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