1 /* 2 * libata-pmp.c - libata port multiplier support 3 * 4 * Copyright (c) 2007 SUSE Linux Products GmbH 5 * Copyright (c) 2007 Tejun Heo <teheo@suse.de> 6 * 7 * This file is released under the GPLv2. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/export.h> 12 #include <linux/libata.h> 13 #include <linux/slab.h> 14 #include "libata.h" 15 #include "libata-transport.h" 16 17 const struct ata_port_operations sata_pmp_port_ops = { 18 .inherits = &sata_port_ops, 19 .pmp_prereset = ata_std_prereset, 20 .pmp_hardreset = sata_std_hardreset, 21 .pmp_postreset = ata_std_postreset, 22 .error_handler = sata_pmp_error_handler, 23 }; 24 25 /** 26 * sata_pmp_read - read PMP register 27 * @link: link to read PMP register for 28 * @reg: register to read 29 * @r_val: resulting value 30 * 31 * Read PMP register. 32 * 33 * LOCKING: 34 * Kernel thread context (may sleep). 35 * 36 * RETURNS: 37 * 0 on success, AC_ERR_* mask on failure. 38 */ 39 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 40 { 41 struct ata_port *ap = link->ap; 42 struct ata_device *pmp_dev = ap->link.device; 43 struct ata_taskfile tf; 44 unsigned int err_mask; 45 46 ata_tf_init(pmp_dev, &tf); 47 tf.command = ATA_CMD_PMP_READ; 48 tf.protocol = ATA_PROT_NODATA; 49 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 50 tf.feature = reg; 51 tf.device = link->pmp; 52 53 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 54 SATA_PMP_RW_TIMEOUT); 55 if (err_mask) 56 return err_mask; 57 58 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 59 return 0; 60 } 61 62 /** 63 * sata_pmp_write - write PMP register 64 * @link: link to write PMP register for 65 * @reg: register to write 66 * @r_val: value to write 67 * 68 * Write PMP register. 69 * 70 * LOCKING: 71 * Kernel thread context (may sleep). 72 * 73 * RETURNS: 74 * 0 on success, AC_ERR_* mask on failure. 75 */ 76 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 77 { 78 struct ata_port *ap = link->ap; 79 struct ata_device *pmp_dev = ap->link.device; 80 struct ata_taskfile tf; 81 82 ata_tf_init(pmp_dev, &tf); 83 tf.command = ATA_CMD_PMP_WRITE; 84 tf.protocol = ATA_PROT_NODATA; 85 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 86 tf.feature = reg; 87 tf.device = link->pmp; 88 tf.nsect = val & 0xff; 89 tf.lbal = (val >> 8) & 0xff; 90 tf.lbam = (val >> 16) & 0xff; 91 tf.lbah = (val >> 24) & 0xff; 92 93 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 94 SATA_PMP_RW_TIMEOUT); 95 } 96 97 /** 98 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 99 * @qc: ATA command in question 100 * 101 * A host which has command switching PMP support cannot issue 102 * commands to multiple links simultaneously. 103 * 104 * LOCKING: 105 * spin_lock_irqsave(host lock) 106 * 107 * RETURNS: 108 * ATA_DEFER_* if deferring is needed, 0 otherwise. 109 */ 110 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 111 { 112 struct ata_link *link = qc->dev->link; 113 struct ata_port *ap = link->ap; 114 115 if (ap->excl_link == NULL || ap->excl_link == link) { 116 if (ap->nr_active_links == 0 || ata_link_active(link)) { 117 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 118 return ata_std_qc_defer(qc); 119 } 120 121 ap->excl_link = link; 122 } 123 124 return ATA_DEFER_PORT; 125 } 126 127 /** 128 * sata_pmp_scr_read - read PSCR 129 * @link: ATA link to read PSCR for 130 * @reg: PSCR to read 131 * @r_val: resulting value 132 * 133 * Read PSCR @reg into @r_val for @link, to be called from 134 * ata_scr_read(). 135 * 136 * LOCKING: 137 * Kernel thread context (may sleep). 138 * 139 * RETURNS: 140 * 0 on success, -errno on failure. 141 */ 142 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 143 { 144 unsigned int err_mask; 145 146 if (reg > SATA_PMP_PSCR_CONTROL) 147 return -EINVAL; 148 149 err_mask = sata_pmp_read(link, reg, r_val); 150 if (err_mask) { 151 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n", 152 reg, err_mask); 153 return -EIO; 154 } 155 return 0; 156 } 157 158 /** 159 * sata_pmp_scr_write - write PSCR 160 * @link: ATA link to write PSCR for 161 * @reg: PSCR to write 162 * @val: value to be written 163 * 164 * Write @val to PSCR @reg for @link, to be called from 165 * ata_scr_write() and ata_scr_write_flush(). 166 * 167 * LOCKING: 168 * Kernel thread context (may sleep). 169 * 170 * RETURNS: 171 * 0 on success, -errno on failure. 172 */ 173 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 174 { 175 unsigned int err_mask; 176 177 if (reg > SATA_PMP_PSCR_CONTROL) 178 return -EINVAL; 179 180 err_mask = sata_pmp_write(link, reg, val); 181 if (err_mask) { 182 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n", 183 reg, err_mask); 184 return -EIO; 185 } 186 return 0; 187 } 188 189 /** 190 * sata_pmp_set_lpm - configure LPM for a PMP link 191 * @link: PMP link to configure LPM for 192 * @policy: target LPM policy 193 * @hints: LPM hints 194 * 195 * Configure LPM for @link. This function will contain any PMP 196 * specific workarounds if necessary. 197 * 198 * LOCKING: 199 * EH context. 200 * 201 * RETURNS: 202 * 0 on success, -errno on failure. 203 */ 204 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, 205 unsigned hints) 206 { 207 return sata_link_scr_lpm(link, policy, true); 208 } 209 210 /** 211 * sata_pmp_read_gscr - read GSCR block of SATA PMP 212 * @dev: PMP device 213 * @gscr: buffer to read GSCR block into 214 * 215 * Read selected PMP GSCRs from the PMP at @dev. This will serve 216 * as configuration and identification info for the PMP. 217 * 218 * LOCKING: 219 * Kernel thread context (may sleep). 220 * 221 * RETURNS: 222 * 0 on success, -errno on failure. 223 */ 224 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 225 { 226 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 227 int i; 228 229 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 230 int reg = gscr_to_read[i]; 231 unsigned int err_mask; 232 233 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 234 if (err_mask) { 235 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n", 236 reg, err_mask); 237 return -EIO; 238 } 239 } 240 241 return 0; 242 } 243 244 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 245 { 246 u32 rev = gscr[SATA_PMP_GSCR_REV]; 247 248 if (rev & (1 << 3)) 249 return "1.2"; 250 if (rev & (1 << 2)) 251 return "1.1"; 252 if (rev & (1 << 1)) 253 return "1.0"; 254 return "<unknown>"; 255 } 256 257 #define PMP_GSCR_SII_POL 129 258 259 static int sata_pmp_configure(struct ata_device *dev, int print_info) 260 { 261 struct ata_port *ap = dev->link->ap; 262 u32 *gscr = dev->gscr; 263 u16 vendor = sata_pmp_gscr_vendor(gscr); 264 u16 devid = sata_pmp_gscr_devid(gscr); 265 unsigned int err_mask = 0; 266 const char *reason; 267 int nr_ports, rc; 268 269 nr_ports = sata_pmp_gscr_ports(gscr); 270 271 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 272 rc = -EINVAL; 273 reason = "invalid nr_ports"; 274 goto fail; 275 } 276 277 if ((ap->flags & ATA_FLAG_AN) && 278 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 279 dev->flags |= ATA_DFLAG_AN; 280 281 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 282 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 283 SERR_PHYRDY_CHG); 284 if (err_mask) { 285 rc = -EIO; 286 reason = "failed to write GSCR_ERROR_EN"; 287 goto fail; 288 } 289 290 /* Disable sending Early R_OK. 291 * With "cached read" HDD testing and multiple ports busy on a SATA 292 * host controller, 3x26 PMP will very rarely drop a deferred 293 * R_OK that was intended for the host. Symptom will be all 294 * 5 drives under test will timeout, get reset, and recover. 295 */ 296 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) { 297 u32 reg; 298 299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); 300 if (err_mask) { 301 rc = -EIO; 302 reason = "failed to read Sil3x26 Private Register"; 303 goto fail; 304 } 305 reg &= ~0x1; 306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); 307 if (err_mask) { 308 rc = -EIO; 309 reason = "failed to write Sil3x26 Private Register"; 310 goto fail; 311 } 312 } 313 314 if (print_info) { 315 ata_dev_info(dev, "Port Multiplier %s, " 316 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 317 sata_pmp_spec_rev_str(gscr), vendor, devid, 318 sata_pmp_gscr_rev(gscr), 319 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 320 gscr[SATA_PMP_GSCR_FEAT]); 321 322 if (!(dev->flags & ATA_DFLAG_AN)) 323 ata_dev_info(dev, 324 "Asynchronous notification not supported, " 325 "hotplug won't work on fan-out ports. Use warm-plug instead.\n"); 326 } 327 328 return 0; 329 330 fail: 331 ata_dev_err(dev, 332 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 333 reason, err_mask); 334 return rc; 335 } 336 337 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports) 338 { 339 struct ata_link *pmp_link = ap->pmp_link; 340 int i, err; 341 342 if (!pmp_link) { 343 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 344 GFP_NOIO); 345 if (!pmp_link) 346 return -ENOMEM; 347 348 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 349 ata_link_init(ap, &pmp_link[i], i); 350 351 ap->pmp_link = pmp_link; 352 353 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) { 354 err = ata_tlink_add(&pmp_link[i]); 355 if (err) { 356 goto err_tlink; 357 } 358 } 359 } 360 361 for (i = 0; i < nr_ports; i++) { 362 struct ata_link *link = &pmp_link[i]; 363 struct ata_eh_context *ehc = &link->eh_context; 364 365 link->flags = 0; 366 ehc->i.probe_mask |= ATA_ALL_DEVICES; 367 ehc->i.action |= ATA_EH_RESET; 368 } 369 370 return 0; 371 err_tlink: 372 while (--i >= 0) 373 ata_tlink_delete(&pmp_link[i]); 374 kfree(pmp_link); 375 ap->pmp_link = NULL; 376 return err; 377 } 378 379 static void sata_pmp_quirks(struct ata_port *ap) 380 { 381 u32 *gscr = ap->link.device->gscr; 382 u16 vendor = sata_pmp_gscr_vendor(gscr); 383 u16 devid = sata_pmp_gscr_devid(gscr); 384 struct ata_link *link; 385 386 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) { 387 /* sil3x26 quirks */ 388 ata_for_each_link(link, ap, EDGE) { 389 /* link reports offline after LPM */ 390 link->flags |= ATA_LFLAG_NO_LPM; 391 392 /* 393 * Class code report is unreliable and SRST times 394 * out under certain configurations. 395 */ 396 if (link->pmp < 5) 397 link->flags |= ATA_LFLAG_NO_SRST | 398 ATA_LFLAG_ASSUME_ATA; 399 400 /* port 5 is for SEMB device and it doesn't like SRST */ 401 if (link->pmp == 5) 402 link->flags |= ATA_LFLAG_NO_SRST | 403 ATA_LFLAG_ASSUME_SEMB; 404 } 405 } else if (vendor == 0x1095 && devid == 0x4723) { 406 /* 407 * sil4723 quirks 408 * 409 * Link reports offline after LPM. Class code report is 410 * unreliable. SIMG PMPs never got SRST reliable and the 411 * config device at port 2 locks up on SRST. 412 */ 413 ata_for_each_link(link, ap, EDGE) 414 link->flags |= ATA_LFLAG_NO_LPM | 415 ATA_LFLAG_NO_SRST | 416 ATA_LFLAG_ASSUME_ATA; 417 } else if (vendor == 0x1095 && devid == 0x4726) { 418 /* sil4726 quirks */ 419 ata_for_each_link(link, ap, EDGE) { 420 /* link reports offline after LPM */ 421 link->flags |= ATA_LFLAG_NO_LPM; 422 423 /* Class code report is unreliable and SRST 424 * times out under certain configurations. 425 * Config device can be at port 0 or 5 and 426 * locks up on SRST. 427 */ 428 if (link->pmp <= 5) 429 link->flags |= ATA_LFLAG_NO_SRST | 430 ATA_LFLAG_ASSUME_ATA; 431 432 /* Port 6 is for SEMB device which doesn't 433 * like SRST either. 434 */ 435 if (link->pmp == 6) 436 link->flags |= ATA_LFLAG_NO_SRST | 437 ATA_LFLAG_ASSUME_SEMB; 438 } 439 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 440 devid == 0x5734 || devid == 0x5744)) { 441 /* sil5723/5744 quirks */ 442 443 /* sil5723/5744 has either two or three downstream 444 * ports depending on operation mode. The last port 445 * is empty if any actual IO device is available or 446 * occupied by a pseudo configuration device 447 * otherwise. Don't try hard to recover it. 448 */ 449 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 450 } else if (vendor == 0x197b && devid == 0x2352) { 451 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */ 452 ata_for_each_link(link, ap, EDGE) { 453 /* SRST breaks detection and disks get misclassified 454 * LPM disabled to avoid potential problems 455 */ 456 link->flags |= ATA_LFLAG_NO_LPM | 457 ATA_LFLAG_NO_SRST | 458 ATA_LFLAG_ASSUME_ATA; 459 } 460 } 461 } 462 463 /** 464 * sata_pmp_attach - attach a SATA PMP device 465 * @dev: SATA PMP device to attach 466 * 467 * Configure and attach SATA PMP device @dev. This function is 468 * also responsible for allocating and initializing PMP links. 469 * 470 * LOCKING: 471 * Kernel thread context (may sleep). 472 * 473 * RETURNS: 474 * 0 on success, -errno on failure. 475 */ 476 int sata_pmp_attach(struct ata_device *dev) 477 { 478 struct ata_link *link = dev->link; 479 struct ata_port *ap = link->ap; 480 unsigned long flags; 481 struct ata_link *tlink; 482 int rc; 483 484 /* is it hanging off the right place? */ 485 if (!sata_pmp_supported(ap)) { 486 ata_dev_err(dev, "host does not support Port Multiplier\n"); 487 return -EINVAL; 488 } 489 490 if (!ata_is_host_link(link)) { 491 ata_dev_err(dev, "Port Multipliers cannot be nested\n"); 492 return -EINVAL; 493 } 494 495 if (dev->devno) { 496 ata_dev_err(dev, "Port Multiplier must be the first device\n"); 497 return -EINVAL; 498 } 499 500 WARN_ON(link->pmp != 0); 501 link->pmp = SATA_PMP_CTRL_PORT; 502 503 /* read GSCR block */ 504 rc = sata_pmp_read_gscr(dev, dev->gscr); 505 if (rc) 506 goto fail; 507 508 /* config PMP */ 509 rc = sata_pmp_configure(dev, 1); 510 if (rc) 511 goto fail; 512 513 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 514 if (rc) { 515 ata_dev_info(dev, "failed to initialize PMP links\n"); 516 goto fail; 517 } 518 519 /* attach it */ 520 spin_lock_irqsave(ap->lock, flags); 521 WARN_ON(ap->nr_pmp_links); 522 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 523 spin_unlock_irqrestore(ap->lock, flags); 524 525 sata_pmp_quirks(ap); 526 527 if (ap->ops->pmp_attach) 528 ap->ops->pmp_attach(ap); 529 530 ata_for_each_link(tlink, ap, EDGE) 531 sata_link_init_spd(tlink); 532 533 return 0; 534 535 fail: 536 link->pmp = 0; 537 return rc; 538 } 539 540 /** 541 * sata_pmp_detach - detach a SATA PMP device 542 * @dev: SATA PMP device to detach 543 * 544 * Detach SATA PMP device @dev. This function is also 545 * responsible for deconfiguring PMP links. 546 * 547 * LOCKING: 548 * Kernel thread context (may sleep). 549 */ 550 static void sata_pmp_detach(struct ata_device *dev) 551 { 552 struct ata_link *link = dev->link; 553 struct ata_port *ap = link->ap; 554 struct ata_link *tlink; 555 unsigned long flags; 556 557 ata_dev_info(dev, "Port Multiplier detaching\n"); 558 559 WARN_ON(!ata_is_host_link(link) || dev->devno || 560 link->pmp != SATA_PMP_CTRL_PORT); 561 562 if (ap->ops->pmp_detach) 563 ap->ops->pmp_detach(ap); 564 565 ata_for_each_link(tlink, ap, EDGE) 566 ata_eh_detach_dev(tlink->device); 567 568 spin_lock_irqsave(ap->lock, flags); 569 ap->nr_pmp_links = 0; 570 link->pmp = 0; 571 spin_unlock_irqrestore(ap->lock, flags); 572 } 573 574 /** 575 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 576 * @dev: PMP device to compare against 577 * @new_gscr: GSCR block of the new device 578 * 579 * Compare @new_gscr against @dev and determine whether @dev is 580 * the PMP described by @new_gscr. 581 * 582 * LOCKING: 583 * None. 584 * 585 * RETURNS: 586 * 1 if @dev matches @new_gscr, 0 otherwise. 587 */ 588 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 589 { 590 const u32 *old_gscr = dev->gscr; 591 u16 old_vendor, new_vendor, old_devid, new_devid; 592 int old_nr_ports, new_nr_ports; 593 594 old_vendor = sata_pmp_gscr_vendor(old_gscr); 595 new_vendor = sata_pmp_gscr_vendor(new_gscr); 596 old_devid = sata_pmp_gscr_devid(old_gscr); 597 new_devid = sata_pmp_gscr_devid(new_gscr); 598 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 599 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 600 601 if (old_vendor != new_vendor) { 602 ata_dev_info(dev, 603 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n", 604 old_vendor, new_vendor); 605 return 0; 606 } 607 608 if (old_devid != new_devid) { 609 ata_dev_info(dev, 610 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n", 611 old_devid, new_devid); 612 return 0; 613 } 614 615 if (old_nr_ports != new_nr_ports) { 616 ata_dev_info(dev, 617 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n", 618 old_nr_ports, new_nr_ports); 619 return 0; 620 } 621 622 return 1; 623 } 624 625 /** 626 * sata_pmp_revalidate - revalidate SATA PMP 627 * @dev: PMP device to revalidate 628 * @new_class: new class code 629 * 630 * Re-read GSCR block and make sure @dev is still attached to the 631 * port and properly configured. 632 * 633 * LOCKING: 634 * Kernel thread context (may sleep). 635 * 636 * RETURNS: 637 * 0 on success, -errno otherwise. 638 */ 639 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 640 { 641 struct ata_link *link = dev->link; 642 struct ata_port *ap = link->ap; 643 u32 *gscr = (void *)ap->sector_buf; 644 int rc; 645 646 DPRINTK("ENTER\n"); 647 648 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 649 650 if (!ata_dev_enabled(dev)) { 651 rc = -ENODEV; 652 goto fail; 653 } 654 655 /* wrong class? */ 656 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 657 rc = -ENODEV; 658 goto fail; 659 } 660 661 /* read GSCR */ 662 rc = sata_pmp_read_gscr(dev, gscr); 663 if (rc) 664 goto fail; 665 666 /* is the pmp still there? */ 667 if (!sata_pmp_same_pmp(dev, gscr)) { 668 rc = -ENODEV; 669 goto fail; 670 } 671 672 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 673 674 rc = sata_pmp_configure(dev, 0); 675 if (rc) 676 goto fail; 677 678 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 679 680 DPRINTK("EXIT, rc=0\n"); 681 return 0; 682 683 fail: 684 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc); 685 DPRINTK("EXIT, rc=%d\n", rc); 686 return rc; 687 } 688 689 /** 690 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 691 * @dev: PMP device to revalidate 692 * 693 * Make sure the attached PMP is accessible. 694 * 695 * LOCKING: 696 * Kernel thread context (may sleep). 697 * 698 * RETURNS: 699 * 0 on success, -errno otherwise. 700 */ 701 static int sata_pmp_revalidate_quick(struct ata_device *dev) 702 { 703 unsigned int err_mask; 704 u32 prod_id; 705 706 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 707 if (err_mask) { 708 ata_dev_err(dev, 709 "failed to read PMP product ID (Emask=0x%x)\n", 710 err_mask); 711 return -EIO; 712 } 713 714 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 715 ata_dev_err(dev, "PMP product ID mismatch\n"); 716 /* something weird is going on, request full PMP recovery */ 717 return -EIO; 718 } 719 720 return 0; 721 } 722 723 /** 724 * sata_pmp_eh_recover_pmp - recover PMP 725 * @ap: ATA port PMP is attached to 726 * @prereset: prereset method (can be NULL) 727 * @softreset: softreset method 728 * @hardreset: hardreset method 729 * @postreset: postreset method (can be NULL) 730 * 731 * Recover PMP attached to @ap. Recovery procedure is somewhat 732 * similar to that of ata_eh_recover() except that reset should 733 * always be performed in hard->soft sequence and recovery 734 * failure results in PMP detachment. 735 * 736 * LOCKING: 737 * Kernel thread context (may sleep). 738 * 739 * RETURNS: 740 * 0 on success, -errno on failure. 741 */ 742 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 743 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 744 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 745 { 746 struct ata_link *link = &ap->link; 747 struct ata_eh_context *ehc = &link->eh_context; 748 struct ata_device *dev = link->device; 749 int tries = ATA_EH_PMP_TRIES; 750 int detach = 0, rc = 0; 751 int reval_failed = 0; 752 753 DPRINTK("ENTER\n"); 754 755 if (dev->flags & ATA_DFLAG_DETACH) { 756 detach = 1; 757 goto fail; 758 } 759 760 retry: 761 ehc->classes[0] = ATA_DEV_UNKNOWN; 762 763 if (ehc->i.action & ATA_EH_RESET) { 764 struct ata_link *tlink; 765 766 /* reset */ 767 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 768 postreset); 769 if (rc) { 770 ata_link_err(link, "failed to reset PMP, giving up\n"); 771 goto fail; 772 } 773 774 /* PMP is reset, SErrors cannot be trusted, scan all */ 775 ata_for_each_link(tlink, ap, EDGE) { 776 struct ata_eh_context *ehc = &tlink->eh_context; 777 778 ehc->i.probe_mask |= ATA_ALL_DEVICES; 779 ehc->i.action |= ATA_EH_RESET; 780 } 781 } 782 783 /* If revalidation is requested, revalidate and reconfigure; 784 * otherwise, do quick revalidation. 785 */ 786 if (ehc->i.action & ATA_EH_REVALIDATE) 787 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 788 else 789 rc = sata_pmp_revalidate_quick(dev); 790 791 if (rc) { 792 tries--; 793 794 if (rc == -ENODEV) { 795 ehc->i.probe_mask |= ATA_ALL_DEVICES; 796 detach = 1; 797 /* give it just two more chances */ 798 tries = min(tries, 2); 799 } 800 801 if (tries) { 802 /* consecutive revalidation failures? speed down */ 803 if (reval_failed) 804 sata_down_spd_limit(link, 0); 805 else 806 reval_failed = 1; 807 808 ehc->i.action |= ATA_EH_RESET; 809 goto retry; 810 } else { 811 ata_dev_err(dev, 812 "failed to recover PMP after %d tries, giving up\n", 813 ATA_EH_PMP_TRIES); 814 goto fail; 815 } 816 } 817 818 /* okay, PMP resurrected */ 819 ehc->i.flags = 0; 820 821 DPRINTK("EXIT, rc=0\n"); 822 return 0; 823 824 fail: 825 sata_pmp_detach(dev); 826 if (detach) 827 ata_eh_detach_dev(dev); 828 else 829 ata_dev_disable(dev); 830 831 DPRINTK("EXIT, rc=%d\n", rc); 832 return rc; 833 } 834 835 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 836 { 837 struct ata_link *link; 838 unsigned long flags; 839 int rc; 840 841 spin_lock_irqsave(ap->lock, flags); 842 843 ata_for_each_link(link, ap, EDGE) { 844 if (!(link->flags & ATA_LFLAG_DISABLED)) 845 continue; 846 847 spin_unlock_irqrestore(ap->lock, flags); 848 849 /* Some PMPs require hardreset sequence to get 850 * SError.N working. 851 */ 852 sata_link_hardreset(link, sata_deb_timing_normal, 853 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 854 NULL, NULL); 855 856 /* unconditionally clear SError.N */ 857 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 858 if (rc) { 859 ata_link_err(link, 860 "failed to clear SError.N (errno=%d)\n", 861 rc); 862 return rc; 863 } 864 865 spin_lock_irqsave(ap->lock, flags); 866 } 867 868 spin_unlock_irqrestore(ap->lock, flags); 869 870 return 0; 871 } 872 873 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 874 { 875 struct ata_port *ap = link->ap; 876 unsigned long flags; 877 878 if (link_tries[link->pmp] && --link_tries[link->pmp]) 879 return 1; 880 881 /* disable this link */ 882 if (!(link->flags & ATA_LFLAG_DISABLED)) { 883 ata_link_warn(link, 884 "failed to recover link after %d tries, disabling\n", 885 ATA_EH_PMP_LINK_TRIES); 886 887 spin_lock_irqsave(ap->lock, flags); 888 link->flags |= ATA_LFLAG_DISABLED; 889 spin_unlock_irqrestore(ap->lock, flags); 890 } 891 892 ata_dev_disable(link->device); 893 link->eh_context.i.action = 0; 894 895 return 0; 896 } 897 898 /** 899 * sata_pmp_eh_recover - recover PMP-enabled port 900 * @ap: ATA port to recover 901 * 902 * Drive EH recovery operation for PMP enabled port @ap. This 903 * function recovers host and PMP ports with proper retrials and 904 * fallbacks. Actual recovery operations are performed using 905 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 906 * 907 * LOCKING: 908 * Kernel thread context (may sleep). 909 * 910 * RETURNS: 911 * 0 on success, -errno on failure. 912 */ 913 static int sata_pmp_eh_recover(struct ata_port *ap) 914 { 915 struct ata_port_operations *ops = ap->ops; 916 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 917 struct ata_link *pmp_link = &ap->link; 918 struct ata_device *pmp_dev = pmp_link->device; 919 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 920 u32 *gscr = pmp_dev->gscr; 921 struct ata_link *link; 922 struct ata_device *dev; 923 unsigned int err_mask; 924 u32 gscr_error, sntf; 925 int cnt, rc; 926 927 pmp_tries = ATA_EH_PMP_TRIES; 928 ata_for_each_link(link, ap, EDGE) 929 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 930 931 retry: 932 /* PMP attached? */ 933 if (!sata_pmp_attached(ap)) { 934 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 935 ops->hardreset, ops->postreset, NULL); 936 if (rc) { 937 ata_for_each_dev(dev, &ap->link, ALL) 938 ata_dev_disable(dev); 939 return rc; 940 } 941 942 if (pmp_dev->class != ATA_DEV_PMP) 943 return 0; 944 945 /* new PMP online */ 946 ata_for_each_link(link, ap, EDGE) 947 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 948 949 /* fall through */ 950 } 951 952 /* recover pmp */ 953 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 954 ops->hardreset, ops->postreset); 955 if (rc) 956 goto pmp_fail; 957 958 /* PHY event notification can disturb reset and other recovery 959 * operations. Turn it off. 960 */ 961 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 962 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 963 964 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 965 gscr[SATA_PMP_GSCR_FEAT_EN]); 966 if (err_mask) { 967 ata_link_warn(pmp_link, 968 "failed to disable NOTIFY (err_mask=0x%x)\n", 969 err_mask); 970 goto pmp_fail; 971 } 972 } 973 974 /* handle disabled links */ 975 rc = sata_pmp_eh_handle_disabled_links(ap); 976 if (rc) 977 goto pmp_fail; 978 979 /* recover links */ 980 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 981 ops->pmp_hardreset, ops->pmp_postreset, &link); 982 if (rc) 983 goto link_fail; 984 985 /* clear SNotification */ 986 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 987 if (rc == 0) 988 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 989 990 /* 991 * If LPM is active on any fan-out port, hotplug wouldn't 992 * work. Return w/ PHY event notification disabled. 993 */ 994 ata_for_each_link(link, ap, EDGE) 995 if (link->lpm_policy > ATA_LPM_MAX_POWER) 996 return 0; 997 998 /* 999 * Connection status might have changed while resetting other 1000 * links, enable notification and check SATA_PMP_GSCR_ERROR 1001 * before returning. 1002 */ 1003 1004 /* enable notification */ 1005 if (pmp_dev->flags & ATA_DFLAG_AN) { 1006 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1007 1008 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 1009 gscr[SATA_PMP_GSCR_FEAT_EN]); 1010 if (err_mask) { 1011 ata_dev_err(pmp_dev, 1012 "failed to write PMP_FEAT_EN (Emask=0x%x)\n", 1013 err_mask); 1014 rc = -EIO; 1015 goto pmp_fail; 1016 } 1017 } 1018 1019 /* check GSCR_ERROR */ 1020 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1021 if (err_mask) { 1022 ata_dev_err(pmp_dev, 1023 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n", 1024 err_mask); 1025 rc = -EIO; 1026 goto pmp_fail; 1027 } 1028 1029 cnt = 0; 1030 ata_for_each_link(link, ap, EDGE) { 1031 if (!(gscr_error & (1 << link->pmp))) 1032 continue; 1033 1034 if (sata_pmp_handle_link_fail(link, link_tries)) { 1035 ata_ehi_hotplugged(&link->eh_context.i); 1036 cnt++; 1037 } else { 1038 ata_link_warn(link, 1039 "PHY status changed but maxed out on retries, giving up\n"); 1040 ata_link_warn(link, 1041 "Manually issue scan to resume this link\n"); 1042 } 1043 } 1044 1045 if (cnt) { 1046 ata_port_info(ap, 1047 "PMP SError.N set for some ports, repeating recovery\n"); 1048 goto retry; 1049 } 1050 1051 return 0; 1052 1053 link_fail: 1054 if (sata_pmp_handle_link_fail(link, link_tries)) { 1055 pmp_ehc->i.action |= ATA_EH_RESET; 1056 goto retry; 1057 } 1058 1059 /* fall through */ 1060 pmp_fail: 1061 /* Control always ends up here after detaching PMP. Shut up 1062 * and return if we're unloading. 1063 */ 1064 if (ap->pflags & ATA_PFLAG_UNLOADING) 1065 return rc; 1066 1067 if (!sata_pmp_attached(ap)) 1068 goto retry; 1069 1070 if (--pmp_tries) { 1071 pmp_ehc->i.action |= ATA_EH_RESET; 1072 goto retry; 1073 } 1074 1075 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n", 1076 ATA_EH_PMP_TRIES); 1077 sata_pmp_detach(pmp_dev); 1078 ata_dev_disable(pmp_dev); 1079 1080 return rc; 1081 } 1082 1083 /** 1084 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1085 * @ap: host port to handle error for 1086 * 1087 * Perform standard error handling sequence for PMP-enabled host 1088 * @ap. 1089 * 1090 * LOCKING: 1091 * Kernel thread context (may sleep). 1092 */ 1093 void sata_pmp_error_handler(struct ata_port *ap) 1094 { 1095 ata_eh_autopsy(ap); 1096 ata_eh_report(ap); 1097 sata_pmp_eh_recover(ap); 1098 ata_eh_finish(ap); 1099 } 1100 1101 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1102 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1103 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1104