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, 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 } 336 337 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) { 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 and SRST 393 * times out under certain configurations. 394 */ 395 if (link->pmp < 5) 396 link->flags |= ATA_LFLAG_NO_SRST | 397 ATA_LFLAG_ASSUME_ATA; 398 399 /* port 5 is for SEMB device and it doesn't like SRST */ 400 if (link->pmp == 5) 401 link->flags |= ATA_LFLAG_NO_SRST | 402 ATA_LFLAG_ASSUME_SEMB; 403 } 404 } else if (vendor == 0x1095 && devid == 0x4723) { 405 /* sil4723 quirks */ 406 ata_for_each_link(link, ap, EDGE) { 407 /* link reports offline after LPM */ 408 link->flags |= ATA_LFLAG_NO_LPM; 409 410 /* class code report is unreliable */ 411 if (link->pmp < 2) 412 link->flags |= ATA_LFLAG_ASSUME_ATA; 413 414 /* the config device at port 2 locks up on SRST */ 415 if (link->pmp == 2) 416 link->flags |= ATA_LFLAG_NO_SRST | 417 ATA_LFLAG_ASSUME_ATA; 418 } 419 } else if (vendor == 0x1095 && devid == 0x4726) { 420 /* sil4726 quirks */ 421 ata_for_each_link(link, ap, EDGE) { 422 /* link reports offline after LPM */ 423 link->flags |= ATA_LFLAG_NO_LPM; 424 425 /* Class code report is unreliable and SRST 426 * times out under certain configurations. 427 * Config device can be at port 0 or 5 and 428 * locks up on SRST. 429 */ 430 if (link->pmp <= 5) 431 link->flags |= ATA_LFLAG_NO_SRST | 432 ATA_LFLAG_ASSUME_ATA; 433 434 /* Port 6 is for SEMB device which doesn't 435 * like SRST either. 436 */ 437 if (link->pmp == 6) 438 link->flags |= ATA_LFLAG_NO_SRST | 439 ATA_LFLAG_ASSUME_SEMB; 440 } 441 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 442 devid == 0x5734 || devid == 0x5744)) { 443 /* sil5723/5744 quirks */ 444 445 /* sil5723/5744 has either two or three downstream 446 * ports depending on operation mode. The last port 447 * is empty if any actual IO device is available or 448 * occupied by a pseudo configuration device 449 * otherwise. Don't try hard to recover it. 450 */ 451 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 452 } else if (vendor == 0x197b && devid == 0x2352) { 453 /* chip found in Thermaltake BlackX Duet, jmicron JMB350? */ 454 ata_for_each_link(link, ap, EDGE) { 455 /* SRST breaks detection and disks get misclassified 456 * LPM disabled to avoid potential problems 457 */ 458 link->flags |= ATA_LFLAG_NO_LPM | 459 ATA_LFLAG_NO_SRST | 460 ATA_LFLAG_ASSUME_ATA; 461 } 462 } 463 } 464 465 /** 466 * sata_pmp_attach - attach a SATA PMP device 467 * @dev: SATA PMP device to attach 468 * 469 * Configure and attach SATA PMP device @dev. This function is 470 * also responsible for allocating and initializing PMP links. 471 * 472 * LOCKING: 473 * Kernel thread context (may sleep). 474 * 475 * RETURNS: 476 * 0 on success, -errno on failure. 477 */ 478 int sata_pmp_attach(struct ata_device *dev) 479 { 480 struct ata_link *link = dev->link; 481 struct ata_port *ap = link->ap; 482 unsigned long flags; 483 struct ata_link *tlink; 484 int rc; 485 486 /* is it hanging off the right place? */ 487 if (!sata_pmp_supported(ap)) { 488 ata_dev_err(dev, "host does not support Port Multiplier\n"); 489 return -EINVAL; 490 } 491 492 if (!ata_is_host_link(link)) { 493 ata_dev_err(dev, "Port Multipliers cannot be nested\n"); 494 return -EINVAL; 495 } 496 497 if (dev->devno) { 498 ata_dev_err(dev, "Port Multiplier must be the first device\n"); 499 return -EINVAL; 500 } 501 502 WARN_ON(link->pmp != 0); 503 link->pmp = SATA_PMP_CTRL_PORT; 504 505 /* read GSCR block */ 506 rc = sata_pmp_read_gscr(dev, dev->gscr); 507 if (rc) 508 goto fail; 509 510 /* config PMP */ 511 rc = sata_pmp_configure(dev, 1); 512 if (rc) 513 goto fail; 514 515 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 516 if (rc) { 517 ata_dev_info(dev, "failed to initialize PMP links\n"); 518 goto fail; 519 } 520 521 /* attach it */ 522 spin_lock_irqsave(ap->lock, flags); 523 WARN_ON(ap->nr_pmp_links); 524 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 525 spin_unlock_irqrestore(ap->lock, flags); 526 527 sata_pmp_quirks(ap); 528 529 if (ap->ops->pmp_attach) 530 ap->ops->pmp_attach(ap); 531 532 ata_for_each_link(tlink, ap, EDGE) 533 sata_link_init_spd(tlink); 534 535 ata_acpi_associate_sata_port(ap); 536 537 return 0; 538 539 fail: 540 link->pmp = 0; 541 return rc; 542 } 543 544 /** 545 * sata_pmp_detach - detach a SATA PMP device 546 * @dev: SATA PMP device to detach 547 * 548 * Detach SATA PMP device @dev. This function is also 549 * responsible for deconfiguring PMP links. 550 * 551 * LOCKING: 552 * Kernel thread context (may sleep). 553 */ 554 static void sata_pmp_detach(struct ata_device *dev) 555 { 556 struct ata_link *link = dev->link; 557 struct ata_port *ap = link->ap; 558 struct ata_link *tlink; 559 unsigned long flags; 560 561 ata_dev_info(dev, "Port Multiplier detaching\n"); 562 563 WARN_ON(!ata_is_host_link(link) || dev->devno || 564 link->pmp != SATA_PMP_CTRL_PORT); 565 566 if (ap->ops->pmp_detach) 567 ap->ops->pmp_detach(ap); 568 569 ata_for_each_link(tlink, ap, EDGE) 570 ata_eh_detach_dev(tlink->device); 571 572 spin_lock_irqsave(ap->lock, flags); 573 ap->nr_pmp_links = 0; 574 link->pmp = 0; 575 spin_unlock_irqrestore(ap->lock, flags); 576 577 ata_acpi_associate_sata_port(ap); 578 } 579 580 /** 581 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 582 * @dev: PMP device to compare against 583 * @new_gscr: GSCR block of the new device 584 * 585 * Compare @new_gscr against @dev and determine whether @dev is 586 * the PMP described by @new_gscr. 587 * 588 * LOCKING: 589 * None. 590 * 591 * RETURNS: 592 * 1 if @dev matches @new_gscr, 0 otherwise. 593 */ 594 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 595 { 596 const u32 *old_gscr = dev->gscr; 597 u16 old_vendor, new_vendor, old_devid, new_devid; 598 int old_nr_ports, new_nr_ports; 599 600 old_vendor = sata_pmp_gscr_vendor(old_gscr); 601 new_vendor = sata_pmp_gscr_vendor(new_gscr); 602 old_devid = sata_pmp_gscr_devid(old_gscr); 603 new_devid = sata_pmp_gscr_devid(new_gscr); 604 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 605 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 606 607 if (old_vendor != new_vendor) { 608 ata_dev_info(dev, 609 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n", 610 old_vendor, new_vendor); 611 return 0; 612 } 613 614 if (old_devid != new_devid) { 615 ata_dev_info(dev, 616 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n", 617 old_devid, new_devid); 618 return 0; 619 } 620 621 if (old_nr_ports != new_nr_ports) { 622 ata_dev_info(dev, 623 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n", 624 old_nr_ports, new_nr_ports); 625 return 0; 626 } 627 628 return 1; 629 } 630 631 /** 632 * sata_pmp_revalidate - revalidate SATA PMP 633 * @dev: PMP device to revalidate 634 * @new_class: new class code 635 * 636 * Re-read GSCR block and make sure @dev is still attached to the 637 * port and properly configured. 638 * 639 * LOCKING: 640 * Kernel thread context (may sleep). 641 * 642 * RETURNS: 643 * 0 on success, -errno otherwise. 644 */ 645 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 646 { 647 struct ata_link *link = dev->link; 648 struct ata_port *ap = link->ap; 649 u32 *gscr = (void *)ap->sector_buf; 650 int rc; 651 652 DPRINTK("ENTER\n"); 653 654 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 655 656 if (!ata_dev_enabled(dev)) { 657 rc = -ENODEV; 658 goto fail; 659 } 660 661 /* wrong class? */ 662 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 663 rc = -ENODEV; 664 goto fail; 665 } 666 667 /* read GSCR */ 668 rc = sata_pmp_read_gscr(dev, gscr); 669 if (rc) 670 goto fail; 671 672 /* is the pmp still there? */ 673 if (!sata_pmp_same_pmp(dev, gscr)) { 674 rc = -ENODEV; 675 goto fail; 676 } 677 678 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 679 680 rc = sata_pmp_configure(dev, 0); 681 if (rc) 682 goto fail; 683 684 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 685 686 DPRINTK("EXIT, rc=0\n"); 687 return 0; 688 689 fail: 690 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc); 691 DPRINTK("EXIT, rc=%d\n", rc); 692 return rc; 693 } 694 695 /** 696 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 697 * @dev: PMP device to revalidate 698 * 699 * Make sure the attached PMP is accessible. 700 * 701 * LOCKING: 702 * Kernel thread context (may sleep). 703 * 704 * RETURNS: 705 * 0 on success, -errno otherwise. 706 */ 707 static int sata_pmp_revalidate_quick(struct ata_device *dev) 708 { 709 unsigned int err_mask; 710 u32 prod_id; 711 712 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 713 if (err_mask) { 714 ata_dev_err(dev, 715 "failed to read PMP product ID (Emask=0x%x)\n", 716 err_mask); 717 return -EIO; 718 } 719 720 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 721 ata_dev_err(dev, "PMP product ID mismatch\n"); 722 /* something weird is going on, request full PMP recovery */ 723 return -EIO; 724 } 725 726 return 0; 727 } 728 729 /** 730 * sata_pmp_eh_recover_pmp - recover PMP 731 * @ap: ATA port PMP is attached to 732 * @prereset: prereset method (can be NULL) 733 * @softreset: softreset method 734 * @hardreset: hardreset method 735 * @postreset: postreset method (can be NULL) 736 * 737 * Recover PMP attached to @ap. Recovery procedure is somewhat 738 * similar to that of ata_eh_recover() except that reset should 739 * always be performed in hard->soft sequence and recovery 740 * failure results in PMP detachment. 741 * 742 * LOCKING: 743 * Kernel thread context (may sleep). 744 * 745 * RETURNS: 746 * 0 on success, -errno on failure. 747 */ 748 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 749 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 750 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 751 { 752 struct ata_link *link = &ap->link; 753 struct ata_eh_context *ehc = &link->eh_context; 754 struct ata_device *dev = link->device; 755 int tries = ATA_EH_PMP_TRIES; 756 int detach = 0, rc = 0; 757 int reval_failed = 0; 758 759 DPRINTK("ENTER\n"); 760 761 if (dev->flags & ATA_DFLAG_DETACH) { 762 detach = 1; 763 goto fail; 764 } 765 766 retry: 767 ehc->classes[0] = ATA_DEV_UNKNOWN; 768 769 if (ehc->i.action & ATA_EH_RESET) { 770 struct ata_link *tlink; 771 772 /* reset */ 773 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 774 postreset); 775 if (rc) { 776 ata_link_err(link, "failed to reset PMP, giving up\n"); 777 goto fail; 778 } 779 780 /* PMP is reset, SErrors cannot be trusted, scan all */ 781 ata_for_each_link(tlink, ap, EDGE) { 782 struct ata_eh_context *ehc = &tlink->eh_context; 783 784 ehc->i.probe_mask |= ATA_ALL_DEVICES; 785 ehc->i.action |= ATA_EH_RESET; 786 } 787 } 788 789 /* If revalidation is requested, revalidate and reconfigure; 790 * otherwise, do quick revalidation. 791 */ 792 if (ehc->i.action & ATA_EH_REVALIDATE) 793 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 794 else 795 rc = sata_pmp_revalidate_quick(dev); 796 797 if (rc) { 798 tries--; 799 800 if (rc == -ENODEV) { 801 ehc->i.probe_mask |= ATA_ALL_DEVICES; 802 detach = 1; 803 /* give it just two more chances */ 804 tries = min(tries, 2); 805 } 806 807 if (tries) { 808 /* consecutive revalidation failures? speed down */ 809 if (reval_failed) 810 sata_down_spd_limit(link, 0); 811 else 812 reval_failed = 1; 813 814 ehc->i.action |= ATA_EH_RESET; 815 goto retry; 816 } else { 817 ata_dev_err(dev, 818 "failed to recover PMP after %d tries, giving up\n", 819 ATA_EH_PMP_TRIES); 820 goto fail; 821 } 822 } 823 824 /* okay, PMP resurrected */ 825 ehc->i.flags = 0; 826 827 DPRINTK("EXIT, rc=0\n"); 828 return 0; 829 830 fail: 831 sata_pmp_detach(dev); 832 if (detach) 833 ata_eh_detach_dev(dev); 834 else 835 ata_dev_disable(dev); 836 837 DPRINTK("EXIT, rc=%d\n", rc); 838 return rc; 839 } 840 841 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 842 { 843 struct ata_link *link; 844 unsigned long flags; 845 int rc; 846 847 spin_lock_irqsave(ap->lock, flags); 848 849 ata_for_each_link(link, ap, EDGE) { 850 if (!(link->flags & ATA_LFLAG_DISABLED)) 851 continue; 852 853 spin_unlock_irqrestore(ap->lock, flags); 854 855 /* Some PMPs require hardreset sequence to get 856 * SError.N working. 857 */ 858 sata_link_hardreset(link, sata_deb_timing_normal, 859 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 860 NULL, NULL); 861 862 /* unconditionally clear SError.N */ 863 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 864 if (rc) { 865 ata_link_err(link, 866 "failed to clear SError.N (errno=%d)\n", 867 rc); 868 return rc; 869 } 870 871 spin_lock_irqsave(ap->lock, flags); 872 } 873 874 spin_unlock_irqrestore(ap->lock, flags); 875 876 return 0; 877 } 878 879 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 880 { 881 struct ata_port *ap = link->ap; 882 unsigned long flags; 883 884 if (link_tries[link->pmp] && --link_tries[link->pmp]) 885 return 1; 886 887 /* disable this link */ 888 if (!(link->flags & ATA_LFLAG_DISABLED)) { 889 ata_link_warn(link, 890 "failed to recover link after %d tries, disabling\n", 891 ATA_EH_PMP_LINK_TRIES); 892 893 spin_lock_irqsave(ap->lock, flags); 894 link->flags |= ATA_LFLAG_DISABLED; 895 spin_unlock_irqrestore(ap->lock, flags); 896 } 897 898 ata_dev_disable(link->device); 899 link->eh_context.i.action = 0; 900 901 return 0; 902 } 903 904 /** 905 * sata_pmp_eh_recover - recover PMP-enabled port 906 * @ap: ATA port to recover 907 * 908 * Drive EH recovery operation for PMP enabled port @ap. This 909 * function recovers host and PMP ports with proper retrials and 910 * fallbacks. Actual recovery operations are performed using 911 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 912 * 913 * LOCKING: 914 * Kernel thread context (may sleep). 915 * 916 * RETURNS: 917 * 0 on success, -errno on failure. 918 */ 919 static int sata_pmp_eh_recover(struct ata_port *ap) 920 { 921 struct ata_port_operations *ops = ap->ops; 922 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 923 struct ata_link *pmp_link = &ap->link; 924 struct ata_device *pmp_dev = pmp_link->device; 925 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 926 u32 *gscr = pmp_dev->gscr; 927 struct ata_link *link; 928 struct ata_device *dev; 929 unsigned int err_mask; 930 u32 gscr_error, sntf; 931 int cnt, rc; 932 933 pmp_tries = ATA_EH_PMP_TRIES; 934 ata_for_each_link(link, ap, EDGE) 935 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 936 937 retry: 938 /* PMP attached? */ 939 if (!sata_pmp_attached(ap)) { 940 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 941 ops->hardreset, ops->postreset, NULL); 942 if (rc) { 943 ata_for_each_dev(dev, &ap->link, ALL) 944 ata_dev_disable(dev); 945 return rc; 946 } 947 948 if (pmp_dev->class != ATA_DEV_PMP) 949 return 0; 950 951 /* new PMP online */ 952 ata_for_each_link(link, ap, EDGE) 953 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 954 955 /* fall through */ 956 } 957 958 /* recover pmp */ 959 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 960 ops->hardreset, ops->postreset); 961 if (rc) 962 goto pmp_fail; 963 964 /* PHY event notification can disturb reset and other recovery 965 * operations. Turn it off. 966 */ 967 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 968 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 969 970 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 971 gscr[SATA_PMP_GSCR_FEAT_EN]); 972 if (err_mask) { 973 ata_link_warn(pmp_link, 974 "failed to disable NOTIFY (err_mask=0x%x)\n", 975 err_mask); 976 goto pmp_fail; 977 } 978 } 979 980 /* handle disabled links */ 981 rc = sata_pmp_eh_handle_disabled_links(ap); 982 if (rc) 983 goto pmp_fail; 984 985 /* recover links */ 986 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 987 ops->pmp_hardreset, ops->pmp_postreset, &link); 988 if (rc) 989 goto link_fail; 990 991 /* clear SNotification */ 992 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 993 if (rc == 0) 994 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 995 996 /* 997 * If LPM is active on any fan-out port, hotplug wouldn't 998 * work. Return w/ PHY event notification disabled. 999 */ 1000 ata_for_each_link(link, ap, EDGE) 1001 if (link->lpm_policy > ATA_LPM_MAX_POWER) 1002 return 0; 1003 1004 /* 1005 * Connection status might have changed while resetting other 1006 * links, enable notification and check SATA_PMP_GSCR_ERROR 1007 * before returning. 1008 */ 1009 1010 /* enable notification */ 1011 if (pmp_dev->flags & ATA_DFLAG_AN) { 1012 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1013 1014 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 1015 gscr[SATA_PMP_GSCR_FEAT_EN]); 1016 if (err_mask) { 1017 ata_dev_err(pmp_dev, 1018 "failed to write PMP_FEAT_EN (Emask=0x%x)\n", 1019 err_mask); 1020 rc = -EIO; 1021 goto pmp_fail; 1022 } 1023 } 1024 1025 /* check GSCR_ERROR */ 1026 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1027 if (err_mask) { 1028 ata_dev_err(pmp_dev, 1029 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n", 1030 err_mask); 1031 rc = -EIO; 1032 goto pmp_fail; 1033 } 1034 1035 cnt = 0; 1036 ata_for_each_link(link, ap, EDGE) { 1037 if (!(gscr_error & (1 << link->pmp))) 1038 continue; 1039 1040 if (sata_pmp_handle_link_fail(link, link_tries)) { 1041 ata_ehi_hotplugged(&link->eh_context.i); 1042 cnt++; 1043 } else { 1044 ata_link_warn(link, 1045 "PHY status changed but maxed out on retries, giving up\n"); 1046 ata_link_warn(link, 1047 "Manually issue scan to resume this link\n"); 1048 } 1049 } 1050 1051 if (cnt) { 1052 ata_port_info(ap, 1053 "PMP SError.N set for some ports, repeating recovery\n"); 1054 goto retry; 1055 } 1056 1057 return 0; 1058 1059 link_fail: 1060 if (sata_pmp_handle_link_fail(link, link_tries)) { 1061 pmp_ehc->i.action |= ATA_EH_RESET; 1062 goto retry; 1063 } 1064 1065 /* fall through */ 1066 pmp_fail: 1067 /* Control always ends up here after detaching PMP. Shut up 1068 * and return if we're unloading. 1069 */ 1070 if (ap->pflags & ATA_PFLAG_UNLOADING) 1071 return rc; 1072 1073 if (!sata_pmp_attached(ap)) 1074 goto retry; 1075 1076 if (--pmp_tries) { 1077 pmp_ehc->i.action |= ATA_EH_RESET; 1078 goto retry; 1079 } 1080 1081 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n", 1082 ATA_EH_PMP_TRIES); 1083 sata_pmp_detach(pmp_dev); 1084 ata_dev_disable(pmp_dev); 1085 1086 return rc; 1087 } 1088 1089 /** 1090 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1091 * @ap: host port to handle error for 1092 * 1093 * Perform standard error handling sequence for PMP-enabled host 1094 * @ap. 1095 * 1096 * LOCKING: 1097 * Kernel thread context (may sleep). 1098 */ 1099 void sata_pmp_error_handler(struct ata_port *ap) 1100 { 1101 ata_eh_autopsy(ap); 1102 ata_eh_report(ap); 1103 sata_pmp_eh_recover(ap); 1104 ata_eh_finish(ap); 1105 } 1106 1107 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1108 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1109 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1110