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