1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * SATA specific part of ATA helper library 4 * 5 * Copyright 2003-2004 Red Hat, Inc. All rights reserved. 6 * Copyright 2003-2004 Jeff Garzik 7 * Copyright 2006 Tejun Heo <htejun@gmail.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <scsi/scsi_cmnd.h> 13 #include <scsi/scsi_device.h> 14 #include <linux/libata.h> 15 16 #include "libata.h" 17 #include "libata-transport.h" 18 19 /* debounce timing parameters in msecs { interval, duration, timeout } */ 20 const unsigned long sata_deb_timing_normal[] = { 5, 100, 2000 }; 21 EXPORT_SYMBOL_GPL(sata_deb_timing_normal); 22 const unsigned long sata_deb_timing_hotplug[] = { 25, 500, 2000 }; 23 EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug); 24 const unsigned long sata_deb_timing_long[] = { 100, 2000, 5000 }; 25 EXPORT_SYMBOL_GPL(sata_deb_timing_long); 26 27 /** 28 * sata_scr_valid - test whether SCRs are accessible 29 * @link: ATA link to test SCR accessibility for 30 * 31 * Test whether SCRs are accessible for @link. 32 * 33 * LOCKING: 34 * None. 35 * 36 * RETURNS: 37 * 1 if SCRs are accessible, 0 otherwise. 38 */ 39 int sata_scr_valid(struct ata_link *link) 40 { 41 struct ata_port *ap = link->ap; 42 43 return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read; 44 } 45 EXPORT_SYMBOL_GPL(sata_scr_valid); 46 47 /** 48 * sata_scr_read - read SCR register of the specified port 49 * @link: ATA link to read SCR for 50 * @reg: SCR to read 51 * @val: Place to store read value 52 * 53 * Read SCR register @reg of @link into *@val. This function is 54 * guaranteed to succeed if @link is ap->link, the cable type of 55 * the port is SATA and the port implements ->scr_read. 56 * 57 * LOCKING: 58 * None if @link is ap->link. Kernel thread context otherwise. 59 * 60 * RETURNS: 61 * 0 on success, negative errno on failure. 62 */ 63 int sata_scr_read(struct ata_link *link, int reg, u32 *val) 64 { 65 if (ata_is_host_link(link)) { 66 if (sata_scr_valid(link)) 67 return link->ap->ops->scr_read(link, reg, val); 68 return -EOPNOTSUPP; 69 } 70 71 return sata_pmp_scr_read(link, reg, val); 72 } 73 EXPORT_SYMBOL_GPL(sata_scr_read); 74 75 /** 76 * sata_scr_write - write SCR register of the specified port 77 * @link: ATA link to write SCR for 78 * @reg: SCR to write 79 * @val: value to write 80 * 81 * Write @val to SCR register @reg of @link. This function is 82 * guaranteed to succeed if @link is ap->link, the cable type of 83 * the port is SATA and the port implements ->scr_read. 84 * 85 * LOCKING: 86 * None if @link is ap->link. Kernel thread context otherwise. 87 * 88 * RETURNS: 89 * 0 on success, negative errno on failure. 90 */ 91 int sata_scr_write(struct ata_link *link, int reg, u32 val) 92 { 93 if (ata_is_host_link(link)) { 94 if (sata_scr_valid(link)) 95 return link->ap->ops->scr_write(link, reg, val); 96 return -EOPNOTSUPP; 97 } 98 99 return sata_pmp_scr_write(link, reg, val); 100 } 101 EXPORT_SYMBOL_GPL(sata_scr_write); 102 103 /** 104 * sata_scr_write_flush - write SCR register of the specified port and flush 105 * @link: ATA link to write SCR for 106 * @reg: SCR to write 107 * @val: value to write 108 * 109 * This function is identical to sata_scr_write() except that this 110 * function performs flush after writing to the register. 111 * 112 * LOCKING: 113 * None if @link is ap->link. Kernel thread context otherwise. 114 * 115 * RETURNS: 116 * 0 on success, negative errno on failure. 117 */ 118 int sata_scr_write_flush(struct ata_link *link, int reg, u32 val) 119 { 120 if (ata_is_host_link(link)) { 121 int rc; 122 123 if (sata_scr_valid(link)) { 124 rc = link->ap->ops->scr_write(link, reg, val); 125 if (rc == 0) 126 rc = link->ap->ops->scr_read(link, reg, &val); 127 return rc; 128 } 129 return -EOPNOTSUPP; 130 } 131 132 return sata_pmp_scr_write(link, reg, val); 133 } 134 EXPORT_SYMBOL_GPL(sata_scr_write_flush); 135 136 /** 137 * ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure 138 * @tf: Taskfile to convert 139 * @pmp: Port multiplier port 140 * @is_cmd: This FIS is for command 141 * @fis: Buffer into which data will output 142 * 143 * Converts a standard ATA taskfile to a Serial ATA 144 * FIS structure (Register - Host to Device). 145 * 146 * LOCKING: 147 * Inherited from caller. 148 */ 149 void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis) 150 { 151 fis[0] = 0x27; /* Register - Host to Device FIS */ 152 fis[1] = pmp & 0xf; /* Port multiplier number*/ 153 if (is_cmd) 154 fis[1] |= (1 << 7); /* bit 7 indicates Command FIS */ 155 156 fis[2] = tf->command; 157 fis[3] = tf->feature; 158 159 fis[4] = tf->lbal; 160 fis[5] = tf->lbam; 161 fis[6] = tf->lbah; 162 fis[7] = tf->device; 163 164 fis[8] = tf->hob_lbal; 165 fis[9] = tf->hob_lbam; 166 fis[10] = tf->hob_lbah; 167 fis[11] = tf->hob_feature; 168 169 fis[12] = tf->nsect; 170 fis[13] = tf->hob_nsect; 171 fis[14] = 0; 172 fis[15] = tf->ctl; 173 174 fis[16] = tf->auxiliary & 0xff; 175 fis[17] = (tf->auxiliary >> 8) & 0xff; 176 fis[18] = (tf->auxiliary >> 16) & 0xff; 177 fis[19] = (tf->auxiliary >> 24) & 0xff; 178 } 179 EXPORT_SYMBOL_GPL(ata_tf_to_fis); 180 181 /** 182 * ata_tf_from_fis - Convert SATA FIS to ATA taskfile 183 * @fis: Buffer from which data will be input 184 * @tf: Taskfile to output 185 * 186 * Converts a serial ATA FIS structure to a standard ATA taskfile. 187 * 188 * LOCKING: 189 * Inherited from caller. 190 */ 191 192 void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf) 193 { 194 tf->status = fis[2]; 195 tf->error = fis[3]; 196 197 tf->lbal = fis[4]; 198 tf->lbam = fis[5]; 199 tf->lbah = fis[6]; 200 tf->device = fis[7]; 201 202 tf->hob_lbal = fis[8]; 203 tf->hob_lbam = fis[9]; 204 tf->hob_lbah = fis[10]; 205 206 tf->nsect = fis[12]; 207 tf->hob_nsect = fis[13]; 208 } 209 EXPORT_SYMBOL_GPL(ata_tf_from_fis); 210 211 /** 212 * sata_link_debounce - debounce SATA phy status 213 * @link: ATA link to debounce SATA phy status for 214 * @params: timing parameters { interval, duration, timeout } in msec 215 * @deadline: deadline jiffies for the operation 216 * 217 * Make sure SStatus of @link reaches stable state, determined by 218 * holding the same value where DET is not 1 for @duration polled 219 * every @interval, before @timeout. Timeout constraints the 220 * beginning of the stable state. Because DET gets stuck at 1 on 221 * some controllers after hot unplugging, this functions waits 222 * until timeout then returns 0 if DET is stable at 1. 223 * 224 * @timeout is further limited by @deadline. The sooner of the 225 * two is used. 226 * 227 * LOCKING: 228 * Kernel thread context (may sleep) 229 * 230 * RETURNS: 231 * 0 on success, -errno on failure. 232 */ 233 int sata_link_debounce(struct ata_link *link, const unsigned long *params, 234 unsigned long deadline) 235 { 236 unsigned long interval = params[0]; 237 unsigned long duration = params[1]; 238 unsigned long last_jiffies, t; 239 u32 last, cur; 240 int rc; 241 242 t = ata_deadline(jiffies, params[2]); 243 if (time_before(t, deadline)) 244 deadline = t; 245 246 if ((rc = sata_scr_read(link, SCR_STATUS, &cur))) 247 return rc; 248 cur &= 0xf; 249 250 last = cur; 251 last_jiffies = jiffies; 252 253 while (1) { 254 ata_msleep(link->ap, interval); 255 if ((rc = sata_scr_read(link, SCR_STATUS, &cur))) 256 return rc; 257 cur &= 0xf; 258 259 /* DET stable? */ 260 if (cur == last) { 261 if (cur == 1 && time_before(jiffies, deadline)) 262 continue; 263 if (time_after(jiffies, 264 ata_deadline(last_jiffies, duration))) 265 return 0; 266 continue; 267 } 268 269 /* unstable, start over */ 270 last = cur; 271 last_jiffies = jiffies; 272 273 /* Check deadline. If debouncing failed, return 274 * -EPIPE to tell upper layer to lower link speed. 275 */ 276 if (time_after(jiffies, deadline)) 277 return -EPIPE; 278 } 279 } 280 EXPORT_SYMBOL_GPL(sata_link_debounce); 281 282 /** 283 * sata_link_resume - resume SATA link 284 * @link: ATA link to resume SATA 285 * @params: timing parameters { interval, duration, timeout } in msec 286 * @deadline: deadline jiffies for the operation 287 * 288 * Resume SATA phy @link and debounce it. 289 * 290 * LOCKING: 291 * Kernel thread context (may sleep) 292 * 293 * RETURNS: 294 * 0 on success, -errno on failure. 295 */ 296 int sata_link_resume(struct ata_link *link, const unsigned long *params, 297 unsigned long deadline) 298 { 299 int tries = ATA_LINK_RESUME_TRIES; 300 u32 scontrol, serror; 301 int rc; 302 303 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 304 return rc; 305 306 /* 307 * Writes to SControl sometimes get ignored under certain 308 * controllers (ata_piix SIDPR). Make sure DET actually is 309 * cleared. 310 */ 311 do { 312 scontrol = (scontrol & 0x0f0) | 0x300; 313 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 314 return rc; 315 /* 316 * Some PHYs react badly if SStatus is pounded 317 * immediately after resuming. Delay 200ms before 318 * debouncing. 319 */ 320 if (!(link->flags & ATA_LFLAG_NO_DEBOUNCE_DELAY)) 321 ata_msleep(link->ap, 200); 322 323 /* is SControl restored correctly? */ 324 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 325 return rc; 326 } while ((scontrol & 0xf0f) != 0x300 && --tries); 327 328 if ((scontrol & 0xf0f) != 0x300) { 329 ata_link_warn(link, "failed to resume link (SControl %X)\n", 330 scontrol); 331 return 0; 332 } 333 334 if (tries < ATA_LINK_RESUME_TRIES) 335 ata_link_warn(link, "link resume succeeded after %d retries\n", 336 ATA_LINK_RESUME_TRIES - tries); 337 338 if ((rc = sata_link_debounce(link, params, deadline))) 339 return rc; 340 341 /* clear SError, some PHYs require this even for SRST to work */ 342 if (!(rc = sata_scr_read(link, SCR_ERROR, &serror))) 343 rc = sata_scr_write(link, SCR_ERROR, serror); 344 345 return rc != -EINVAL ? rc : 0; 346 } 347 EXPORT_SYMBOL_GPL(sata_link_resume); 348 349 /** 350 * sata_link_scr_lpm - manipulate SControl IPM and SPM fields 351 * @link: ATA link to manipulate SControl for 352 * @policy: LPM policy to configure 353 * @spm_wakeup: initiate LPM transition to active state 354 * 355 * Manipulate the IPM field of the SControl register of @link 356 * according to @policy. If @policy is ATA_LPM_MAX_POWER and 357 * @spm_wakeup is %true, the SPM field is manipulated to wake up 358 * the link. This function also clears PHYRDY_CHG before 359 * returning. 360 * 361 * LOCKING: 362 * EH context. 363 * 364 * RETURNS: 365 * 0 on success, -errno otherwise. 366 */ 367 int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy, 368 bool spm_wakeup) 369 { 370 struct ata_eh_context *ehc = &link->eh_context; 371 bool woken_up = false; 372 u32 scontrol; 373 int rc; 374 375 rc = sata_scr_read(link, SCR_CONTROL, &scontrol); 376 if (rc) 377 return rc; 378 379 switch (policy) { 380 case ATA_LPM_MAX_POWER: 381 /* disable all LPM transitions */ 382 scontrol |= (0x7 << 8); 383 /* initiate transition to active state */ 384 if (spm_wakeup) { 385 scontrol |= (0x4 << 12); 386 woken_up = true; 387 } 388 break; 389 case ATA_LPM_MED_POWER: 390 /* allow LPM to PARTIAL */ 391 scontrol &= ~(0x1 << 8); 392 scontrol |= (0x6 << 8); 393 break; 394 case ATA_LPM_MED_POWER_WITH_DIPM: 395 case ATA_LPM_MIN_POWER_WITH_PARTIAL: 396 case ATA_LPM_MIN_POWER: 397 if (ata_link_nr_enabled(link) > 0) 398 /* no restrictions on LPM transitions */ 399 scontrol &= ~(0x7 << 8); 400 else { 401 /* empty port, power off */ 402 scontrol &= ~0xf; 403 scontrol |= (0x1 << 2); 404 } 405 break; 406 default: 407 WARN_ON(1); 408 } 409 410 rc = sata_scr_write(link, SCR_CONTROL, scontrol); 411 if (rc) 412 return rc; 413 414 /* give the link time to transit out of LPM state */ 415 if (woken_up) 416 msleep(10); 417 418 /* clear PHYRDY_CHG from SError */ 419 ehc->i.serror &= ~SERR_PHYRDY_CHG; 420 return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 421 } 422 EXPORT_SYMBOL_GPL(sata_link_scr_lpm); 423 424 static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol) 425 { 426 struct ata_link *host_link = &link->ap->link; 427 u32 limit, target, spd; 428 429 limit = link->sata_spd_limit; 430 431 /* Don't configure downstream link faster than upstream link. 432 * It doesn't speed up anything and some PMPs choke on such 433 * configuration. 434 */ 435 if (!ata_is_host_link(link) && host_link->sata_spd) 436 limit &= (1 << host_link->sata_spd) - 1; 437 438 if (limit == UINT_MAX) 439 target = 0; 440 else 441 target = fls(limit); 442 443 spd = (*scontrol >> 4) & 0xf; 444 *scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4); 445 446 return spd != target; 447 } 448 449 /** 450 * sata_set_spd_needed - is SATA spd configuration needed 451 * @link: Link in question 452 * 453 * Test whether the spd limit in SControl matches 454 * @link->sata_spd_limit. This function is used to determine 455 * whether hardreset is necessary to apply SATA spd 456 * configuration. 457 * 458 * LOCKING: 459 * Inherited from caller. 460 * 461 * RETURNS: 462 * 1 if SATA spd configuration is needed, 0 otherwise. 463 */ 464 static int sata_set_spd_needed(struct ata_link *link) 465 { 466 u32 scontrol; 467 468 if (sata_scr_read(link, SCR_CONTROL, &scontrol)) 469 return 1; 470 471 return __sata_set_spd_needed(link, &scontrol); 472 } 473 474 /** 475 * sata_set_spd - set SATA spd according to spd limit 476 * @link: Link to set SATA spd for 477 * 478 * Set SATA spd of @link according to sata_spd_limit. 479 * 480 * LOCKING: 481 * Inherited from caller. 482 * 483 * RETURNS: 484 * 0 if spd doesn't need to be changed, 1 if spd has been 485 * changed. Negative errno if SCR registers are inaccessible. 486 */ 487 int sata_set_spd(struct ata_link *link) 488 { 489 u32 scontrol; 490 int rc; 491 492 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 493 return rc; 494 495 if (!__sata_set_spd_needed(link, &scontrol)) 496 return 0; 497 498 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 499 return rc; 500 501 return 1; 502 } 503 EXPORT_SYMBOL_GPL(sata_set_spd); 504 505 /** 506 * sata_link_hardreset - reset link via SATA phy reset 507 * @link: link to reset 508 * @timing: timing parameters { interval, duration, timeout } in msec 509 * @deadline: deadline jiffies for the operation 510 * @online: optional out parameter indicating link onlineness 511 * @check_ready: optional callback to check link readiness 512 * 513 * SATA phy-reset @link using DET bits of SControl register. 514 * After hardreset, link readiness is waited upon using 515 * ata_wait_ready() if @check_ready is specified. LLDs are 516 * allowed to not specify @check_ready and wait itself after this 517 * function returns. Device classification is LLD's 518 * responsibility. 519 * 520 * *@online is set to one iff reset succeeded and @link is online 521 * after reset. 522 * 523 * LOCKING: 524 * Kernel thread context (may sleep) 525 * 526 * RETURNS: 527 * 0 on success, -errno otherwise. 528 */ 529 int sata_link_hardreset(struct ata_link *link, const unsigned long *timing, 530 unsigned long deadline, 531 bool *online, int (*check_ready)(struct ata_link *)) 532 { 533 u32 scontrol; 534 int rc; 535 536 if (online) 537 *online = false; 538 539 if (sata_set_spd_needed(link)) { 540 /* SATA spec says nothing about how to reconfigure 541 * spd. To be on the safe side, turn off phy during 542 * reconfiguration. This works for at least ICH7 AHCI 543 * and Sil3124. 544 */ 545 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 546 goto out; 547 548 scontrol = (scontrol & 0x0f0) | 0x304; 549 550 if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol))) 551 goto out; 552 553 sata_set_spd(link); 554 } 555 556 /* issue phy wake/reset */ 557 if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol))) 558 goto out; 559 560 scontrol = (scontrol & 0x0f0) | 0x301; 561 562 if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol))) 563 goto out; 564 565 /* Couldn't find anything in SATA I/II specs, but AHCI-1.1 566 * 10.4.2 says at least 1 ms. 567 */ 568 ata_msleep(link->ap, 1); 569 570 /* bring link back */ 571 rc = sata_link_resume(link, timing, deadline); 572 if (rc) 573 goto out; 574 /* if link is offline nothing more to do */ 575 if (ata_phys_link_offline(link)) 576 goto out; 577 578 /* Link is online. From this point, -ENODEV too is an error. */ 579 if (online) 580 *online = true; 581 582 if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) { 583 /* If PMP is supported, we have to do follow-up SRST. 584 * Some PMPs don't send D2H Reg FIS after hardreset if 585 * the first port is empty. Wait only for 586 * ATA_TMOUT_PMP_SRST_WAIT. 587 */ 588 if (check_ready) { 589 unsigned long pmp_deadline; 590 591 pmp_deadline = ata_deadline(jiffies, 592 ATA_TMOUT_PMP_SRST_WAIT); 593 if (time_after(pmp_deadline, deadline)) 594 pmp_deadline = deadline; 595 ata_wait_ready(link, pmp_deadline, check_ready); 596 } 597 rc = -EAGAIN; 598 goto out; 599 } 600 601 rc = 0; 602 if (check_ready) 603 rc = ata_wait_ready(link, deadline, check_ready); 604 out: 605 if (rc && rc != -EAGAIN) { 606 /* online is set iff link is online && reset succeeded */ 607 if (online) 608 *online = false; 609 ata_link_err(link, "COMRESET failed (errno=%d)\n", rc); 610 } 611 return rc; 612 } 613 EXPORT_SYMBOL_GPL(sata_link_hardreset); 614 615 /** 616 * ata_qc_complete_multiple - Complete multiple qcs successfully 617 * @ap: port in question 618 * @qc_active: new qc_active mask 619 * 620 * Complete in-flight commands. This functions is meant to be 621 * called from low-level driver's interrupt routine to complete 622 * requests normally. ap->qc_active and @qc_active is compared 623 * and commands are completed accordingly. 624 * 625 * Always use this function when completing multiple NCQ commands 626 * from IRQ handlers instead of calling ata_qc_complete() 627 * multiple times to keep IRQ expect status properly in sync. 628 * 629 * LOCKING: 630 * spin_lock_irqsave(host lock) 631 * 632 * RETURNS: 633 * Number of completed commands on success, -errno otherwise. 634 */ 635 int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active) 636 { 637 u64 done_mask, ap_qc_active = ap->qc_active; 638 int nr_done = 0; 639 640 /* 641 * If the internal tag is set on ap->qc_active, then we care about 642 * bit0 on the passed in qc_active mask. Move that bit up to match 643 * the internal tag. 644 */ 645 if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) { 646 qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL; 647 qc_active ^= qc_active & 0x01; 648 } 649 650 done_mask = ap_qc_active ^ qc_active; 651 652 if (unlikely(done_mask & qc_active)) { 653 ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n", 654 ap->qc_active, qc_active); 655 return -EINVAL; 656 } 657 658 while (done_mask) { 659 struct ata_queued_cmd *qc; 660 unsigned int tag = __ffs64(done_mask); 661 662 qc = ata_qc_from_tag(ap, tag); 663 if (qc) { 664 ata_qc_complete(qc); 665 nr_done++; 666 } 667 done_mask &= ~(1ULL << tag); 668 } 669 670 return nr_done; 671 } 672 EXPORT_SYMBOL_GPL(ata_qc_complete_multiple); 673 674 /** 675 * ata_slave_link_init - initialize slave link 676 * @ap: port to initialize slave link for 677 * 678 * Create and initialize slave link for @ap. This enables slave 679 * link handling on the port. 680 * 681 * In libata, a port contains links and a link contains devices. 682 * There is single host link but if a PMP is attached to it, 683 * there can be multiple fan-out links. On SATA, there's usually 684 * a single device connected to a link but PATA and SATA 685 * controllers emulating TF based interface can have two - master 686 * and slave. 687 * 688 * However, there are a few controllers which don't fit into this 689 * abstraction too well - SATA controllers which emulate TF 690 * interface with both master and slave devices but also have 691 * separate SCR register sets for each device. These controllers 692 * need separate links for physical link handling 693 * (e.g. onlineness, link speed) but should be treated like a 694 * traditional M/S controller for everything else (e.g. command 695 * issue, softreset). 696 * 697 * slave_link is libata's way of handling this class of 698 * controllers without impacting core layer too much. For 699 * anything other than physical link handling, the default host 700 * link is used for both master and slave. For physical link 701 * handling, separate @ap->slave_link is used. All dirty details 702 * are implemented inside libata core layer. From LLD's POV, the 703 * only difference is that prereset, hardreset and postreset are 704 * called once more for the slave link, so the reset sequence 705 * looks like the following. 706 * 707 * prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) -> 708 * softreset(M) -> postreset(M) -> postreset(S) 709 * 710 * Note that softreset is called only for the master. Softreset 711 * resets both M/S by definition, so SRST on master should handle 712 * both (the standard method will work just fine). 713 * 714 * LOCKING: 715 * Should be called before host is registered. 716 * 717 * RETURNS: 718 * 0 on success, -errno on failure. 719 */ 720 int ata_slave_link_init(struct ata_port *ap) 721 { 722 struct ata_link *link; 723 724 WARN_ON(ap->slave_link); 725 WARN_ON(ap->flags & ATA_FLAG_PMP); 726 727 link = kzalloc(sizeof(*link), GFP_KERNEL); 728 if (!link) 729 return -ENOMEM; 730 731 ata_link_init(ap, link, 1); 732 ap->slave_link = link; 733 return 0; 734 } 735 EXPORT_SYMBOL_GPL(ata_slave_link_init); 736 737 /** 738 * sata_lpm_ignore_phy_events - test if PHY event should be ignored 739 * @link: Link receiving the event 740 * 741 * Test whether the received PHY event has to be ignored or not. 742 * 743 * LOCKING: 744 * None: 745 * 746 * RETURNS: 747 * True if the event has to be ignored. 748 */ 749 bool sata_lpm_ignore_phy_events(struct ata_link *link) 750 { 751 unsigned long lpm_timeout = link->last_lpm_change + 752 msecs_to_jiffies(ATA_TMOUT_SPURIOUS_PHY); 753 754 /* if LPM is enabled, PHYRDY doesn't mean anything */ 755 if (link->lpm_policy > ATA_LPM_MAX_POWER) 756 return true; 757 758 /* ignore the first PHY event after the LPM policy changed 759 * as it is might be spurious 760 */ 761 if ((link->flags & ATA_LFLAG_CHANGED) && 762 time_before(jiffies, lpm_timeout)) 763 return true; 764 765 return false; 766 } 767 EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events); 768 769 static const char *ata_lpm_policy_names[] = { 770 [ATA_LPM_UNKNOWN] = "max_performance", 771 [ATA_LPM_MAX_POWER] = "max_performance", 772 [ATA_LPM_MED_POWER] = "medium_power", 773 [ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm", 774 [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial", 775 [ATA_LPM_MIN_POWER] = "min_power", 776 }; 777 778 static ssize_t ata_scsi_lpm_store(struct device *device, 779 struct device_attribute *attr, 780 const char *buf, size_t count) 781 { 782 struct Scsi_Host *shost = class_to_shost(device); 783 struct ata_port *ap = ata_shost_to_port(shost); 784 struct ata_link *link; 785 struct ata_device *dev; 786 enum ata_lpm_policy policy; 787 unsigned long flags; 788 789 /* UNKNOWN is internal state, iterate from MAX_POWER */ 790 for (policy = ATA_LPM_MAX_POWER; 791 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) { 792 const char *name = ata_lpm_policy_names[policy]; 793 794 if (strncmp(name, buf, strlen(name)) == 0) 795 break; 796 } 797 if (policy == ARRAY_SIZE(ata_lpm_policy_names)) 798 return -EINVAL; 799 800 spin_lock_irqsave(ap->lock, flags); 801 802 ata_for_each_link(link, ap, EDGE) { 803 ata_for_each_dev(dev, &ap->link, ENABLED) { 804 if (dev->horkage & ATA_HORKAGE_NOLPM) { 805 count = -EOPNOTSUPP; 806 goto out_unlock; 807 } 808 } 809 } 810 811 ap->target_lpm_policy = policy; 812 ata_port_schedule_eh(ap); 813 out_unlock: 814 spin_unlock_irqrestore(ap->lock, flags); 815 return count; 816 } 817 818 static ssize_t ata_scsi_lpm_show(struct device *dev, 819 struct device_attribute *attr, char *buf) 820 { 821 struct Scsi_Host *shost = class_to_shost(dev); 822 struct ata_port *ap = ata_shost_to_port(shost); 823 824 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names)) 825 return -EINVAL; 826 827 return sysfs_emit(buf, "%s\n", 828 ata_lpm_policy_names[ap->target_lpm_policy]); 829 } 830 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR, 831 ata_scsi_lpm_show, ata_scsi_lpm_store); 832 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy); 833 834 static ssize_t ata_ncq_prio_supported_show(struct device *device, 835 struct device_attribute *attr, 836 char *buf) 837 { 838 struct scsi_device *sdev = to_scsi_device(device); 839 struct ata_port *ap = ata_shost_to_port(sdev->host); 840 struct ata_device *dev; 841 bool ncq_prio_supported; 842 int rc = 0; 843 844 spin_lock_irq(ap->lock); 845 dev = ata_scsi_find_dev(ap, sdev); 846 if (!dev) 847 rc = -ENODEV; 848 else 849 ncq_prio_supported = dev->flags & ATA_DFLAG_NCQ_PRIO; 850 spin_unlock_irq(ap->lock); 851 852 return rc ? rc : sysfs_emit(buf, "%u\n", ncq_prio_supported); 853 } 854 855 DEVICE_ATTR(ncq_prio_supported, S_IRUGO, ata_ncq_prio_supported_show, NULL); 856 EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_supported); 857 858 static ssize_t ata_ncq_prio_enable_show(struct device *device, 859 struct device_attribute *attr, 860 char *buf) 861 { 862 struct scsi_device *sdev = to_scsi_device(device); 863 struct ata_port *ap = ata_shost_to_port(sdev->host); 864 struct ata_device *dev; 865 bool ncq_prio_enable; 866 int rc = 0; 867 868 spin_lock_irq(ap->lock); 869 dev = ata_scsi_find_dev(ap, sdev); 870 if (!dev) 871 rc = -ENODEV; 872 else 873 ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED; 874 spin_unlock_irq(ap->lock); 875 876 return rc ? rc : sysfs_emit(buf, "%u\n", ncq_prio_enable); 877 } 878 879 static ssize_t ata_ncq_prio_enable_store(struct device *device, 880 struct device_attribute *attr, 881 const char *buf, size_t len) 882 { 883 struct scsi_device *sdev = to_scsi_device(device); 884 struct ata_port *ap; 885 struct ata_device *dev; 886 long int input; 887 int rc = 0; 888 889 rc = kstrtol(buf, 10, &input); 890 if (rc) 891 return rc; 892 if ((input < 0) || (input > 1)) 893 return -EINVAL; 894 895 ap = ata_shost_to_port(sdev->host); 896 dev = ata_scsi_find_dev(ap, sdev); 897 if (unlikely(!dev)) 898 return -ENODEV; 899 900 spin_lock_irq(ap->lock); 901 902 if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) { 903 rc = -EINVAL; 904 goto unlock; 905 } 906 907 if (input) 908 dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLED; 909 else 910 dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLED; 911 912 unlock: 913 spin_unlock_irq(ap->lock); 914 915 return rc ? rc : len; 916 } 917 918 DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR, 919 ata_ncq_prio_enable_show, ata_ncq_prio_enable_store); 920 EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable); 921 922 static struct attribute *ata_ncq_sdev_attrs[] = { 923 &dev_attr_unload_heads.attr, 924 &dev_attr_ncq_prio_enable.attr, 925 &dev_attr_ncq_prio_supported.attr, 926 NULL 927 }; 928 929 static const struct attribute_group ata_ncq_sdev_attr_group = { 930 .attrs = ata_ncq_sdev_attrs 931 }; 932 933 const struct attribute_group *ata_ncq_sdev_groups[] = { 934 &ata_ncq_sdev_attr_group, 935 NULL 936 }; 937 EXPORT_SYMBOL_GPL(ata_ncq_sdev_groups); 938 939 static ssize_t 940 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr, 941 const char *buf, size_t count) 942 { 943 struct Scsi_Host *shost = class_to_shost(dev); 944 struct ata_port *ap = ata_shost_to_port(shost); 945 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM)) 946 return ap->ops->em_store(ap, buf, count); 947 return -EINVAL; 948 } 949 950 static ssize_t 951 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr, 952 char *buf) 953 { 954 struct Scsi_Host *shost = class_to_shost(dev); 955 struct ata_port *ap = ata_shost_to_port(shost); 956 957 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM)) 958 return ap->ops->em_show(ap, buf); 959 return -EINVAL; 960 } 961 DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR, 962 ata_scsi_em_message_show, ata_scsi_em_message_store); 963 EXPORT_SYMBOL_GPL(dev_attr_em_message); 964 965 static ssize_t 966 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr, 967 char *buf) 968 { 969 struct Scsi_Host *shost = class_to_shost(dev); 970 struct ata_port *ap = ata_shost_to_port(shost); 971 972 return sysfs_emit(buf, "%d\n", ap->em_message_type); 973 } 974 DEVICE_ATTR(em_message_type, S_IRUGO, 975 ata_scsi_em_message_type_show, NULL); 976 EXPORT_SYMBOL_GPL(dev_attr_em_message_type); 977 978 static ssize_t 979 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr, 980 char *buf) 981 { 982 struct scsi_device *sdev = to_scsi_device(dev); 983 struct ata_port *ap = ata_shost_to_port(sdev->host); 984 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 985 986 if (atadev && ap->ops->sw_activity_show && 987 (ap->flags & ATA_FLAG_SW_ACTIVITY)) 988 return ap->ops->sw_activity_show(atadev, buf); 989 return -EINVAL; 990 } 991 992 static ssize_t 993 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr, 994 const char *buf, size_t count) 995 { 996 struct scsi_device *sdev = to_scsi_device(dev); 997 struct ata_port *ap = ata_shost_to_port(sdev->host); 998 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev); 999 enum sw_activity val; 1000 int rc; 1001 1002 if (atadev && ap->ops->sw_activity_store && 1003 (ap->flags & ATA_FLAG_SW_ACTIVITY)) { 1004 val = simple_strtoul(buf, NULL, 0); 1005 switch (val) { 1006 case OFF: case BLINK_ON: case BLINK_OFF: 1007 rc = ap->ops->sw_activity_store(atadev, val); 1008 if (!rc) 1009 return count; 1010 else 1011 return rc; 1012 } 1013 } 1014 return -EINVAL; 1015 } 1016 DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show, 1017 ata_scsi_activity_store); 1018 EXPORT_SYMBOL_GPL(dev_attr_sw_activity); 1019 1020 /** 1021 * ata_change_queue_depth - Set a device maximum queue depth 1022 * @ap: ATA port of the target device 1023 * @dev: target ATA device 1024 * @sdev: SCSI device to configure queue depth for 1025 * @queue_depth: new queue depth 1026 * 1027 * Helper to set a device maximum queue depth, usable with both libsas 1028 * and libata. 1029 * 1030 */ 1031 int ata_change_queue_depth(struct ata_port *ap, struct ata_device *dev, 1032 struct scsi_device *sdev, int queue_depth) 1033 { 1034 unsigned long flags; 1035 1036 if (!dev || !ata_dev_enabled(dev)) 1037 return sdev->queue_depth; 1038 1039 if (queue_depth < 1 || queue_depth == sdev->queue_depth) 1040 return sdev->queue_depth; 1041 1042 /* NCQ enabled? */ 1043 spin_lock_irqsave(ap->lock, flags); 1044 dev->flags &= ~ATA_DFLAG_NCQ_OFF; 1045 if (queue_depth == 1 || !ata_ncq_enabled(dev)) { 1046 dev->flags |= ATA_DFLAG_NCQ_OFF; 1047 queue_depth = 1; 1048 } 1049 spin_unlock_irqrestore(ap->lock, flags); 1050 1051 /* limit and apply queue depth */ 1052 queue_depth = min(queue_depth, sdev->host->can_queue); 1053 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id)); 1054 queue_depth = min(queue_depth, ATA_MAX_QUEUE); 1055 1056 if (sdev->queue_depth == queue_depth) 1057 return -EINVAL; 1058 1059 return scsi_change_queue_depth(sdev, queue_depth); 1060 } 1061 EXPORT_SYMBOL_GPL(ata_change_queue_depth); 1062 1063 /** 1064 * ata_scsi_change_queue_depth - SCSI callback for queue depth config 1065 * @sdev: SCSI device to configure queue depth for 1066 * @queue_depth: new queue depth 1067 * 1068 * This is libata standard hostt->change_queue_depth callback. 1069 * SCSI will call into this callback when user tries to set queue 1070 * depth via sysfs. 1071 * 1072 * LOCKING: 1073 * SCSI layer (we don't care) 1074 * 1075 * RETURNS: 1076 * Newly configured queue depth. 1077 */ 1078 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth) 1079 { 1080 struct ata_port *ap = ata_shost_to_port(sdev->host); 1081 1082 return ata_change_queue_depth(ap, ata_scsi_find_dev(ap, sdev), 1083 sdev, queue_depth); 1084 } 1085 EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth); 1086 1087 /** 1088 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device 1089 * @host: ATA host container for all SAS ports 1090 * @port_info: Information from low-level host driver 1091 * @shost: SCSI host that the scsi device is attached to 1092 * 1093 * LOCKING: 1094 * PCI/etc. bus probe sem. 1095 * 1096 * RETURNS: 1097 * ata_port pointer on success / NULL on failure. 1098 */ 1099 1100 struct ata_port *ata_sas_port_alloc(struct ata_host *host, 1101 struct ata_port_info *port_info, 1102 struct Scsi_Host *shost) 1103 { 1104 struct ata_port *ap; 1105 1106 ap = ata_port_alloc(host); 1107 if (!ap) 1108 return NULL; 1109 1110 ap->port_no = 0; 1111 ap->lock = &host->lock; 1112 ap->pio_mask = port_info->pio_mask; 1113 ap->mwdma_mask = port_info->mwdma_mask; 1114 ap->udma_mask = port_info->udma_mask; 1115 ap->flags |= port_info->flags; 1116 ap->ops = port_info->port_ops; 1117 ap->cbl = ATA_CBL_SATA; 1118 1119 return ap; 1120 } 1121 EXPORT_SYMBOL_GPL(ata_sas_port_alloc); 1122 1123 /** 1124 * ata_sas_port_start - Set port up for dma. 1125 * @ap: Port to initialize 1126 * 1127 * Called just after data structures for each port are 1128 * initialized. 1129 * 1130 * May be used as the port_start() entry in ata_port_operations. 1131 * 1132 * LOCKING: 1133 * Inherited from caller. 1134 */ 1135 int ata_sas_port_start(struct ata_port *ap) 1136 { 1137 /* 1138 * the port is marked as frozen at allocation time, but if we don't 1139 * have new eh, we won't thaw it 1140 */ 1141 if (!ap->ops->error_handler) 1142 ap->pflags &= ~ATA_PFLAG_FROZEN; 1143 return 0; 1144 } 1145 EXPORT_SYMBOL_GPL(ata_sas_port_start); 1146 1147 /** 1148 * ata_sas_port_stop - Undo ata_sas_port_start() 1149 * @ap: Port to shut down 1150 * 1151 * May be used as the port_stop() entry in ata_port_operations. 1152 * 1153 * LOCKING: 1154 * Inherited from caller. 1155 */ 1156 1157 void ata_sas_port_stop(struct ata_port *ap) 1158 { 1159 } 1160 EXPORT_SYMBOL_GPL(ata_sas_port_stop); 1161 1162 /** 1163 * ata_sas_async_probe - simply schedule probing and return 1164 * @ap: Port to probe 1165 * 1166 * For batch scheduling of probe for sas attached ata devices, assumes 1167 * the port has already been through ata_sas_port_init() 1168 */ 1169 void ata_sas_async_probe(struct ata_port *ap) 1170 { 1171 __ata_port_probe(ap); 1172 } 1173 EXPORT_SYMBOL_GPL(ata_sas_async_probe); 1174 1175 int ata_sas_sync_probe(struct ata_port *ap) 1176 { 1177 return ata_port_probe(ap); 1178 } 1179 EXPORT_SYMBOL_GPL(ata_sas_sync_probe); 1180 1181 1182 /** 1183 * ata_sas_port_init - Initialize a SATA device 1184 * @ap: SATA port to initialize 1185 * 1186 * LOCKING: 1187 * PCI/etc. bus probe sem. 1188 * 1189 * RETURNS: 1190 * Zero on success, non-zero on error. 1191 */ 1192 1193 int ata_sas_port_init(struct ata_port *ap) 1194 { 1195 int rc = ap->ops->port_start(ap); 1196 1197 if (rc) 1198 return rc; 1199 ap->print_id = atomic_inc_return(&ata_print_id); 1200 return 0; 1201 } 1202 EXPORT_SYMBOL_GPL(ata_sas_port_init); 1203 1204 int ata_sas_tport_add(struct device *parent, struct ata_port *ap) 1205 { 1206 return ata_tport_add(parent, ap); 1207 } 1208 EXPORT_SYMBOL_GPL(ata_sas_tport_add); 1209 1210 void ata_sas_tport_delete(struct ata_port *ap) 1211 { 1212 ata_tport_delete(ap); 1213 } 1214 EXPORT_SYMBOL_GPL(ata_sas_tport_delete); 1215 1216 /** 1217 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc 1218 * @ap: SATA port to destroy 1219 * 1220 */ 1221 1222 void ata_sas_port_destroy(struct ata_port *ap) 1223 { 1224 if (ap->ops->port_stop) 1225 ap->ops->port_stop(ap); 1226 kfree(ap); 1227 } 1228 EXPORT_SYMBOL_GPL(ata_sas_port_destroy); 1229 1230 /** 1231 * ata_sas_slave_configure - Default slave_config routine for libata devices 1232 * @sdev: SCSI device to configure 1233 * @ap: ATA port to which SCSI device is attached 1234 * 1235 * RETURNS: 1236 * Zero. 1237 */ 1238 1239 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap) 1240 { 1241 ata_scsi_sdev_config(sdev); 1242 ata_scsi_dev_config(sdev, ap->link.device); 1243 return 0; 1244 } 1245 EXPORT_SYMBOL_GPL(ata_sas_slave_configure); 1246 1247 /** 1248 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device 1249 * @cmd: SCSI command to be sent 1250 * @ap: ATA port to which the command is being sent 1251 * 1252 * RETURNS: 1253 * Return value from __ata_scsi_queuecmd() if @cmd can be queued, 1254 * 0 otherwise. 1255 */ 1256 1257 int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap) 1258 { 1259 int rc = 0; 1260 1261 if (likely(ata_dev_enabled(ap->link.device))) 1262 rc = __ata_scsi_queuecmd(cmd, ap->link.device); 1263 else { 1264 cmd->result = (DID_BAD_TARGET << 16); 1265 scsi_done(cmd); 1266 } 1267 return rc; 1268 } 1269 EXPORT_SYMBOL_GPL(ata_sas_queuecmd); 1270 1271 /** 1272 * sata_async_notification - SATA async notification handler 1273 * @ap: ATA port where async notification is received 1274 * 1275 * Handler to be called when async notification via SDB FIS is 1276 * received. This function schedules EH if necessary. 1277 * 1278 * LOCKING: 1279 * spin_lock_irqsave(host lock) 1280 * 1281 * RETURNS: 1282 * 1 if EH is scheduled, 0 otherwise. 1283 */ 1284 int sata_async_notification(struct ata_port *ap) 1285 { 1286 u32 sntf; 1287 int rc; 1288 1289 if (!(ap->flags & ATA_FLAG_AN)) 1290 return 0; 1291 1292 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 1293 if (rc == 0) 1294 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 1295 1296 if (!sata_pmp_attached(ap) || rc) { 1297 /* PMP is not attached or SNTF is not available */ 1298 if (!sata_pmp_attached(ap)) { 1299 /* PMP is not attached. Check whether ATAPI 1300 * AN is configured. If so, notify media 1301 * change. 1302 */ 1303 struct ata_device *dev = ap->link.device; 1304 1305 if ((dev->class == ATA_DEV_ATAPI) && 1306 (dev->flags & ATA_DFLAG_AN)) 1307 ata_scsi_media_change_notify(dev); 1308 return 0; 1309 } else { 1310 /* PMP is attached but SNTF is not available. 1311 * ATAPI async media change notification is 1312 * not used. The PMP must be reporting PHY 1313 * status change, schedule EH. 1314 */ 1315 ata_port_schedule_eh(ap); 1316 return 1; 1317 } 1318 } else { 1319 /* PMP is attached and SNTF is available */ 1320 struct ata_link *link; 1321 1322 /* check and notify ATAPI AN */ 1323 ata_for_each_link(link, ap, EDGE) { 1324 if (!(sntf & (1 << link->pmp))) 1325 continue; 1326 1327 if ((link->device->class == ATA_DEV_ATAPI) && 1328 (link->device->flags & ATA_DFLAG_AN)) 1329 ata_scsi_media_change_notify(link->device); 1330 } 1331 1332 /* If PMP is reporting that PHY status of some 1333 * downstream ports has changed, schedule EH. 1334 */ 1335 if (sntf & (1 << SATA_PMP_CTRL_PORT)) { 1336 ata_port_schedule_eh(ap); 1337 return 1; 1338 } 1339 1340 return 0; 1341 } 1342 } 1343 EXPORT_SYMBOL_GPL(sata_async_notification); 1344 1345 /** 1346 * ata_eh_read_log_10h - Read log page 10h for NCQ error details 1347 * @dev: Device to read log page 10h from 1348 * @tag: Resulting tag of the failed command 1349 * @tf: Resulting taskfile registers of the failed command 1350 * 1351 * Read log page 10h to obtain NCQ error details and clear error 1352 * condition. 1353 * 1354 * LOCKING: 1355 * Kernel thread context (may sleep). 1356 * 1357 * RETURNS: 1358 * 0 on success, -errno otherwise. 1359 */ 1360 static int ata_eh_read_log_10h(struct ata_device *dev, 1361 int *tag, struct ata_taskfile *tf) 1362 { 1363 u8 *buf = dev->link->ap->sector_buf; 1364 unsigned int err_mask; 1365 u8 csum; 1366 int i; 1367 1368 err_mask = ata_read_log_page(dev, ATA_LOG_SATA_NCQ, 0, buf, 1); 1369 if (err_mask) 1370 return -EIO; 1371 1372 csum = 0; 1373 for (i = 0; i < ATA_SECT_SIZE; i++) 1374 csum += buf[i]; 1375 if (csum) 1376 ata_dev_warn(dev, "invalid checksum 0x%x on log page 10h\n", 1377 csum); 1378 1379 if (buf[0] & 0x80) 1380 return -ENOENT; 1381 1382 *tag = buf[0] & 0x1f; 1383 1384 tf->status = buf[2]; 1385 tf->error = buf[3]; 1386 tf->lbal = buf[4]; 1387 tf->lbam = buf[5]; 1388 tf->lbah = buf[6]; 1389 tf->device = buf[7]; 1390 tf->hob_lbal = buf[8]; 1391 tf->hob_lbam = buf[9]; 1392 tf->hob_lbah = buf[10]; 1393 tf->nsect = buf[12]; 1394 tf->hob_nsect = buf[13]; 1395 if (ata_id_has_ncq_autosense(dev->id) && (tf->status & ATA_SENSE)) 1396 tf->auxiliary = buf[14] << 16 | buf[15] << 8 | buf[16]; 1397 1398 return 0; 1399 } 1400 1401 /** 1402 * ata_eh_analyze_ncq_error - analyze NCQ error 1403 * @link: ATA link to analyze NCQ error for 1404 * 1405 * Read log page 10h, determine the offending qc and acquire 1406 * error status TF. For NCQ device errors, all LLDDs have to do 1407 * is setting AC_ERR_DEV in ehi->err_mask. This function takes 1408 * care of the rest. 1409 * 1410 * LOCKING: 1411 * Kernel thread context (may sleep). 1412 */ 1413 void ata_eh_analyze_ncq_error(struct ata_link *link) 1414 { 1415 struct ata_port *ap = link->ap; 1416 struct ata_eh_context *ehc = &link->eh_context; 1417 struct ata_device *dev = link->device; 1418 struct ata_queued_cmd *qc; 1419 struct ata_taskfile tf; 1420 int tag, rc; 1421 1422 /* if frozen, we can't do much */ 1423 if (ata_port_is_frozen(ap)) 1424 return; 1425 1426 /* is it NCQ device error? */ 1427 if (!link->sactive || !(ehc->i.err_mask & AC_ERR_DEV)) 1428 return; 1429 1430 /* has LLDD analyzed already? */ 1431 ata_qc_for_each_raw(ap, qc, tag) { 1432 if (!(qc->flags & ATA_QCFLAG_FAILED)) 1433 continue; 1434 1435 if (qc->err_mask) 1436 return; 1437 } 1438 1439 /* okay, this error is ours */ 1440 memset(&tf, 0, sizeof(tf)); 1441 rc = ata_eh_read_log_10h(dev, &tag, &tf); 1442 if (rc) { 1443 ata_link_err(link, "failed to read log page 10h (errno=%d)\n", 1444 rc); 1445 return; 1446 } 1447 1448 if (!(link->sactive & (1 << tag))) { 1449 ata_link_err(link, "log page 10h reported inactive tag %d\n", 1450 tag); 1451 return; 1452 } 1453 1454 /* we've got the perpetrator, condemn it */ 1455 qc = __ata_qc_from_tag(ap, tag); 1456 memcpy(&qc->result_tf, &tf, sizeof(tf)); 1457 qc->result_tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_LBA | ATA_TFLAG_LBA48; 1458 qc->err_mask |= AC_ERR_DEV | AC_ERR_NCQ; 1459 1460 /* 1461 * If the device supports NCQ autosense, ata_eh_read_log_10h() will have 1462 * stored the sense data in qc->result_tf.auxiliary. 1463 */ 1464 if (qc->result_tf.auxiliary) { 1465 char sense_key, asc, ascq; 1466 1467 sense_key = (qc->result_tf.auxiliary >> 16) & 0xff; 1468 asc = (qc->result_tf.auxiliary >> 8) & 0xff; 1469 ascq = qc->result_tf.auxiliary & 0xff; 1470 if (ata_scsi_sense_is_valid(sense_key, asc, ascq)) { 1471 ata_scsi_set_sense(dev, qc->scsicmd, sense_key, asc, 1472 ascq); 1473 ata_scsi_set_sense_information(dev, qc->scsicmd, 1474 &qc->result_tf); 1475 qc->flags |= ATA_QCFLAG_SENSE_VALID; 1476 } 1477 } 1478 1479 ata_qc_for_each_raw(ap, qc, tag) { 1480 if (!(qc->flags & ATA_QCFLAG_FAILED) || 1481 ata_dev_phys_link(qc->dev) != link) 1482 continue; 1483 1484 /* Skip the single QC which caused the NCQ error. */ 1485 if (qc->err_mask) 1486 continue; 1487 1488 /* 1489 * For SATA, the STATUS and ERROR fields are shared for all NCQ 1490 * commands that were completed with the same SDB FIS. 1491 * Therefore, we have to clear the ATA_ERR bit for all QCs 1492 * except the one that caused the NCQ error. 1493 */ 1494 qc->result_tf.status &= ~ATA_ERR; 1495 qc->result_tf.error = 0; 1496 1497 /* 1498 * If we get a NCQ error, that means that a single command was 1499 * aborted. All other failed commands for our link should be 1500 * retried and has no business of going though further scrutiny 1501 * by ata_eh_link_autopsy(). 1502 */ 1503 qc->flags |= ATA_QCFLAG_RETRY; 1504 } 1505 1506 ehc->i.err_mask &= ~AC_ERR_DEV; 1507 } 1508 EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error); 1509