1 /* 2 * libata-pmp.c - libata port multiplier support 3 * 4 * Copyright (c) 2007 SUSE Linux Products GmbH 5 * Copyright (c) 2007 Tejun Heo <teheo@suse.de> 6 * 7 * This file is released under the GPLv2. 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/export.h> 12 #include <linux/libata.h> 13 #include <linux/slab.h> 14 #include "libata.h" 15 #include "libata-transport.h" 16 17 const struct ata_port_operations sata_pmp_port_ops = { 18 .inherits = &sata_port_ops, 19 .pmp_prereset = ata_std_prereset, 20 .pmp_hardreset = sata_std_hardreset, 21 .pmp_postreset = ata_std_postreset, 22 .error_handler = sata_pmp_error_handler, 23 }; 24 25 /** 26 * sata_pmp_read - read PMP register 27 * @link: link to read PMP register for 28 * @reg: register to read 29 * @r_val: resulting value 30 * 31 * Read PMP register. 32 * 33 * LOCKING: 34 * Kernel thread context (may sleep). 35 * 36 * RETURNS: 37 * 0 on success, AC_ERR_* mask on failure. 38 */ 39 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 40 { 41 struct ata_port *ap = link->ap; 42 struct ata_device *pmp_dev = ap->link.device; 43 struct ata_taskfile tf; 44 unsigned int err_mask; 45 46 ata_tf_init(pmp_dev, &tf); 47 tf.command = ATA_CMD_PMP_READ; 48 tf.protocol = ATA_PROT_NODATA; 49 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 50 tf.feature = reg; 51 tf.device = link->pmp; 52 53 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 54 SATA_PMP_RW_TIMEOUT); 55 if (err_mask) 56 return err_mask; 57 58 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 59 return 0; 60 } 61 62 /** 63 * sata_pmp_write - write PMP register 64 * @link: link to write PMP register for 65 * @reg: register to write 66 * @r_val: value to write 67 * 68 * Write PMP register. 69 * 70 * LOCKING: 71 * Kernel thread context (may sleep). 72 * 73 * RETURNS: 74 * 0 on success, AC_ERR_* mask on failure. 75 */ 76 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 77 { 78 struct ata_port *ap = link->ap; 79 struct ata_device *pmp_dev = ap->link.device; 80 struct ata_taskfile tf; 81 82 ata_tf_init(pmp_dev, &tf); 83 tf.command = ATA_CMD_PMP_WRITE; 84 tf.protocol = ATA_PROT_NODATA; 85 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 86 tf.feature = reg; 87 tf.device = link->pmp; 88 tf.nsect = val & 0xff; 89 tf.lbal = (val >> 8) & 0xff; 90 tf.lbam = (val >> 16) & 0xff; 91 tf.lbah = (val >> 24) & 0xff; 92 93 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 94 SATA_PMP_RW_TIMEOUT); 95 } 96 97 /** 98 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 99 * @qc: ATA command in question 100 * 101 * A host which has command switching PMP support cannot issue 102 * commands to multiple links simultaneously. 103 * 104 * LOCKING: 105 * spin_lock_irqsave(host lock) 106 * 107 * RETURNS: 108 * ATA_DEFER_* if deferring is needed, 0 otherwise. 109 */ 110 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 111 { 112 struct ata_link *link = qc->dev->link; 113 struct ata_port *ap = link->ap; 114 115 if (ap->excl_link == NULL || ap->excl_link == link) { 116 if (ap->nr_active_links == 0 || ata_link_active(link)) { 117 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 118 return ata_std_qc_defer(qc); 119 } 120 121 ap->excl_link = link; 122 } 123 124 return ATA_DEFER_PORT; 125 } 126 127 /** 128 * sata_pmp_scr_read - read PSCR 129 * @link: ATA link to read PSCR for 130 * @reg: PSCR to read 131 * @r_val: resulting value 132 * 133 * Read PSCR @reg into @r_val for @link, to be called from 134 * ata_scr_read(). 135 * 136 * LOCKING: 137 * Kernel thread context (may sleep). 138 * 139 * RETURNS: 140 * 0 on success, -errno on failure. 141 */ 142 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 143 { 144 unsigned int err_mask; 145 146 if (reg > SATA_PMP_PSCR_CONTROL) 147 return -EINVAL; 148 149 err_mask = sata_pmp_read(link, reg, r_val); 150 if (err_mask) { 151 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n", 152 reg, err_mask); 153 return -EIO; 154 } 155 return 0; 156 } 157 158 /** 159 * sata_pmp_scr_write - write PSCR 160 * @link: ATA link to write PSCR for 161 * @reg: PSCR to write 162 * @val: value to be written 163 * 164 * Write @val to PSCR @reg for @link, to be called from 165 * ata_scr_write() and ata_scr_write_flush(). 166 * 167 * LOCKING: 168 * Kernel thread context (may sleep). 169 * 170 * RETURNS: 171 * 0 on success, -errno on failure. 172 */ 173 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 174 { 175 unsigned int err_mask; 176 177 if (reg > SATA_PMP_PSCR_CONTROL) 178 return -EINVAL; 179 180 err_mask = sata_pmp_write(link, reg, val); 181 if (err_mask) { 182 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n", 183 reg, err_mask); 184 return -EIO; 185 } 186 return 0; 187 } 188 189 /** 190 * sata_pmp_set_lpm - configure LPM for a PMP link 191 * @link: PMP link to configure LPM for 192 * @policy: target LPM policy 193 * @hints: LPM hints 194 * 195 * Configure LPM for @link. This function will contain any PMP 196 * specific workarounds if necessary. 197 * 198 * LOCKING: 199 * EH context. 200 * 201 * RETURNS: 202 * 0 on success, -errno on failure. 203 */ 204 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy, 205 unsigned hints) 206 { 207 return sata_link_scr_lpm(link, policy, true); 208 } 209 210 /** 211 * sata_pmp_read_gscr - read GSCR block of SATA PMP 212 * @dev: PMP device 213 * @gscr: buffer to read GSCR block into 214 * 215 * Read selected PMP GSCRs from the PMP at @dev. This will serve 216 * as configuration and identification info for the PMP. 217 * 218 * LOCKING: 219 * Kernel thread context (may sleep). 220 * 221 * RETURNS: 222 * 0 on success, -errno on failure. 223 */ 224 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 225 { 226 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 227 int i; 228 229 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 230 int reg = gscr_to_read[i]; 231 unsigned int err_mask; 232 233 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 234 if (err_mask) { 235 ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n", 236 reg, err_mask); 237 return -EIO; 238 } 239 } 240 241 return 0; 242 } 243 244 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 245 { 246 u32 rev = gscr[SATA_PMP_GSCR_REV]; 247 248 if (rev & (1 << 3)) 249 return "1.2"; 250 if (rev & (1 << 2)) 251 return "1.1"; 252 if (rev & (1 << 1)) 253 return "1.0"; 254 return "<unknown>"; 255 } 256 257 #define PMP_GSCR_SII_POL 129 258 259 static int sata_pmp_configure(struct ata_device *dev, int print_info) 260 { 261 struct ata_port *ap = dev->link->ap; 262 u32 *gscr = dev->gscr; 263 u16 vendor = sata_pmp_gscr_vendor(gscr); 264 u16 devid = sata_pmp_gscr_devid(gscr); 265 unsigned int err_mask = 0; 266 const char *reason; 267 int nr_ports, rc; 268 269 nr_ports = sata_pmp_gscr_ports(gscr); 270 271 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 272 rc = -EINVAL; 273 reason = "invalid nr_ports"; 274 goto fail; 275 } 276 277 if ((ap->flags & ATA_FLAG_AN) && 278 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 279 dev->flags |= ATA_DFLAG_AN; 280 281 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 282 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 283 SERR_PHYRDY_CHG); 284 if (err_mask) { 285 rc = -EIO; 286 reason = "failed to write GSCR_ERROR_EN"; 287 goto fail; 288 } 289 290 /* Disable sending Early R_OK. 291 * With "cached read" HDD testing and multiple ports busy on a SATA 292 * host controller, 3x26 PMP will very rarely drop a deferred 293 * R_OK that was intended for the host. Symptom will be all 294 * 5 drives under test will timeout, get reset, and recover. 295 */ 296 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) { 297 u32 reg; 298 299 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); 300 if (err_mask) { 301 rc = -EIO; 302 reason = "failed to read Sil3x26 Private Register"; 303 goto fail; 304 } 305 reg &= ~0x1; 306 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); 307 if (err_mask) { 308 rc = -EIO; 309 reason = "failed to write Sil3x26 Private Register"; 310 goto fail; 311 } 312 } 313 314 if (print_info) { 315 ata_dev_info(dev, "Port Multiplier %s, " 316 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 317 sata_pmp_spec_rev_str(gscr), vendor, devid, 318 sata_pmp_gscr_rev(gscr), 319 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 320 gscr[SATA_PMP_GSCR_FEAT]); 321 322 if (!(dev->flags & ATA_DFLAG_AN)) 323 ata_dev_info(dev, 324 "Asynchronous notification not supported, " 325 "hotplug won't work on fan-out ports. Use warm-plug instead.\n"); 326 } 327 328 return 0; 329 330 fail: 331 ata_dev_err(dev, 332 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 333 reason, err_mask); 334 return rc; 335 } 336 337 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports) 338 { 339 struct ata_link *pmp_link = ap->pmp_link; 340 int i, err; 341 342 if (!pmp_link) { 343 pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]), 344 GFP_NOIO); 345 if (!pmp_link) 346 return -ENOMEM; 347 348 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 349 ata_link_init(ap, &pmp_link[i], i); 350 351 ap->pmp_link = pmp_link; 352 353 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) { 354 err = ata_tlink_add(&pmp_link[i]); 355 if (err) { 356 goto err_tlink; 357 } 358 } 359 } 360 361 for (i = 0; i < nr_ports; i++) { 362 struct ata_link *link = &pmp_link[i]; 363 struct ata_eh_context *ehc = &link->eh_context; 364 365 link->flags = 0; 366 ehc->i.probe_mask |= ATA_ALL_DEVICES; 367 ehc->i.action |= ATA_EH_RESET; 368 } 369 370 return 0; 371 err_tlink: 372 while (--i >= 0) 373 ata_tlink_delete(&pmp_link[i]); 374 kfree(pmp_link); 375 ap->pmp_link = NULL; 376 return err; 377 } 378 379 static void sata_pmp_quirks(struct ata_port *ap) 380 { 381 u32 *gscr = ap->link.device->gscr; 382 u16 vendor = sata_pmp_gscr_vendor(gscr); 383 u16 devid = sata_pmp_gscr_devid(gscr); 384 struct ata_link *link; 385 386 if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) { 387 /* sil3x26 quirks */ 388 ata_for_each_link(link, ap, EDGE) { 389 /* link reports offline after LPM */ 390 link->flags |= ATA_LFLAG_NO_LPM; 391 392 /* 393 * Class code report is unreliable and SRST times 394 * out under certain configurations. 395 */ 396 if (link->pmp < 5) 397 link->flags |= ATA_LFLAG_NO_SRST | 398 ATA_LFLAG_ASSUME_ATA; 399 400 /* port 5 is for SEMB device and it doesn't like SRST */ 401 if (link->pmp == 5) 402 link->flags |= ATA_LFLAG_NO_SRST | 403 ATA_LFLAG_ASSUME_SEMB; 404 } 405 } else if (vendor == 0x1095 && devid == 0x4723) { 406 /* 407 * sil4723 quirks 408 * 409 * Link reports offline after LPM. Class code report is 410 * unreliable. SIMG PMPs never got SRST reliable and the 411 * config device at port 2 locks up on SRST. 412 */ 413 ata_for_each_link(link, ap, EDGE) 414 link->flags |= ATA_LFLAG_NO_LPM | 415 ATA_LFLAG_NO_SRST | 416 ATA_LFLAG_ASSUME_ATA; 417 } else if (vendor == 0x1095 && devid == 0x4726) { 418 /* sil4726 quirks */ 419 ata_for_each_link(link, ap, EDGE) { 420 /* link reports offline after LPM */ 421 link->flags |= ATA_LFLAG_NO_LPM; 422 423 /* Class code report is unreliable and SRST 424 * times out under certain configurations. 425 * Config device can be at port 0 or 5 and 426 * locks up on SRST. 427 */ 428 if (link->pmp <= 5) 429 link->flags |= ATA_LFLAG_NO_SRST | 430 ATA_LFLAG_ASSUME_ATA; 431 432 /* Port 6 is for SEMB device which doesn't 433 * like SRST either. 434 */ 435 if (link->pmp == 6) 436 link->flags |= ATA_LFLAG_NO_SRST | 437 ATA_LFLAG_ASSUME_SEMB; 438 } 439 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 440 devid == 0x5734 || devid == 0x5744)) { 441 /* sil5723/5744 quirks */ 442 443 /* sil5723/5744 has either two or three downstream 444 * ports depending on operation mode. The last port 445 * is empty if any actual IO device is available or 446 * occupied by a pseudo configuration device 447 * otherwise. Don't try hard to recover it. 448 */ 449 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 450 } else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) { 451 /* 452 * 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350? 453 * 0x0325: jmicron JMB394. 454 */ 455 ata_for_each_link(link, ap, EDGE) { 456 /* SRST breaks detection and disks get misclassified 457 * LPM disabled to avoid potential problems 458 */ 459 link->flags |= ATA_LFLAG_NO_LPM | 460 ATA_LFLAG_NO_SRST | 461 ATA_LFLAG_ASSUME_ATA; 462 } 463 } else if (vendor == 0x11ab && devid == 0x4140) { 464 /* Marvell 4140 quirks */ 465 ata_for_each_link(link, ap, EDGE) { 466 /* port 4 is for SEMB device and it doesn't like SRST */ 467 if (link->pmp == 4) 468 link->flags |= ATA_LFLAG_DISABLED; 469 } 470 } 471 } 472 473 /** 474 * sata_pmp_attach - attach a SATA PMP device 475 * @dev: SATA PMP device to attach 476 * 477 * Configure and attach SATA PMP device @dev. This function is 478 * also responsible for allocating and initializing PMP links. 479 * 480 * LOCKING: 481 * Kernel thread context (may sleep). 482 * 483 * RETURNS: 484 * 0 on success, -errno on failure. 485 */ 486 int sata_pmp_attach(struct ata_device *dev) 487 { 488 struct ata_link *link = dev->link; 489 struct ata_port *ap = link->ap; 490 unsigned long flags; 491 struct ata_link *tlink; 492 int rc; 493 494 /* is it hanging off the right place? */ 495 if (!sata_pmp_supported(ap)) { 496 ata_dev_err(dev, "host does not support Port Multiplier\n"); 497 return -EINVAL; 498 } 499 500 if (!ata_is_host_link(link)) { 501 ata_dev_err(dev, "Port Multipliers cannot be nested\n"); 502 return -EINVAL; 503 } 504 505 if (dev->devno) { 506 ata_dev_err(dev, "Port Multiplier must be the first device\n"); 507 return -EINVAL; 508 } 509 510 WARN_ON(link->pmp != 0); 511 link->pmp = SATA_PMP_CTRL_PORT; 512 513 /* read GSCR block */ 514 rc = sata_pmp_read_gscr(dev, dev->gscr); 515 if (rc) 516 goto fail; 517 518 /* config PMP */ 519 rc = sata_pmp_configure(dev, 1); 520 if (rc) 521 goto fail; 522 523 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 524 if (rc) { 525 ata_dev_info(dev, "failed to initialize PMP links\n"); 526 goto fail; 527 } 528 529 /* attach it */ 530 spin_lock_irqsave(ap->lock, flags); 531 WARN_ON(ap->nr_pmp_links); 532 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 533 spin_unlock_irqrestore(ap->lock, flags); 534 535 sata_pmp_quirks(ap); 536 537 if (ap->ops->pmp_attach) 538 ap->ops->pmp_attach(ap); 539 540 ata_for_each_link(tlink, ap, EDGE) 541 sata_link_init_spd(tlink); 542 543 return 0; 544 545 fail: 546 link->pmp = 0; 547 return rc; 548 } 549 550 /** 551 * sata_pmp_detach - detach a SATA PMP device 552 * @dev: SATA PMP device to detach 553 * 554 * Detach SATA PMP device @dev. This function is also 555 * responsible for deconfiguring PMP links. 556 * 557 * LOCKING: 558 * Kernel thread context (may sleep). 559 */ 560 static void sata_pmp_detach(struct ata_device *dev) 561 { 562 struct ata_link *link = dev->link; 563 struct ata_port *ap = link->ap; 564 struct ata_link *tlink; 565 unsigned long flags; 566 567 ata_dev_info(dev, "Port Multiplier detaching\n"); 568 569 WARN_ON(!ata_is_host_link(link) || dev->devno || 570 link->pmp != SATA_PMP_CTRL_PORT); 571 572 if (ap->ops->pmp_detach) 573 ap->ops->pmp_detach(ap); 574 575 ata_for_each_link(tlink, ap, EDGE) 576 ata_eh_detach_dev(tlink->device); 577 578 spin_lock_irqsave(ap->lock, flags); 579 ap->nr_pmp_links = 0; 580 link->pmp = 0; 581 spin_unlock_irqrestore(ap->lock, flags); 582 } 583 584 /** 585 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 586 * @dev: PMP device to compare against 587 * @new_gscr: GSCR block of the new device 588 * 589 * Compare @new_gscr against @dev and determine whether @dev is 590 * the PMP described by @new_gscr. 591 * 592 * LOCKING: 593 * None. 594 * 595 * RETURNS: 596 * 1 if @dev matches @new_gscr, 0 otherwise. 597 */ 598 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 599 { 600 const u32 *old_gscr = dev->gscr; 601 u16 old_vendor, new_vendor, old_devid, new_devid; 602 int old_nr_ports, new_nr_ports; 603 604 old_vendor = sata_pmp_gscr_vendor(old_gscr); 605 new_vendor = sata_pmp_gscr_vendor(new_gscr); 606 old_devid = sata_pmp_gscr_devid(old_gscr); 607 new_devid = sata_pmp_gscr_devid(new_gscr); 608 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 609 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 610 611 if (old_vendor != new_vendor) { 612 ata_dev_info(dev, 613 "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n", 614 old_vendor, new_vendor); 615 return 0; 616 } 617 618 if (old_devid != new_devid) { 619 ata_dev_info(dev, 620 "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n", 621 old_devid, new_devid); 622 return 0; 623 } 624 625 if (old_nr_ports != new_nr_ports) { 626 ata_dev_info(dev, 627 "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n", 628 old_nr_ports, new_nr_ports); 629 return 0; 630 } 631 632 return 1; 633 } 634 635 /** 636 * sata_pmp_revalidate - revalidate SATA PMP 637 * @dev: PMP device to revalidate 638 * @new_class: new class code 639 * 640 * Re-read GSCR block and make sure @dev is still attached to the 641 * port and properly configured. 642 * 643 * LOCKING: 644 * Kernel thread context (may sleep). 645 * 646 * RETURNS: 647 * 0 on success, -errno otherwise. 648 */ 649 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 650 { 651 struct ata_link *link = dev->link; 652 struct ata_port *ap = link->ap; 653 u32 *gscr = (void *)ap->sector_buf; 654 int rc; 655 656 DPRINTK("ENTER\n"); 657 658 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 659 660 if (!ata_dev_enabled(dev)) { 661 rc = -ENODEV; 662 goto fail; 663 } 664 665 /* wrong class? */ 666 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 667 rc = -ENODEV; 668 goto fail; 669 } 670 671 /* read GSCR */ 672 rc = sata_pmp_read_gscr(dev, gscr); 673 if (rc) 674 goto fail; 675 676 /* is the pmp still there? */ 677 if (!sata_pmp_same_pmp(dev, gscr)) { 678 rc = -ENODEV; 679 goto fail; 680 } 681 682 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 683 684 rc = sata_pmp_configure(dev, 0); 685 if (rc) 686 goto fail; 687 688 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 689 690 DPRINTK("EXIT, rc=0\n"); 691 return 0; 692 693 fail: 694 ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc); 695 DPRINTK("EXIT, rc=%d\n", rc); 696 return rc; 697 } 698 699 /** 700 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 701 * @dev: PMP device to revalidate 702 * 703 * Make sure the attached PMP is accessible. 704 * 705 * LOCKING: 706 * Kernel thread context (may sleep). 707 * 708 * RETURNS: 709 * 0 on success, -errno otherwise. 710 */ 711 static int sata_pmp_revalidate_quick(struct ata_device *dev) 712 { 713 unsigned int err_mask; 714 u32 prod_id; 715 716 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 717 if (err_mask) { 718 ata_dev_err(dev, 719 "failed to read PMP product ID (Emask=0x%x)\n", 720 err_mask); 721 return -EIO; 722 } 723 724 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 725 ata_dev_err(dev, "PMP product ID mismatch\n"); 726 /* something weird is going on, request full PMP recovery */ 727 return -EIO; 728 } 729 730 return 0; 731 } 732 733 /** 734 * sata_pmp_eh_recover_pmp - recover PMP 735 * @ap: ATA port PMP is attached to 736 * @prereset: prereset method (can be NULL) 737 * @softreset: softreset method 738 * @hardreset: hardreset method 739 * @postreset: postreset method (can be NULL) 740 * 741 * Recover PMP attached to @ap. Recovery procedure is somewhat 742 * similar to that of ata_eh_recover() except that reset should 743 * always be performed in hard->soft sequence and recovery 744 * failure results in PMP detachment. 745 * 746 * LOCKING: 747 * Kernel thread context (may sleep). 748 * 749 * RETURNS: 750 * 0 on success, -errno on failure. 751 */ 752 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 753 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 754 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 755 { 756 struct ata_link *link = &ap->link; 757 struct ata_eh_context *ehc = &link->eh_context; 758 struct ata_device *dev = link->device; 759 int tries = ATA_EH_PMP_TRIES; 760 int detach = 0, rc = 0; 761 int reval_failed = 0; 762 763 DPRINTK("ENTER\n"); 764 765 if (dev->flags & ATA_DFLAG_DETACH) { 766 detach = 1; 767 goto fail; 768 } 769 770 retry: 771 ehc->classes[0] = ATA_DEV_UNKNOWN; 772 773 if (ehc->i.action & ATA_EH_RESET) { 774 struct ata_link *tlink; 775 776 /* reset */ 777 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 778 postreset); 779 if (rc) { 780 ata_link_err(link, "failed to reset PMP, giving up\n"); 781 goto fail; 782 } 783 784 /* PMP is reset, SErrors cannot be trusted, scan all */ 785 ata_for_each_link(tlink, ap, EDGE) { 786 struct ata_eh_context *ehc = &tlink->eh_context; 787 788 ehc->i.probe_mask |= ATA_ALL_DEVICES; 789 ehc->i.action |= ATA_EH_RESET; 790 } 791 } 792 793 /* If revalidation is requested, revalidate and reconfigure; 794 * otherwise, do quick revalidation. 795 */ 796 if (ehc->i.action & ATA_EH_REVALIDATE) 797 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 798 else 799 rc = sata_pmp_revalidate_quick(dev); 800 801 if (rc) { 802 tries--; 803 804 if (rc == -ENODEV) { 805 ehc->i.probe_mask |= ATA_ALL_DEVICES; 806 detach = 1; 807 /* give it just two more chances */ 808 tries = min(tries, 2); 809 } 810 811 if (tries) { 812 /* consecutive revalidation failures? speed down */ 813 if (reval_failed) 814 sata_down_spd_limit(link, 0); 815 else 816 reval_failed = 1; 817 818 ehc->i.action |= ATA_EH_RESET; 819 goto retry; 820 } else { 821 ata_dev_err(dev, 822 "failed to recover PMP after %d tries, giving up\n", 823 ATA_EH_PMP_TRIES); 824 goto fail; 825 } 826 } 827 828 /* okay, PMP resurrected */ 829 ehc->i.flags = 0; 830 831 DPRINTK("EXIT, rc=0\n"); 832 return 0; 833 834 fail: 835 sata_pmp_detach(dev); 836 if (detach) 837 ata_eh_detach_dev(dev); 838 else 839 ata_dev_disable(dev); 840 841 DPRINTK("EXIT, rc=%d\n", rc); 842 return rc; 843 } 844 845 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 846 { 847 struct ata_link *link; 848 unsigned long flags; 849 int rc; 850 851 spin_lock_irqsave(ap->lock, flags); 852 853 ata_for_each_link(link, ap, EDGE) { 854 if (!(link->flags & ATA_LFLAG_DISABLED)) 855 continue; 856 857 spin_unlock_irqrestore(ap->lock, flags); 858 859 /* Some PMPs require hardreset sequence to get 860 * SError.N working. 861 */ 862 sata_link_hardreset(link, sata_deb_timing_normal, 863 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 864 NULL, NULL); 865 866 /* unconditionally clear SError.N */ 867 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 868 if (rc) { 869 ata_link_err(link, 870 "failed to clear SError.N (errno=%d)\n", 871 rc); 872 return rc; 873 } 874 875 spin_lock_irqsave(ap->lock, flags); 876 } 877 878 spin_unlock_irqrestore(ap->lock, flags); 879 880 return 0; 881 } 882 883 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 884 { 885 struct ata_port *ap = link->ap; 886 unsigned long flags; 887 888 if (link_tries[link->pmp] && --link_tries[link->pmp]) 889 return 1; 890 891 /* disable this link */ 892 if (!(link->flags & ATA_LFLAG_DISABLED)) { 893 ata_link_warn(link, 894 "failed to recover link after %d tries, disabling\n", 895 ATA_EH_PMP_LINK_TRIES); 896 897 spin_lock_irqsave(ap->lock, flags); 898 link->flags |= ATA_LFLAG_DISABLED; 899 spin_unlock_irqrestore(ap->lock, flags); 900 } 901 902 ata_dev_disable(link->device); 903 link->eh_context.i.action = 0; 904 905 return 0; 906 } 907 908 /** 909 * sata_pmp_eh_recover - recover PMP-enabled port 910 * @ap: ATA port to recover 911 * 912 * Drive EH recovery operation for PMP enabled port @ap. This 913 * function recovers host and PMP ports with proper retrials and 914 * fallbacks. Actual recovery operations are performed using 915 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 916 * 917 * LOCKING: 918 * Kernel thread context (may sleep). 919 * 920 * RETURNS: 921 * 0 on success, -errno on failure. 922 */ 923 static int sata_pmp_eh_recover(struct ata_port *ap) 924 { 925 struct ata_port_operations *ops = ap->ops; 926 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 927 struct ata_link *pmp_link = &ap->link; 928 struct ata_device *pmp_dev = pmp_link->device; 929 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 930 u32 *gscr = pmp_dev->gscr; 931 struct ata_link *link; 932 struct ata_device *dev; 933 unsigned int err_mask; 934 u32 gscr_error, sntf; 935 int cnt, rc; 936 937 pmp_tries = ATA_EH_PMP_TRIES; 938 ata_for_each_link(link, ap, EDGE) 939 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 940 941 retry: 942 /* PMP attached? */ 943 if (!sata_pmp_attached(ap)) { 944 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 945 ops->hardreset, ops->postreset, NULL); 946 if (rc) { 947 ata_for_each_dev(dev, &ap->link, ALL) 948 ata_dev_disable(dev); 949 return rc; 950 } 951 952 if (pmp_dev->class != ATA_DEV_PMP) 953 return 0; 954 955 /* new PMP online */ 956 ata_for_each_link(link, ap, EDGE) 957 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 958 959 /* fall through */ 960 } 961 962 /* recover pmp */ 963 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 964 ops->hardreset, ops->postreset); 965 if (rc) 966 goto pmp_fail; 967 968 /* PHY event notification can disturb reset and other recovery 969 * operations. Turn it off. 970 */ 971 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 972 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 973 974 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 975 gscr[SATA_PMP_GSCR_FEAT_EN]); 976 if (err_mask) { 977 ata_link_warn(pmp_link, 978 "failed to disable NOTIFY (err_mask=0x%x)\n", 979 err_mask); 980 goto pmp_fail; 981 } 982 } 983 984 /* handle disabled links */ 985 rc = sata_pmp_eh_handle_disabled_links(ap); 986 if (rc) 987 goto pmp_fail; 988 989 /* recover links */ 990 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 991 ops->pmp_hardreset, ops->pmp_postreset, &link); 992 if (rc) 993 goto link_fail; 994 995 /* clear SNotification */ 996 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 997 if (rc == 0) 998 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 999 1000 /* 1001 * If LPM is active on any fan-out port, hotplug wouldn't 1002 * work. Return w/ PHY event notification disabled. 1003 */ 1004 ata_for_each_link(link, ap, EDGE) 1005 if (link->lpm_policy > ATA_LPM_MAX_POWER) 1006 return 0; 1007 1008 /* 1009 * Connection status might have changed while resetting other 1010 * links, enable notification and check SATA_PMP_GSCR_ERROR 1011 * before returning. 1012 */ 1013 1014 /* enable notification */ 1015 if (pmp_dev->flags & ATA_DFLAG_AN) { 1016 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1017 1018 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 1019 gscr[SATA_PMP_GSCR_FEAT_EN]); 1020 if (err_mask) { 1021 ata_dev_err(pmp_dev, 1022 "failed to write PMP_FEAT_EN (Emask=0x%x)\n", 1023 err_mask); 1024 rc = -EIO; 1025 goto pmp_fail; 1026 } 1027 } 1028 1029 /* check GSCR_ERROR */ 1030 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1031 if (err_mask) { 1032 ata_dev_err(pmp_dev, 1033 "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n", 1034 err_mask); 1035 rc = -EIO; 1036 goto pmp_fail; 1037 } 1038 1039 cnt = 0; 1040 ata_for_each_link(link, ap, EDGE) { 1041 if (!(gscr_error & (1 << link->pmp))) 1042 continue; 1043 1044 if (sata_pmp_handle_link_fail(link, link_tries)) { 1045 ata_ehi_hotplugged(&link->eh_context.i); 1046 cnt++; 1047 } else { 1048 ata_link_warn(link, 1049 "PHY status changed but maxed out on retries, giving up\n"); 1050 ata_link_warn(link, 1051 "Manually issue scan to resume this link\n"); 1052 } 1053 } 1054 1055 if (cnt) { 1056 ata_port_info(ap, 1057 "PMP SError.N set for some ports, repeating recovery\n"); 1058 goto retry; 1059 } 1060 1061 return 0; 1062 1063 link_fail: 1064 if (sata_pmp_handle_link_fail(link, link_tries)) { 1065 pmp_ehc->i.action |= ATA_EH_RESET; 1066 goto retry; 1067 } 1068 1069 /* fall through */ 1070 pmp_fail: 1071 /* Control always ends up here after detaching PMP. Shut up 1072 * and return if we're unloading. 1073 */ 1074 if (ap->pflags & ATA_PFLAG_UNLOADING) 1075 return rc; 1076 1077 if (!sata_pmp_attached(ap)) 1078 goto retry; 1079 1080 if (--pmp_tries) { 1081 pmp_ehc->i.action |= ATA_EH_RESET; 1082 goto retry; 1083 } 1084 1085 ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n", 1086 ATA_EH_PMP_TRIES); 1087 sata_pmp_detach(pmp_dev); 1088 ata_dev_disable(pmp_dev); 1089 1090 return rc; 1091 } 1092 1093 /** 1094 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1095 * @ap: host port to handle error for 1096 * 1097 * Perform standard error handling sequence for PMP-enabled host 1098 * @ap. 1099 * 1100 * LOCKING: 1101 * Kernel thread context (may sleep). 1102 */ 1103 void sata_pmp_error_handler(struct ata_port *ap) 1104 { 1105 ata_eh_autopsy(ap); 1106 ata_eh_report(ap); 1107 sata_pmp_eh_recover(ap); 1108 ata_eh_finish(ap); 1109 } 1110 1111 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1112 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1113 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1114