1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Parallel SCSI (SPI) transport specific attributes exported to sysfs. 4 * 5 * Copyright (c) 2003 Silicon Graphics, Inc. All rights reserved. 6 * Copyright (c) 2004, 2005 James Bottomley <James.Bottomley@SteelEye.com> 7 */ 8 #include <linux/ctype.h> 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/workqueue.h> 12 #include <linux/blkdev.h> 13 #include <linux/mutex.h> 14 #include <linux/sysfs.h> 15 #include <linux/slab.h> 16 #include <linux/suspend.h> 17 #include <scsi/scsi.h> 18 #include "scsi_priv.h" 19 #include <scsi/scsi_device.h> 20 #include <scsi/scsi_host.h> 21 #include <scsi/scsi_cmnd.h> 22 #include <scsi/scsi_eh.h> 23 #include <scsi/scsi_tcq.h> 24 #include <scsi/scsi_transport.h> 25 #include <scsi/scsi_transport_spi.h> 26 27 #define SPI_NUM_ATTRS 14 /* increase this if you add attributes */ 28 #define SPI_OTHER_ATTRS 1 /* Increase this if you add "always 29 * on" attributes */ 30 #define SPI_HOST_ATTRS 1 31 32 #define SPI_MAX_ECHO_BUFFER_SIZE 4096 33 34 #define DV_LOOPS 3 35 #define DV_TIMEOUT (10*HZ) 36 #define DV_RETRIES 3 /* should only need at most 37 * two cc/ua clears */ 38 39 /* Our blacklist flags */ 40 enum { 41 SPI_BLIST_NOIUS = (__force blist_flags_t)0x1, 42 }; 43 44 /* blacklist table, modelled on scsi_devinfo.c */ 45 static struct { 46 char *vendor; 47 char *model; 48 blist_flags_t flags; 49 } spi_static_device_list[] __initdata = { 50 {"HP", "Ultrium 3-SCSI", SPI_BLIST_NOIUS }, 51 {"IBM", "ULTRIUM-TD3", SPI_BLIST_NOIUS }, 52 {NULL, NULL, 0} 53 }; 54 55 /* Private data accessors (keep these out of the header file) */ 56 #define spi_dv_in_progress(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_in_progress) 57 #define spi_dv_mutex(x) (((struct spi_transport_attrs *)&(x)->starget_data)->dv_mutex) 58 59 struct spi_internal { 60 struct scsi_transport_template t; 61 struct spi_function_template *f; 62 }; 63 64 #define to_spi_internal(tmpl) container_of(tmpl, struct spi_internal, t) 65 66 static const int ppr_to_ps[] = { 67 /* The PPR values 0-6 are reserved, fill them in when 68 * the committee defines them */ 69 -1, /* 0x00 */ 70 -1, /* 0x01 */ 71 -1, /* 0x02 */ 72 -1, /* 0x03 */ 73 -1, /* 0x04 */ 74 -1, /* 0x05 */ 75 -1, /* 0x06 */ 76 3125, /* 0x07 */ 77 6250, /* 0x08 */ 78 12500, /* 0x09 */ 79 25000, /* 0x0a */ 80 30300, /* 0x0b */ 81 50000, /* 0x0c */ 82 }; 83 /* The PPR values at which you calculate the period in ns by multiplying 84 * by 4 */ 85 #define SPI_STATIC_PPR 0x0c 86 87 static int sprint_frac(char *dest, int value, int denom) 88 { 89 int frac = value % denom; 90 int result = sprintf(dest, "%d", value / denom); 91 92 if (frac == 0) 93 return result; 94 dest[result++] = '.'; 95 96 do { 97 denom /= 10; 98 sprintf(dest + result, "%d", frac / denom); 99 result++; 100 frac %= denom; 101 } while (frac); 102 103 dest[result++] = '\0'; 104 return result; 105 } 106 107 static int spi_execute(struct scsi_device *sdev, const void *cmd, 108 enum req_op op, void *buffer, unsigned int bufflen, 109 struct scsi_sense_hdr *sshdr) 110 { 111 int i, result; 112 struct scsi_sense_hdr sshdr_tmp; 113 blk_opf_t opf = op | REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | 114 REQ_FAILFAST_DRIVER; 115 const struct scsi_exec_args exec_args = { 116 .req_flags = BLK_MQ_REQ_PM, 117 .sshdr = sshdr ? : &sshdr_tmp, 118 }; 119 120 sshdr = exec_args.sshdr; 121 122 for(i = 0; i < DV_RETRIES; i++) { 123 /* 124 * The purpose of the RQF_PM flag below is to bypass the 125 * SDEV_QUIESCE state. 126 */ 127 result = scsi_execute_cmd(sdev, cmd, opf, buffer, bufflen, 128 DV_TIMEOUT, 1, &exec_args); 129 if (result < 0 || !scsi_sense_valid(sshdr) || 130 sshdr->sense_key != UNIT_ATTENTION) 131 break; 132 } 133 return result; 134 } 135 136 static struct { 137 enum spi_signal_type value; 138 char *name; 139 } signal_types[] = { 140 { SPI_SIGNAL_UNKNOWN, "unknown" }, 141 { SPI_SIGNAL_SE, "SE" }, 142 { SPI_SIGNAL_LVD, "LVD" }, 143 { SPI_SIGNAL_HVD, "HVD" }, 144 }; 145 146 static inline const char *spi_signal_to_string(enum spi_signal_type type) 147 { 148 int i; 149 150 for (i = 0; i < ARRAY_SIZE(signal_types); i++) { 151 if (type == signal_types[i].value) 152 return signal_types[i].name; 153 } 154 return NULL; 155 } 156 static inline enum spi_signal_type spi_signal_to_value(const char *name) 157 { 158 int i, len; 159 160 for (i = 0; i < ARRAY_SIZE(signal_types); i++) { 161 len = strlen(signal_types[i].name); 162 if (strncmp(name, signal_types[i].name, len) == 0 && 163 (name[len] == '\n' || name[len] == '\0')) 164 return signal_types[i].value; 165 } 166 return SPI_SIGNAL_UNKNOWN; 167 } 168 169 static int spi_host_setup(struct transport_container *tc, struct device *dev, 170 struct device *cdev) 171 { 172 struct Scsi_Host *shost = dev_to_shost(dev); 173 174 spi_signalling(shost) = SPI_SIGNAL_UNKNOWN; 175 176 return 0; 177 } 178 179 static int spi_host_configure(struct transport_container *tc, 180 struct device *dev, 181 struct device *cdev); 182 183 static DECLARE_TRANSPORT_CLASS(spi_host_class, 184 "spi_host", 185 spi_host_setup, 186 NULL, 187 spi_host_configure); 188 189 static int spi_host_match(struct attribute_container *cont, 190 struct device *dev) 191 { 192 struct Scsi_Host *shost; 193 194 if (!scsi_is_host_device(dev)) 195 return 0; 196 197 shost = dev_to_shost(dev); 198 if (!shost->transportt || shost->transportt->host_attrs.ac.class 199 != &spi_host_class.class) 200 return 0; 201 202 return &shost->transportt->host_attrs.ac == cont; 203 } 204 205 static int spi_target_configure(struct transport_container *tc, 206 struct device *dev, 207 struct device *cdev); 208 209 static int spi_device_configure(struct transport_container *tc, 210 struct device *dev, 211 struct device *cdev) 212 { 213 struct scsi_device *sdev = to_scsi_device(dev); 214 struct scsi_target *starget = sdev->sdev_target; 215 blist_flags_t bflags; 216 217 bflags = scsi_get_device_flags_keyed(sdev, &sdev->inquiry[8], 218 &sdev->inquiry[16], 219 SCSI_DEVINFO_SPI); 220 221 /* Populate the target capability fields with the values 222 * gleaned from the device inquiry */ 223 224 spi_support_sync(starget) = scsi_device_sync(sdev); 225 spi_support_wide(starget) = scsi_device_wide(sdev); 226 spi_support_dt(starget) = scsi_device_dt(sdev); 227 spi_support_dt_only(starget) = scsi_device_dt_only(sdev); 228 spi_support_ius(starget) = scsi_device_ius(sdev); 229 if (bflags & SPI_BLIST_NOIUS) { 230 dev_info(dev, "Information Units disabled by blacklist\n"); 231 spi_support_ius(starget) = 0; 232 } 233 spi_support_qas(starget) = scsi_device_qas(sdev); 234 235 return 0; 236 } 237 238 static int spi_setup_transport_attrs(struct transport_container *tc, 239 struct device *dev, 240 struct device *cdev) 241 { 242 struct scsi_target *starget = to_scsi_target(dev); 243 244 spi_period(starget) = -1; /* illegal value */ 245 spi_min_period(starget) = 0; 246 spi_offset(starget) = 0; /* async */ 247 spi_max_offset(starget) = 255; 248 spi_width(starget) = 0; /* narrow */ 249 spi_max_width(starget) = 1; 250 spi_iu(starget) = 0; /* no IU */ 251 spi_max_iu(starget) = 1; 252 spi_dt(starget) = 0; /* ST */ 253 spi_qas(starget) = 0; 254 spi_max_qas(starget) = 1; 255 spi_wr_flow(starget) = 0; 256 spi_rd_strm(starget) = 0; 257 spi_rti(starget) = 0; 258 spi_pcomp_en(starget) = 0; 259 spi_hold_mcs(starget) = 0; 260 spi_dv_pending(starget) = 0; 261 spi_dv_in_progress(starget) = 0; 262 spi_initial_dv(starget) = 0; 263 mutex_init(&spi_dv_mutex(starget)); 264 265 return 0; 266 } 267 268 #define spi_transport_show_simple(field, format_string) \ 269 \ 270 static ssize_t \ 271 show_spi_transport_##field(struct device *dev, \ 272 struct device_attribute *attr, char *buf) \ 273 { \ 274 struct scsi_target *starget = transport_class_to_starget(dev); \ 275 struct spi_transport_attrs *tp; \ 276 \ 277 tp = (struct spi_transport_attrs *)&starget->starget_data; \ 278 return snprintf(buf, 20, format_string, tp->field); \ 279 } 280 281 #define spi_transport_store_simple(field, format_string) \ 282 \ 283 static ssize_t \ 284 store_spi_transport_##field(struct device *dev, \ 285 struct device_attribute *attr, \ 286 const char *buf, size_t count) \ 287 { \ 288 int val; \ 289 struct scsi_target *starget = transport_class_to_starget(dev); \ 290 struct spi_transport_attrs *tp; \ 291 \ 292 tp = (struct spi_transport_attrs *)&starget->starget_data; \ 293 val = simple_strtoul(buf, NULL, 0); \ 294 tp->field = val; \ 295 return count; \ 296 } 297 298 #define spi_transport_show_function(field, format_string) \ 299 \ 300 static ssize_t \ 301 show_spi_transport_##field(struct device *dev, \ 302 struct device_attribute *attr, char *buf) \ 303 { \ 304 struct scsi_target *starget = transport_class_to_starget(dev); \ 305 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ 306 struct spi_transport_attrs *tp; \ 307 struct spi_internal *i = to_spi_internal(shost->transportt); \ 308 tp = (struct spi_transport_attrs *)&starget->starget_data; \ 309 if (i->f->get_##field) \ 310 i->f->get_##field(starget); \ 311 return snprintf(buf, 20, format_string, tp->field); \ 312 } 313 314 #define spi_transport_store_function(field, format_string) \ 315 static ssize_t \ 316 store_spi_transport_##field(struct device *dev, \ 317 struct device_attribute *attr, \ 318 const char *buf, size_t count) \ 319 { \ 320 int val; \ 321 struct scsi_target *starget = transport_class_to_starget(dev); \ 322 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ 323 struct spi_internal *i = to_spi_internal(shost->transportt); \ 324 \ 325 if (!i->f->set_##field) \ 326 return -EINVAL; \ 327 val = simple_strtoul(buf, NULL, 0); \ 328 i->f->set_##field(starget, val); \ 329 return count; \ 330 } 331 332 #define spi_transport_store_max(field, format_string) \ 333 static ssize_t \ 334 store_spi_transport_##field(struct device *dev, \ 335 struct device_attribute *attr, \ 336 const char *buf, size_t count) \ 337 { \ 338 int val; \ 339 struct scsi_target *starget = transport_class_to_starget(dev); \ 340 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); \ 341 struct spi_internal *i = to_spi_internal(shost->transportt); \ 342 struct spi_transport_attrs *tp \ 343 = (struct spi_transport_attrs *)&starget->starget_data; \ 344 \ 345 if (!i->f->set_##field) \ 346 return -EINVAL; \ 347 val = simple_strtoul(buf, NULL, 0); \ 348 if (val > tp->max_##field) \ 349 val = tp->max_##field; \ 350 i->f->set_##field(starget, val); \ 351 return count; \ 352 } 353 354 #define spi_transport_rd_attr(field, format_string) \ 355 spi_transport_show_function(field, format_string) \ 356 spi_transport_store_function(field, format_string) \ 357 static DEVICE_ATTR(field, S_IRUGO, \ 358 show_spi_transport_##field, \ 359 store_spi_transport_##field); 360 361 #define spi_transport_simple_attr(field, format_string) \ 362 spi_transport_show_simple(field, format_string) \ 363 spi_transport_store_simple(field, format_string) \ 364 static DEVICE_ATTR(field, S_IRUGO, \ 365 show_spi_transport_##field, \ 366 store_spi_transport_##field); 367 368 #define spi_transport_max_attr(field, format_string) \ 369 spi_transport_show_function(field, format_string) \ 370 spi_transport_store_max(field, format_string) \ 371 spi_transport_simple_attr(max_##field, format_string) \ 372 static DEVICE_ATTR(field, S_IRUGO, \ 373 show_spi_transport_##field, \ 374 store_spi_transport_##field); 375 376 /* The Parallel SCSI Tranport Attributes: */ 377 spi_transport_max_attr(offset, "%d\n"); 378 spi_transport_max_attr(width, "%d\n"); 379 spi_transport_max_attr(iu, "%d\n"); 380 spi_transport_rd_attr(dt, "%d\n"); 381 spi_transport_max_attr(qas, "%d\n"); 382 spi_transport_rd_attr(wr_flow, "%d\n"); 383 spi_transport_rd_attr(rd_strm, "%d\n"); 384 spi_transport_rd_attr(rti, "%d\n"); 385 spi_transport_rd_attr(pcomp_en, "%d\n"); 386 spi_transport_rd_attr(hold_mcs, "%d\n"); 387 388 /* we only care about the first child device that's a real SCSI device 389 * so we return 1 to terminate the iteration when we find it */ 390 static int child_iter(struct device *dev, void *data) 391 { 392 if (!scsi_is_sdev_device(dev)) 393 return 0; 394 395 spi_dv_device(to_scsi_device(dev)); 396 return 1; 397 } 398 399 static ssize_t 400 store_spi_revalidate(struct device *dev, struct device_attribute *attr, 401 const char *buf, size_t count) 402 { 403 struct scsi_target *starget = transport_class_to_starget(dev); 404 405 device_for_each_child(&starget->dev, NULL, child_iter); 406 return count; 407 } 408 static DEVICE_ATTR(revalidate, S_IWUSR, NULL, store_spi_revalidate); 409 410 /* Translate the period into ns according to the current spec 411 * for SDTR/PPR messages */ 412 static int period_to_str(char *buf, int period) 413 { 414 int len, picosec; 415 416 if (period < 0 || period > 0xff) { 417 picosec = -1; 418 } else if (period <= SPI_STATIC_PPR) { 419 picosec = ppr_to_ps[period]; 420 } else { 421 picosec = period * 4000; 422 } 423 424 if (picosec == -1) { 425 len = sprintf(buf, "reserved"); 426 } else { 427 len = sprint_frac(buf, picosec, 1000); 428 } 429 430 return len; 431 } 432 433 static ssize_t 434 show_spi_transport_period_helper(char *buf, int period) 435 { 436 int len = period_to_str(buf, period); 437 buf[len++] = '\n'; 438 buf[len] = '\0'; 439 return len; 440 } 441 442 static ssize_t 443 store_spi_transport_period_helper(struct device *dev, const char *buf, 444 size_t count, int *periodp) 445 { 446 int j, picosec, period = -1; 447 char *endp; 448 449 picosec = simple_strtoul(buf, &endp, 10) * 1000; 450 if (*endp == '.') { 451 int mult = 100; 452 do { 453 endp++; 454 if (!isdigit(*endp)) 455 break; 456 picosec += (*endp - '0') * mult; 457 mult /= 10; 458 } while (mult > 0); 459 } 460 461 for (j = 0; j <= SPI_STATIC_PPR; j++) { 462 if (ppr_to_ps[j] < picosec) 463 continue; 464 period = j; 465 break; 466 } 467 468 if (period == -1) 469 period = picosec / 4000; 470 471 if (period > 0xff) 472 period = 0xff; 473 474 *periodp = period; 475 476 return count; 477 } 478 479 static ssize_t 480 show_spi_transport_period(struct device *dev, 481 struct device_attribute *attr, char *buf) 482 { 483 struct scsi_target *starget = transport_class_to_starget(dev); 484 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 485 struct spi_internal *i = to_spi_internal(shost->transportt); 486 struct spi_transport_attrs *tp = 487 (struct spi_transport_attrs *)&starget->starget_data; 488 489 if (i->f->get_period) 490 i->f->get_period(starget); 491 492 return show_spi_transport_period_helper(buf, tp->period); 493 } 494 495 static ssize_t 496 store_spi_transport_period(struct device *cdev, struct device_attribute *attr, 497 const char *buf, size_t count) 498 { 499 struct scsi_target *starget = transport_class_to_starget(cdev); 500 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 501 struct spi_internal *i = to_spi_internal(shost->transportt); 502 struct spi_transport_attrs *tp = 503 (struct spi_transport_attrs *)&starget->starget_data; 504 int period, retval; 505 506 if (!i->f->set_period) 507 return -EINVAL; 508 509 retval = store_spi_transport_period_helper(cdev, buf, count, &period); 510 511 if (period < tp->min_period) 512 period = tp->min_period; 513 514 i->f->set_period(starget, period); 515 516 return retval; 517 } 518 519 static DEVICE_ATTR(period, S_IRUGO, 520 show_spi_transport_period, 521 store_spi_transport_period); 522 523 static ssize_t 524 show_spi_transport_min_period(struct device *cdev, 525 struct device_attribute *attr, char *buf) 526 { 527 struct scsi_target *starget = transport_class_to_starget(cdev); 528 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 529 struct spi_internal *i = to_spi_internal(shost->transportt); 530 struct spi_transport_attrs *tp = 531 (struct spi_transport_attrs *)&starget->starget_data; 532 533 if (!i->f->set_period) 534 return -EINVAL; 535 536 return show_spi_transport_period_helper(buf, tp->min_period); 537 } 538 539 static ssize_t 540 store_spi_transport_min_period(struct device *cdev, 541 struct device_attribute *attr, 542 const char *buf, size_t count) 543 { 544 struct scsi_target *starget = transport_class_to_starget(cdev); 545 struct spi_transport_attrs *tp = 546 (struct spi_transport_attrs *)&starget->starget_data; 547 548 return store_spi_transport_period_helper(cdev, buf, count, 549 &tp->min_period); 550 } 551 552 553 static DEVICE_ATTR(min_period, S_IRUGO, 554 show_spi_transport_min_period, 555 store_spi_transport_min_period); 556 557 558 static ssize_t show_spi_host_signalling(struct device *cdev, 559 struct device_attribute *attr, 560 char *buf) 561 { 562 struct Scsi_Host *shost = transport_class_to_shost(cdev); 563 struct spi_internal *i = to_spi_internal(shost->transportt); 564 565 if (i->f->get_signalling) 566 i->f->get_signalling(shost); 567 568 return sprintf(buf, "%s\n", spi_signal_to_string(spi_signalling(shost))); 569 } 570 static ssize_t store_spi_host_signalling(struct device *dev, 571 struct device_attribute *attr, 572 const char *buf, size_t count) 573 { 574 struct Scsi_Host *shost = transport_class_to_shost(dev); 575 struct spi_internal *i = to_spi_internal(shost->transportt); 576 enum spi_signal_type type = spi_signal_to_value(buf); 577 578 if (!i->f->set_signalling) 579 return -EINVAL; 580 581 if (type != SPI_SIGNAL_UNKNOWN) 582 i->f->set_signalling(shost, type); 583 584 return count; 585 } 586 static DEVICE_ATTR(signalling, S_IRUGO, 587 show_spi_host_signalling, 588 store_spi_host_signalling); 589 590 static ssize_t show_spi_host_width(struct device *cdev, 591 struct device_attribute *attr, 592 char *buf) 593 { 594 struct Scsi_Host *shost = transport_class_to_shost(cdev); 595 596 return sprintf(buf, "%s\n", shost->max_id == 16 ? "wide" : "narrow"); 597 } 598 static DEVICE_ATTR(host_width, S_IRUGO, 599 show_spi_host_width, NULL); 600 601 static ssize_t show_spi_host_hba_id(struct device *cdev, 602 struct device_attribute *attr, 603 char *buf) 604 { 605 struct Scsi_Host *shost = transport_class_to_shost(cdev); 606 607 return sprintf(buf, "%d\n", shost->this_id); 608 } 609 static DEVICE_ATTR(hba_id, S_IRUGO, 610 show_spi_host_hba_id, NULL); 611 612 #define DV_SET(x, y) \ 613 if(i->f->set_##x) \ 614 i->f->set_##x(sdev->sdev_target, y) 615 616 enum spi_compare_returns { 617 SPI_COMPARE_SUCCESS, 618 SPI_COMPARE_FAILURE, 619 SPI_COMPARE_SKIP_TEST, 620 }; 621 622 623 /* This is for read/write Domain Validation: If the device supports 624 * an echo buffer, we do read/write tests to it */ 625 static enum spi_compare_returns 626 spi_dv_device_echo_buffer(struct scsi_device *sdev, u8 *buffer, 627 u8 *ptr, const int retries) 628 { 629 int len = ptr - buffer; 630 int j, k, r, result; 631 unsigned int pattern = 0x0000ffff; 632 struct scsi_sense_hdr sshdr; 633 634 const char spi_write_buffer[] = { 635 WRITE_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 636 }; 637 const char spi_read_buffer[] = { 638 READ_BUFFER, 0x0a, 0, 0, 0, 0, 0, len >> 8, len & 0xff, 0 639 }; 640 641 /* set up the pattern buffer. Doesn't matter if we spill 642 * slightly beyond since that's where the read buffer is */ 643 for (j = 0; j < len; ) { 644 645 /* fill the buffer with counting (test a) */ 646 for ( ; j < min(len, 32); j++) 647 buffer[j] = j; 648 k = j; 649 /* fill the buffer with alternating words of 0x0 and 650 * 0xffff (test b) */ 651 for ( ; j < min(len, k + 32); j += 2) { 652 u16 *word = (u16 *)&buffer[j]; 653 654 *word = (j & 0x02) ? 0x0000 : 0xffff; 655 } 656 k = j; 657 /* fill with crosstalk (alternating 0x5555 0xaaa) 658 * (test c) */ 659 for ( ; j < min(len, k + 32); j += 2) { 660 u16 *word = (u16 *)&buffer[j]; 661 662 *word = (j & 0x02) ? 0x5555 : 0xaaaa; 663 } 664 k = j; 665 /* fill with shifting bits (test d) */ 666 for ( ; j < min(len, k + 32); j += 4) { 667 u32 *word = (unsigned int *)&buffer[j]; 668 u32 roll = (pattern & 0x80000000) ? 1 : 0; 669 670 *word = pattern; 671 pattern = (pattern << 1) | roll; 672 } 673 /* don't bother with random data (test e) */ 674 } 675 676 for (r = 0; r < retries; r++) { 677 result = spi_execute(sdev, spi_write_buffer, REQ_OP_DRV_OUT, 678 buffer, len, &sshdr); 679 if(result || !scsi_device_online(sdev)) { 680 681 scsi_device_set_state(sdev, SDEV_QUIESCE); 682 if (scsi_sense_valid(&sshdr) 683 && sshdr.sense_key == ILLEGAL_REQUEST 684 /* INVALID FIELD IN CDB */ 685 && sshdr.asc == 0x24 && sshdr.ascq == 0x00) 686 /* This would mean that the drive lied 687 * to us about supporting an echo 688 * buffer (unfortunately some Western 689 * Digital drives do precisely this) 690 */ 691 return SPI_COMPARE_SKIP_TEST; 692 693 694 sdev_printk(KERN_ERR, sdev, "Write Buffer failure %x\n", result); 695 return SPI_COMPARE_FAILURE; 696 } 697 698 memset(ptr, 0, len); 699 spi_execute(sdev, spi_read_buffer, REQ_OP_DRV_IN, 700 ptr, len, NULL); 701 scsi_device_set_state(sdev, SDEV_QUIESCE); 702 703 if (memcmp(buffer, ptr, len) != 0) 704 return SPI_COMPARE_FAILURE; 705 } 706 return SPI_COMPARE_SUCCESS; 707 } 708 709 /* This is for the simplest form of Domain Validation: a read test 710 * on the inquiry data from the device */ 711 static enum spi_compare_returns 712 spi_dv_device_compare_inquiry(struct scsi_device *sdev, u8 *buffer, 713 u8 *ptr, const int retries) 714 { 715 int r, result; 716 const int len = sdev->inquiry_len; 717 const char spi_inquiry[] = { 718 INQUIRY, 0, 0, 0, len, 0 719 }; 720 721 for (r = 0; r < retries; r++) { 722 memset(ptr, 0, len); 723 724 result = spi_execute(sdev, spi_inquiry, REQ_OP_DRV_IN, 725 ptr, len, NULL); 726 727 if(result || !scsi_device_online(sdev)) { 728 scsi_device_set_state(sdev, SDEV_QUIESCE); 729 return SPI_COMPARE_FAILURE; 730 } 731 732 /* If we don't have the inquiry data already, the 733 * first read gets it */ 734 if (ptr == buffer) { 735 ptr += len; 736 --r; 737 continue; 738 } 739 740 if (memcmp(buffer, ptr, len) != 0) 741 /* failure */ 742 return SPI_COMPARE_FAILURE; 743 } 744 return SPI_COMPARE_SUCCESS; 745 } 746 747 static enum spi_compare_returns 748 spi_dv_retrain(struct scsi_device *sdev, u8 *buffer, u8 *ptr, 749 enum spi_compare_returns 750 (*compare_fn)(struct scsi_device *, u8 *, u8 *, int)) 751 { 752 struct spi_internal *i = to_spi_internal(sdev->host->transportt); 753 struct scsi_target *starget = sdev->sdev_target; 754 int period = 0, prevperiod = 0; 755 enum spi_compare_returns retval; 756 757 758 for (;;) { 759 int newperiod; 760 retval = compare_fn(sdev, buffer, ptr, DV_LOOPS); 761 762 if (retval == SPI_COMPARE_SUCCESS 763 || retval == SPI_COMPARE_SKIP_TEST) 764 break; 765 766 /* OK, retrain, fallback */ 767 if (i->f->get_iu) 768 i->f->get_iu(starget); 769 if (i->f->get_qas) 770 i->f->get_qas(starget); 771 if (i->f->get_period) 772 i->f->get_period(sdev->sdev_target); 773 774 /* Here's the fallback sequence; first try turning off 775 * IU, then QAS (if we can control them), then finally 776 * fall down the periods */ 777 if (i->f->set_iu && spi_iu(starget)) { 778 starget_printk(KERN_ERR, starget, "Domain Validation Disabling Information Units\n"); 779 DV_SET(iu, 0); 780 } else if (i->f->set_qas && spi_qas(starget)) { 781 starget_printk(KERN_ERR, starget, "Domain Validation Disabling Quick Arbitration and Selection\n"); 782 DV_SET(qas, 0); 783 } else { 784 newperiod = spi_period(starget); 785 period = newperiod > period ? newperiod : period; 786 if (period < 0x0d) 787 period++; 788 else 789 period += period >> 1; 790 791 if (unlikely(period > 0xff || period == prevperiod)) { 792 /* Total failure; set to async and return */ 793 starget_printk(KERN_ERR, starget, "Domain Validation Failure, dropping back to Asynchronous\n"); 794 DV_SET(offset, 0); 795 return SPI_COMPARE_FAILURE; 796 } 797 starget_printk(KERN_ERR, starget, "Domain Validation detected failure, dropping back\n"); 798 DV_SET(period, period); 799 prevperiod = period; 800 } 801 } 802 return retval; 803 } 804 805 static int 806 spi_dv_device_get_echo_buffer(struct scsi_device *sdev, u8 *buffer) 807 { 808 int l, result; 809 810 /* first off do a test unit ready. This can error out 811 * because of reservations or some other reason. If it 812 * fails, the device won't let us write to the echo buffer 813 * so just return failure */ 814 815 static const char spi_test_unit_ready[] = { 816 TEST_UNIT_READY, 0, 0, 0, 0, 0 817 }; 818 819 static const char spi_read_buffer_descriptor[] = { 820 READ_BUFFER, 0x0b, 0, 0, 0, 0, 0, 0, 4, 0 821 }; 822 823 824 /* We send a set of three TURs to clear any outstanding 825 * unit attention conditions if they exist (Otherwise the 826 * buffer tests won't be happy). If the TUR still fails 827 * (reservation conflict, device not ready, etc) just 828 * skip the write tests */ 829 for (l = 0; ; l++) { 830 result = spi_execute(sdev, spi_test_unit_ready, REQ_OP_DRV_IN, 831 NULL, 0, NULL); 832 833 if(result) { 834 if(l >= 3) 835 return 0; 836 } else { 837 /* TUR succeeded */ 838 break; 839 } 840 } 841 842 result = spi_execute(sdev, spi_read_buffer_descriptor, 843 REQ_OP_DRV_IN, buffer, 4, NULL); 844 845 if (result) 846 /* Device has no echo buffer */ 847 return 0; 848 849 return buffer[3] + ((buffer[2] & 0x1f) << 8); 850 } 851 852 static void 853 spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer) 854 { 855 struct spi_internal *i = to_spi_internal(sdev->host->transportt); 856 struct scsi_target *starget = sdev->sdev_target; 857 struct Scsi_Host *shost = sdev->host; 858 int len = sdev->inquiry_len; 859 int min_period = spi_min_period(starget); 860 int max_width = spi_max_width(starget); 861 /* first set us up for narrow async */ 862 DV_SET(offset, 0); 863 DV_SET(width, 0); 864 865 if (spi_dv_device_compare_inquiry(sdev, buffer, buffer, DV_LOOPS) 866 != SPI_COMPARE_SUCCESS) { 867 starget_printk(KERN_ERR, starget, "Domain Validation Initial Inquiry Failed\n"); 868 /* FIXME: should probably offline the device here? */ 869 return; 870 } 871 872 if (!spi_support_wide(starget)) { 873 spi_max_width(starget) = 0; 874 max_width = 0; 875 } 876 877 /* test width */ 878 if (i->f->set_width && max_width) { 879 i->f->set_width(starget, 1); 880 881 if (spi_dv_device_compare_inquiry(sdev, buffer, 882 buffer + len, 883 DV_LOOPS) 884 != SPI_COMPARE_SUCCESS) { 885 starget_printk(KERN_ERR, starget, "Wide Transfers Fail\n"); 886 i->f->set_width(starget, 0); 887 /* Make sure we don't force wide back on by asking 888 * for a transfer period that requires it */ 889 max_width = 0; 890 if (min_period < 10) 891 min_period = 10; 892 } 893 } 894 895 if (!i->f->set_period) 896 return; 897 898 /* device can't handle synchronous */ 899 if (!spi_support_sync(starget) && !spi_support_dt(starget)) 900 return; 901 902 /* len == -1 is the signal that we need to ascertain the 903 * presence of an echo buffer before trying to use it. len == 904 * 0 means we don't have an echo buffer */ 905 len = -1; 906 907 retry: 908 909 /* now set up to the maximum */ 910 DV_SET(offset, spi_max_offset(starget)); 911 DV_SET(period, min_period); 912 913 /* try QAS requests; this should be harmless to set if the 914 * target supports it */ 915 if (spi_support_qas(starget) && spi_max_qas(starget)) { 916 DV_SET(qas, 1); 917 } else { 918 DV_SET(qas, 0); 919 } 920 921 if (spi_support_ius(starget) && spi_max_iu(starget) && 922 min_period < 9) { 923 /* This u320 (or u640). Set IU transfers */ 924 DV_SET(iu, 1); 925 /* Then set the optional parameters */ 926 DV_SET(rd_strm, 1); 927 DV_SET(wr_flow, 1); 928 DV_SET(rti, 1); 929 if (min_period == 8) 930 DV_SET(pcomp_en, 1); 931 } else { 932 DV_SET(iu, 0); 933 } 934 935 /* now that we've done all this, actually check the bus 936 * signal type (if known). Some devices are stupid on 937 * a SE bus and still claim they can try LVD only settings */ 938 if (i->f->get_signalling) 939 i->f->get_signalling(shost); 940 if (spi_signalling(shost) == SPI_SIGNAL_SE || 941 spi_signalling(shost) == SPI_SIGNAL_HVD || 942 !spi_support_dt(starget)) { 943 DV_SET(dt, 0); 944 } else { 945 DV_SET(dt, 1); 946 } 947 /* set width last because it will pull all the other 948 * parameters down to required values */ 949 DV_SET(width, max_width); 950 951 /* Do the read only INQUIRY tests */ 952 spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len, 953 spi_dv_device_compare_inquiry); 954 /* See if we actually managed to negotiate and sustain DT */ 955 if (i->f->get_dt) 956 i->f->get_dt(starget); 957 958 /* see if the device has an echo buffer. If it does we can do 959 * the SPI pattern write tests. Because of some broken 960 * devices, we *only* try this on a device that has actually 961 * negotiated DT */ 962 963 if (len == -1 && spi_dt(starget)) 964 len = spi_dv_device_get_echo_buffer(sdev, buffer); 965 966 if (len <= 0) { 967 starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n"); 968 return; 969 } 970 971 if (len > SPI_MAX_ECHO_BUFFER_SIZE) { 972 starget_printk(KERN_WARNING, starget, "Echo buffer size %d is too big, trimming to %d\n", len, SPI_MAX_ECHO_BUFFER_SIZE); 973 len = SPI_MAX_ECHO_BUFFER_SIZE; 974 } 975 976 if (spi_dv_retrain(sdev, buffer, buffer + len, 977 spi_dv_device_echo_buffer) 978 == SPI_COMPARE_SKIP_TEST) { 979 /* OK, the stupid drive can't do a write echo buffer 980 * test after all, fall back to the read tests */ 981 len = 0; 982 goto retry; 983 } 984 } 985 986 987 /** spi_dv_device - Do Domain Validation on the device 988 * @sdev: scsi device to validate 989 * 990 * Performs the domain validation on the given device in the 991 * current execution thread. Since DV operations may sleep, 992 * the current thread must have user context. Also no SCSI 993 * related locks that would deadlock I/O issued by the DV may 994 * be held. 995 */ 996 void 997 spi_dv_device(struct scsi_device *sdev) 998 { 999 struct scsi_target *starget = sdev->sdev_target; 1000 const int len = SPI_MAX_ECHO_BUFFER_SIZE*2; 1001 unsigned int sleep_flags; 1002 u8 *buffer; 1003 1004 /* 1005 * Because this function and the power management code both call 1006 * scsi_device_quiesce(), it is not safe to perform domain validation 1007 * while suspend or resume is in progress. Hence the 1008 * lock/unlock_system_sleep() calls. 1009 */ 1010 sleep_flags = lock_system_sleep(); 1011 1012 if (scsi_autopm_get_device(sdev)) 1013 goto unlock_system_sleep; 1014 1015 if (unlikely(spi_dv_in_progress(starget))) 1016 goto put_autopm; 1017 1018 if (unlikely(scsi_device_get(sdev))) 1019 goto put_autopm; 1020 1021 spi_dv_in_progress(starget) = 1; 1022 1023 buffer = kzalloc(len, GFP_KERNEL); 1024 1025 if (unlikely(!buffer)) 1026 goto put_sdev; 1027 1028 /* We need to verify that the actual device will quiesce; the 1029 * later target quiesce is just a nice to have */ 1030 if (unlikely(scsi_device_quiesce(sdev))) 1031 goto free_buffer; 1032 1033 scsi_target_quiesce(starget); 1034 1035 spi_dv_pending(starget) = 1; 1036 mutex_lock(&spi_dv_mutex(starget)); 1037 1038 starget_printk(KERN_INFO, starget, "Beginning Domain Validation\n"); 1039 1040 spi_dv_device_internal(sdev, buffer); 1041 1042 starget_printk(KERN_INFO, starget, "Ending Domain Validation\n"); 1043 1044 mutex_unlock(&spi_dv_mutex(starget)); 1045 spi_dv_pending(starget) = 0; 1046 1047 scsi_target_resume(starget); 1048 1049 spi_initial_dv(starget) = 1; 1050 1051 free_buffer: 1052 kfree(buffer); 1053 1054 put_sdev: 1055 spi_dv_in_progress(starget) = 0; 1056 scsi_device_put(sdev); 1057 put_autopm: 1058 scsi_autopm_put_device(sdev); 1059 1060 unlock_system_sleep: 1061 unlock_system_sleep(sleep_flags); 1062 } 1063 EXPORT_SYMBOL(spi_dv_device); 1064 1065 struct work_queue_wrapper { 1066 struct work_struct work; 1067 struct scsi_device *sdev; 1068 }; 1069 1070 static void 1071 spi_dv_device_work_wrapper(struct work_struct *work) 1072 { 1073 struct work_queue_wrapper *wqw = 1074 container_of(work, struct work_queue_wrapper, work); 1075 struct scsi_device *sdev = wqw->sdev; 1076 1077 kfree(wqw); 1078 spi_dv_device(sdev); 1079 spi_dv_pending(sdev->sdev_target) = 0; 1080 scsi_device_put(sdev); 1081 } 1082 1083 1084 /** 1085 * spi_schedule_dv_device - schedule domain validation to occur on the device 1086 * @sdev: The device to validate 1087 * 1088 * Identical to spi_dv_device() above, except that the DV will be 1089 * scheduled to occur in a workqueue later. All memory allocations 1090 * are atomic, so may be called from any context including those holding 1091 * SCSI locks. 1092 */ 1093 void 1094 spi_schedule_dv_device(struct scsi_device *sdev) 1095 { 1096 struct work_queue_wrapper *wqw = 1097 kmalloc(sizeof(struct work_queue_wrapper), GFP_ATOMIC); 1098 1099 if (unlikely(!wqw)) 1100 return; 1101 1102 if (unlikely(spi_dv_pending(sdev->sdev_target))) { 1103 kfree(wqw); 1104 return; 1105 } 1106 /* Set pending early (dv_device doesn't check it, only sets it) */ 1107 spi_dv_pending(sdev->sdev_target) = 1; 1108 if (unlikely(scsi_device_get(sdev))) { 1109 kfree(wqw); 1110 spi_dv_pending(sdev->sdev_target) = 0; 1111 return; 1112 } 1113 1114 INIT_WORK(&wqw->work, spi_dv_device_work_wrapper); 1115 wqw->sdev = sdev; 1116 1117 schedule_work(&wqw->work); 1118 } 1119 EXPORT_SYMBOL(spi_schedule_dv_device); 1120 1121 /** 1122 * spi_display_xfer_agreement - Print the current target transfer agreement 1123 * @starget: The target for which to display the agreement 1124 * 1125 * Each SPI port is required to maintain a transfer agreement for each 1126 * other port on the bus. This function prints a one-line summary of 1127 * the current agreement; more detailed information is available in sysfs. 1128 */ 1129 void spi_display_xfer_agreement(struct scsi_target *starget) 1130 { 1131 struct spi_transport_attrs *tp; 1132 tp = (struct spi_transport_attrs *)&starget->starget_data; 1133 1134 if (tp->offset > 0 && tp->period > 0) { 1135 unsigned int picosec, kb100; 1136 char *scsi = "FAST-?"; 1137 char tmp[8]; 1138 1139 if (tp->period <= SPI_STATIC_PPR) { 1140 picosec = ppr_to_ps[tp->period]; 1141 switch (tp->period) { 1142 case 7: scsi = "FAST-320"; break; 1143 case 8: scsi = "FAST-160"; break; 1144 case 9: scsi = "FAST-80"; break; 1145 case 10: 1146 case 11: scsi = "FAST-40"; break; 1147 case 12: scsi = "FAST-20"; break; 1148 } 1149 } else { 1150 picosec = tp->period * 4000; 1151 if (tp->period < 25) 1152 scsi = "FAST-20"; 1153 else if (tp->period < 50) 1154 scsi = "FAST-10"; 1155 else 1156 scsi = "FAST-5"; 1157 } 1158 1159 kb100 = (10000000 + picosec / 2) / picosec; 1160 if (tp->width) 1161 kb100 *= 2; 1162 sprint_frac(tmp, picosec, 1000); 1163 1164 dev_info(&starget->dev, 1165 "%s %sSCSI %d.%d MB/s %s%s%s%s%s%s%s%s (%s ns, offset %d)\n", 1166 scsi, tp->width ? "WIDE " : "", kb100/10, kb100 % 10, 1167 tp->dt ? "DT" : "ST", 1168 tp->iu ? " IU" : "", 1169 tp->qas ? " QAS" : "", 1170 tp->rd_strm ? " RDSTRM" : "", 1171 tp->rti ? " RTI" : "", 1172 tp->wr_flow ? " WRFLOW" : "", 1173 tp->pcomp_en ? " PCOMP" : "", 1174 tp->hold_mcs ? " HMCS" : "", 1175 tmp, tp->offset); 1176 } else { 1177 dev_info(&starget->dev, "%sasynchronous\n", 1178 tp->width ? "wide " : ""); 1179 } 1180 } 1181 EXPORT_SYMBOL(spi_display_xfer_agreement); 1182 1183 int spi_populate_width_msg(unsigned char *msg, int width) 1184 { 1185 msg[0] = EXTENDED_MESSAGE; 1186 msg[1] = 2; 1187 msg[2] = EXTENDED_WDTR; 1188 msg[3] = width; 1189 return 4; 1190 } 1191 EXPORT_SYMBOL_GPL(spi_populate_width_msg); 1192 1193 int spi_populate_sync_msg(unsigned char *msg, int period, int offset) 1194 { 1195 msg[0] = EXTENDED_MESSAGE; 1196 msg[1] = 3; 1197 msg[2] = EXTENDED_SDTR; 1198 msg[3] = period; 1199 msg[4] = offset; 1200 return 5; 1201 } 1202 EXPORT_SYMBOL_GPL(spi_populate_sync_msg); 1203 1204 int spi_populate_ppr_msg(unsigned char *msg, int period, int offset, 1205 int width, int options) 1206 { 1207 msg[0] = EXTENDED_MESSAGE; 1208 msg[1] = 6; 1209 msg[2] = EXTENDED_PPR; 1210 msg[3] = period; 1211 msg[4] = 0; 1212 msg[5] = offset; 1213 msg[6] = width; 1214 msg[7] = options; 1215 return 8; 1216 } 1217 EXPORT_SYMBOL_GPL(spi_populate_ppr_msg); 1218 1219 /** 1220 * spi_populate_tag_msg - place a tag message in a buffer 1221 * @msg: pointer to the area to place the tag 1222 * @cmd: pointer to the scsi command for the tag 1223 * 1224 * Notes: 1225 * designed to create the correct type of tag message for the 1226 * particular request. Returns the size of the tag message. 1227 * May return 0 if TCQ is disabled for this device. 1228 **/ 1229 int spi_populate_tag_msg(unsigned char *msg, struct scsi_cmnd *cmd) 1230 { 1231 if (cmd->flags & SCMD_TAGGED) { 1232 *msg++ = SIMPLE_QUEUE_TAG; 1233 *msg++ = scsi_cmd_to_rq(cmd)->tag; 1234 return 2; 1235 } 1236 1237 return 0; 1238 } 1239 EXPORT_SYMBOL_GPL(spi_populate_tag_msg); 1240 1241 #ifdef CONFIG_SCSI_CONSTANTS 1242 static const char * const one_byte_msgs[] = { 1243 /* 0x00 */ "Task Complete", NULL /* Extended Message */, "Save Pointers", 1244 /* 0x03 */ "Restore Pointers", "Disconnect", "Initiator Error", 1245 /* 0x06 */ "Abort Task Set", "Message Reject", "Nop", "Message Parity Error", 1246 /* 0x0a */ "Linked Command Complete", "Linked Command Complete w/flag", 1247 /* 0x0c */ "Target Reset", "Abort Task", "Clear Task Set", 1248 /* 0x0f */ "Initiate Recovery", "Release Recovery", 1249 /* 0x11 */ "Terminate Process", "Continue Task", "Target Transfer Disable", 1250 /* 0x14 */ NULL, NULL, "Clear ACA", "LUN Reset" 1251 }; 1252 1253 static const char * const two_byte_msgs[] = { 1254 /* 0x20 */ "Simple Queue Tag", "Head of Queue Tag", "Ordered Queue Tag", 1255 /* 0x23 */ "Ignore Wide Residue", "ACA" 1256 }; 1257 1258 static const char * const extended_msgs[] = { 1259 /* 0x00 */ "Modify Data Pointer", "Synchronous Data Transfer Request", 1260 /* 0x02 */ "SCSI-I Extended Identify", "Wide Data Transfer Request", 1261 /* 0x04 */ "Parallel Protocol Request", "Modify Bidirectional Data Pointer" 1262 }; 1263 1264 static void print_nego(const unsigned char *msg, int per, int off, int width) 1265 { 1266 if (per) { 1267 char buf[20]; 1268 period_to_str(buf, msg[per]); 1269 printk("period = %s ns ", buf); 1270 } 1271 1272 if (off) 1273 printk("offset = %d ", msg[off]); 1274 if (width) 1275 printk("width = %d ", 8 << msg[width]); 1276 } 1277 1278 static void print_ptr(const unsigned char *msg, int msb, const char *desc) 1279 { 1280 int ptr = (msg[msb] << 24) | (msg[msb+1] << 16) | (msg[msb+2] << 8) | 1281 msg[msb+3]; 1282 printk("%s = %d ", desc, ptr); 1283 } 1284 1285 int spi_print_msg(const unsigned char *msg) 1286 { 1287 int len = 1, i; 1288 if (msg[0] == EXTENDED_MESSAGE) { 1289 len = 2 + msg[1]; 1290 if (len == 2) 1291 len += 256; 1292 if (msg[2] < ARRAY_SIZE(extended_msgs)) 1293 printk ("%s ", extended_msgs[msg[2]]); 1294 else 1295 printk ("Extended Message, reserved code (0x%02x) ", 1296 (int) msg[2]); 1297 switch (msg[2]) { 1298 case EXTENDED_MODIFY_DATA_POINTER: 1299 print_ptr(msg, 3, "pointer"); 1300 break; 1301 case EXTENDED_SDTR: 1302 print_nego(msg, 3, 4, 0); 1303 break; 1304 case EXTENDED_WDTR: 1305 print_nego(msg, 0, 0, 3); 1306 break; 1307 case EXTENDED_PPR: 1308 print_nego(msg, 3, 5, 6); 1309 break; 1310 case EXTENDED_MODIFY_BIDI_DATA_PTR: 1311 print_ptr(msg, 3, "out"); 1312 print_ptr(msg, 7, "in"); 1313 break; 1314 default: 1315 for (i = 2; i < len; ++i) 1316 printk("%02x ", msg[i]); 1317 } 1318 /* Identify */ 1319 } else if (msg[0] & 0x80) { 1320 printk("Identify disconnect %sallowed %s %d ", 1321 (msg[0] & 0x40) ? "" : "not ", 1322 (msg[0] & 0x20) ? "target routine" : "lun", 1323 msg[0] & 0x7); 1324 /* Normal One byte */ 1325 } else if (msg[0] < 0x1f) { 1326 if (msg[0] < ARRAY_SIZE(one_byte_msgs) && one_byte_msgs[msg[0]]) 1327 printk("%s ", one_byte_msgs[msg[0]]); 1328 else 1329 printk("reserved (%02x) ", msg[0]); 1330 } else if (msg[0] == 0x55) { 1331 printk("QAS Request "); 1332 /* Two byte */ 1333 } else if (msg[0] <= 0x2f) { 1334 if ((msg[0] - 0x20) < ARRAY_SIZE(two_byte_msgs)) 1335 printk("%s %02x ", two_byte_msgs[msg[0] - 0x20], 1336 msg[1]); 1337 else 1338 printk("reserved two byte (%02x %02x) ", 1339 msg[0], msg[1]); 1340 len = 2; 1341 } else 1342 printk("reserved "); 1343 return len; 1344 } 1345 EXPORT_SYMBOL(spi_print_msg); 1346 1347 #else /* ifndef CONFIG_SCSI_CONSTANTS */ 1348 1349 int spi_print_msg(const unsigned char *msg) 1350 { 1351 int len = 1, i; 1352 1353 if (msg[0] == EXTENDED_MESSAGE) { 1354 len = 2 + msg[1]; 1355 if (len == 2) 1356 len += 256; 1357 for (i = 0; i < len; ++i) 1358 printk("%02x ", msg[i]); 1359 /* Identify */ 1360 } else if (msg[0] & 0x80) { 1361 printk("%02x ", msg[0]); 1362 /* Normal One byte */ 1363 } else if ((msg[0] < 0x1f) || (msg[0] == 0x55)) { 1364 printk("%02x ", msg[0]); 1365 /* Two byte */ 1366 } else if (msg[0] <= 0x2f) { 1367 printk("%02x %02x", msg[0], msg[1]); 1368 len = 2; 1369 } else 1370 printk("%02x ", msg[0]); 1371 return len; 1372 } 1373 EXPORT_SYMBOL(spi_print_msg); 1374 #endif /* ! CONFIG_SCSI_CONSTANTS */ 1375 1376 static int spi_device_match(struct attribute_container *cont, 1377 struct device *dev) 1378 { 1379 struct scsi_device *sdev; 1380 struct Scsi_Host *shost; 1381 struct spi_internal *i; 1382 1383 if (!scsi_is_sdev_device(dev)) 1384 return 0; 1385 1386 sdev = to_scsi_device(dev); 1387 shost = sdev->host; 1388 if (!shost->transportt || shost->transportt->host_attrs.ac.class 1389 != &spi_host_class.class) 1390 return 0; 1391 /* Note: this class has no device attributes, so it has 1392 * no per-HBA allocation and thus we don't need to distinguish 1393 * the attribute containers for the device */ 1394 i = to_spi_internal(shost->transportt); 1395 if (i->f->deny_binding && i->f->deny_binding(sdev->sdev_target)) 1396 return 0; 1397 return 1; 1398 } 1399 1400 static int spi_target_match(struct attribute_container *cont, 1401 struct device *dev) 1402 { 1403 struct Scsi_Host *shost; 1404 struct scsi_target *starget; 1405 struct spi_internal *i; 1406 1407 if (!scsi_is_target_device(dev)) 1408 return 0; 1409 1410 shost = dev_to_shost(dev->parent); 1411 if (!shost->transportt || shost->transportt->host_attrs.ac.class 1412 != &spi_host_class.class) 1413 return 0; 1414 1415 i = to_spi_internal(shost->transportt); 1416 starget = to_scsi_target(dev); 1417 1418 if (i->f->deny_binding && i->f->deny_binding(starget)) 1419 return 0; 1420 1421 return &i->t.target_attrs.ac == cont; 1422 } 1423 1424 static DECLARE_TRANSPORT_CLASS(spi_transport_class, 1425 "spi_transport", 1426 spi_setup_transport_attrs, 1427 NULL, 1428 spi_target_configure); 1429 1430 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class, 1431 spi_device_match, 1432 spi_device_configure); 1433 1434 static struct attribute *host_attributes[] = { 1435 &dev_attr_signalling.attr, 1436 &dev_attr_host_width.attr, 1437 &dev_attr_hba_id.attr, 1438 NULL 1439 }; 1440 1441 static struct attribute_group host_attribute_group = { 1442 .attrs = host_attributes, 1443 }; 1444 1445 static int spi_host_configure(struct transport_container *tc, 1446 struct device *dev, 1447 struct device *cdev) 1448 { 1449 struct kobject *kobj = &cdev->kobj; 1450 struct Scsi_Host *shost = transport_class_to_shost(cdev); 1451 struct spi_internal *si = to_spi_internal(shost->transportt); 1452 struct attribute *attr = &dev_attr_signalling.attr; 1453 int rc = 0; 1454 1455 if (si->f->set_signalling) 1456 rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR); 1457 1458 return rc; 1459 } 1460 1461 /* returns true if we should be showing the variable. Also 1462 * overloads the return by setting 1<<1 if the attribute should 1463 * be writeable */ 1464 #define TARGET_ATTRIBUTE_HELPER(name) \ 1465 (si->f->show_##name ? S_IRUGO : 0) | \ 1466 (si->f->set_##name ? S_IWUSR : 0) 1467 1468 static umode_t target_attribute_is_visible(struct kobject *kobj, 1469 struct attribute *attr, int i) 1470 { 1471 struct device *cdev = container_of(kobj, struct device, kobj); 1472 struct scsi_target *starget = transport_class_to_starget(cdev); 1473 struct Scsi_Host *shost = transport_class_to_shost(cdev); 1474 struct spi_internal *si = to_spi_internal(shost->transportt); 1475 1476 if (attr == &dev_attr_period.attr && 1477 spi_support_sync(starget)) 1478 return TARGET_ATTRIBUTE_HELPER(period); 1479 else if (attr == &dev_attr_min_period.attr && 1480 spi_support_sync(starget)) 1481 return TARGET_ATTRIBUTE_HELPER(period); 1482 else if (attr == &dev_attr_offset.attr && 1483 spi_support_sync(starget)) 1484 return TARGET_ATTRIBUTE_HELPER(offset); 1485 else if (attr == &dev_attr_max_offset.attr && 1486 spi_support_sync(starget)) 1487 return TARGET_ATTRIBUTE_HELPER(offset); 1488 else if (attr == &dev_attr_width.attr && 1489 spi_support_wide(starget)) 1490 return TARGET_ATTRIBUTE_HELPER(width); 1491 else if (attr == &dev_attr_max_width.attr && 1492 spi_support_wide(starget)) 1493 return TARGET_ATTRIBUTE_HELPER(width); 1494 else if (attr == &dev_attr_iu.attr && 1495 spi_support_ius(starget)) 1496 return TARGET_ATTRIBUTE_HELPER(iu); 1497 else if (attr == &dev_attr_max_iu.attr && 1498 spi_support_ius(starget)) 1499 return TARGET_ATTRIBUTE_HELPER(iu); 1500 else if (attr == &dev_attr_dt.attr && 1501 spi_support_dt(starget)) 1502 return TARGET_ATTRIBUTE_HELPER(dt); 1503 else if (attr == &dev_attr_qas.attr && 1504 spi_support_qas(starget)) 1505 return TARGET_ATTRIBUTE_HELPER(qas); 1506 else if (attr == &dev_attr_max_qas.attr && 1507 spi_support_qas(starget)) 1508 return TARGET_ATTRIBUTE_HELPER(qas); 1509 else if (attr == &dev_attr_wr_flow.attr && 1510 spi_support_ius(starget)) 1511 return TARGET_ATTRIBUTE_HELPER(wr_flow); 1512 else if (attr == &dev_attr_rd_strm.attr && 1513 spi_support_ius(starget)) 1514 return TARGET_ATTRIBUTE_HELPER(rd_strm); 1515 else if (attr == &dev_attr_rti.attr && 1516 spi_support_ius(starget)) 1517 return TARGET_ATTRIBUTE_HELPER(rti); 1518 else if (attr == &dev_attr_pcomp_en.attr && 1519 spi_support_ius(starget)) 1520 return TARGET_ATTRIBUTE_HELPER(pcomp_en); 1521 else if (attr == &dev_attr_hold_mcs.attr && 1522 spi_support_ius(starget)) 1523 return TARGET_ATTRIBUTE_HELPER(hold_mcs); 1524 else if (attr == &dev_attr_revalidate.attr) 1525 return S_IWUSR; 1526 1527 return 0; 1528 } 1529 1530 static struct attribute *target_attributes[] = { 1531 &dev_attr_period.attr, 1532 &dev_attr_min_period.attr, 1533 &dev_attr_offset.attr, 1534 &dev_attr_max_offset.attr, 1535 &dev_attr_width.attr, 1536 &dev_attr_max_width.attr, 1537 &dev_attr_iu.attr, 1538 &dev_attr_max_iu.attr, 1539 &dev_attr_dt.attr, 1540 &dev_attr_qas.attr, 1541 &dev_attr_max_qas.attr, 1542 &dev_attr_wr_flow.attr, 1543 &dev_attr_rd_strm.attr, 1544 &dev_attr_rti.attr, 1545 &dev_attr_pcomp_en.attr, 1546 &dev_attr_hold_mcs.attr, 1547 &dev_attr_revalidate.attr, 1548 NULL 1549 }; 1550 1551 static struct attribute_group target_attribute_group = { 1552 .attrs = target_attributes, 1553 .is_visible = target_attribute_is_visible, 1554 }; 1555 1556 static int spi_target_configure(struct transport_container *tc, 1557 struct device *dev, 1558 struct device *cdev) 1559 { 1560 struct kobject *kobj = &cdev->kobj; 1561 1562 /* force an update based on parameters read from the device */ 1563 sysfs_update_group(kobj, &target_attribute_group); 1564 1565 return 0; 1566 } 1567 1568 struct scsi_transport_template * 1569 spi_attach_transport(struct spi_function_template *ft) 1570 { 1571 struct spi_internal *i = kzalloc(sizeof(struct spi_internal), 1572 GFP_KERNEL); 1573 1574 if (unlikely(!i)) 1575 return NULL; 1576 1577 i->t.target_attrs.ac.class = &spi_transport_class.class; 1578 i->t.target_attrs.ac.grp = &target_attribute_group; 1579 i->t.target_attrs.ac.match = spi_target_match; 1580 transport_container_register(&i->t.target_attrs); 1581 i->t.target_size = sizeof(struct spi_transport_attrs); 1582 i->t.host_attrs.ac.class = &spi_host_class.class; 1583 i->t.host_attrs.ac.grp = &host_attribute_group; 1584 i->t.host_attrs.ac.match = spi_host_match; 1585 transport_container_register(&i->t.host_attrs); 1586 i->t.host_size = sizeof(struct spi_host_attrs); 1587 i->f = ft; 1588 1589 return &i->t; 1590 } 1591 EXPORT_SYMBOL(spi_attach_transport); 1592 1593 void spi_release_transport(struct scsi_transport_template *t) 1594 { 1595 struct spi_internal *i = to_spi_internal(t); 1596 1597 transport_container_unregister(&i->t.target_attrs); 1598 transport_container_unregister(&i->t.host_attrs); 1599 1600 kfree(i); 1601 } 1602 EXPORT_SYMBOL(spi_release_transport); 1603 1604 static __init int spi_transport_init(void) 1605 { 1606 int error = scsi_dev_info_add_list(SCSI_DEVINFO_SPI, 1607 "SCSI Parallel Transport Class"); 1608 if (!error) { 1609 int i; 1610 1611 for (i = 0; spi_static_device_list[i].vendor; i++) 1612 scsi_dev_info_list_add_keyed(1, /* compatible */ 1613 spi_static_device_list[i].vendor, 1614 spi_static_device_list[i].model, 1615 NULL, 1616 spi_static_device_list[i].flags, 1617 SCSI_DEVINFO_SPI); 1618 } 1619 1620 error = transport_class_register(&spi_transport_class); 1621 if (error) 1622 return error; 1623 error = anon_transport_class_register(&spi_device_class); 1624 return transport_class_register(&spi_host_class); 1625 } 1626 1627 static void __exit spi_transport_exit(void) 1628 { 1629 transport_class_unregister(&spi_transport_class); 1630 anon_transport_class_unregister(&spi_device_class); 1631 transport_class_unregister(&spi_host_class); 1632 scsi_dev_info_remove_list(SCSI_DEVINFO_SPI); 1633 } 1634 1635 MODULE_AUTHOR("Martin Hicks"); 1636 MODULE_DESCRIPTION("SPI Transport Attributes"); 1637 MODULE_LICENSE("GPL"); 1638 1639 module_init(spi_transport_init); 1640 module_exit(spi_transport_exit); 1641