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/libata.h> 12 #include <linux/slab.h> 13 #include "libata.h" 14 #include "libata-transport.h" 15 16 const struct ata_port_operations sata_pmp_port_ops = { 17 .inherits = &sata_port_ops, 18 .pmp_prereset = ata_std_prereset, 19 .pmp_hardreset = sata_std_hardreset, 20 .pmp_postreset = ata_std_postreset, 21 .error_handler = sata_pmp_error_handler, 22 }; 23 24 /** 25 * sata_pmp_read - read PMP register 26 * @link: link to read PMP register for 27 * @reg: register to read 28 * @r_val: resulting value 29 * 30 * Read PMP register. 31 * 32 * LOCKING: 33 * Kernel thread context (may sleep). 34 * 35 * RETURNS: 36 * 0 on success, AC_ERR_* mask on failure. 37 */ 38 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 39 { 40 struct ata_port *ap = link->ap; 41 struct ata_device *pmp_dev = ap->link.device; 42 struct ata_taskfile tf; 43 unsigned int err_mask; 44 45 ata_tf_init(pmp_dev, &tf); 46 tf.command = ATA_CMD_PMP_READ; 47 tf.protocol = ATA_PROT_NODATA; 48 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 49 tf.feature = reg; 50 tf.device = link->pmp; 51 52 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 53 SATA_PMP_RW_TIMEOUT); 54 if (err_mask) 55 return err_mask; 56 57 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 58 return 0; 59 } 60 61 /** 62 * sata_pmp_write - write PMP register 63 * @link: link to write PMP register for 64 * @reg: register to write 65 * @r_val: value to write 66 * 67 * Write PMP register. 68 * 69 * LOCKING: 70 * Kernel thread context (may sleep). 71 * 72 * RETURNS: 73 * 0 on success, AC_ERR_* mask on failure. 74 */ 75 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 76 { 77 struct ata_port *ap = link->ap; 78 struct ata_device *pmp_dev = ap->link.device; 79 struct ata_taskfile tf; 80 81 ata_tf_init(pmp_dev, &tf); 82 tf.command = ATA_CMD_PMP_WRITE; 83 tf.protocol = ATA_PROT_NODATA; 84 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 85 tf.feature = reg; 86 tf.device = link->pmp; 87 tf.nsect = val & 0xff; 88 tf.lbal = (val >> 8) & 0xff; 89 tf.lbam = (val >> 16) & 0xff; 90 tf.lbah = (val >> 24) & 0xff; 91 92 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 93 SATA_PMP_RW_TIMEOUT); 94 } 95 96 /** 97 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 98 * @qc: ATA command in question 99 * 100 * A host which has command switching PMP support cannot issue 101 * commands to multiple links simultaneously. 102 * 103 * LOCKING: 104 * spin_lock_irqsave(host lock) 105 * 106 * RETURNS: 107 * ATA_DEFER_* if deferring is needed, 0 otherwise. 108 */ 109 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 110 { 111 struct ata_link *link = qc->dev->link; 112 struct ata_port *ap = link->ap; 113 114 if (ap->excl_link == NULL || ap->excl_link == link) { 115 if (ap->nr_active_links == 0 || ata_link_active(link)) { 116 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 117 return ata_std_qc_defer(qc); 118 } 119 120 ap->excl_link = link; 121 } 122 123 return ATA_DEFER_PORT; 124 } 125 126 /** 127 * sata_pmp_scr_read - read PSCR 128 * @link: ATA link to read PSCR for 129 * @reg: PSCR to read 130 * @r_val: resulting value 131 * 132 * Read PSCR @reg into @r_val for @link, to be called from 133 * ata_scr_read(). 134 * 135 * LOCKING: 136 * Kernel thread context (may sleep). 137 * 138 * RETURNS: 139 * 0 on success, -errno on failure. 140 */ 141 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 142 { 143 unsigned int err_mask; 144 145 if (reg > SATA_PMP_PSCR_CONTROL) 146 return -EINVAL; 147 148 err_mask = sata_pmp_read(link, reg, r_val); 149 if (err_mask) { 150 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n", 151 reg, err_mask); 152 return -EIO; 153 } 154 return 0; 155 } 156 157 /** 158 * sata_pmp_scr_write - write PSCR 159 * @link: ATA link to write PSCR for 160 * @reg: PSCR to write 161 * @val: value to be written 162 * 163 * Write @val to PSCR @reg for @link, to be called from 164 * ata_scr_write() and ata_scr_write_flush(). 165 * 166 * LOCKING: 167 * Kernel thread context (may sleep). 168 * 169 * RETURNS: 170 * 0 on success, -errno on failure. 171 */ 172 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 173 { 174 unsigned int err_mask; 175 176 if (reg > SATA_PMP_PSCR_CONTROL) 177 return -EINVAL; 178 179 err_mask = sata_pmp_write(link, reg, val); 180 if (err_mask) { 181 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n", 182 reg, err_mask); 183 return -EIO; 184 } 185 return 0; 186 } 187 188 /** 189 * sata_pmp_set_lpm - configure LPM for a PMP link 190 * @link: PMP link to configure LPM for 191 * @policy: target LPM policy 192 * @hints: LPM hints 193 * 194 * Configure LPM for @link. This function will contain any PMP 195 * specific workarounds if necessary. 196 * 197 * LOCKING: 198 * EH context. 199 * 200 * RETURNS: 201 * 0 on success, -errno on failure. 202 */ 203 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, 204 unsigned hints) 205 { 206 return sata_link_scr_lpm(link, policy, true); 207 } 208 209 /** 210 * sata_pmp_read_gscr - read GSCR block of SATA PMP 211 * @dev: PMP device 212 * @gscr: buffer to read GSCR block into 213 * 214 * Read selected PMP GSCRs from the PMP at @dev. This will serve 215 * as configuration and identification info for the PMP. 216 * 217 * LOCKING: 218 * Kernel thread context (may sleep). 219 * 220 * RETURNS: 221 * 0 on success, -errno on failure. 222 */ 223 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 224 { 225 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 226 int i; 227 228 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 229 int reg = gscr_to_read[i]; 230 unsigned int err_mask; 231 232 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 233 if (err_mask) { 234 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n", 235 reg, err_mask); 236 return -EIO; 237 } 238 } 239 240 return 0; 241 } 242 243 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 244 { 245 u32 rev = gscr[SATA_PMP_GSCR_REV]; 246 247 if (rev & (1 << 3)) 248 return "1.2"; 249 if (rev & (1 << 2)) 250 return "1.1"; 251 if (rev & (1 << 1)) 252 return "1.0"; 253 return "<unknown>"; 254 } 255 256 #define PMP_GSCR_SII_POL 129 257 258 static int sata_pmp_configure(struct ata_device *dev, int print_info) 259 { 260 struct ata_port *ap = dev->link->ap; 261 u32 *gscr = dev->gscr; 262 u16 vendor = sata_pmp_gscr_vendor(gscr); 263 u16 devid = sata_pmp_gscr_devid(gscr); 264 unsigned int err_mask = 0; 265 const char *reason; 266 int nr_ports, rc; 267 268 nr_ports = sata_pmp_gscr_ports(gscr); 269 270 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 271 rc = -EINVAL; 272 reason = "invalid nr_ports"; 273 goto fail; 274 } 275 276 if ((ap->flags & ATA_FLAG_AN) && 277 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 278 dev->flags |= ATA_DFLAG_AN; 279 280 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 281 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 282 SERR_PHYRDY_CHG); 283 if (err_mask) { 284 rc = -EIO; 285 reason = "failed to write GSCR_ERROR_EN"; 286 goto fail; 287 } 288 289 /* Disable sending Early R_OK. 290 * With "cached read" HDD testing and multiple ports busy on a SATA 291 * host controller, 3726 PMP will very rarely drop a deferred 292 * R_OK that was intended for the host. Symptom will be all 293 * 5 drives under test will timeout, get reset, and recover. 294 */ 295 if (vendor == 0x1095 && devid == 0x3726) { 296 u32 reg; 297 298 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); 299 if (err_mask) { 300 rc = -EIO; 301 reason = "failed to read Sil3726 Private Register"; 302 goto fail; 303 } 304 reg &= ~0x1; 305 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); 306 if (err_mask) { 307 rc = -EIO; 308 reason = "failed to write Sil3726 Private Register"; 309 goto fail; 310 } 311 } 312 313 if (print_info) { 314 ata_dev_info(dev, "Port Multiplier %s, " 315 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 316 sata_pmp_spec_rev_str(gscr), vendor, devid, 317 sata_pmp_gscr_rev(gscr), 318 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 319 gscr[SATA_PMP_GSCR_FEAT]); 320 321 if (!(dev->flags & ATA_DFLAG_AN)) 322 ata_dev_info(dev, 323 "Asynchronous notification not supported, " 324 "hotplug won't work on fan-out ports. Use warm-plug instead.\n"); 325 } 326 327 return 0; 328 329 fail: 330 ata_dev_err(dev, 331 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 332 reason, err_mask); 333 return rc; 334 } 335 336 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports) 337 { 338 struct ata_link *pmp_link = ap->pmp_link; 339 int i, err; 340 341 if (!pmp_link) { 342 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 343 GFP_NOIO); 344 if (!pmp_link) 345 return -ENOMEM; 346 347 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 348 ata_link_init(ap, &pmp_link[i], i); 349 350 ap->pmp_link = pmp_link; 351 352 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) { 353 err = ata_tlink_add(&pmp_link[i]); 354 if (err) { 355 goto err_tlink; 356 } 357 } 358 } 359 360 for (i = 0; i < nr_ports; i++) { 361 struct ata_link *link = &pmp_link[i]; 362 struct ata_eh_context *ehc = &link->eh_context; 363 364 link->flags = 0; 365 ehc->i.probe_mask |= ATA_ALL_DEVICES; 366 ehc->i.action |= ATA_EH_RESET; 367 } 368 369 return 0; 370 err_tlink: 371 while (--i >= 0) 372 ata_tlink_delete(&pmp_link[i]); 373 kfree(pmp_link); 374 ap->pmp_link = NULL; 375 return err; 376 } 377 378 static void sata_pmp_quirks(struct ata_port *ap) 379 { 380 u32 *gscr = ap->link.device->gscr; 381 u16 vendor = sata_pmp_gscr_vendor(gscr); 382 u16 devid = sata_pmp_gscr_devid(gscr); 383 struct ata_link *link; 384 385 if (vendor == 0x1095 && devid == 0x3726) { 386 /* sil3726 quirks */ 387 ata_for_each_link(link, ap, EDGE) { 388 /* link reports offline after LPM */ 389 link->flags |= ATA_LFLAG_NO_LPM; 390 391 /* Class code report is unreliable and SRST 392 * times out under certain configurations. 393 */ 394 if (link->pmp < 5) 395 link->flags |= ATA_LFLAG_NO_SRST | 396 ATA_LFLAG_ASSUME_ATA; 397 398 /* port 5 is for SEMB device and it doesn't like SRST */ 399 if (link->pmp == 5) 400 link->flags |= ATA_LFLAG_NO_SRST | 401 ATA_LFLAG_ASSUME_SEMB; 402 } 403 } else if (vendor == 0x1095 && devid == 0x4723) { 404 /* sil4723 quirks */ 405 ata_for_each_link(link, ap, EDGE) { 406 /* link reports offline after LPM */ 407 link->flags |= ATA_LFLAG_NO_LPM; 408 409 /* class code report is unreliable */ 410 if (link->pmp < 2) 411 link->flags |= ATA_LFLAG_ASSUME_ATA; 412 413 /* the config device at port 2 locks up on SRST */ 414 if (link->pmp == 2) 415 link->flags |= ATA_LFLAG_NO_SRST | 416 ATA_LFLAG_ASSUME_ATA; 417 } 418 } else if (vendor == 0x1095 && devid == 0x4726) { 419 /* sil4726 quirks */ 420 ata_for_each_link(link, ap, EDGE) { 421 /* link reports offline after LPM */ 422 link->flags |= ATA_LFLAG_NO_LPM; 423 424 /* Class code report is unreliable and SRST 425 * times out under certain configurations. 426 * Config device can be at port 0 or 5 and 427 * locks up on SRST. 428 */ 429 if (link->pmp <= 5) 430 link->flags |= ATA_LFLAG_NO_SRST | 431 ATA_LFLAG_ASSUME_ATA; 432 433 /* Port 6 is for SEMB device which doesn't 434 * like SRST either. 435 */ 436 if (link->pmp == 6) 437 link->flags |= ATA_LFLAG_NO_SRST | 438 ATA_LFLAG_ASSUME_SEMB; 439 } 440 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 441 devid == 0x5734 || devid == 0x5744)) { 442 /* sil5723/5744 quirks */ 443 444 /* sil5723/5744 has either two or three downstream 445 * ports depending on operation mode. The last port 446 * is empty if any actual IO device is available or 447 * occupied by a pseudo configuration device 448 * otherwise. Don't try hard to recover it. 449 */ 450 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 451 } else if (vendor == 0x197b && devid == 0x2352) { 452 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */ 453 ata_for_each_link(link, ap, EDGE) { 454 /* SRST breaks detection and disks get misclassified 455 * LPM disabled to avoid potential problems 456 */ 457 link->flags |= ATA_LFLAG_NO_LPM | 458 ATA_LFLAG_NO_SRST | 459 ATA_LFLAG_ASSUME_ATA; 460 } 461 } 462 } 463 464 /** 465 * sata_pmp_attach - attach a SATA PMP device 466 * @dev: SATA PMP device to attach 467 * 468 * Configure and attach SATA PMP device @dev. This function is 469 * also responsible for allocating and initializing PMP links. 470 * 471 * LOCKING: 472 * Kernel thread context (may sleep). 473 * 474 * RETURNS: 475 * 0 on success, -errno on failure. 476 */ 477 int sata_pmp_attach(struct ata_device *dev) 478 { 479 struct ata_link *link = dev->link; 480 struct ata_port *ap = link->ap; 481 unsigned long flags; 482 struct ata_link *tlink; 483 int rc; 484 485 /* is it hanging off the right place? */ 486 if (!sata_pmp_supported(ap)) { 487 ata_dev_err(dev, "host does not support Port Multiplier\n"); 488 return -EINVAL; 489 } 490 491 if (!ata_is_host_link(link)) { 492 ata_dev_err(dev, "Port Multipliers cannot be nested\n"); 493 return -EINVAL; 494 } 495 496 if (dev->devno) { 497 ata_dev_err(dev, "Port Multiplier must be the first device\n"); 498 return -EINVAL; 499 } 500 501 WARN_ON(link->pmp != 0); 502 link->pmp = SATA_PMP_CTRL_PORT; 503 504 /* read GSCR block */ 505 rc = sata_pmp_read_gscr(dev, dev->gscr); 506 if (rc) 507 goto fail; 508 509 /* config PMP */ 510 rc = sata_pmp_configure(dev, 1); 511 if (rc) 512 goto fail; 513 514 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 515 if (rc) { 516 ata_dev_info(dev, "failed to initialize PMP links\n"); 517 goto fail; 518 } 519 520 /* attach it */ 521 spin_lock_irqsave(ap->lock, flags); 522 WARN_ON(ap->nr_pmp_links); 523 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 524 spin_unlock_irqrestore(ap->lock, flags); 525 526 sata_pmp_quirks(ap); 527 528 if (ap->ops->pmp_attach) 529 ap->ops->pmp_attach(ap); 530 531 ata_for_each_link(tlink, ap, EDGE) 532 sata_link_init_spd(tlink); 533 534 ata_acpi_associate_sata_port(ap); 535 536 return 0; 537 538 fail: 539 link->pmp = 0; 540 return rc; 541 } 542 543 /** 544 * sata_pmp_detach - detach a SATA PMP device 545 * @dev: SATA PMP device to detach 546 * 547 * Detach SATA PMP device @dev. This function is also 548 * responsible for deconfiguring PMP links. 549 * 550 * LOCKING: 551 * Kernel thread context (may sleep). 552 */ 553 static void sata_pmp_detach(struct ata_device *dev) 554 { 555 struct ata_link *link = dev->link; 556 struct ata_port *ap = link->ap; 557 struct ata_link *tlink; 558 unsigned long flags; 559 560 ata_dev_info(dev, "Port Multiplier detaching\n"); 561 562 WARN_ON(!ata_is_host_link(link) || dev->devno || 563 link->pmp != SATA_PMP_CTRL_PORT); 564 565 if (ap->ops->pmp_detach) 566 ap->ops->pmp_detach(ap); 567 568 ata_for_each_link(tlink, ap, EDGE) 569 ata_eh_detach_dev(tlink->device); 570 571 spin_lock_irqsave(ap->lock, flags); 572 ap->nr_pmp_links = 0; 573 link->pmp = 0; 574 spin_unlock_irqrestore(ap->lock, flags); 575 576 ata_acpi_associate_sata_port(ap); 577 } 578 579 /** 580 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 581 * @dev: PMP device to compare against 582 * @new_gscr: GSCR block of the new device 583 * 584 * Compare @new_gscr against @dev and determine whether @dev is 585 * the PMP described by @new_gscr. 586 * 587 * LOCKING: 588 * None. 589 * 590 * RETURNS: 591 * 1 if @dev matches @new_gscr, 0 otherwise. 592 */ 593 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 594 { 595 const u32 *old_gscr = dev->gscr; 596 u16 old_vendor, new_vendor, old_devid, new_devid; 597 int old_nr_ports, new_nr_ports; 598 599 old_vendor = sata_pmp_gscr_vendor(old_gscr); 600 new_vendor = sata_pmp_gscr_vendor(new_gscr); 601 old_devid = sata_pmp_gscr_devid(old_gscr); 602 new_devid = sata_pmp_gscr_devid(new_gscr); 603 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 604 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 605 606 if (old_vendor != new_vendor) { 607 ata_dev_info(dev, 608 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n", 609 old_vendor, new_vendor); 610 return 0; 611 } 612 613 if (old_devid != new_devid) { 614 ata_dev_info(dev, 615 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n", 616 old_devid, new_devid); 617 return 0; 618 } 619 620 if (old_nr_ports != new_nr_ports) { 621 ata_dev_info(dev, 622 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n", 623 old_nr_ports, new_nr_ports); 624 return 0; 625 } 626 627 return 1; 628 } 629 630 /** 631 * sata_pmp_revalidate - revalidate SATA PMP 632 * @dev: PMP device to revalidate 633 * @new_class: new class code 634 * 635 * Re-read GSCR block and make sure @dev is still attached to the 636 * port and properly configured. 637 * 638 * LOCKING: 639 * Kernel thread context (may sleep). 640 * 641 * RETURNS: 642 * 0 on success, -errno otherwise. 643 */ 644 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 645 { 646 struct ata_link *link = dev->link; 647 struct ata_port *ap = link->ap; 648 u32 *gscr = (void *)ap->sector_buf; 649 int rc; 650 651 DPRINTK("ENTER\n"); 652 653 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 654 655 if (!ata_dev_enabled(dev)) { 656 rc = -ENODEV; 657 goto fail; 658 } 659 660 /* wrong class? */ 661 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 662 rc = -ENODEV; 663 goto fail; 664 } 665 666 /* read GSCR */ 667 rc = sata_pmp_read_gscr(dev, gscr); 668 if (rc) 669 goto fail; 670 671 /* is the pmp still there? */ 672 if (!sata_pmp_same_pmp(dev, gscr)) { 673 rc = -ENODEV; 674 goto fail; 675 } 676 677 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 678 679 rc = sata_pmp_configure(dev, 0); 680 if (rc) 681 goto fail; 682 683 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 684 685 DPRINTK("EXIT, rc=0\n"); 686 return 0; 687 688 fail: 689 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc); 690 DPRINTK("EXIT, rc=%d\n", rc); 691 return rc; 692 } 693 694 /** 695 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 696 * @dev: PMP device to revalidate 697 * 698 * Make sure the attached PMP is accessible. 699 * 700 * LOCKING: 701 * Kernel thread context (may sleep). 702 * 703 * RETURNS: 704 * 0 on success, -errno otherwise. 705 */ 706 static int sata_pmp_revalidate_quick(struct ata_device *dev) 707 { 708 unsigned int err_mask; 709 u32 prod_id; 710 711 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 712 if (err_mask) { 713 ata_dev_err(dev, 714 "failed to read PMP product ID (Emask=0x%x)\n", 715 err_mask); 716 return -EIO; 717 } 718 719 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 720 ata_dev_err(dev, "PMP product ID mismatch\n"); 721 /* something weird is going on, request full PMP recovery */ 722 return -EIO; 723 } 724 725 return 0; 726 } 727 728 /** 729 * sata_pmp_eh_recover_pmp - recover PMP 730 * @ap: ATA port PMP is attached to 731 * @prereset: prereset method (can be NULL) 732 * @softreset: softreset method 733 * @hardreset: hardreset method 734 * @postreset: postreset method (can be NULL) 735 * 736 * Recover PMP attached to @ap. Recovery procedure is somewhat 737 * similar to that of ata_eh_recover() except that reset should 738 * always be performed in hard->soft sequence and recovery 739 * failure results in PMP detachment. 740 * 741 * LOCKING: 742 * Kernel thread context (may sleep). 743 * 744 * RETURNS: 745 * 0 on success, -errno on failure. 746 */ 747 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 748 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 749 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 750 { 751 struct ata_link *link = &ap->link; 752 struct ata_eh_context *ehc = &link->eh_context; 753 struct ata_device *dev = link->device; 754 int tries = ATA_EH_PMP_TRIES; 755 int detach = 0, rc = 0; 756 int reval_failed = 0; 757 758 DPRINTK("ENTER\n"); 759 760 if (dev->flags & ATA_DFLAG_DETACH) { 761 detach = 1; 762 goto fail; 763 } 764 765 retry: 766 ehc->classes[0] = ATA_DEV_UNKNOWN; 767 768 if (ehc->i.action & ATA_EH_RESET) { 769 struct ata_link *tlink; 770 771 /* reset */ 772 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 773 postreset); 774 if (rc) { 775 ata_link_err(link, "failed to reset PMP, giving up\n"); 776 goto fail; 777 } 778 779 /* PMP is reset, SErrors cannot be trusted, scan all */ 780 ata_for_each_link(tlink, ap, EDGE) { 781 struct ata_eh_context *ehc = &tlink->eh_context; 782 783 ehc->i.probe_mask |= ATA_ALL_DEVICES; 784 ehc->i.action |= ATA_EH_RESET; 785 } 786 } 787 788 /* If revalidation is requested, revalidate and reconfigure; 789 * otherwise, do quick revalidation. 790 */ 791 if (ehc->i.action & ATA_EH_REVALIDATE) 792 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 793 else 794 rc = sata_pmp_revalidate_quick(dev); 795 796 if (rc) { 797 tries--; 798 799 if (rc == -ENODEV) { 800 ehc->i.probe_mask |= ATA_ALL_DEVICES; 801 detach = 1; 802 /* give it just two more chances */ 803 tries = min(tries, 2); 804 } 805 806 if (tries) { 807 /* consecutive revalidation failures? speed down */ 808 if (reval_failed) 809 sata_down_spd_limit(link, 0); 810 else 811 reval_failed = 1; 812 813 ehc->i.action |= ATA_EH_RESET; 814 goto retry; 815 } else { 816 ata_dev_err(dev, 817 "failed to recover PMP after %d tries, giving up\n", 818 ATA_EH_PMP_TRIES); 819 goto fail; 820 } 821 } 822 823 /* okay, PMP resurrected */ 824 ehc->i.flags = 0; 825 826 DPRINTK("EXIT, rc=0\n"); 827 return 0; 828 829 fail: 830 sata_pmp_detach(dev); 831 if (detach) 832 ata_eh_detach_dev(dev); 833 else 834 ata_dev_disable(dev); 835 836 DPRINTK("EXIT, rc=%d\n", rc); 837 return rc; 838 } 839 840 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 841 { 842 struct ata_link *link; 843 unsigned long flags; 844 int rc; 845 846 spin_lock_irqsave(ap->lock, flags); 847 848 ata_for_each_link(link, ap, EDGE) { 849 if (!(link->flags & ATA_LFLAG_DISABLED)) 850 continue; 851 852 spin_unlock_irqrestore(ap->lock, flags); 853 854 /* Some PMPs require hardreset sequence to get 855 * SError.N working. 856 */ 857 sata_link_hardreset(link, sata_deb_timing_normal, 858 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 859 NULL, NULL); 860 861 /* unconditionally clear SError.N */ 862 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 863 if (rc) { 864 ata_link_err(link, 865 "failed to clear SError.N (errno=%d)\n", 866 rc); 867 return rc; 868 } 869 870 spin_lock_irqsave(ap->lock, flags); 871 } 872 873 spin_unlock_irqrestore(ap->lock, flags); 874 875 return 0; 876 } 877 878 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 879 { 880 struct ata_port *ap = link->ap; 881 unsigned long flags; 882 883 if (link_tries[link->pmp] && --link_tries[link->pmp]) 884 return 1; 885 886 /* disable this link */ 887 if (!(link->flags & ATA_LFLAG_DISABLED)) { 888 ata_link_warn(link, 889 "failed to recover link after %d tries, disabling\n", 890 ATA_EH_PMP_LINK_TRIES); 891 892 spin_lock_irqsave(ap->lock, flags); 893 link->flags |= ATA_LFLAG_DISABLED; 894 spin_unlock_irqrestore(ap->lock, flags); 895 } 896 897 ata_dev_disable(link->device); 898 link->eh_context.i.action = 0; 899 900 return 0; 901 } 902 903 /** 904 * sata_pmp_eh_recover - recover PMP-enabled port 905 * @ap: ATA port to recover 906 * 907 * Drive EH recovery operation for PMP enabled port @ap. This 908 * function recovers host and PMP ports with proper retrials and 909 * fallbacks. Actual recovery operations are performed using 910 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 911 * 912 * LOCKING: 913 * Kernel thread context (may sleep). 914 * 915 * RETURNS: 916 * 0 on success, -errno on failure. 917 */ 918 static int sata_pmp_eh_recover(struct ata_port *ap) 919 { 920 struct ata_port_operations *ops = ap->ops; 921 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 922 struct ata_link *pmp_link = &ap->link; 923 struct ata_device *pmp_dev = pmp_link->device; 924 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 925 u32 *gscr = pmp_dev->gscr; 926 struct ata_link *link; 927 struct ata_device *dev; 928 unsigned int err_mask; 929 u32 gscr_error, sntf; 930 int cnt, rc; 931 932 pmp_tries = ATA_EH_PMP_TRIES; 933 ata_for_each_link(link, ap, EDGE) 934 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 935 936 retry: 937 /* PMP attached? */ 938 if (!sata_pmp_attached(ap)) { 939 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 940 ops->hardreset, ops->postreset, NULL); 941 if (rc) { 942 ata_for_each_dev(dev, &ap->link, ALL) 943 ata_dev_disable(dev); 944 return rc; 945 } 946 947 if (pmp_dev->class != ATA_DEV_PMP) 948 return 0; 949 950 /* new PMP online */ 951 ata_for_each_link(link, ap, EDGE) 952 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 953 954 /* fall through */ 955 } 956 957 /* recover pmp */ 958 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 959 ops->hardreset, ops->postreset); 960 if (rc) 961 goto pmp_fail; 962 963 /* PHY event notification can disturb reset and other recovery 964 * operations. Turn it off. 965 */ 966 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 967 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 968 969 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 970 gscr[SATA_PMP_GSCR_FEAT_EN]); 971 if (err_mask) { 972 ata_link_warn(pmp_link, 973 "failed to disable NOTIFY (err_mask=0x%x)\n", 974 err_mask); 975 goto pmp_fail; 976 } 977 } 978 979 /* handle disabled links */ 980 rc = sata_pmp_eh_handle_disabled_links(ap); 981 if (rc) 982 goto pmp_fail; 983 984 /* recover links */ 985 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 986 ops->pmp_hardreset, ops->pmp_postreset, &link); 987 if (rc) 988 goto link_fail; 989 990 /* clear SNotification */ 991 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 992 if (rc == 0) 993 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 994 995 /* 996 * If LPM is active on any fan-out port, hotplug wouldn't 997 * work. Return w/ PHY event notification disabled. 998 */ 999 ata_for_each_link(link, ap, EDGE) 1000 if (link->lpm_policy > ATA_LPM_MAX_POWER) 1001 return 0; 1002 1003 /* 1004 * Connection status might have changed while resetting other 1005 * links, enable notification and check SATA_PMP_GSCR_ERROR 1006 * before returning. 1007 */ 1008 1009 /* enable notification */ 1010 if (pmp_dev->flags & ATA_DFLAG_AN) { 1011 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1012 1013 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 1014 gscr[SATA_PMP_GSCR_FEAT_EN]); 1015 if (err_mask) { 1016 ata_dev_err(pmp_dev, 1017 "failed to write PMP_FEAT_EN (Emask=0x%x)\n", 1018 err_mask); 1019 rc = -EIO; 1020 goto pmp_fail; 1021 } 1022 } 1023 1024 /* check GSCR_ERROR */ 1025 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1026 if (err_mask) { 1027 ata_dev_err(pmp_dev, 1028 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n", 1029 err_mask); 1030 rc = -EIO; 1031 goto pmp_fail; 1032 } 1033 1034 cnt = 0; 1035 ata_for_each_link(link, ap, EDGE) { 1036 if (!(gscr_error & (1 << link->pmp))) 1037 continue; 1038 1039 if (sata_pmp_handle_link_fail(link, link_tries)) { 1040 ata_ehi_hotplugged(&link->eh_context.i); 1041 cnt++; 1042 } else { 1043 ata_link_warn(link, 1044 "PHY status changed but maxed out on retries, giving up\n"); 1045 ata_link_warn(link, 1046 "Manually issue scan to resume this link\n"); 1047 } 1048 } 1049 1050 if (cnt) { 1051 ata_port_info(ap, 1052 "PMP SError.N set for some ports, repeating recovery\n"); 1053 goto retry; 1054 } 1055 1056 return 0; 1057 1058 link_fail: 1059 if (sata_pmp_handle_link_fail(link, link_tries)) { 1060 pmp_ehc->i.action |= ATA_EH_RESET; 1061 goto retry; 1062 } 1063 1064 /* fall through */ 1065 pmp_fail: 1066 /* Control always ends up here after detaching PMP. Shut up 1067 * and return if we're unloading. 1068 */ 1069 if (ap->pflags & ATA_PFLAG_UNLOADING) 1070 return rc; 1071 1072 if (!sata_pmp_attached(ap)) 1073 goto retry; 1074 1075 if (--pmp_tries) { 1076 pmp_ehc->i.action |= ATA_EH_RESET; 1077 goto retry; 1078 } 1079 1080 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n", 1081 ATA_EH_PMP_TRIES); 1082 sata_pmp_detach(pmp_dev); 1083 ata_dev_disable(pmp_dev); 1084 1085 return rc; 1086 } 1087 1088 /** 1089 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1090 * @ap: host port to handle error for 1091 * 1092 * Perform standard error handling sequence for PMP-enabled host 1093 * @ap. 1094 * 1095 * LOCKING: 1096 * Kernel thread context (may sleep). 1097 */ 1098 void sata_pmp_error_handler(struct ata_port *ap) 1099 { 1100 ata_eh_autopsy(ap); 1101 ata_eh_report(ap); 1102 sata_pmp_eh_recover(ap); 1103 ata_eh_finish(ap); 1104 } 1105 1106 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1107 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1108 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1109