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