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 17const 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 */ 39static 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 */ 76static 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 */ 110int 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 */ 142int 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 */ 173int 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 */ 204int 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 */ 224static 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 244static 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 259static 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, 3726 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) { 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 Sil3726 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 Sil3726 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 337static 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 379static 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) { 387 /* sil3726 quirks */ 388 ata_for_each_link(link, ap, EDGE) { 389 /* link reports offline after LPM */ 390 link->flags |= ATA_LFLAG_NO_LPM; 391 392 /* Class code report is unreliable. */ 393 if (link->pmp < 5) 394 link->flags |= ATA_LFLAG_ASSUME_ATA; 395 396 /* port 5 is for SEMB device and it doesn't like SRST */ 397 if (link->pmp == 5) 398 link->flags |= ATA_LFLAG_NO_SRST | 399 ATA_LFLAG_ASSUME_SEMB; 400 } 401 } else if (vendor == 0x1095 && devid == 0x4723) { 402 /* sil4723 quirks */ 403 ata_for_each_link(link, ap, EDGE) { 404 /* link reports offline after LPM */ 405 link->flags |= ATA_LFLAG_NO_LPM; 406 407 /* class code report is unreliable */ 408 if (link->pmp < 2) 409 link->flags |= ATA_LFLAG_ASSUME_ATA; 410 411 /* the config device at port 2 locks up on SRST */ 412 if (link->pmp == 2) 413 link->flags |= ATA_LFLAG_NO_SRST | 414 ATA_LFLAG_ASSUME_ATA; 415 } 416 } else if (vendor == 0x1095 && devid == 0x4726) { 417 /* sil4726 quirks */ 418 ata_for_each_link(link, ap, EDGE) { 419 /* link reports offline after LPM */ 420 link->flags |= ATA_LFLAG_NO_LPM; 421 422 /* Class code report is unreliable and SRST 423 * times out under certain configurations. 424 * Config device can be at port 0 or 5 and 425 * locks up on SRST. 426 */ 427 if (link->pmp <= 5) 428 link->flags |= ATA_LFLAG_NO_SRST | 429 ATA_LFLAG_ASSUME_ATA; 430 431 /* Port 6 is for SEMB device which doesn't 432 * like SRST either. 433 */ 434 if (link->pmp == 6) 435 link->flags |= ATA_LFLAG_NO_SRST | 436 ATA_LFLAG_ASSUME_SEMB; 437 } 438 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 439 devid == 0x5734 || devid == 0x5744)) { 440 /* sil5723/5744 quirks */ 441 442 /* sil5723/5744 has either two or three downstream 443 * ports depending on operation mode. The last port 444 * is empty if any actual IO device is available or 445 * occupied by a pseudo configuration device 446 * otherwise. Don't try hard to recover it. 447 */ 448 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 449 } else if (vendor == 0x197b && devid == 0x2352) { 450 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */ 451 ata_for_each_link(link, ap, EDGE) { 452 /* SRST breaks detection and disks get misclassified 453 * LPM disabled to avoid potential problems 454 */ 455 link->flags |= ATA_LFLAG_NO_LPM | 456 ATA_LFLAG_NO_SRST | 457 ATA_LFLAG_ASSUME_ATA; 458 } 459 } 460} 461 462/** 463 * sata_pmp_attach - attach a SATA PMP device 464 * @dev: SATA PMP device to attach 465 * 466 * Configure and attach SATA PMP device @dev. This function is 467 * also responsible for allocating and initializing PMP links. 468 * 469 * LOCKING: 470 * Kernel thread context (may sleep). 471 * 472 * RETURNS: 473 * 0 on success, -errno on failure. 474 */ 475int sata_pmp_attach(struct ata_device *dev) 476{ 477 struct ata_link *link = dev->link; 478 struct ata_port *ap = link->ap; 479 unsigned long flags; 480 struct ata_link *tlink; 481 int rc; 482 483 /* is it hanging off the right place? */ 484 if (!sata_pmp_supported(ap)) { 485 ata_dev_err(dev, "host does not support Port Multiplier\n"); 486 return -EINVAL; 487 } 488 489 if (!ata_is_host_link(link)) { 490 ata_dev_err(dev, "Port Multipliers cannot be nested\n"); 491 return -EINVAL; 492 } 493 494 if (dev->devno) { 495 ata_dev_err(dev, "Port Multiplier must be the first device\n"); 496 return -EINVAL; 497 } 498 499 WARN_ON(link->pmp != 0); 500 link->pmp = SATA_PMP_CTRL_PORT; 501 502 /* read GSCR block */ 503 rc = sata_pmp_read_gscr(dev, dev->gscr); 504 if (rc) 505 goto fail; 506 507 /* config PMP */ 508 rc = sata_pmp_configure(dev, 1); 509 if (rc) 510 goto fail; 511 512 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 513 if (rc) { 514 ata_dev_info(dev, "failed to initialize PMP links\n"); 515 goto fail; 516 } 517 518 /* attach it */ 519 spin_lock_irqsave(ap->lock, flags); 520 WARN_ON(ap->nr_pmp_links); 521 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 522 spin_unlock_irqrestore(ap->lock, flags); 523 524 sata_pmp_quirks(ap); 525 526 if (ap->ops->pmp_attach) 527 ap->ops->pmp_attach(ap); 528 529 ata_for_each_link(tlink, ap, EDGE) 530 sata_link_init_spd(tlink); 531 532 ata_acpi_associate_sata_port(ap); 533 534 return 0; 535 536 fail: 537 link->pmp = 0; 538 return rc; 539} 540 541/** 542 * sata_pmp_detach - detach a SATA PMP device 543 * @dev: SATA PMP device to detach 544 * 545 * Detach SATA PMP device @dev. This function is also 546 * responsible for deconfiguring PMP links. 547 * 548 * LOCKING: 549 * Kernel thread context (may sleep). 550 */ 551static void sata_pmp_detach(struct ata_device *dev) 552{ 553 struct ata_link *link = dev->link; 554 struct ata_port *ap = link->ap; 555 struct ata_link *tlink; 556 unsigned long flags; 557 558 ata_dev_info(dev, "Port Multiplier detaching\n"); 559 560 WARN_ON(!ata_is_host_link(link) || dev->devno || 561 link->pmp != SATA_PMP_CTRL_PORT); 562 563 if (ap->ops->pmp_detach) 564 ap->ops->pmp_detach(ap); 565 566 ata_for_each_link(tlink, ap, EDGE) 567 ata_eh_detach_dev(tlink->device); 568 569 spin_lock_irqsave(ap->lock, flags); 570 ap->nr_pmp_links = 0; 571 link->pmp = 0; 572 spin_unlock_irqrestore(ap->lock, flags); 573 574 ata_acpi_associate_sata_port(ap); 575} 576 577/** 578 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 579 * @dev: PMP device to compare against 580 * @new_gscr: GSCR block of the new device 581 * 582 * Compare @new_gscr against @dev and determine whether @dev is 583 * the PMP described by @new_gscr. 584 * 585 * LOCKING: 586 * None. 587 * 588 * RETURNS: 589 * 1 if @dev matches @new_gscr, 0 otherwise. 590 */ 591static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 592{ 593 const u32 *old_gscr = dev->gscr; 594 u16 old_vendor, new_vendor, old_devid, new_devid; 595 int old_nr_ports, new_nr_ports; 596 597 old_vendor = sata_pmp_gscr_vendor(old_gscr); 598 new_vendor = sata_pmp_gscr_vendor(new_gscr); 599 old_devid = sata_pmp_gscr_devid(old_gscr); 600 new_devid = sata_pmp_gscr_devid(new_gscr); 601 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 602 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 603 604 if (old_vendor != new_vendor) { 605 ata_dev_info(dev, 606 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n", 607 old_vendor, new_vendor); 608 return 0; 609 } 610 611 if (old_devid != new_devid) { 612 ata_dev_info(dev, 613 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n", 614 old_devid, new_devid); 615 return 0; 616 } 617 618 if (old_nr_ports != new_nr_ports) { 619 ata_dev_info(dev, 620 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n", 621 old_nr_ports, new_nr_ports); 622 return 0; 623 } 624 625 return 1; 626} 627 628/** 629 * sata_pmp_revalidate - revalidate SATA PMP 630 * @dev: PMP device to revalidate 631 * @new_class: new class code 632 * 633 * Re-read GSCR block and make sure @dev is still attached to the 634 * port and properly configured. 635 * 636 * LOCKING: 637 * Kernel thread context (may sleep). 638 * 639 * RETURNS: 640 * 0 on success, -errno otherwise. 641 */ 642static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 643{ 644 struct ata_link *link = dev->link; 645 struct ata_port *ap = link->ap; 646 u32 *gscr = (void *)ap->sector_buf; 647 int rc; 648 649 DPRINTK("ENTER\n"); 650 651 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 652 653 if (!ata_dev_enabled(dev)) { 654 rc = -ENODEV; 655 goto fail; 656 } 657 658 /* wrong class? */ 659 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 660 rc = -ENODEV; 661 goto fail; 662 } 663 664 /* read GSCR */ 665 rc = sata_pmp_read_gscr(dev, gscr); 666 if (rc) 667 goto fail; 668 669 /* is the pmp still there? */ 670 if (!sata_pmp_same_pmp(dev, gscr)) { 671 rc = -ENODEV; 672 goto fail; 673 } 674 675 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 676 677 rc = sata_pmp_configure(dev, 0); 678 if (rc) 679 goto fail; 680 681 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 682 683 DPRINTK("EXIT, rc=0\n"); 684 return 0; 685 686 fail: 687 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc); 688 DPRINTK("EXIT, rc=%d\n", rc); 689 return rc; 690} 691 692/** 693 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 694 * @dev: PMP device to revalidate 695 * 696 * Make sure the attached PMP is accessible. 697 * 698 * LOCKING: 699 * Kernel thread context (may sleep). 700 * 701 * RETURNS: 702 * 0 on success, -errno otherwise. 703 */ 704static int sata_pmp_revalidate_quick(struct ata_device *dev) 705{ 706 unsigned int err_mask; 707 u32 prod_id; 708 709 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 710 if (err_mask) { 711 ata_dev_err(dev, 712 "failed to read PMP product ID (Emask=0x%x)\n", 713 err_mask); 714 return -EIO; 715 } 716 717 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 718 ata_dev_err(dev, "PMP product ID mismatch\n"); 719 /* something weird is going on, request full PMP recovery */ 720 return -EIO; 721 } 722 723 return 0; 724} 725 726/** 727 * sata_pmp_eh_recover_pmp - recover PMP 728 * @ap: ATA port PMP is attached to 729 * @prereset: prereset method (can be NULL) 730 * @softreset: softreset method 731 * @hardreset: hardreset method 732 * @postreset: postreset method (can be NULL) 733 * 734 * Recover PMP attached to @ap. Recovery procedure is somewhat 735 * similar to that of ata_eh_recover() except that reset should 736 * always be performed in hard->soft sequence and recovery 737 * failure results in PMP detachment. 738 * 739 * LOCKING: 740 * Kernel thread context (may sleep). 741 * 742 * RETURNS: 743 * 0 on success, -errno on failure. 744 */ 745static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 746 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 747 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 748{ 749 struct ata_link *link = &ap->link; 750 struct ata_eh_context *ehc = &link->eh_context; 751 struct ata_device *dev = link->device; 752 int tries = ATA_EH_PMP_TRIES; 753 int detach = 0, rc = 0; 754 int reval_failed = 0; 755 756 DPRINTK("ENTER\n"); 757 758 if (dev->flags & ATA_DFLAG_DETACH) { 759 detach = 1; 760 goto fail; 761 } 762 763 retry: 764 ehc->classes[0] = ATA_DEV_UNKNOWN; 765 766 if (ehc->i.action & ATA_EH_RESET) { 767 struct ata_link *tlink; 768 769 /* reset */ 770 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 771 postreset); 772 if (rc) { 773 ata_link_err(link, "failed to reset PMP, giving up\n"); 774 goto fail; 775 } 776 777 /* PMP is reset, SErrors cannot be trusted, scan all */ 778 ata_for_each_link(tlink, ap, EDGE) { 779 struct ata_eh_context *ehc = &tlink->eh_context; 780 781 ehc->i.probe_mask |= ATA_ALL_DEVICES; 782 ehc->i.action |= ATA_EH_RESET; 783 } 784 } 785 786 /* If revalidation is requested, revalidate and reconfigure; 787 * otherwise, do quick revalidation. 788 */ 789 if (ehc->i.action & ATA_EH_REVALIDATE) 790 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 791 else 792 rc = sata_pmp_revalidate_quick(dev); 793 794 if (rc) { 795 tries--; 796 797 if (rc == -ENODEV) { 798 ehc->i.probe_mask |= ATA_ALL_DEVICES; 799 detach = 1; 800 /* give it just two more chances */ 801 tries = min(tries, 2); 802 } 803 804 if (tries) { 805 /* consecutive revalidation failures? speed down */ 806 if (reval_failed) 807 sata_down_spd_limit(link, 0); 808 else 809 reval_failed = 1; 810 811 ehc->i.action |= ATA_EH_RESET; 812 goto retry; 813 } else { 814 ata_dev_err(dev, 815 "failed to recover PMP after %d tries, giving up\n", 816 ATA_EH_PMP_TRIES); 817 goto fail; 818 } 819 } 820 821 /* okay, PMP resurrected */ 822 ehc->i.flags = 0; 823 824 DPRINTK("EXIT, rc=0\n"); 825 return 0; 826 827 fail: 828 sata_pmp_detach(dev); 829 if (detach) 830 ata_eh_detach_dev(dev); 831 else 832 ata_dev_disable(dev); 833 834 DPRINTK("EXIT, rc=%d\n", rc); 835 return rc; 836} 837 838static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 839{ 840 struct ata_link *link; 841 unsigned long flags; 842 int rc; 843 844 spin_lock_irqsave(ap->lock, flags); 845 846 ata_for_each_link(link, ap, EDGE) { 847 if (!(link->flags & ATA_LFLAG_DISABLED)) 848 continue; 849 850 spin_unlock_irqrestore(ap->lock, flags); 851 852 /* Some PMPs require hardreset sequence to get 853 * SError.N working. 854 */ 855 sata_link_hardreset(link, sata_deb_timing_normal, 856 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 857 NULL, NULL); 858 859 /* unconditionally clear SError.N */ 860 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 861 if (rc) { 862 ata_link_err(link, 863 "failed to clear SError.N (errno=%d)\n", 864 rc); 865 return rc; 866 } 867 868 spin_lock_irqsave(ap->lock, flags); 869 } 870 871 spin_unlock_irqrestore(ap->lock, flags); 872 873 return 0; 874} 875 876static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 877{ 878 struct ata_port *ap = link->ap; 879 unsigned long flags; 880 881 if (link_tries[link->pmp] && --link_tries[link->pmp]) 882 return 1; 883 884 /* disable this link */ 885 if (!(link->flags & ATA_LFLAG_DISABLED)) { 886 ata_link_warn(link, 887 "failed to recover link after %d tries, disabling\n", 888 ATA_EH_PMP_LINK_TRIES); 889 890 spin_lock_irqsave(ap->lock, flags); 891 link->flags |= ATA_LFLAG_DISABLED; 892 spin_unlock_irqrestore(ap->lock, flags); 893 } 894 895 ata_dev_disable(link->device); 896 link->eh_context.i.action = 0; 897 898 return 0; 899} 900 901/** 902 * sata_pmp_eh_recover - recover PMP-enabled port 903 * @ap: ATA port to recover 904 * 905 * Drive EH recovery operation for PMP enabled port @ap. This 906 * function recovers host and PMP ports with proper retrials and 907 * fallbacks. Actual recovery operations are performed using 908 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 909 * 910 * LOCKING: 911 * Kernel thread context (may sleep). 912 * 913 * RETURNS: 914 * 0 on success, -errno on failure. 915 */ 916static int sata_pmp_eh_recover(struct ata_port *ap) 917{ 918 struct ata_port_operations *ops = ap->ops; 919 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 920 struct ata_link *pmp_link = &ap->link; 921 struct ata_device *pmp_dev = pmp_link->device; 922 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 923 u32 *gscr = pmp_dev->gscr; 924 struct ata_link *link; 925 struct ata_device *dev; 926 unsigned int err_mask; 927 u32 gscr_error, sntf; 928 int cnt, rc; 929 930 pmp_tries = ATA_EH_PMP_TRIES; 931 ata_for_each_link(link, ap, EDGE) 932 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 933 934 retry: 935 /* PMP attached? */ 936 if (!sata_pmp_attached(ap)) { 937 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 938 ops->hardreset, ops->postreset, NULL); 939 if (rc) { 940 ata_for_each_dev(dev, &ap->link, ALL) 941 ata_dev_disable(dev); 942 return rc; 943 } 944 945 if (pmp_dev->class != ATA_DEV_PMP) 946 return 0; 947 948 /* new PMP online */ 949 ata_for_each_link(link, ap, EDGE) 950 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 951 952 /* fall through */ 953 } 954 955 /* recover pmp */ 956 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 957 ops->hardreset, ops->postreset); 958 if (rc) 959 goto pmp_fail; 960 961 /* PHY event notification can disturb reset and other recovery 962 * operations. Turn it off. 963 */ 964 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 965 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 966 967 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 968 gscr[SATA_PMP_GSCR_FEAT_EN]); 969 if (err_mask) { 970 ata_link_warn(pmp_link, 971 "failed to disable NOTIFY (err_mask=0x%x)\n", 972 err_mask); 973 goto pmp_fail; 974 } 975 } 976 977 /* handle disabled links */ 978 rc = sata_pmp_eh_handle_disabled_links(ap); 979 if (rc) 980 goto pmp_fail; 981 982 /* recover links */ 983 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 984 ops->pmp_hardreset, ops->pmp_postreset, &link); 985 if (rc) 986 goto link_fail; 987 988 /* clear SNotification */ 989 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 990 if (rc == 0) 991 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 992 993 /* 994 * If LPM is active on any fan-out port, hotplug wouldn't 995 * work. Return w/ PHY event notification disabled. 996 */ 997 ata_for_each_link(link, ap, EDGE) 998 if (link->lpm_policy > ATA_LPM_MAX_POWER) 999 return 0; 1000 1001 /* 1002 * Connection status might have changed while resetting other 1003 * links, enable notification and check SATA_PMP_GSCR_ERROR 1004 * before returning. 1005 */ 1006 1007 /* enable notification */ 1008 if (pmp_dev->flags & ATA_DFLAG_AN) { 1009 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1010 1011 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 1012 gscr[SATA_PMP_GSCR_FEAT_EN]); 1013 if (err_mask) { 1014 ata_dev_err(pmp_dev, 1015 "failed to write PMP_FEAT_EN (Emask=0x%x)\n", 1016 err_mask); 1017 rc = -EIO; 1018 goto pmp_fail; 1019 } 1020 } 1021 1022 /* check GSCR_ERROR */ 1023 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1024 if (err_mask) { 1025 ata_dev_err(pmp_dev, 1026 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n", 1027 err_mask); 1028 rc = -EIO; 1029 goto pmp_fail; 1030 } 1031 1032 cnt = 0; 1033 ata_for_each_link(link, ap, EDGE) { 1034 if (!(gscr_error & (1 << link->pmp))) 1035 continue; 1036 1037 if (sata_pmp_handle_link_fail(link, link_tries)) { 1038 ata_ehi_hotplugged(&link->eh_context.i); 1039 cnt++; 1040 } else { 1041 ata_link_warn(link, 1042 "PHY status changed but maxed out on retries, giving up\n"); 1043 ata_link_warn(link, 1044 "Manually issue scan to resume this link\n"); 1045 } 1046 } 1047 1048 if (cnt) { 1049 ata_port_info(ap, 1050 "PMP SError.N set for some ports, repeating recovery\n"); 1051 goto retry; 1052 } 1053 1054 return 0; 1055 1056 link_fail: 1057 if (sata_pmp_handle_link_fail(link, link_tries)) { 1058 pmp_ehc->i.action |= ATA_EH_RESET; 1059 goto retry; 1060 } 1061 1062 /* fall through */ 1063 pmp_fail: 1064 /* Control always ends up here after detaching PMP. Shut up 1065 * and return if we're unloading. 1066 */ 1067 if (ap->pflags & ATA_PFLAG_UNLOADING) 1068 return rc; 1069 1070 if (!sata_pmp_attached(ap)) 1071 goto retry; 1072 1073 if (--pmp_tries) { 1074 pmp_ehc->i.action |= ATA_EH_RESET; 1075 goto retry; 1076 } 1077 1078 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n", 1079 ATA_EH_PMP_TRIES); 1080 sata_pmp_detach(pmp_dev); 1081 ata_dev_disable(pmp_dev); 1082 1083 return rc; 1084} 1085 1086/** 1087 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1088 * @ap: host port to handle error for 1089 * 1090 * Perform standard error handling sequence for PMP-enabled host 1091 * @ap. 1092 * 1093 * LOCKING: 1094 * Kernel thread context (may sleep). 1095 */ 1096void sata_pmp_error_handler(struct ata_port *ap) 1097{ 1098 ata_eh_autopsy(ap); 1099 ata_eh_report(ap); 1100 sata_pmp_eh_recover(ap); 1101 ata_eh_finish(ap); 1102} 1103 1104EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1105EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1106EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1107