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 that's a real SCSI device 370 * so we return 1 to terminate the iteration when we find it */ 371 static int child_iter(struct device *dev, void *data) 372 { 373 if (!scsi_is_sdev_device(dev)) 374 return 0; 375 376 spi_dv_device(to_scsi_device(dev)); 377 return 1; 378 } 379 380 static ssize_t 381 store_spi_revalidate(struct device *dev, struct device_attribute *attr, 382 const char *buf, size_t count) 383 { 384 struct scsi_target *starget = transport_class_to_starget(dev); 385 386 device_for_each_child(&starget->dev, NULL, child_iter); 387 return count; 388 } 389 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); 390 391 /* Translate the period into ns according to the current spec 392 * for SDTR/PPR messages */ 393 static int period_to_str(char *buf, int period) 394 { 395 int len, picosec; 396 397 if (period < 0 || period > 0xff) { 398 picosec = -1; 399 } else if (period <= SPI_STATIC_PPR) { 400 picosec = ppr_to_ps[period]; 401 } else { 402 picosec = period * 4000; 403 } 404 405 if (picosec == -1) { 406 len = sprintf(buf, "reserved"); 407 } else { 408 len = sprint_frac(buf, picosec, 1000); 409 } 410 411 return len; 412 } 413 414 static ssize_t 415 show_spi_transport_period_helper(char *buf, int period) 416 { 417 int len = period_to_str(buf, period); 418 buf[len++] = '\n'; 419 buf[len] = '\0'; 420 return len; 421 } 422 423 static ssize_t 424 store_spi_transport_period_helper(struct device *dev, const char *buf, 425 size_t count, int *periodp) 426 { 427 int j, picosec, period = -1; 428 char *endp; 429 430 picosec = simple_strtoul(buf, &endp, 10) * 1000; 431 if (*endp == '.') { 432 int mult = 100; 433 do { 434 endp++; 435 if (!isdigit(*endp)) 436 break; 437 picosec += (*endp - '0') * mult; 438 mult /= 10; 439 } while (mult > 0); 440 } 441 442 for (j = 0; j <= SPI_STATIC_PPR; j++) { 443 if (ppr_to_ps[j] < picosec) 444 continue; 445 period = j; 446 break; 447 } 448 449 if (period == -1) 450 period = picosec / 4000; 451 452 if (period > 0xff) 453 period = 0xff; 454 455 *periodp = period; 456 457 return count; 458 } 459 460 static ssize_t 461 show_spi_transport_period(struct device *dev, 462 struct device_attribute *attr, char *buf) 463 { 464 struct scsi_target *starget = transport_class_to_starget(dev); 465 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 466 struct spi_internal *i = to_spi_internal(shost->transportt); 467 struct spi_transport_attrs *tp = 468 (struct spi_transport_attrs *)&starget->starget_data; 469 470 if (i->f->get_period) 471 i->f->get_period(starget); 472 473 return show_spi_transport_period_helper(buf, tp->period); 474 } 475 476 static ssize_t 477 store_spi_transport_period(struct device *cdev, struct device_attribute *attr, 478 const char *buf, size_t count) 479 { 480 struct scsi_target *starget = transport_class_to_starget(cdev); 481 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 482 struct spi_internal *i = to_spi_internal(shost->transportt); 483 struct spi_transport_attrs *tp = 484 (struct spi_transport_attrs *)&starget->starget_data; 485 int period, retval; 486 487 if (!i->f->set_period) 488 return -EINVAL; 489 490 retval = store_spi_transport_period_helper(cdev, buf, count, &period); 491 492 if (period < tp->min_period) 493 period = tp->min_period; 494 495 i->f->set_period(starget, period); 496 497 return retval; 498 } 499 500 static DEVICE_ATTR(period, S_IRUGO, 501 show_spi_transport_period, 502 store_spi_transport_period); 503 504 static ssize_t 505 show_spi_transport_min_period(struct device *cdev, 506 struct device_attribute *attr, char *buf) 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; 513 514 if (!i->f->set_period) 515 return -EINVAL; 516 517 return show_spi_transport_period_helper(buf, tp->min_period); 518 } 519 520 static ssize_t 521 store_spi_transport_min_period(struct device *cdev, 522 struct device_attribute *attr, 523 const char *buf, size_t count) 524 { 525 struct scsi_target *starget = transport_class_to_starget(cdev); 526 struct spi_transport_attrs *tp = 527 (struct spi_transport_attrs *)&starget->starget_data; 528 529 return store_spi_transport_period_helper(cdev, buf, count, 530 &tp->min_period); 531 } 532 533 534 static DEVICE_ATTR(min_period, S_IRUGO, 535 show_spi_transport_min_period, 536 store_spi_transport_min_period); 537 538 539 static ssize_t show_spi_host_signalling(struct device *cdev, 540 struct device_attribute *attr, 541 char *buf) 542 { 543 struct Scsi_Host *shost = transport_class_to_shost(cdev); 544 struct spi_internal *i = to_spi_internal(shost->transportt); 545 546 if (i->f->get_signalling) 547 i->f->get_signalling(shost); 548 549 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); 550 } 551 static ssize_t store_spi_host_signalling(struct device *dev, 552 struct device_attribute *attr, 553 const char *buf, size_t count) 554 { 555 struct Scsi_Host *shost = transport_class_to_shost(dev); 556 struct spi_internal *i = to_spi_internal(shost->transportt); 557 enum spi_signal_type type = spi_signal_to_value(buf); 558 559 if (!i->f->set_signalling) 560 return -EINVAL; 561 562 if (type != SPI_SIGNAL_UNKNOWN) 563 i->f->set_signalling(shost, type); 564 565 return count; 566 } 567 static DEVICE_ATTR(signalling, S_IRUGO, 568 show_spi_host_signalling, 569 store_spi_host_signalling); 570 571 #define DV_SET(x, y) \ 572 if(i->f->set_##x) \ 573 i->f->set_##x(sdev->sdev_target, y) 574 575 enum spi_compare_returns { 576 SPI_COMPARE_SUCCESS, 577 SPI_COMPARE_FAILURE, 578 SPI_COMPARE_SKIP_TEST, 579 }; 580 581 582 /* This is for read/write Domain Validation: If the device supports 583 * an echo buffer, we do read/write tests to it */ 584 static enum spi_compare_returns 585 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, 586 u8 *ptr, const int retries) 587 { 588 int len = ptr - buffer; 589 int j, k, r, result; 590 unsigned int pattern = 0x0000ffff; 591 struct scsi_sense_hdr sshdr; 592 593 const char spi_write_buffer[] = { 594 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 595 }; 596 const char spi_read_buffer[] = { 597 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 598 }; 599 600 /* set up the pattern buffer. Doesn't matter if we spill 601 * slightly beyond since that's where the read buffer is */ 602 for (j = 0; j < len; ) { 603 604 /* fill the buffer with counting (test a) */ 605 for ( ; j < min(len, 32); j++) 606 buffer[j] = j; 607 k = j; 608 /* fill the buffer with alternating words of 0x0 and 609 * 0xffff (test b) */ 610 for ( ; j < min(len, k + 32); j += 2) { 611 u16 *word = (u16 *)&buffer[j]; 612 613 *word = (j & 0x02) ? 0x0000 : 0xffff; 614 } 615 k = j; 616 /* fill with crosstalk (alternating 0x5555 0xaaa) 617 * (test c) */ 618 for ( ; j < min(len, k + 32); j += 2) { 619 u16 *word = (u16 *)&buffer[j]; 620 621 *word = (j & 0x02) ? 0x5555 : 0xaaaa; 622 } 623 k = j; 624 /* fill with shifting bits (test d) */ 625 for ( ; j < min(len, k + 32); j += 4) { 626 u32 *word = (unsigned int *)&buffer[j]; 627 u32 roll = (pattern & 0x80000000) ? 1 : 0; 628 629 *word = pattern; 630 pattern = (pattern << 1) | roll; 631 } 632 /* don't bother with random data (test e) */ 633 } 634 635 for (r = 0; r < retries; r++) { 636 result = spi_execute(sdev, spi_write_buffer, DMA_TO_DEVICE, 637 buffer, len, &sshdr); 638 if(result || !scsi_device_online(sdev)) { 639 640 scsi_device_set_state(sdev, SDEV_QUIESCE); 641 if (scsi_sense_valid(&sshdr) 642 && sshdr.sense_key == ILLEGAL_REQUEST 643 /* INVALID FIELD IN CDB */ 644 && sshdr.asc == 0x24 && sshdr.ascq == 0x00) 645 /* This would mean that the drive lied 646 * to us about supporting an echo 647 * buffer (unfortunately some Western 648 * Digital drives do precisely this) 649 */ 650 return SPI_COMPARE_SKIP_TEST; 651 652 653 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); 654 return SPI_COMPARE_FAILURE; 655 } 656 657 memset(ptr, 0, len); 658 spi_execute(sdev, spi_read_buffer, DMA_FROM_DEVICE, 659 ptr, len, NULL); 660 scsi_device_set_state(sdev, SDEV_QUIESCE); 661 662 if (memcmp(buffer, ptr, len) != 0) 663 return SPI_COMPARE_FAILURE; 664 } 665 return SPI_COMPARE_SUCCESS; 666 } 667 668 /* This is for the simplest form of Domain Validation: a read test 669 * on the inquiry data from the device */ 670 static enum spi_compare_returns 671 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, 672 u8 *ptr, const int retries) 673 { 674 int r, result; 675 const int len = sdev->inquiry_len; 676 const char spi_inquiry[] = { 677 INQUIRY, 0, 0, 0, len, 0 678 }; 679 680 for (r = 0; r < retries; r++) { 681 memset(ptr, 0, len); 682 683 result = spi_execute(sdev, spi_inquiry, DMA_FROM_DEVICE, 684 ptr, len, NULL); 685 686 if(result || !scsi_device_online(sdev)) { 687 scsi_device_set_state(sdev, SDEV_QUIESCE); 688 return SPI_COMPARE_FAILURE; 689 } 690 691 /* If we don't have the inquiry data already, the 692 * first read gets it */ 693 if (ptr == buffer) { 694 ptr += len; 695 --r; 696 continue; 697 } 698 699 if (memcmp(buffer, ptr, len) != 0) 700 /* failure */ 701 return SPI_COMPARE_FAILURE; 702 } 703 return SPI_COMPARE_SUCCESS; 704 } 705 706 static enum spi_compare_returns 707 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, 708 enum spi_compare_returns 709 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) 710 { 711 struct spi_internal *i = to_spi_internal(sdev->host->transportt); 712 struct scsi_target *starget = sdev->sdev_target; 713 int period = 0, prevperiod = 0; 714 enum spi_compare_returns retval; 715 716 717 for (;;) { 718 int newperiod; 719 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); 720 721 if (retval == SPI_COMPARE_SUCCESS 722 || retval == SPI_COMPARE_SKIP_TEST) 723 break; 724 725 /* OK, retrain, fallback */ 726 if (i->f->get_iu) 727 i->f->get_iu(starget); 728 if (i->f->get_qas) 729 i->f->get_qas(starget); 730 if (i->f->get_period) 731 i->f->get_period(sdev->sdev_target); 732 733 /* Here's the fallback sequence; first try turning off 734 * IU, then QAS (if we can control them), then finally 735 * fall down the periods */ 736 if (i->f->set_iu && spi_iu(starget)) { 737 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Information Units\n"); 738 DV_SET(iu, 0); 739 } else if (i->f->set_qas && spi_qas(starget)) { 740 starget_printk(KERN_ERR, starget, "Domain Validation Disabing Quick Arbitration and Selection\n"); 741 DV_SET(qas, 0); 742 } else { 743 newperiod = spi_period(starget); 744 period = newperiod > period ? newperiod : period; 745 if (period < 0x0d) 746 period++; 747 else 748 period += period >> 1; 749 750 if (unlikely(period > 0xff || period == prevperiod)) { 751 /* Total failure; set to async and return */ 752 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); 753 DV_SET(offset, 0); 754 return SPI_COMPARE_FAILURE; 755 } 756 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); 757 DV_SET(period, period); 758 prevperiod = period; 759 } 760 } 761 return retval; 762 } 763 764 static int 765 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) 766 { 767 int l, result; 768 769 /* first off do a test unit ready. This can error out 770 * because of reservations or some other reason. If it 771 * fails, the device won't let us write to the echo buffer 772 * so just return failure */ 773 774 const char spi_test_unit_ready[] = { 775 TEST_UNIT_READY, 0, 0, 0, 0, 0 776 }; 777 778 const char spi_read_buffer_descriptor[] = { 779 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 780 }; 781 782 783 /* We send a set of three TURs to clear any outstanding 784 * unit attention conditions if they exist (Otherwise the 785 * buffer tests won't be happy). If the TUR still fails 786 * (reservation conflict, device not ready, etc) just 787 * skip the write tests */ 788 for (l = 0; ; l++) { 789 result = spi_execute(sdev, spi_test_unit_ready, DMA_NONE, 790 NULL, 0, NULL); 791 792 if(result) { 793 if(l >= 3) 794 return 0; 795 } else { 796 /* TUR succeeded */ 797 break; 798 } 799 } 800 801 result = spi_execute(sdev, spi_read_buffer_descriptor, 802 DMA_FROM_DEVICE, buffer, 4, NULL); 803 804 if (result) 805 /* Device has no echo buffer */ 806 return 0; 807 808 return buffer[3] + ((buffer[2] & 0x1f) << 8); 809 } 810 811 static void 812 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) 813 { 814 struct spi_internal *i = to_spi_internal(sdev->host->transportt); 815 struct scsi_target *starget = sdev->sdev_target; 816 struct Scsi_Host *shost = sdev->host; 817 int len = sdev->inquiry_len; 818 int min_period = spi_min_period(starget); 819 int max_width = spi_max_width(starget); 820 /* first set us up for narrow async */ 821 DV_SET(offset, 0); 822 DV_SET(width, 0); 823 824 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) 825 != SPI_COMPARE_SUCCESS) { 826 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); 827 /* FIXME: should probably offline the device here? */ 828 return; 829 } 830 831 if (!scsi_device_wide(sdev)) { 832 spi_max_width(starget) = 0; 833 max_width = 0; 834 } 835 836 /* test width */ 837 if (i->f->set_width && max_width) { 838 i->f->set_width(starget, 1); 839 840 if (spi_dv_device_compare_inquiry(sdev, buffer, 841 buffer + len, 842 DV_LOOPS) 843 != SPI_COMPARE_SUCCESS) { 844 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); 845 i->f->set_width(starget, 0); 846 /* Make sure we don't force wide back on by asking 847 * for a transfer period that requires it */ 848 max_width = 0; 849 if (min_period < 10) 850 min_period = 10; 851 } 852 } 853 854 if (!i->f->set_period) 855 return; 856 857 /* device can't handle synchronous */ 858 if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev)) 859 return; 860 861 /* len == -1 is the signal that we need to ascertain the 862 * presence of an echo buffer before trying to use it. len == 863 * 0 means we don't have an echo buffer */ 864 len = -1; 865 866 retry: 867 868 /* now set up to the maximum */ 869 DV_SET(offset, spi_max_offset(starget)); 870 DV_SET(period, min_period); 871 872 /* try QAS requests; this should be harmless to set if the 873 * target supports it */ 874 if (scsi_device_qas(sdev)) { 875 DV_SET(qas, 1); 876 } else { 877 DV_SET(qas, 0); 878 } 879 880 if (scsi_device_ius(sdev) && min_period < 9) { 881 /* This u320 (or u640). Set IU transfers */ 882 DV_SET(iu, 1); 883 /* Then set the optional parameters */ 884 DV_SET(rd_strm, 1); 885 DV_SET(wr_flow, 1); 886 DV_SET(rti, 1); 887 if (min_period == 8) 888 DV_SET(pcomp_en, 1); 889 } else { 890 DV_SET(iu, 0); 891 } 892 893 /* now that we've done all this, actually check the bus 894 * signal type (if known). Some devices are stupid on 895 * a SE bus and still claim they can try LVD only settings */ 896 if (i->f->get_signalling) 897 i->f->get_signalling(shost); 898 if (spi_signalling(shost) == SPI_SIGNAL_SE || 899 spi_signalling(shost) == SPI_SIGNAL_HVD || 900 !scsi_device_dt(sdev)) { 901 DV_SET(dt, 0); 902 } else { 903 DV_SET(dt, 1); 904 } 905 /* set width last because it will pull all the other 906 * parameters down to required values */ 907 DV_SET(width, max_width); 908 909 /* Do the read only INQUIRY tests */ 910 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, 911 spi_dv_device_compare_inquiry); 912 /* See if we actually managed to negotiate and sustain DT */ 913 if (i->f->get_dt) 914 i->f->get_dt(starget); 915 916 /* see if the device has an echo buffer. If it does we can do 917 * the SPI pattern write tests. Because of some broken 918 * devices, we *only* try this on a device that has actually 919 * negotiated DT */ 920 921 if (len == -1 && spi_dt(starget)) 922 len = spi_dv_device_get_echo_buffer(sdev, buffer); 923 924 if (len <= 0) { 925 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); 926 return; 927 } 928 929 if (len > SPI_MAX_ECHO_BUFFER_SIZE) { 930 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); 931 len = SPI_MAX_ECHO_BUFFER_SIZE; 932 } 933 934 if (spi_dv_retrain(sdev, buffer, buffer + len, 935 spi_dv_device_echo_buffer) 936 == SPI_COMPARE_SKIP_TEST) { 937 /* OK, the stupid drive can't do a write echo buffer 938 * test after all, fall back to the read tests */ 939 len = 0; 940 goto retry; 941 } 942 } 943 944 945 /** spi_dv_device - Do Domain Validation on the device 946 * @sdev: scsi device to validate 947 * 948 * Performs the domain validation on the given device in the 949 * current execution thread. Since DV operations may sleep, 950 * the current thread must have user context. Also no SCSI 951 * related locks that would deadlock I/O issued by the DV may 952 * be held. 953 */ 954 void 955 spi_dv_device(struct scsi_device *sdev) 956 { 957 struct scsi_target *starget = sdev->sdev_target; 958 u8 *buffer; 959 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; 960 961 if (unlikely(scsi_device_get(sdev))) 962 return; 963 964 if (unlikely(spi_dv_in_progress(starget))) 965 return; 966 spi_dv_in_progress(starget) = 1; 967 968 buffer = kzalloc(len, GFP_KERNEL); 969 970 if (unlikely(!buffer)) 971 goto out_put; 972 973 /* We need to verify that the actual device will quiesce; the 974 * later target quiesce is just a nice to have */ 975 if (unlikely(scsi_device_quiesce(sdev))) 976 goto out_free; 977 978 scsi_target_quiesce(starget); 979 980 spi_dv_pending(starget) = 1; 981 mutex_lock(&spi_dv_mutex(starget)); 982 983 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); 984 985 spi_dv_device_internal(sdev, buffer); 986 987 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); 988 989 mutex_unlock(&spi_dv_mutex(starget)); 990 spi_dv_pending(starget) = 0; 991 992 scsi_target_resume(starget); 993 994 spi_initial_dv(starget) = 1; 995 996 out_free: 997 kfree(buffer); 998 out_put: 999 spi_dv_in_progress(starget) = 0; 1000 scsi_device_put(sdev); 1001 } 1002 EXPORT_SYMBOL(spi_dv_device); 1003 1004 struct work_queue_wrapper { 1005 struct work_struct work; 1006 struct scsi_device *sdev; 1007 }; 1008 1009 static void 1010 spi_dv_device_work_wrapper(struct work_struct *work) 1011 { 1012 struct work_queue_wrapper *wqw = 1013 container_of(work, struct work_queue_wrapper, work); 1014 struct scsi_device *sdev = wqw->sdev; 1015 1016 kfree(wqw); 1017 spi_dv_device(sdev); 1018 spi_dv_pending(sdev->sdev_target) = 0; 1019 scsi_device_put(sdev); 1020 } 1021 1022 1023 /** 1024 * spi_schedule_dv_device - schedule domain validation to occur on the device 1025 * @sdev: The device to validate 1026 * 1027 * Identical to spi_dv_device() above, except that the DV will be 1028 * scheduled to occur in a workqueue later. All memory allocations 1029 * are atomic, so may be called from any context including those holding 1030 * SCSI locks. 1031 */ 1032 void 1033 spi_schedule_dv_device(struct scsi_device *sdev) 1034 { 1035 struct work_queue_wrapper *wqw = 1036 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); 1037 1038 if (unlikely(!wqw)) 1039 return; 1040 1041 if (unlikely(spi_dv_pending(sdev->sdev_target))) { 1042 kfree(wqw); 1043 return; 1044 } 1045 /* Set pending early (dv_device doesn't check it, only sets it) */ 1046 spi_dv_pending(sdev->sdev_target) = 1; 1047 if (unlikely(scsi_device_get(sdev))) { 1048 kfree(wqw); 1049 spi_dv_pending(sdev->sdev_target) = 0; 1050 return; 1051 } 1052 1053 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); 1054 wqw->sdev = sdev; 1055 1056 schedule_work(&wqw->work); 1057 } 1058 EXPORT_SYMBOL(spi_schedule_dv_device); 1059 1060 /** 1061 * spi_display_xfer_agreement - Print the current target transfer agreement 1062 * @starget: The target for which to display the agreement 1063 * 1064 * Each SPI port is required to maintain a transfer agreement for each 1065 * other port on the bus. This function prints a one-line summary of 1066 * the current agreement; more detailed information is available in sysfs. 1067 */ 1068 void spi_display_xfer_agreement(struct scsi_target *starget) 1069 { 1070 struct spi_transport_attrs *tp; 1071 tp = (struct spi_transport_attrs *)&starget->starget_data; 1072 1073 if (tp->offset > 0 && tp->period > 0) { 1074 unsigned int picosec, kb100; 1075 char *scsi = "FAST-?"; 1076 char tmp[8]; 1077 1078 if (tp->period <= SPI_STATIC_PPR) { 1079 picosec = ppr_to_ps[tp->period]; 1080 switch (tp->period) { 1081 case 7: scsi = "FAST-320"; break; 1082 case 8: scsi = "FAST-160"; break; 1083 case 9: scsi = "FAST-80"; break; 1084 case 10: 1085 case 11: scsi = "FAST-40"; break; 1086 case 12: scsi = "FAST-20"; break; 1087 } 1088 } else { 1089 picosec = tp->period * 4000; 1090 if (tp->period < 25) 1091 scsi = "FAST-20"; 1092 else if (tp->period < 50) 1093 scsi = "FAST-10"; 1094 else 1095 scsi = "FAST-5"; 1096 } 1097 1098 kb100 = (10000000 + picosec / 2) / picosec; 1099 if (tp->width) 1100 kb100 *= 2; 1101 sprint_frac(tmp, picosec, 1000); 1102 1103 dev_info(&starget->dev, 1104 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", 1105 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, 1106 tp->dt ? "DT" : "ST", 1107 tp->iu ? " IU" : "", 1108 tp->qas ? " QAS" : "", 1109 tp->rd_strm ? " RDSTRM" : "", 1110 tp->rti ? " RTI" : "", 1111 tp->wr_flow ? " WRFLOW" : "", 1112 tp->pcomp_en ? " PCOMP" : "", 1113 tp->hold_mcs ? " HMCS" : "", 1114 tmp, tp->offset); 1115 } else { 1116 dev_info(&starget->dev, "%sasynchronous\n", 1117 tp->width ? "wide " : ""); 1118 } 1119 } 1120 EXPORT_SYMBOL(spi_display_xfer_agreement); 1121 1122 int spi_populate_width_msg(unsigned char *msg, int width) 1123 { 1124 msg[0] = EXTENDED_MESSAGE; 1125 msg[1] = 2; 1126 msg[2] = EXTENDED_WDTR; 1127 msg[3] = width; 1128 return 4; 1129 } 1130 EXPORT_SYMBOL_GPL(spi_populate_width_msg); 1131 1132 int spi_populate_sync_msg(unsigned char *msg, int period, int offset) 1133 { 1134 msg[0] = EXTENDED_MESSAGE; 1135 msg[1] = 3; 1136 msg[2] = EXTENDED_SDTR; 1137 msg[3] = period; 1138 msg[4] = offset; 1139 return 5; 1140 } 1141 EXPORT_SYMBOL_GPL(spi_populate_sync_msg); 1142 1143 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, 1144 int width, int options) 1145 { 1146 msg[0] = EXTENDED_MESSAGE; 1147 msg[1] = 6; 1148 msg[2] = EXTENDED_PPR; 1149 msg[3] = period; 1150 msg[4] = 0; 1151 msg[5] = offset; 1152 msg[6] = width; 1153 msg[7] = options; 1154 return 8; 1155 } 1156 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); 1157 1158 #ifdef CONFIG_SCSI_CONSTANTS 1159 static const char * const one_byte_msgs[] = { 1160 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", 1161 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 1162 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", 1163 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", 1164 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 1165 /* 0x0f */ "Initiate Recovery", "Release Recovery", 1166 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", 1167 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" 1168 }; 1169 1170 static const char * const two_byte_msgs[] = { 1171 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", 1172 /* 0x23 */ "Ignore Wide Residue", "ACA" 1173 }; 1174 1175 static const char * const extended_msgs[] = { 1176 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", 1177 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", 1178 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" 1179 }; 1180 1181 static void print_nego(const unsigned char *msg, int per, int off, int width) 1182 { 1183 if (per) { 1184 char buf[20]; 1185 period_to_str(buf, msg[per]); 1186 printk("period = %s ns ", buf); 1187 } 1188 1189 if (off) 1190 printk("offset = %d ", msg[off]); 1191 if (width) 1192 printk("width = %d ", 8 << msg[width]); 1193 } 1194 1195 static void print_ptr(const unsigned char *msg, int msb, const char *desc) 1196 { 1197 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | 1198 msg[msb+3]; 1199 printk("%s = %d ", desc, ptr); 1200 } 1201 1202 int spi_print_msg(const unsigned char *msg) 1203 { 1204 int len = 1, i; 1205 if (msg[0] == EXTENDED_MESSAGE) { 1206 len = 2 + msg[1]; 1207 if (len == 2) 1208 len += 256; 1209 if (msg[2] < ARRAY_SIZE(extended_msgs)) 1210 printk ("%s ", extended_msgs[msg[2]]); 1211 else 1212 printk ("Extended Message, reserved code (0x%02x) ", 1213 (int) msg[2]); 1214 switch (msg[2]) { 1215 case EXTENDED_MODIFY_DATA_POINTER: 1216 print_ptr(msg, 3, "pointer"); 1217 break; 1218 case EXTENDED_SDTR: 1219 print_nego(msg, 3, 4, 0); 1220 break; 1221 case EXTENDED_WDTR: 1222 print_nego(msg, 0, 0, 3); 1223 break; 1224 case EXTENDED_PPR: 1225 print_nego(msg, 3, 5, 6); 1226 break; 1227 case EXTENDED_MODIFY_BIDI_DATA_PTR: 1228 print_ptr(msg, 3, "out"); 1229 print_ptr(msg, 7, "in"); 1230 break; 1231 default: 1232 for (i = 2; i < len; ++i) 1233 printk("%02x ", msg[i]); 1234 } 1235 /* Identify */ 1236 } else if (msg[0] & 0x80) { 1237 printk("Identify disconnect %sallowed %s %d ", 1238 (msg[0] & 0x40) ? "" : "not ", 1239 (msg[0] & 0x20) ? "target routine" : "lun", 1240 msg[0] & 0x7); 1241 /* Normal One byte */ 1242 } else if (msg[0] < 0x1f) { 1243 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) 1244 printk("%s ", one_byte_msgs[msg[0]]); 1245 else 1246 printk("reserved (%02x) ", msg[0]); 1247 } else if (msg[0] == 0x55) { 1248 printk("QAS Request "); 1249 /* Two byte */ 1250 } else if (msg[0] <= 0x2f) { 1251 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) 1252 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 1253 msg[1]); 1254 else 1255 printk("reserved two byte (%02x %02x) ", 1256 msg[0], msg[1]); 1257 len = 2; 1258 } else 1259 printk("reserved "); 1260 return len; 1261 } 1262 EXPORT_SYMBOL(spi_print_msg); 1263 1264 #else /* ifndef CONFIG_SCSI_CONSTANTS */ 1265 1266 int spi_print_msg(const unsigned char *msg) 1267 { 1268 int len = 1, i; 1269 1270 if (msg[0] == EXTENDED_MESSAGE) { 1271 len = 2 + msg[1]; 1272 if (len == 2) 1273 len += 256; 1274 for (i = 0; i < len; ++i) 1275 printk("%02x ", msg[i]); 1276 /* Identify */ 1277 } else if (msg[0] & 0x80) { 1278 printk("%02x ", msg[0]); 1279 /* Normal One byte */ 1280 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { 1281 printk("%02x ", msg[0]); 1282 /* Two byte */ 1283 } else if (msg[0] <= 0x2f) { 1284 printk("%02x %02x", msg[0], msg[1]); 1285 len = 2; 1286 } else 1287 printk("%02x ", msg[0]); 1288 return len; 1289 } 1290 EXPORT_SYMBOL(spi_print_msg); 1291 #endif /* ! CONFIG_SCSI_CONSTANTS */ 1292 1293 static int spi_device_match(struct attribute_container *cont, 1294 struct device *dev) 1295 { 1296 struct scsi_device *sdev; 1297 struct Scsi_Host *shost; 1298 struct spi_internal *i; 1299 1300 if (!scsi_is_sdev_device(dev)) 1301 return 0; 1302 1303 sdev = to_scsi_device(dev); 1304 shost = sdev->host; 1305 if (!shost->transportt || shost->transportt->host_attrs.ac.class 1306 != &spi_host_class.class) 1307 return 0; 1308 /* Note: this class has no device attributes, so it has 1309 * no per-HBA allocation and thus we don't need to distinguish 1310 * the attribute containers for the device */ 1311 i = to_spi_internal(shost->transportt); 1312 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) 1313 return 0; 1314 return 1; 1315 } 1316 1317 static int spi_target_match(struct attribute_container *cont, 1318 struct device *dev) 1319 { 1320 struct Scsi_Host *shost; 1321 struct scsi_target *starget; 1322 struct spi_internal *i; 1323 1324 if (!scsi_is_target_device(dev)) 1325 return 0; 1326 1327 shost = dev_to_shost(dev->parent); 1328 if (!shost->transportt || shost->transportt->host_attrs.ac.class 1329 != &spi_host_class.class) 1330 return 0; 1331 1332 i = to_spi_internal(shost->transportt); 1333 starget = to_scsi_target(dev); 1334 1335 if (i->f->deny_binding && i->f->deny_binding(starget)) 1336 return 0; 1337 1338 return &i->t.target_attrs.ac == cont; 1339 } 1340 1341 static DECLARE_TRANSPORT_CLASS(spi_transport_class, 1342 "spi_transport", 1343 spi_setup_transport_attrs, 1344 NULL, 1345 spi_target_configure); 1346 1347 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, 1348 spi_device_match, 1349 spi_device_configure); 1350 1351 static struct attribute *host_attributes[] = { 1352 &dev_attr_signalling.attr, 1353 NULL 1354 }; 1355 1356 static struct attribute_group host_attribute_group = { 1357 .attrs = host_attributes, 1358 }; 1359 1360 static int spi_host_configure(struct transport_container *tc, 1361 struct device *dev, 1362 struct device *cdev) 1363 { 1364 struct kobject *kobj = &cdev->kobj; 1365 struct Scsi_Host *shost = transport_class_to_shost(cdev); 1366 struct spi_internal *si = to_spi_internal(shost->transportt); 1367 struct attribute *attr = &dev_attr_signalling.attr; 1368 int rc = 0; 1369 1370 if (si->f->set_signalling) 1371 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); 1372 1373 return rc; 1374 } 1375 1376 /* returns true if we should be showing the variable. Also 1377 * overloads the return by setting 1<<1 if the attribute should 1378 * be writeable */ 1379 #define TARGET_ATTRIBUTE_HELPER(name) \ 1380 (si->f->show_##name ? S_IRUGO : 0) | \ 1381 (si->f->set_##name ? S_IWUSR : 0) 1382 1383 static mode_t target_attribute_is_visible(struct kobject *kobj, 1384 struct attribute *attr, int i) 1385 { 1386 struct device *cdev = container_of(kobj, struct device, kobj); 1387 struct scsi_target *starget = transport_class_to_starget(cdev); 1388 struct Scsi_Host *shost = transport_class_to_shost(cdev); 1389 struct spi_internal *si = to_spi_internal(shost->transportt); 1390 1391 if (attr == &dev_attr_period.attr && 1392 spi_support_sync(starget)) 1393 return TARGET_ATTRIBUTE_HELPER(period); 1394 else if (attr == &dev_attr_min_period.attr && 1395 spi_support_sync(starget)) 1396 return TARGET_ATTRIBUTE_HELPER(period); 1397 else if (attr == &dev_attr_offset.attr && 1398 spi_support_sync(starget)) 1399 return TARGET_ATTRIBUTE_HELPER(offset); 1400 else if (attr == &dev_attr_max_offset.attr && 1401 spi_support_sync(starget)) 1402 return TARGET_ATTRIBUTE_HELPER(offset); 1403 else if (attr == &dev_attr_width.attr && 1404 spi_support_wide(starget)) 1405 return TARGET_ATTRIBUTE_HELPER(width); 1406 else if (attr == &dev_attr_max_width.attr && 1407 spi_support_wide(starget)) 1408 return TARGET_ATTRIBUTE_HELPER(width); 1409 else if (attr == &dev_attr_iu.attr && 1410 spi_support_ius(starget)) 1411 return TARGET_ATTRIBUTE_HELPER(iu); 1412 else if (attr == &dev_attr_dt.attr && 1413 spi_support_dt(starget)) 1414 return TARGET_ATTRIBUTE_HELPER(dt); 1415 else if (attr == &dev_attr_qas.attr && 1416 spi_support_qas(starget)) 1417 return TARGET_ATTRIBUTE_HELPER(qas); 1418 else if (attr == &dev_attr_wr_flow.attr && 1419 spi_support_ius(starget)) 1420 return TARGET_ATTRIBUTE_HELPER(wr_flow); 1421 else if (attr == &dev_attr_rd_strm.attr && 1422 spi_support_ius(starget)) 1423 return TARGET_ATTRIBUTE_HELPER(rd_strm); 1424 else if (attr == &dev_attr_rti.attr && 1425 spi_support_ius(starget)) 1426 return TARGET_ATTRIBUTE_HELPER(rti); 1427 else if (attr == &dev_attr_pcomp_en.attr && 1428 spi_support_ius(starget)) 1429 return TARGET_ATTRIBUTE_HELPER(pcomp_en); 1430 else if (attr == &dev_attr_hold_mcs.attr && 1431 spi_support_ius(starget)) 1432 return TARGET_ATTRIBUTE_HELPER(hold_mcs); 1433 else if (attr == &dev_attr_revalidate.attr) 1434 return S_IWUSR; 1435 1436 return 0; 1437 } 1438 1439 static struct attribute *target_attributes[] = { 1440 &dev_attr_period.attr, 1441 &dev_attr_min_period.attr, 1442 &dev_attr_offset.attr, 1443 &dev_attr_max_offset.attr, 1444 &dev_attr_width.attr, 1445 &dev_attr_max_width.attr, 1446 &dev_attr_iu.attr, 1447 &dev_attr_dt.attr, 1448 &dev_attr_qas.attr, 1449 &dev_attr_wr_flow.attr, 1450 &dev_attr_rd_strm.attr, 1451 &dev_attr_rti.attr, 1452 &dev_attr_pcomp_en.attr, 1453 &dev_attr_hold_mcs.attr, 1454 &dev_attr_revalidate.attr, 1455 NULL 1456 }; 1457 1458 static struct attribute_group target_attribute_group = { 1459 .attrs = target_attributes, 1460 .is_visible = target_attribute_is_visible, 1461 }; 1462 1463 static int spi_target_configure(struct transport_container *tc, 1464 struct device *dev, 1465 struct device *cdev) 1466 { 1467 struct kobject *kobj = &cdev->kobj; 1468 1469 /* force an update based on parameters read from the device */ 1470 sysfs_update_group(kobj, &target_attribute_group); 1471 1472 return 0; 1473 } 1474 1475 struct scsi_transport_template * 1476 spi_attach_transport(struct spi_function_template *ft) 1477 { 1478 struct spi_internal *i = kzalloc(sizeof(struct spi_internal), 1479 GFP_KERNEL); 1480 1481 if (unlikely(!i)) 1482 return NULL; 1483 1484 i->t.target_attrs.ac.class = &spi_transport_class.class; 1485 i->t.target_attrs.ac.grp = &target_attribute_group; 1486 i->t.target_attrs.ac.match = spi_target_match; 1487 transport_container_register(&i->t.target_attrs); 1488 i->t.target_size = sizeof(struct spi_transport_attrs); 1489 i->t.host_attrs.ac.class = &spi_host_class.class; 1490 i->t.host_attrs.ac.grp = &host_attribute_group; 1491 i->t.host_attrs.ac.match = spi_host_match; 1492 transport_container_register(&i->t.host_attrs); 1493 i->t.host_size = sizeof(struct spi_host_attrs); 1494 i->f = ft; 1495 1496 return &i->t; 1497 } 1498 EXPORT_SYMBOL(spi_attach_transport); 1499 1500 void spi_release_transport(struct scsi_transport_template *t) 1501 { 1502 struct spi_internal *i = to_spi_internal(t); 1503 1504 transport_container_unregister(&i->t.target_attrs); 1505 transport_container_unregister(&i->t.host_attrs); 1506 1507 kfree(i); 1508 } 1509 EXPORT_SYMBOL(spi_release_transport); 1510 1511 static __init int spi_transport_init(void) 1512 { 1513 int error = transport_class_register(&spi_transport_class); 1514 if (error) 1515 return error; 1516 error = anon_transport_class_register(&spi_device_class); 1517 return transport_class_register(&spi_host_class); 1518 } 1519 1520 static void __exit spi_transport_exit(void) 1521 { 1522 transport_class_unregister(&spi_transport_class); 1523 anon_transport_class_unregister(&spi_device_class); 1524 transport_class_unregister(&spi_host_class); 1525 } 1526 1527 MODULE_AUTHOR("Martin Hicks"); 1528 MODULE_DESCRIPTION("SPI Transport Attributes"); 1529 MODULE_LICENSE("GPL"); 1530 1531 module_init(spi_transport_init); 1532 module_exit(spi_transport_exit); 1533