linux/drivers/scsi/scsi_transport_spi.c
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   1/* 
   2 *  Parallel SCSI (SPI) transport specific attributes exported to sysfs.
   3 *
   4 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5 *  Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com>
   6 *
   7 *  This program is free software; you can redistribute it and/or modify
   8 *  it under the terms of the GNU General Public License as published by
   9 *  the Free Software Foundation; either version 2 of the License, or
  10 *  (at your option) any later version.
  11 *
  12 *  This program is distributed in the hope that it will be useful,
  13 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 *  GNU General Public License for more details.
  16 *
  17 *  You should have received a copy of the GNU General Public License
  18 *  along with this program; if not, write to the Free Software
  19 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20 */
  21#include <linux/ctype.h>
  22#include <linux/init.h>
  23#include <linux/module.h>
  24#include <linux/workqueue.h>
  25#include <linux/blkdev.h>
  26#include <linux/mutex.h>
  27#include <linux/sysfs.h>
  28#include <linux/slab.h>
  29#include <scsi/scsi.h>
  30#include "scsi_priv.h"
  31#include <scsi/scsi_device.h>
  32#include <scsi/scsi_host.h>
  33#include <scsi/scsi_cmnd.h>
  34#include <scsi/scsi_eh.h>
  35#include <scsi/scsi_transport.h>
  36#include <scsi/scsi_transport_spi.h>
  37
  38#define SPI_NUM_ATTRS 14        /* increase this if you add attributes */
  39#define SPI_OTHER_ATTRS 1       /* Increase this if you add "always
  40                                 * on" attributes */
  41#define SPI_HOST_ATTRS  1
  42
  43#define SPI_MAX_ECHO_BUFFER_SIZE        4096
  44
  45#define DV_LOOPS        3
  46#define DV_TIMEOUT      (10*HZ)
  47#define DV_RETRIES      3       /* should only need at most 
  48                                 * two cc/ua clears */
  49
  50/* Our blacklist flags */
  51enum {
  52        SPI_BLIST_NOIUS = 0x1,
  53};
  54
  55/* blacklist table, modelled on scsi_devinfo.c */
  56static struct {
  57        char *vendor;
  58        char *model;
  59        unsigned flags;
  60} spi_static_device_list[] __initdata = {
  61        {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS },
  62        {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS },
  63        {NULL, NULL, 0}
  64};
  65
  66/* Private data accessors (keep these out of the header file) */
  67#define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress)
  68#define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex)
  69
  70struct spi_internal {
  71        struct scsi_transport_template t;
  72        struct spi_function_template *f;
  73};
  74
  75#define to_spi_internal(tmpl)   container_of(tmpl, struct spi_internal, t)
  76
  77static const int ppr_to_ps[] = {
  78        /* The PPR values 0-6 are reserved, fill them in when
  79         * the committee defines them */
  80        -1,                     /* 0x00 */
  81        -1,                     /* 0x01 */
  82        -1,                     /* 0x02 */
  83        -1,                     /* 0x03 */
  84        -1,                     /* 0x04 */
  85        -1,                     /* 0x05 */
  86        -1,                     /* 0x06 */
  87         3125,                  /* 0x07 */
  88         6250,                  /* 0x08 */
  89        12500,                  /* 0x09 */
  90        25000,                  /* 0x0a */
  91        30300,                  /* 0x0b */
  92        50000,                  /* 0x0c */
  93};
  94/* The PPR values at which you calculate the period in ns by multiplying
  95 * by 4 */
  96#define SPI_STATIC_PPR  0x0c
  97
  98static int sprint_frac(char *dest, int value, int denom)
  99{
 100        int frac = value % denom;
 101        int result = sprintf(dest, "%d", value / denom);
 102
 103        if (frac == 0)
 104                return result;
 105        dest[result++] = '.';
 106
 107        do {
 108                denom /= 10;
 109                sprintf(dest + result, "%d", frac / denom);
 110                result++;
 111                frac %= denom;
 112        } while (frac);
 113
 114        dest[result++] = '\0';
 115        return result;
 116}
 117
 118static int spi_execute(struct scsi_device *sdev, const void *cmd,
 119                       enum dma_data_direction dir,
 120                       void *buffer, unsigned bufflen,
 121                       struct scsi_sense_hdr *sshdr)
 122{
 123        int i, result;
 124        unsigned char sense[SCSI_SENSE_BUFFERSIZE];
 125
 126        for(i = 0; i < DV_RETRIES; i++) {
 127                result = scsi_execute(sdev, cmd, dir, buffer, bufflen,
 128                                      sense, DV_TIMEOUT, /* retries */ 1,
 129                                      REQ_FAILFAST_DEV |
 130                                      REQ_FAILFAST_TRANSPORT |
 131                                      REQ_FAILFAST_DRIVER,
 132                                      NULL);
 133                if (driver_byte(result) & DRIVER_SENSE) {
 134                        struct scsi_sense_hdr sshdr_tmp;
 135                        if (!sshdr)
 136                                sshdr = &sshdr_tmp;
 137
 138                        if (scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE,
 139                                                 sshdr)
 140                            && sshdr->sense_key == UNIT_ATTENTION)
 141                                continue;
 142                }
 143                break;
 144        }
 145        return result;
 146}
 147
 148static struct {
 149        enum spi_signal_type    value;
 150        char                    *name;
 151} signal_types[] = {
 152        { SPI_SIGNAL_UNKNOWN, "unknown" },
 153        { SPI_SIGNAL_SE, "SE" },
 154        { SPI_SIGNAL_LVD, "LVD" },
 155        { SPI_SIGNAL_HVD, "HVD" },
 156};
 157
 158static inline const char *spi_signal_to_string(enum spi_signal_type type)
 159{
 160        int i;
 161
 162        for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 163                if (type == signal_types[i].value)
 164                        return signal_types[i].name;
 165        }
 166        return NULL;
 167}
 168static inline enum spi_signal_type spi_signal_to_value(const char *name)
 169{
 170        int i, len;
 171
 172        for (i = 0; i < ARRAY_SIZE(signal_types); i++) {
 173                len =  strlen(signal_types[i].name);
 174                if (strncmp(name, signal_types[i].name, len) == 0 &&
 175                    (name[len] == '\n' || name[len] == '\0'))
 176                        return signal_types[i].value;
 177        }
 178        return SPI_SIGNAL_UNKNOWN;
 179}
 180
 181static int spi_host_setup(struct transport_container *tc, struct device *dev,
 182                          struct device *cdev)
 183{
 184        struct Scsi_Host *shost = dev_to_shost(dev);
 185
 186        spi_signalling(shost) = SPI_SIGNAL_UNKNOWN;
 187
 188        return 0;
 189}
 190
 191static int spi_host_configure(struct transport_container *tc,
 192                              struct device *dev,
 193                              struct device *cdev);
 194
 195static DECLARE_TRANSPORT_CLASS(spi_host_class,
 196                               "spi_host",
 197                               spi_host_setup,
 198                               NULL,
 199                               spi_host_configure);
 200
 201static int spi_host_match(struct attribute_container *cont,
 202                          struct device *dev)
 203{
 204        struct Scsi_Host *shost;
 205
 206        if (!scsi_is_host_device(dev))
 207                return 0;
 208
 209        shost = dev_to_shost(dev);
 210        if (!shost->transportt  || shost->transportt->host_attrs.ac.class
 211            != &spi_host_class.class)
 212                return 0;
 213
 214        return &shost->transportt->host_attrs.ac == cont;
 215}
 216
 217static int spi_target_configure(struct transport_container *tc,
 218                                struct device *dev,
 219                                struct device *cdev);
 220
 221static int spi_device_configure(struct transport_container *tc,
 222                                struct device *dev,
 223                                struct device *cdev)
 224{
 225        struct scsi_device *sdev = to_scsi_device(dev);
 226        struct scsi_target *starget = sdev->sdev_target;
 227        unsigned bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8],
 228                                                      &sdev->inquiry[16],
 229                                                      SCSI_DEVINFO_SPI);
 230
 231        /* Populate the target capability fields with the values
 232         * gleaned from the device inquiry */
 233
 234        spi_support_sync(starget) = scsi_device_sync(sdev);
 235        spi_support_wide(starget) = scsi_device_wide(sdev);
 236        spi_support_dt(starget) = scsi_device_dt(sdev);
 237        spi_support_dt_only(starget) = scsi_device_dt_only(sdev);
 238        spi_support_ius(starget) = scsi_device_ius(sdev);
 239        if (bflags & SPI_BLIST_NOIUS) {
 240                dev_info(dev, "Information Units disabled by blacklist\n");
 241                spi_support_ius(starget) = 0;
 242        }
 243        spi_support_qas(starget) = scsi_device_qas(sdev);
 244
 245        return 0;
 246}
 247
 248static int spi_setup_transport_attrs(struct transport_container *tc,
 249                                     struct device *dev,
 250                                     struct device *cdev)
 251{
 252        struct scsi_target *starget = to_scsi_target(dev);
 253
 254        spi_period(starget) = -1;       /* illegal value */
 255        spi_min_period(starget) = 0;
 256        spi_offset(starget) = 0;        /* async */
 257        spi_max_offset(starget) = 255;
 258        spi_width(starget) = 0; /* narrow */
 259        spi_max_width(starget) = 1;
 260        spi_iu(starget) = 0;    /* no IU */
 261        spi_max_iu(starget) = 1;
 262        spi_dt(starget) = 0;    /* ST */
 263        spi_qas(starget) = 0;
 264        spi_max_qas(starget) = 1;
 265        spi_wr_flow(starget) = 0;
 266        spi_rd_strm(starget) = 0;
 267        spi_rti(starget) = 0;
 268        spi_pcomp_en(starget) = 0;
 269        spi_hold_mcs(starget) = 0;
 270        spi_dv_pending(starget) = 0;
 271        spi_dv_in_progress(starget) = 0;
 272        spi_initial_dv(starget) = 0;
 273        mutex_init(&spi_dv_mutex(starget));
 274
 275        return 0;
 276}
 277
 278#define spi_transport_show_simple(field, format_string)                 \
 279                                                                        \
 280static ssize_t                                                          \
 281show_spi_transport_##field(struct device *dev,                  \
 282                           struct device_attribute *attr, char *buf)    \
 283{                                                                       \
 284        struct scsi_target *starget = transport_class_to_starget(dev);  \
 285        struct spi_transport_attrs *tp;                                 \
 286                                                                        \
 287        tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 288        return snprintf(buf, 20, format_string, tp->field);             \
 289}
 290
 291#define spi_transport_store_simple(field, format_string)                \
 292                                                                        \
 293static ssize_t                                                          \
 294store_spi_transport_##field(struct device *dev,                         \
 295                            struct device_attribute *attr,              \
 296                            const char *buf, size_t count)              \
 297{                                                                       \
 298        int val;                                                        \
 299        struct scsi_target *starget = transport_class_to_starget(dev);  \
 300        struct spi_transport_attrs *tp;                                 \
 301                                                                        \
 302        tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 303        val = simple_strtoul(buf, NULL, 0);                             \
 304        tp->field = val;                                                \
 305        return count;                                                   \
 306}
 307
 308#define spi_transport_show_function(field, format_string)               \
 309                                                                        \
 310static ssize_t                                                          \
 311show_spi_transport_##field(struct device *dev,                  \
 312                           struct device_attribute *attr, char *buf)    \
 313{                                                                       \
 314        struct scsi_target *starget = transport_class_to_starget(dev);  \
 315        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 316        struct spi_transport_attrs *tp;                                 \
 317        struct spi_internal *i = to_spi_internal(shost->transportt);    \
 318        tp = (struct spi_transport_attrs *)&starget->starget_data;      \
 319        if (i->f->get_##field)                                          \
 320                i->f->get_##field(starget);                             \
 321        return snprintf(buf, 20, format_string, tp->field);             \
 322}
 323
 324#define spi_transport_store_function(field, format_string)              \
 325static ssize_t                                                          \
 326store_spi_transport_##field(struct device *dev,                         \
 327                            struct device_attribute *attr,              \
 328                            const char *buf, size_t count)              \
 329{                                                                       \
 330        int val;                                                        \
 331        struct scsi_target *starget = transport_class_to_starget(dev);  \
 332        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 333        struct spi_internal *i = to_spi_internal(shost->transportt);    \
 334                                                                        \
 335        if (!i->f->set_##field)                                         \
 336                return -EINVAL;                                         \
 337        val = simple_strtoul(buf, NULL, 0);                             \
 338        i->f->set_##field(starget, val);                                \
 339        return count;                                                   \
 340}
 341
 342#define spi_transport_store_max(field, format_string)                   \
 343static ssize_t                                                          \
 344store_spi_transport_##field(struct device *dev,                         \
 345                            struct device_attribute *attr,              \
 346                            const char *buf, size_t count)              \
 347{                                                                       \
 348        int val;                                                        \
 349        struct scsi_target *starget = transport_class_to_starget(dev);  \
 350        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
 351        struct spi_internal *i = to_spi_internal(shost->transportt);    \
 352        struct spi_transport_attrs *tp                                  \
 353                = (struct spi_transport_attrs *)&starget->starget_data; \
 354                                                                        \
 355        if (i->f->set_##field)                                          \
 356                return -EINVAL;                                         \
 357        val = simple_strtoul(buf, NULL, 0);                             \
 358        if (val > tp->max_##field)                                      \
 359                val = tp->max_##field;                                  \
 360        i->f->set_##field(starget, val);                                \
 361        return count;                                                   \
 362}
 363
 364#define spi_transport_rd_attr(field, format_string)                     \
 365        spi_transport_show_function(field, format_string)               \
 366        spi_transport_store_function(field, format_string)              \
 367static DEVICE_ATTR(field, S_IRUGO,                              \
 368                   show_spi_transport_##field,                  \
 369                   store_spi_transport_##field);
 370
 371#define spi_transport_simple_attr(field, format_string)                 \
 372        spi_transport_show_simple(field, format_string)                 \
 373        spi_transport_store_simple(field, format_string)                \
 374static DEVICE_ATTR(field, S_IRUGO,                              \
 375                   show_spi_transport_##field,                  \
 376                   store_spi_transport_##field);
 377
 378#define spi_transport_max_attr(field, format_string)                    \
 379        spi_transport_show_function(field, format_string)               \
 380        spi_transport_store_max(field, format_string)                   \
 381        spi_transport_simple_attr(max_##field, format_string)           \
 382static DEVICE_ATTR(field, S_IRUGO,                              \
 383                   show_spi_transport_##field,                  \
 384                   store_spi_transport_##field);
 385
 386/* The Parallel SCSI Tranport Attributes: */
 387spi_transport_max_attr(offset, "%d\n");
 388spi_transport_max_attr(width, "%d\n");
 389spi_transport_max_attr(iu, "%d\n");
 390spi_transport_rd_attr(dt, "%d\n");
 391spi_transport_max_attr(qas, "%d\n");
 392spi_transport_rd_attr(wr_flow, "%d\n");
 393spi_transport_rd_attr(rd_strm, "%d\n");
 394spi_transport_rd_attr(rti, "%d\n");
 395spi_transport_rd_attr(pcomp_en, "%d\n");
 396spi_transport_rd_attr(hold_mcs, "%d\n");
 397
 398/* we only care about the first child device that's a real SCSI device
 399 * so we return 1 to terminate the iteration when we find it */
 400static int child_iter(struct device *dev, void *data)
 401{
 402        if (!scsi_is_sdev_device(dev))
 403                return 0;
 404
 405        spi_dv_device(to_scsi_device(dev));
 406        return 1;
 407}
 408
 409static ssize_t
 410store_spi_revalidate(struct device *dev, struct device_attribute *attr,
 411                     const char *buf, size_t count)
 412{
 413        struct scsi_target *starget = transport_class_to_starget(dev);
 414
 415        device_for_each_child(&starget->dev, NULL, child_iter);
 416        return count;
 417}
 418static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate);
 419
 420/* Translate the period into ns according to the current spec
 421 * for SDTR/PPR messages */
 422static int period_to_str(char *buf, int period)
 423{
 424        int len, picosec;
 425
 426        if (period < 0 || period > 0xff) {
 427                picosec = -1;
 428        } else if (period <= SPI_STATIC_PPR) {
 429                picosec = ppr_to_ps[period];
 430        } else {
 431                picosec = period * 4000;
 432        }
 433
 434        if (picosec == -1) {
 435                len = sprintf(buf, "reserved");
 436        } else {
 437                len = sprint_frac(buf, picosec, 1000);
 438        }
 439
 440        return len;
 441}
 442
 443static ssize_t
 444show_spi_transport_period_helper(char *buf, int period)
 445{
 446        int len = period_to_str(buf, period);
 447        buf[len++] = '\n';
 448        buf[len] = '\0';
 449        return len;
 450}
 451
 452static ssize_t
 453store_spi_transport_period_helper(struct device *dev, const char *buf,
 454                                  size_t count, int *periodp)
 455{
 456        int j, picosec, period = -1;
 457        char *endp;
 458
 459        picosec = simple_strtoul(buf, &endp, 10) * 1000;
 460        if (*endp == '.') {
 461                int mult = 100;
 462                do {
 463                        endp++;
 464                        if (!isdigit(*endp))
 465                                break;
 466                        picosec += (*endp - '0') * mult;
 467                        mult /= 10;
 468                } while (mult > 0);
 469        }
 470
 471        for (j = 0; j <= SPI_STATIC_PPR; j++) {
 472                if (ppr_to_ps[j] < picosec)
 473                        continue;
 474                period = j;
 475                break;
 476        }
 477
 478        if (period == -1)
 479                period = picosec / 4000;
 480
 481        if (period > 0xff)
 482                period = 0xff;
 483
 484        *periodp = period;
 485
 486        return count;
 487}
 488
 489static ssize_t
 490show_spi_transport_period(struct device *dev,
 491                          struct device_attribute *attr, char *buf)
 492{
 493        struct scsi_target *starget = transport_class_to_starget(dev);
 494        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 495        struct spi_internal *i = to_spi_internal(shost->transportt);
 496        struct spi_transport_attrs *tp =
 497                (struct spi_transport_attrs *)&starget->starget_data;
 498
 499        if (i->f->get_period)
 500                i->f->get_period(starget);
 501
 502        return show_spi_transport_period_helper(buf, tp->period);
 503}
 504
 505static ssize_t
 506store_spi_transport_period(struct device *cdev, struct device_attribute *attr,
 507                           const char *buf, size_t count)
 508{
 509        struct scsi_target *starget = transport_class_to_starget(cdev);
 510        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 511        struct spi_internal *i = to_spi_internal(shost->transportt);
 512        struct spi_transport_attrs *tp =
 513                (struct spi_transport_attrs *)&starget->starget_data;
 514        int period, retval;
 515
 516        if (!i->f->set_period)
 517                return -EINVAL;
 518
 519        retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 520
 521        if (period < tp->min_period)
 522                period = tp->min_period;
 523
 524        i->f->set_period(starget, period);
 525
 526        return retval;
 527}
 528
 529static DEVICE_ATTR(period, S_IRUGO,
 530                   show_spi_transport_period,
 531                   store_spi_transport_period);
 532
 533static ssize_t
 534show_spi_transport_min_period(struct device *cdev,
 535                              struct device_attribute *attr, char *buf)
 536{
 537        struct scsi_target *starget = transport_class_to_starget(cdev);
 538        struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
 539        struct spi_internal *i = to_spi_internal(shost->transportt);
 540        struct spi_transport_attrs *tp =
 541                (struct spi_transport_attrs *)&starget->starget_data;
 542
 543        if (!i->f->set_period)
 544                return -EINVAL;
 545
 546        return show_spi_transport_period_helper(buf, tp->min_period);
 547}
 548
 549static ssize_t
 550store_spi_transport_min_period(struct device *cdev,
 551                               struct device_attribute *attr,
 552                               const char *buf, size_t count)
 553{
 554        struct scsi_target *starget = transport_class_to_starget(cdev);
 555        struct spi_transport_attrs *tp =
 556                (struct spi_transport_attrs *)&starget->starget_data;
 557
 558        return store_spi_transport_period_helper(cdev, buf, count,
 559                                                 &tp->min_period);
 560}
 561
 562
 563static DEVICE_ATTR(min_period, S_IRUGO,
 564                   show_spi_transport_min_period,
 565                   store_spi_transport_min_period);
 566
 567
 568static ssize_t show_spi_host_signalling(struct device *cdev,
 569                                        struct device_attribute *attr,
 570                                        char *buf)
 571{
 572        struct Scsi_Host *shost = transport_class_to_shost(cdev);
 573        struct spi_internal *i = to_spi_internal(shost->transportt);
 574
 575        if (i->f->get_signalling)
 576                i->f->get_signalling(shost);
 577
 578        return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost)));
 579}
 580static ssize_t store_spi_host_signalling(struct device *dev,
 581                                         struct device_attribute *attr,
 582                                         const char *buf, size_t count)
 583{
 584        struct Scsi_Host *shost = transport_class_to_shost(dev);
 585        struct spi_internal *i = to_spi_internal(shost->transportt);
 586        enum spi_signal_type type = spi_signal_to_value(buf);
 587
 588        if (!i->f->set_signalling)
 589                return -EINVAL;
 590
 591        if (type != SPI_SIGNAL_UNKNOWN)
 592                i->f->set_signalling(shost, type);
 593
 594        return count;
 595}
 596static DEVICE_ATTR(signalling, S_IRUGO,
 597                   show_spi_host_signalling,
 598                   store_spi_host_signalling);
 599
 600static ssize_t show_spi_host_width(struct device *cdev,
 601                                      struct device_attribute *attr,
 602                                      char *buf)
 603{
 604        struct Scsi_Host *shost = transport_class_to_shost(cdev);
 605
 606        return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow");
 607}
 608static DEVICE_ATTR(host_width, S_IRUGO,
 609                   show_spi_host_width, NULL);
 610
 611static ssize_t show_spi_host_hba_id(struct device *cdev,
 612                                    struct device_attribute *attr,
 613                                    char *buf)
 614{
 615        struct Scsi_Host *shost = transport_class_to_shost(cdev);
 616
 617        return sprintf(buf, "%d\n", shost->this_id);
 618}
 619static DEVICE_ATTR(hba_id, S_IRUGO,
 620                   show_spi_host_hba_id, NULL);
 621
 622#define DV_SET(x, y)                    \
 623        if(i->f->set_##x)               \
 624                i->f->set_##x(sdev->sdev_target, y)
 625
 626enum spi_compare_returns {
 627        SPI_COMPARE_SUCCESS,
 628        SPI_COMPARE_FAILURE,
 629        SPI_COMPARE_SKIP_TEST,
 630};
 631
 632
 633/* This is for read/write Domain Validation:  If the device supports
 634 * an echo buffer, we do read/write tests to it */
 635static enum spi_compare_returns
 636spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer,
 637                          u8 *ptr, const int retries)
 638{
 639        int len = ptr - buffer;
 640        int j, k, r, result;
 641        unsigned int pattern = 0x0000ffff;
 642        struct scsi_sense_hdr sshdr;
 643
 644        const char spi_write_buffer[] = {
 645                WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 646        };
 647        const char spi_read_buffer[] = {
 648                READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0
 649        };
 650
 651        /* set up the pattern buffer.  Doesn't matter if we spill
 652         * slightly beyond since that's where the read buffer is */
 653        for (j = 0; j < len; ) {
 654
 655                /* fill the buffer with counting (test a) */
 656                for ( ; j < min(len, 32); j++)
 657                        buffer[j] = j;
 658                k = j;
 659                /* fill the buffer with alternating words of 0x0 and
 660                 * 0xffff (test b) */
 661                for ( ; j < min(len, k + 32); j += 2) {
 662                        u16 *word = (u16 *)&buffer[j];
 663                        
 664                        *word = (j & 0x02) ? 0x0000 : 0xffff;
 665                }
 666                k = j;
 667                /* fill with crosstalk (alternating 0x5555 0xaaa)
 668                 * (test c) */
 669                for ( ; j < min(len, k + 32); j += 2) {
 670                        u16 *word = (u16 *)&buffer[j];
 671
 672                        *word = (j & 0x02) ? 0x5555 : 0xaaaa;
 673                }
 674                k = j;
 675                /* fill with shifting bits (test d) */
 676                for ( ; j < min(len, k + 32); j += 4) {
 677                        u32 *word = (unsigned int *)&buffer[j];
 678                        u32 roll = (pattern & 0x80000000) ? 1 : 0;
 679                        
 680                        *word = pattern;
 681                        pattern = (pattern << 1) | roll;
 682                }
 683                /* don't bother with random data (test e) */
 684        }
 685
 686        for (r = 0; r < retries; r++) {
 687                result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE,
 688                                     buffer, len, &sshdr);
 689                if(result || !scsi_device_online(sdev)) {
 690
 691                        scsi_device_set_state(sdev, SDEV_QUIESCE);
 692                        if (scsi_sense_valid(&sshdr)
 693                            && sshdr.sense_key == ILLEGAL_REQUEST
 694                            /* INVALID FIELD IN CDB */
 695                            && sshdr.asc == 0x24 && sshdr.ascq == 0x00)
 696                                /* This would mean that the drive lied
 697                                 * to us about supporting an echo
 698                                 * buffer (unfortunately some Western
 699                                 * Digital drives do precisely this)
 700                                 */
 701                                return SPI_COMPARE_SKIP_TEST;
 702
 703
 704                        sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result);
 705                        return SPI_COMPARE_FAILURE;
 706                }
 707
 708                memset(ptr, 0, len);
 709                spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE,
 710                            ptr, len, NULL);
 711                scsi_device_set_state(sdev, SDEV_QUIESCE);
 712
 713                if (memcmp(buffer, ptr, len) != 0)
 714                        return SPI_COMPARE_FAILURE;
 715        }
 716        return SPI_COMPARE_SUCCESS;
 717}
 718
 719/* This is for the simplest form of Domain Validation: a read test
 720 * on the inquiry data from the device */
 721static enum spi_compare_returns
 722spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer,
 723                              u8 *ptr, const int retries)
 724{
 725        int r, result;
 726        const int len = sdev->inquiry_len;
 727        const char spi_inquiry[] = {
 728                INQUIRY, 0, 0, 0, len, 0
 729        };
 730
 731        for (r = 0; r < retries; r++) {
 732                memset(ptr, 0, len);
 733
 734                result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE,
 735                                     ptr, len, NULL);
 736                
 737                if(result || !scsi_device_online(sdev)) {
 738                        scsi_device_set_state(sdev, SDEV_QUIESCE);
 739                        return SPI_COMPARE_FAILURE;
 740                }
 741
 742                /* If we don't have the inquiry data already, the
 743                 * first read gets it */
 744                if (ptr == buffer) {
 745                        ptr += len;
 746                        --r;
 747                        continue;
 748                }
 749
 750                if (memcmp(buffer, ptr, len) != 0)
 751                        /* failure */
 752                        return SPI_COMPARE_FAILURE;
 753        }
 754        return SPI_COMPARE_SUCCESS;
 755}
 756
 757static enum spi_compare_returns
 758spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr,
 759               enum spi_compare_returns 
 760               (*compare_fn)(struct scsi_device *, u8 *, u8 *, int))
 761{
 762        struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 763        struct scsi_target *starget = sdev->sdev_target;
 764        int period = 0, prevperiod = 0; 
 765        enum spi_compare_returns retval;
 766
 767
 768        for (;;) {
 769                int newperiod;
 770                retval = compare_fn(sdev, buffer, ptr, DV_LOOPS);
 771
 772                if (retval == SPI_COMPARE_SUCCESS
 773                    || retval == SPI_COMPARE_SKIP_TEST)
 774                        break;
 775
 776                /* OK, retrain, fallback */
 777                if (i->f->get_iu)
 778                        i->f->get_iu(starget);
 779                if (i->f->get_qas)
 780                        i->f->get_qas(starget);
 781                if (i->f->get_period)
 782                        i->f->get_period(sdev->sdev_target);
 783
 784                /* Here's the fallback sequence; first try turning off
 785                 * IU, then QAS (if we can control them), then finally
 786                 * fall down the periods */
 787                if (i->f->set_iu && spi_iu(starget)) {
 788                        starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n");
 789                        DV_SET(iu, 0);
 790                } else if (i->f->set_qas && spi_qas(starget)) {
 791                        starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n");
 792                        DV_SET(qas, 0);
 793                } else {
 794                        newperiod = spi_period(starget);
 795                        period = newperiod > period ? newperiod : period;
 796                        if (period < 0x0d)
 797                                period++;
 798                        else
 799                                period += period >> 1;
 800
 801                        if (unlikely(period > 0xff || period == prevperiod)) {
 802                                /* Total failure; set to async and return */
 803                                starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n");
 804                                DV_SET(offset, 0);
 805                                return SPI_COMPARE_FAILURE;
 806                        }
 807                        starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n");
 808                        DV_SET(period, period);
 809                        prevperiod = period;
 810                }
 811        }
 812        return retval;
 813}
 814
 815static int
 816spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer)
 817{
 818        int l, result;
 819
 820        /* first off do a test unit ready.  This can error out 
 821         * because of reservations or some other reason.  If it
 822         * fails, the device won't let us write to the echo buffer
 823         * so just return failure */
 824        
 825        const char spi_test_unit_ready[] = {
 826                TEST_UNIT_READY, 0, 0, 0, 0, 0
 827        };
 828
 829        const char spi_read_buffer_descriptor[] = {
 830                READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0
 831        };
 832
 833        
 834        /* We send a set of three TURs to clear any outstanding 
 835         * unit attention conditions if they exist (Otherwise the
 836         * buffer tests won't be happy).  If the TUR still fails
 837         * (reservation conflict, device not ready, etc) just
 838         * skip the write tests */
 839        for (l = 0; ; l++) {
 840                result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 
 841                                     NULL, 0, NULL);
 842
 843                if(result) {
 844                        if(l >= 3)
 845                                return 0;
 846                } else {
 847                        /* TUR succeeded */
 848                        break;
 849                }
 850        }
 851
 852        result = spi_execute(sdev, spi_read_buffer_descriptor, 
 853                             DMA_FROM_DEVICE, buffer, 4, NULL);
 854
 855        if (result)
 856                /* Device has no echo buffer */
 857                return 0;
 858
 859        return buffer[3] + ((buffer[2] & 0x1f) << 8);
 860}
 861
 862static void
 863spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 864{
 865        struct spi_internal *i = to_spi_internal(sdev->host->transportt);
 866        struct scsi_target *starget = sdev->sdev_target;
 867        struct Scsi_Host *shost = sdev->host;
 868        int len = sdev->inquiry_len;
 869        int min_period = spi_min_period(starget);
 870        int max_width = spi_max_width(starget);
 871        /* first set us up for narrow async */
 872        DV_SET(offset, 0);
 873        DV_SET(width, 0);
 874
 875        if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS)
 876            != SPI_COMPARE_SUCCESS) {
 877                starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n");
 878                /* FIXME: should probably offline the device here? */
 879                return;
 880        }
 881
 882        if (!spi_support_wide(starget)) {
 883                spi_max_width(starget) = 0;
 884                max_width = 0;
 885        }
 886
 887        /* test width */
 888        if (i->f->set_width && max_width) {
 889                i->f->set_width(starget, 1);
 890
 891                if (spi_dv_device_compare_inquiry(sdev, buffer,
 892                                                   buffer + len,
 893                                                   DV_LOOPS)
 894                    != SPI_COMPARE_SUCCESS) {
 895                        starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n");
 896                        i->f->set_width(starget, 0);
 897                        /* Make sure we don't force wide back on by asking
 898                         * for a transfer period that requires it */
 899                        max_width = 0;
 900                        if (min_period < 10)
 901                                min_period = 10;
 902                }
 903        }
 904
 905        if (!i->f->set_period)
 906                return;
 907
 908        /* device can't handle synchronous */
 909        if (!spi_support_sync(starget) && !spi_support_dt(starget))
 910                return;
 911
 912        /* len == -1 is the signal that we need to ascertain the
 913         * presence of an echo buffer before trying to use it.  len ==
 914         * 0 means we don't have an echo buffer */
 915        len = -1;
 916
 917 retry:
 918
 919        /* now set up to the maximum */
 920        DV_SET(offset, spi_max_offset(starget));
 921        DV_SET(period, min_period);
 922
 923        /* try QAS requests; this should be harmless to set if the
 924         * target supports it */
 925        if (spi_support_qas(starget) && spi_max_qas(starget)) {
 926                DV_SET(qas, 1);
 927        } else {
 928                DV_SET(qas, 0);
 929        }
 930
 931        if (spi_support_ius(starget) && spi_max_iu(starget) &&
 932            min_period < 9) {
 933                /* This u320 (or u640). Set IU transfers */
 934                DV_SET(iu, 1);
 935                /* Then set the optional parameters */
 936                DV_SET(rd_strm, 1);
 937                DV_SET(wr_flow, 1);
 938                DV_SET(rti, 1);
 939                if (min_period == 8)
 940                        DV_SET(pcomp_en, 1);
 941        } else {
 942                DV_SET(iu, 0);
 943        }
 944
 945        /* now that we've done all this, actually check the bus
 946         * signal type (if known).  Some devices are stupid on
 947         * a SE bus and still claim they can try LVD only settings */
 948        if (i->f->get_signalling)
 949                i->f->get_signalling(shost);
 950        if (spi_signalling(shost) == SPI_SIGNAL_SE ||
 951            spi_signalling(shost) == SPI_SIGNAL_HVD ||
 952            !spi_support_dt(starget)) {
 953                DV_SET(dt, 0);
 954        } else {
 955                DV_SET(dt, 1);
 956        }
 957        /* set width last because it will pull all the other
 958         * parameters down to required values */
 959        DV_SET(width, max_width);
 960
 961        /* Do the read only INQUIRY tests */
 962        spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
 963                       spi_dv_device_compare_inquiry);
 964        /* See if we actually managed to negotiate and sustain DT */
 965        if (i->f->get_dt)
 966                i->f->get_dt(starget);
 967
 968        /* see if the device has an echo buffer.  If it does we can do
 969         * the SPI pattern write tests.  Because of some broken
 970         * devices, we *only* try this on a device that has actually
 971         * negotiated DT */
 972
 973        if (len == -1 && spi_dt(starget))
 974                len = spi_dv_device_get_echo_buffer(sdev, buffer);
 975
 976        if (len <= 0) {
 977                starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
 978                return;
 979        }
 980
 981        if (len > SPI_MAX_ECHO_BUFFER_SIZE) {
 982                starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE);
 983                len = SPI_MAX_ECHO_BUFFER_SIZE;
 984        }
 985
 986        if (spi_dv_retrain(sdev, buffer, buffer + len,
 987                           spi_dv_device_echo_buffer)
 988            == SPI_COMPARE_SKIP_TEST) {
 989                /* OK, the stupid drive can't do a write echo buffer
 990                 * test after all, fall back to the read tests */
 991                len = 0;
 992                goto retry;
 993        }
 994}
 995
 996
 997/**     spi_dv_device - Do Domain Validation on the device
 998 *      @sdev:          scsi device to validate
 999 *
1000 *      Performs the domain validation on the given device in the
1001 *      current execution thread.  Since DV operations may sleep,
1002 *      the current thread must have user context.  Also no SCSI
1003 *      related locks that would deadlock I/O issued by the DV may
1004 *      be held.
1005 */
1006void
1007spi_dv_device(struct scsi_device *sdev)
1008{
1009        struct scsi_target *starget = sdev->sdev_target;
1010        u8 *buffer;
1011        const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
1012
1013        if (unlikely(spi_dv_in_progress(starget)))
1014                return;
1015
1016        if (unlikely(scsi_device_get(sdev)))
1017                return;
1018        spi_dv_in_progress(starget) = 1;
1019
1020        buffer = kzalloc(len, GFP_KERNEL);
1021
1022        if (unlikely(!buffer))
1023                goto out_put;
1024
1025        /* We need to verify that the actual device will quiesce; the
1026         * later target quiesce is just a nice to have */
1027        if (unlikely(scsi_device_quiesce(sdev)))
1028                goto out_free;
1029
1030        scsi_target_quiesce(starget);
1031
1032        spi_dv_pending(starget) = 1;
1033        mutex_lock(&spi_dv_mutex(starget));
1034
1035        starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n");
1036
1037        spi_dv_device_internal(sdev, buffer);
1038
1039        starget_printk(KERN_INFO, starget, "Ending Domain Validation\n");
1040
1041        mutex_unlock(&spi_dv_mutex(starget));
1042        spi_dv_pending(starget) = 0;
1043
1044        scsi_target_resume(starget);
1045
1046        spi_initial_dv(starget) = 1;
1047
1048 out_free:
1049        kfree(buffer);
1050 out_put:
1051        spi_dv_in_progress(starget) = 0;
1052        scsi_device_put(sdev);
1053}
1054EXPORT_SYMBOL(spi_dv_device);
1055
1056struct work_queue_wrapper {
1057        struct work_struct      work;
1058        struct scsi_device      *sdev;
1059};
1060
1061static void
1062spi_dv_device_work_wrapper(struct work_struct *work)
1063{
1064        struct work_queue_wrapper *wqw =
1065                container_of(work, struct work_queue_wrapper, work);
1066        struct scsi_device *sdev = wqw->sdev;
1067
1068        kfree(wqw);
1069        spi_dv_device(sdev);
1070        spi_dv_pending(sdev->sdev_target) = 0;
1071        scsi_device_put(sdev);
1072}
1073
1074
1075/**
1076 *      spi_schedule_dv_device - schedule domain validation to occur on the device
1077 *      @sdev:  The device to validate
1078 *
1079 *      Identical to spi_dv_device() above, except that the DV will be
1080 *      scheduled to occur in a workqueue later.  All memory allocations
1081 *      are atomic, so may be called from any context including those holding
1082 *      SCSI locks.
1083 */
1084void
1085spi_schedule_dv_device(struct scsi_device *sdev)
1086{
1087        struct work_queue_wrapper *wqw =
1088                kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC);
1089
1090        if (unlikely(!wqw))
1091                return;
1092
1093        if (unlikely(spi_dv_pending(sdev->sdev_target))) {
1094                kfree(wqw);
1095                return;
1096        }
1097        /* Set pending early (dv_device doesn't check it, only sets it) */
1098        spi_dv_pending(sdev->sdev_target) = 1;
1099        if (unlikely(scsi_device_get(sdev))) {
1100                kfree(wqw);
1101                spi_dv_pending(sdev->sdev_target) = 0;
1102                return;
1103        }
1104
1105        INIT_WORK(&wqw->work, spi_dv_device_work_wrapper);
1106        wqw->sdev = sdev;
1107
1108        schedule_work(&wqw->work);
1109}
1110EXPORT_SYMBOL(spi_schedule_dv_device);
1111
1112/**
1113 * spi_display_xfer_agreement - Print the current target transfer agreement
1114 * @starget: The target for which to display the agreement
1115 *
1116 * Each SPI port is required to maintain a transfer agreement for each
1117 * other port on the bus.  This function prints a one-line summary of
1118 * the current agreement; more detailed information is available in sysfs.
1119 */
1120void spi_display_xfer_agreement(struct scsi_target *starget)
1121{
1122        struct spi_transport_attrs *tp;
1123        tp = (struct spi_transport_attrs *)&starget->starget_data;
1124
1125        if (tp->offset > 0 && tp->period > 0) {
1126                unsigned int picosec, kb100;
1127                char *scsi = "FAST-?";
1128                char tmp[8];
1129
1130                if (tp->period <= SPI_STATIC_PPR) {
1131                        picosec = ppr_to_ps[tp->period];
1132                        switch (tp->period) {
1133                                case  7: scsi = "FAST-320"; break;
1134                                case  8: scsi = "FAST-160"; break;
1135                                case  9: scsi = "FAST-80"; break;
1136                                case 10:
1137                                case 11: scsi = "FAST-40"; break;
1138                                case 12: scsi = "FAST-20"; break;
1139                        }
1140                } else {
1141                        picosec = tp->period * 4000;
1142                        if (tp->period < 25)
1143                                scsi = "FAST-20";
1144                        else if (tp->period < 50)
1145                                scsi = "FAST-10";
1146                        else
1147                                scsi = "FAST-5";
1148                }
1149
1150                kb100 = (10000000 + picosec / 2) / picosec;
1151                if (tp->width)
1152                        kb100 *= 2;
1153                sprint_frac(tmp, picosec, 1000);
1154
1155                dev_info(&starget->dev,
1156                         "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n",
1157                         scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10,
1158                         tp->dt ? "DT" : "ST",
1159                         tp->iu ? " IU" : "",
1160                         tp->qas  ? " QAS" : "",
1161                         tp->rd_strm ? " RDSTRM" : "",
1162                         tp->rti ? " RTI" : "",
1163                         tp->wr_flow ? " WRFLOW" : "",
1164                         tp->pcomp_en ? " PCOMP" : "",
1165                         tp->hold_mcs ? " HMCS" : "",
1166                         tmp, tp->offset);
1167        } else {
1168                dev_info(&starget->dev, "%sasynchronous\n",
1169                                tp->width ? "wide " : "");
1170        }
1171}
1172EXPORT_SYMBOL(spi_display_xfer_agreement);
1173
1174int spi_populate_width_msg(unsigned char *msg, int width)
1175{
1176        msg[0] = EXTENDED_MESSAGE;
1177        msg[1] = 2;
1178        msg[2] = EXTENDED_WDTR;
1179        msg[3] = width;
1180        return 4;
1181}
1182EXPORT_SYMBOL_GPL(spi_populate_width_msg);
1183
1184int spi_populate_sync_msg(unsigned char *msg, int period, int offset)
1185{
1186        msg[0] = EXTENDED_MESSAGE;
1187        msg[1] = 3;
1188        msg[2] = EXTENDED_SDTR;
1189        msg[3] = period;
1190        msg[4] = offset;
1191        return 5;
1192}
1193EXPORT_SYMBOL_GPL(spi_populate_sync_msg);
1194
1195int spi_populate_ppr_msg(unsigned char *msg, int period, int offset,
1196                int width, int options)
1197{
1198        msg[0] = EXTENDED_MESSAGE;
1199        msg[1] = 6;
1200        msg[2] = EXTENDED_PPR;
1201        msg[3] = period;
1202        msg[4] = 0;
1203        msg[5] = offset;
1204        msg[6] = width;
1205        msg[7] = options;
1206        return 8;
1207}
1208EXPORT_SYMBOL_GPL(spi_populate_ppr_msg);
1209
1210#ifdef CONFIG_SCSI_CONSTANTS
1211static const char * const one_byte_msgs[] = {
1212/* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers",
1213/* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 
1214/* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error",
1215/* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag",
1216/* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 
1217/* 0x0f */ "Initiate Recovery", "Release Recovery",
1218/* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable",
1219/* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset"
1220};
1221
1222static const char * const two_byte_msgs[] = {
1223/* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag",
1224/* 0x23 */ "Ignore Wide Residue", "ACA"
1225};
1226
1227static const char * const extended_msgs[] = {
1228/* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request",
1229/* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request",
1230/* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer"
1231};
1232
1233static void print_nego(const unsigned char *msg, int per, int off, int width)
1234{
1235        if (per) {
1236                char buf[20];
1237                period_to_str(buf, msg[per]);
1238                printk("period = %s ns ", buf);
1239        }
1240
1241        if (off)
1242                printk("offset = %d ", msg[off]);
1243        if (width)
1244                printk("width = %d ", 8 << msg[width]);
1245}
1246
1247static void print_ptr(const unsigned char *msg, int msb, const char *desc)
1248{
1249        int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) |
1250                        msg[msb+3];
1251        printk("%s = %d ", desc, ptr);
1252}
1253
1254int spi_print_msg(const unsigned char *msg)
1255{
1256        int len = 1, i;
1257        if (msg[0] == EXTENDED_MESSAGE) {
1258                len = 2 + msg[1];
1259                if (len == 2)
1260                        len += 256;
1261                if (msg[2] < ARRAY_SIZE(extended_msgs))
1262                        printk ("%s ", extended_msgs[msg[2]]); 
1263                else 
1264                        printk ("Extended Message, reserved code (0x%02x) ",
1265                                (int) msg[2]);
1266                switch (msg[2]) {
1267                case EXTENDED_MODIFY_DATA_POINTER:
1268                        print_ptr(msg, 3, "pointer");
1269                        break;
1270                case EXTENDED_SDTR:
1271                        print_nego(msg, 3, 4, 0);
1272                        break;
1273                case EXTENDED_WDTR:
1274                        print_nego(msg, 0, 0, 3);
1275                        break;
1276                case EXTENDED_PPR:
1277                        print_nego(msg, 3, 5, 6);
1278                        break;
1279                case EXTENDED_MODIFY_BIDI_DATA_PTR:
1280                        print_ptr(msg, 3, "out");
1281                        print_ptr(msg, 7, "in");
1282                        break;
1283                default:
1284                for (i = 2; i < len; ++i) 
1285                        printk("%02x ", msg[i]);
1286                }
1287        /* Identify */
1288        } else if (msg[0] & 0x80) {
1289                printk("Identify disconnect %sallowed %s %d ",
1290                        (msg[0] & 0x40) ? "" : "not ",
1291                        (msg[0] & 0x20) ? "target routine" : "lun",
1292                        msg[0] & 0x7);
1293        /* Normal One byte */
1294        } else if (msg[0] < 0x1f) {
1295                if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]])
1296                        printk("%s ", one_byte_msgs[msg[0]]);
1297                else
1298                        printk("reserved (%02x) ", msg[0]);
1299        } else if (msg[0] == 0x55) {
1300                printk("QAS Request ");
1301        /* Two byte */
1302        } else if (msg[0] <= 0x2f) {
1303                if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs))
1304                        printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 
1305                                msg[1]);
1306                else 
1307                        printk("reserved two byte (%02x %02x) ", 
1308                                msg[0], msg[1]);
1309                len = 2;
1310        } else 
1311                printk("reserved ");
1312        return len;
1313}
1314EXPORT_SYMBOL(spi_print_msg);
1315
1316#else  /* ifndef CONFIG_SCSI_CONSTANTS */
1317
1318int spi_print_msg(const unsigned char *msg)
1319{
1320        int len = 1, i;
1321
1322        if (msg[0] == EXTENDED_MESSAGE) {
1323                len = 2 + msg[1];
1324                if (len == 2)
1325                        len += 256;
1326                for (i = 0; i < len; ++i)
1327                        printk("%02x ", msg[i]);
1328        /* Identify */
1329        } else if (msg[0] & 0x80) {
1330                printk("%02x ", msg[0]);
1331        /* Normal One byte */
1332        } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) {
1333                printk("%02x ", msg[0]);
1334        /* Two byte */
1335        } else if (msg[0] <= 0x2f) {
1336                printk("%02x %02x", msg[0], msg[1]);
1337                len = 2;
1338        } else 
1339                printk("%02x ", msg[0]);
1340        return len;
1341}
1342EXPORT_SYMBOL(spi_print_msg);
1343#endif /* ! CONFIG_SCSI_CONSTANTS */
1344
1345static int spi_device_match(struct attribute_container *cont,
1346                            struct device *dev)
1347{
1348        struct scsi_device *sdev;
1349        struct Scsi_Host *shost;
1350        struct spi_internal *i;
1351
1352        if (!scsi_is_sdev_device(dev))
1353                return 0;
1354
1355        sdev = to_scsi_device(dev);
1356        shost = sdev->host;
1357        if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1358            != &spi_host_class.class)
1359                return 0;
1360        /* Note: this class has no device attributes, so it has
1361         * no per-HBA allocation and thus we don't need to distinguish
1362         * the attribute containers for the device */
1363        i = to_spi_internal(shost->transportt);
1364        if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target))
1365                return 0;
1366        return 1;
1367}
1368
1369static int spi_target_match(struct attribute_container *cont,
1370                            struct device *dev)
1371{
1372        struct Scsi_Host *shost;
1373        struct scsi_target *starget;
1374        struct spi_internal *i;
1375
1376        if (!scsi_is_target_device(dev))
1377                return 0;
1378
1379        shost = dev_to_shost(dev->parent);
1380        if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1381            != &spi_host_class.class)
1382                return 0;
1383
1384        i = to_spi_internal(shost->transportt);
1385        starget = to_scsi_target(dev);
1386
1387        if (i->f->deny_binding && i->f->deny_binding(starget))
1388                return 0;
1389
1390        return &i->t.target_attrs.ac == cont;
1391}
1392
1393static DECLARE_TRANSPORT_CLASS(spi_transport_class,
1394                               "spi_transport",
1395                               spi_setup_transport_attrs,
1396                               NULL,
1397                               spi_target_configure);
1398
1399static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
1400                                    spi_device_match,
1401                                    spi_device_configure);
1402
1403static struct attribute *host_attributes[] = {
1404        &dev_attr_signalling.attr,
1405        &dev_attr_host_width.attr,
1406        &dev_attr_hba_id.attr,
1407        NULL
1408};
1409
1410static struct attribute_group host_attribute_group = {
1411        .attrs = host_attributes,
1412};
1413
1414static int spi_host_configure(struct transport_container *tc,
1415                              struct device *dev,
1416                              struct device *cdev)
1417{
1418        struct kobject *kobj = &cdev->kobj;
1419        struct Scsi_Host *shost = transport_class_to_shost(cdev);
1420        struct spi_internal *si = to_spi_internal(shost->transportt);
1421        struct attribute *attr = &dev_attr_signalling.attr;
1422        int rc = 0;
1423
1424        if (si->f->set_signalling)
1425                rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
1426
1427        return rc;
1428}
1429
1430/* returns true if we should be showing the variable.  Also
1431 * overloads the return by setting 1<<1 if the attribute should
1432 * be writeable */
1433#define TARGET_ATTRIBUTE_HELPER(name) \
1434        (si->f->show_##name ? S_IRUGO : 0) | \
1435        (si->f->set_##name ? S_IWUSR : 0)
1436
1437static umode_t target_attribute_is_visible(struct kobject *kobj,
1438                                          struct attribute *attr, int i)
1439{
1440        struct device *cdev = container_of(kobj, struct device, kobj);
1441        struct scsi_target *starget = transport_class_to_starget(cdev);
1442        struct Scsi_Host *shost = transport_class_to_shost(cdev);
1443        struct spi_internal *si = to_spi_internal(shost->transportt);
1444
1445        if (attr == &dev_attr_period.attr &&
1446            spi_support_sync(starget))
1447                return TARGET_ATTRIBUTE_HELPER(period);
1448        else if (attr == &dev_attr_min_period.attr &&
1449                 spi_support_sync(starget))
1450                return TARGET_ATTRIBUTE_HELPER(period);
1451        else if (attr == &dev_attr_offset.attr &&
1452                 spi_support_sync(starget))
1453                return TARGET_ATTRIBUTE_HELPER(offset);
1454        else if (attr == &dev_attr_max_offset.attr &&
1455                 spi_support_sync(starget))
1456                return TARGET_ATTRIBUTE_HELPER(offset);
1457        else if (attr == &dev_attr_width.attr &&
1458                 spi_support_wide(starget))
1459                return TARGET_ATTRIBUTE_HELPER(width);
1460        else if (attr == &dev_attr_max_width.attr &&
1461                 spi_support_wide(starget))
1462                return TARGET_ATTRIBUTE_HELPER(width);
1463        else if (attr == &dev_attr_iu.attr &&
1464                 spi_support_ius(starget))
1465                return TARGET_ATTRIBUTE_HELPER(iu);
1466        else if (attr == &dev_attr_max_iu.attr &&
1467                 spi_support_ius(starget))
1468                return TARGET_ATTRIBUTE_HELPER(iu);
1469        else if (attr == &dev_attr_dt.attr &&
1470                 spi_support_dt(starget))
1471                return TARGET_ATTRIBUTE_HELPER(dt);
1472        else if (attr == &dev_attr_qas.attr &&
1473                 spi_support_qas(starget))
1474                return TARGET_ATTRIBUTE_HELPER(qas);
1475        else if (attr == &dev_attr_max_qas.attr &&
1476                 spi_support_qas(starget))
1477                return TARGET_ATTRIBUTE_HELPER(qas);
1478        else if (attr == &dev_attr_wr_flow.attr &&
1479                 spi_support_ius(starget))
1480                return TARGET_ATTRIBUTE_HELPER(wr_flow);
1481        else if (attr == &dev_attr_rd_strm.attr &&
1482                 spi_support_ius(starget))
1483                return TARGET_ATTRIBUTE_HELPER(rd_strm);
1484        else if (attr == &dev_attr_rti.attr &&
1485                 spi_support_ius(starget))
1486                return TARGET_ATTRIBUTE_HELPER(rti);
1487        else if (attr == &dev_attr_pcomp_en.attr &&
1488                 spi_support_ius(starget))
1489                return TARGET_ATTRIBUTE_HELPER(pcomp_en);
1490        else if (attr == &dev_attr_hold_mcs.attr &&
1491                 spi_support_ius(starget))
1492                return TARGET_ATTRIBUTE_HELPER(hold_mcs);
1493        else if (attr == &dev_attr_revalidate.attr)
1494                return S_IWUSR;
1495
1496        return 0;
1497}
1498
1499static struct attribute *target_attributes[] = {
1500        &dev_attr_period.attr,
1501        &dev_attr_min_period.attr,
1502        &dev_attr_offset.attr,
1503        &dev_attr_max_offset.attr,
1504        &dev_attr_width.attr,
1505        &dev_attr_max_width.attr,
1506        &dev_attr_iu.attr,
1507        &dev_attr_max_iu.attr,
1508        &dev_attr_dt.attr,
1509        &dev_attr_qas.attr,
1510        &dev_attr_max_qas.attr,
1511        &dev_attr_wr_flow.attr,
1512        &dev_attr_rd_strm.attr,
1513        &dev_attr_rti.attr,
1514        &dev_attr_pcomp_en.attr,
1515        &dev_attr_hold_mcs.attr,
1516        &dev_attr_revalidate.attr,
1517        NULL
1518};
1519
1520static struct attribute_group target_attribute_group = {
1521        .attrs = target_attributes,
1522        .is_visible = target_attribute_is_visible,
1523};
1524
1525static int spi_target_configure(struct transport_container *tc,
1526                                struct device *dev,
1527                                struct device *cdev)
1528{
1529        struct kobject *kobj = &cdev->kobj;
1530
1531        /* force an update based on parameters read from the device */
1532        sysfs_update_group(kobj, &target_attribute_group);
1533
1534        return 0;
1535}
1536
1537struct scsi_transport_template *
1538spi_attach_transport(struct spi_function_template *ft)
1539{
1540        struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
1541                                         GFP_KERNEL);
1542
1543        if (unlikely(!i))
1544                return NULL;
1545
1546        i->t.target_attrs.ac.class = &spi_transport_class.class;
1547        i->t.target_attrs.ac.grp = &target_attribute_group;
1548        i->t.target_attrs.ac.match = spi_target_match;
1549        transport_container_register(&i->t.target_attrs);
1550        i->t.target_size = sizeof(struct spi_transport_attrs);
1551        i->t.host_attrs.ac.class = &spi_host_class.class;
1552        i->t.host_attrs.ac.grp = &host_attribute_group;
1553        i->t.host_attrs.ac.match = spi_host_match;
1554        transport_container_register(&i->t.host_attrs);
1555        i->t.host_size = sizeof(struct spi_host_attrs);
1556        i->f = ft;
1557
1558        return &i->t;
1559}
1560EXPORT_SYMBOL(spi_attach_transport);
1561
1562void spi_release_transport(struct scsi_transport_template *t)
1563{
1564        struct spi_internal *i = to_spi_internal(t);
1565
1566        transport_container_unregister(&i->t.target_attrs);
1567        transport_container_unregister(&i->t.host_attrs);
1568
1569        kfree(i);
1570}
1571EXPORT_SYMBOL(spi_release_transport);
1572
1573static __init int spi_transport_init(void)
1574{
1575        int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI,
1576                                           "SCSI Parallel Transport Class");
1577        if (!error) {
1578                int i;
1579
1580                for (i = 0; spi_static_device_list[i].vendor; i++)
1581                        scsi_dev_info_list_add_keyed(1, /* compatible */
1582                                                     spi_static_device_list[i].vendor,
1583                                                     spi_static_device_list[i].model,
1584                                                     NULL,
1585                                                     spi_static_device_list[i].flags,
1586                                                     SCSI_DEVINFO_SPI);
1587        }
1588
1589        error = transport_class_register(&spi_transport_class);
1590        if (error)
1591                return error;
1592        error = anon_transport_class_register(&spi_device_class);
1593        return transport_class_register(&spi_host_class);
1594}
1595
1596static void __exit spi_transport_exit(void)
1597{
1598        transport_class_unregister(&spi_transport_class);
1599        anon_transport_class_unregister(&spi_device_class);
1600        transport_class_unregister(&spi_host_class);
1601        scsi_dev_info_remove_list(SCSI_DEVINFO_SPI);
1602}
1603
1604MODULE_AUTHOR("Martin Hicks");
1605MODULE_DESCRIPTION("SPI Transport Attributes");
1606MODULE_LICENSE("GPL");
1607
1608module_init(spi_transport_init);
1609module_exit(spi_transport_exit);
1610
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