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