  /* ifndef CONFIG_SCSI_CONSTANTS */
1348
1349 int spi_print_msg(const unsigned char *msg)
1350 {
1351         int len = 1, i;
1352
1353         if (msg[0] == EXTENDED_MESSAGE) {
1354                 len = 2 + msg[1];
1355                 if (len == 2)
1356                         len += 256;
1357                 for (i = 0; i < len; ++i)
1358                         printk("%02x ", msg[i]);
1359         /* Identify */
1360         } else if (msg[0] & 0x80) {
1361                 printk("%02x ", msg[0]);
1362         /* Normal One byte */
1363         } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1364                 printk("%02x ", msg[0]);
1365         /* Two byte */
1366         } else if (msg[0] <= 0x2f) {
1367                 printk("%02x %02x", msg[0], msg[1]);
1368                 len = 2;
1369         } else
1370                 printk("%02x ", msg[0]);
1371         return len;
1372 }
1373 EXPORT_SYMBOL(spi_print_msg);
1374 #endif /* ! CONFIG_SCSI_CONSTANTS */
1375
1376 static int spi_device_match(struct attribute_container *cont,
1377                             struct device *dev)
1378 {
1379         struct scsi_device *sdev;
1380         struct Scsi_Host *shost;
1381         struct spi_internal *i;
1382
1383         if (!scsi_is_sdev_device(dev))
1384                 return 0;
1385
1386         sdev = to_scsi_device(dev);
1387         shost = sdev->host;
1388         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1389             != &spi_host_class.class)
1390                 return 0;
1391         /* Note: this class has no device attributes, so it has
1392          * no per-HBA allocation and thus we don't need to distinguish
1393          * the attribute containers for the device */
1394         i = to_spi_internal(shost->transportt);
1395         if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1396                 return 0;
1397         return 1;
1398 }
1399
1400 static int spi_target_match(struct attribute_container *cont,
1401                             struct device *dev)
1402 {
1403         struct Scsi_Host *shost;
1404         struct scsi_target *starget;
1405         struct spi_internal *i;
1406
1407         if (!scsi_is_target_device(dev))
1408                 return 0;
1409
1410         shost = dev_to_shost(dev->parent);
1411         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1412             != &spi_host_class.class)
1413                 return 0;
1414
1415         i = to_spi_internal(shost->transportt);
1416         starget = to_scsi_target(dev);
1417
1418         if (i->f->deny_binding && i->f->deny_binding(starget))
1419                 return 0;
1420
1421         return &i->t.target_attrs.ac == cont;
1422 }
1423
1424 static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1425                                "spi_transport",
1426                                spi_setup_transport_attrs,
1427                                NULL,
1428                                spi_target_configure);
1429
1430 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1431                                     spi_device_match,
1432                                     spi_device_configure);
1433
1434 static struct attribute *host_attributes[] = {
1435         &dev_attr_signalling.attr,
1436         &dev_attr_host_width.attr,
1437         &dev_attr_hba_id.attr,
1438         NULL
1439 };
1440
1441 static struct attribute_group host_attribute_group = {
1442         .attrs = host_attributes,
1443 };
1444
1445 static int spi_host_configure(struct transport_container *tc,
1446                               struct device *dev,
1447                               struct device *cdev)
1448 {
1449         struct kobject *kobj = &cdev->kobj;
1450         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1451         struct spi_internal *si = to_spi_internal(shost->transportt);
1452         struct attribute *attr = &dev_attr_signalling.attr;
1453         int rc = 0;
1454
1455         if (si->f->set_signalling)
1456                 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1457
1458         return rc;
1459 }
1460
1461 /* returns true if we should be showing the variable.  Also
1462  * overloads the return by setting 1<<1 if the attribute should
1463  * be writeable */
1464 #define TARGET_ATTRIBUTE_HELPER(name) \
1465         (si->f->show_##name ? S_IRUGO : 0) | \
1466         (si->f->set_##name ? S_IWUSR : 0)
1467
1468 static umode_t target_attribute_is_visible(struct kobject *kobj,
1469                                           struct attribute *attr, int i)
1470 {
1471         struct device *cdev = container_of(kobj, struct device, kobj);
1472         struct scsi_target *starget = transport_class_to_starget(cdev);
1473         struct Scsi_Host *shost = transport_class_to_shost(cdev);
1474         struct spi_internal *si = to_spi_internal(shost->transportt);
1475
1476         if (attr == &dev_attr_period.attr &&
1477             spi_support_sync(starget))
1478                 return TARGET_ATTRIBUTE_HELPER(period);
1479         else if (attr == &dev_attr_min_period.attr &&
1480                  spi_support_sync(starget))
1481                 return TARGET_ATTRIBUTE_HELPER(period);
1482         else if (attr == &dev_attr_offset.attr &&
1483                  spi_support_sync(starget))
1484                 return TARGET_ATTRIBUTE_HELPER(offset);
1485         else if (attr == &dev_attr_max_offset.attr &&
1486                  spi_support_sync(starget))
1487                 return TARGET_ATTRIBUTE_HELPER(offset);
1488         else if (attr == &dev_attr_width.attr &&
1489                  spi_support_wide(starget))
1490                 return TARGET_ATTRIBUTE_HELPER(width);
1491         else if (attr == &dev_attr_max_width.attr &&
1492                  spi_support_wide(starget))
1493                 return TARGET_ATTRIBUTE_HELPER(width);
1494         else if (attr == &dev_attr_iu.attr &&
1495                  spi_support_ius(starget))
1496                 return TARGET_ATTRIBUTE_HELPER(iu);
1497         else if (attr == &dev_attr_max_iu.attr &&
1498                  spi_support_ius(starget))
1499                 return TARGET_ATTRIBUTE_HELPER(iu);
1500         else if (attr == &dev_attr_dt.attr &&
1501                  spi_support_dt(starget))
1502                 return TARGET_ATTRIBUTE_HELPER(dt);
1503         else if (attr == &dev_attr_qas.attr &&
1504                  spi_support_qas(starget))
1505                 return TARGET_ATTRIBUTE_HELPER(qas);
1506         else if (attr == &dev_attr_max_qas.attr &&
1507                  spi_support_qas(starget))
1508                 return TARGET_ATTRIBUTE_HELPER(qas);
1509         else if (attr == &dev_attr_wr_flow.attr &&
1510                  spi_support_ius(starget))
1511                 return TARGET_ATTRIBUTE_HELPER(wr_flow);
1512         else if (attr == &dev_attr_rd_strm.attr &&
1513                  spi_support_ius(starget))
1514                 return TARGET_ATTRIBUTE_HELPER(rd_strm);
1515         else if (attr == &dev_attr_rti.attr &&
1516                  spi_support_ius(starget))
1517                 return TARGET_ATTRIBUTE_HELPER(rti);
1518         else if (attr == &dev_attr_pcomp_en.attr &&
1519                  spi_support_ius(starget))
1520                 return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1521         else if (attr == &dev_attr_hold_mcs.attr &&
1522                  spi_support_ius(starget))
1523                 return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1524         else if (attr == &dev_attr_revalidate.attr)
1525                 return S_IWUSR;
1526
1527         return 0;
1528 }
1529
1530 static struct attribute *target_attributes[] = {
1531         &dev_attr_period.attr,
1532         &dev_attr_min_period.attr,
1533         &dev_attr_offset.attr,
1534         &dev_attr_max_offset.attr,
1535         &dev_attr_width.attr,
1536         &dev_attr_max_width.attr,
1537         &dev_attr_iu.attr,
1538         &dev_attr_max_iu.attr,
1539         &dev_attr_dt.attr,
1540         &dev_attr_qas.attr,
1541         &dev_attr_max_qas.attr,
1542         &dev_attr_wr_flow.attr,
1543         &dev_attr_rd_strm.attr,
1544         &dev_attr_rti.attr,
1545         &dev_attr_pcomp_en.attr,
1546         &dev_attr_hold_mcs.attr,
1547         &dev_attr_revalidate.attr,
1548         NULL
1549 };
1550
1551 static struct attribute_group target_attribute_group = {
1552         .attrs = target_attributes,
1553         .is_visible = target_attribute_is_visible,
1554 };
1555
1556 static int spi_target_configure(struct transport_container *tc,
1557                                 struct device *dev,
1558                                 struct device *cdev)
1559 {
1560         struct kobject *kobj = &cdev->kobj;
1561
1562         /* force an update based on parameters read from the device */
1563         sysfs_update_group(kobj, &target_attribute_group);
1564
1565         return 0;
1566 }
1567
1568 struct scsi_transport_template *
1569 spi_attach_transport(struct spi_function_template *ft)
1570 {
1571         struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1572                                          GFP_KERNEL);
1573
1574         if (unlikely(!i))
1575                 return NULL;
1576
1577         i->t.target_attrs.ac.class = &spi_transport_class.class;
1578         i->t.target_attrs.ac.grp = &target_attribute_group;
1579         i->t.target_attrs.ac.match = spi_target_match;
1580         transport_container_register(&i->t.target_attrs);
1581         i->t.target_size = sizeof(struct spi_transport_attrs);
1582         i->t.host_attrs.ac.class = &spi_host_class.class;
1583         i->t.host_attrs.ac.grp = &host_attribute_group;
1584         i->t.host_attrs.ac.match = spi_host_match;
1585         transport_container_register(&i->t.host_attrs);
1586         i->t.host_size = sizeof(struct spi_host_attrs);
1587         i->f = ft;
1588
1589         return &i->t;
1590 }
1591 EXPORT_SYMBOL(spi_attach_transport);
1592
1593 void spi_release_transport(struct scsi_transport_template *t)
1594 {
1595         struct spi_internal *i = to_spi_internal(t);
1596
1597         transport_container_unregister(&i->t.target_attrs);
1598         transport_container_unregister(&i->t.host_attrs);
1599
1600         kfree(i);
1601 }
1602 EXPORT_SYMBOL(spi_release_transport);
1603
1604 static __init int spi_transport_init(void)
1605 {
1606         int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1607                                            "SCSI Parallel Transport Class");
1608         if (!error) {
1609                 int i;
1610
1611                 for (i = 0; spi_static_device_list[i].vendor; i++)
1612                         scsi_dev_info_list_add_keyed(1, /* compatible */
1613                                                      spi_static_device_list[i].vendor,
1614                                                      spi_static_device_list[i].model,
1615                                                      NULL,
1616                                                      spi_static_device_list[i].flags,
1617                                                      SCSI_DEVINFO_SPI);
1618         }
1619
1620         error = transport_class_register(&spi_transport_class);
1621         if (error)
1622                 return error;
1623         error = anon_transport_class_register(&spi_device_class);
1624         return transport_class_register(&spi_host_class);
1625 }
1626
1627 static void __exit spi_transport_exit(void)
1628 {
1629         transport_class_unregister(&spi_transport_class);
1630         anon_transport_class_unregister(&spi_device_class);
1631         transport_class_unregister(&spi_host_class);
1632         scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1633 }
1634
1635 MODULE_AUTHOR("Martin Hicks");
1636 MODULE_DESCRIPTION("SPI Transport Attributes");
1637 MODULE_LICENSE("GPL");
1638
1639 module_init(spi_transport_init);
1640 module_exit(spi_transport_exit);