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_printk(link, KERN_WARNING, "failed to read SCR %d " 151 "(Emask=0x%x)\n", 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_printk(link, KERN_WARNING, "failed to write SCR %d " 182 "(Emask=0x%x)\n", 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_printk(dev, KERN_ERR, "failed to read PMP " 235 "GSCR[%d] (Emask=0x%x)\n", 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_printk(dev, KERN_INFO, "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_printk(dev, KERN_INFO, 323 "Asynchronous notification not supported, " 324 "hotplug won't\n work on fan-out " 325 "ports. Use warm-plug instead.\n"); 326 } 327 328 return 0; 329 330 fail: 331 ata_dev_printk(dev, KERN_ERR, 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_printk(dev, KERN_ERR, 489 "host does not support Port Multiplier\n"); 490 return -EINVAL; 491 } 492 493 if (!ata_is_host_link(link)) { 494 ata_dev_printk(dev, KERN_ERR, 495 "Port Multipliers cannot be nested\n"); 496 return -EINVAL; 497 } 498 499 if (dev->devno) { 500 ata_dev_printk(dev, KERN_ERR, 501 "Port Multiplier must be the first device\n"); 502 return -EINVAL; 503 } 504 505 WARN_ON(link->pmp != 0); 506 link->pmp = SATA_PMP_CTRL_PORT; 507 508 /* read GSCR block */ 509 rc = sata_pmp_read_gscr(dev, dev->gscr); 510 if (rc) 511 goto fail; 512 513 /* config PMP */ 514 rc = sata_pmp_configure(dev, 1); 515 if (rc) 516 goto fail; 517 518 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 519 if (rc) { 520 ata_dev_printk(dev, KERN_INFO, 521 "failed to initialize PMP links\n"); 522 goto fail; 523 } 524 525 /* attach it */ 526 spin_lock_irqsave(ap->lock, flags); 527 WARN_ON(ap->nr_pmp_links); 528 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 529 spin_unlock_irqrestore(ap->lock, flags); 530 531 sata_pmp_quirks(ap); 532 533 if (ap->ops->pmp_attach) 534 ap->ops->pmp_attach(ap); 535 536 ata_for_each_link(tlink, ap, EDGE) 537 sata_link_init_spd(tlink); 538 539 ata_acpi_associate_sata_port(ap); 540 541 return 0; 542 543 fail: 544 link->pmp = 0; 545 return rc; 546 } 547 548 /** 549 * sata_pmp_detach - detach a SATA PMP device 550 * @dev: SATA PMP device to detach 551 * 552 * Detach SATA PMP device @dev. This function is also 553 * responsible for deconfiguring PMP links. 554 * 555 * LOCKING: 556 * Kernel thread context (may sleep). 557 */ 558 static void sata_pmp_detach(struct ata_device *dev) 559 { 560 struct ata_link *link = dev->link; 561 struct ata_port *ap = link->ap; 562 struct ata_link *tlink; 563 unsigned long flags; 564 565 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 566 567 WARN_ON(!ata_is_host_link(link) || dev->devno || 568 link->pmp != SATA_PMP_CTRL_PORT); 569 570 if (ap->ops->pmp_detach) 571 ap->ops->pmp_detach(ap); 572 573 ata_for_each_link(tlink, ap, EDGE) 574 ata_eh_detach_dev(tlink->device); 575 576 spin_lock_irqsave(ap->lock, flags); 577 ap->nr_pmp_links = 0; 578 link->pmp = 0; 579 spin_unlock_irqrestore(ap->lock, flags); 580 581 ata_acpi_associate_sata_port(ap); 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_printk(dev, KERN_INFO, "Port Multiplier " 613 "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_printk(dev, KERN_INFO, "Port Multiplier " 620 "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_printk(dev, KERN_INFO, "Port Multiplier " 627 "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_printk(dev, KERN_ERR, 695 "PMP revalidation failed (errno=%d)\n", rc); 696 DPRINTK("EXIT, rc=%d\n", rc); 697 return rc; 698 } 699 700 /** 701 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 702 * @dev: PMP device to revalidate 703 * 704 * Make sure the attached PMP is accessible. 705 * 706 * LOCKING: 707 * Kernel thread context (may sleep). 708 * 709 * RETURNS: 710 * 0 on success, -errno otherwise. 711 */ 712 static int sata_pmp_revalidate_quick(struct ata_device *dev) 713 { 714 unsigned int err_mask; 715 u32 prod_id; 716 717 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 718 if (err_mask) { 719 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 720 "(Emask=0x%x)\n", err_mask); 721 return -EIO; 722 } 723 724 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 725 ata_dev_printk(dev, KERN_ERR, "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_printk(link, KERN_ERR, 781 "failed to reset PMP, giving up\n"); 782 goto fail; 783 } 784 785 /* PMP is reset, SErrors cannot be trusted, scan all */ 786 ata_for_each_link(tlink, ap, EDGE) { 787 struct ata_eh_context *ehc = &tlink->eh_context; 788 789 ehc->i.probe_mask |= ATA_ALL_DEVICES; 790 ehc->i.action |= ATA_EH_RESET; 791 } 792 } 793 794 /* If revalidation is requested, revalidate and reconfigure; 795 * otherwise, do quick revalidation. 796 */ 797 if (ehc->i.action & ATA_EH_REVALIDATE) 798 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 799 else 800 rc = sata_pmp_revalidate_quick(dev); 801 802 if (rc) { 803 tries--; 804 805 if (rc == -ENODEV) { 806 ehc->i.probe_mask |= ATA_ALL_DEVICES; 807 detach = 1; 808 /* give it just two more chances */ 809 tries = min(tries, 2); 810 } 811 812 if (tries) { 813 /* consecutive revalidation failures? speed down */ 814 if (reval_failed) 815 sata_down_spd_limit(link, 0); 816 else 817 reval_failed = 1; 818 819 ehc->i.action |= ATA_EH_RESET; 820 goto retry; 821 } else { 822 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 823 "after %d tries, giving up\n", 824 ATA_EH_PMP_TRIES); 825 goto fail; 826 } 827 } 828 829 /* okay, PMP resurrected */ 830 ehc->i.flags = 0; 831 832 DPRINTK("EXIT, rc=0\n"); 833 return 0; 834 835 fail: 836 sata_pmp_detach(dev); 837 if (detach) 838 ata_eh_detach_dev(dev); 839 else 840 ata_dev_disable(dev); 841 842 DPRINTK("EXIT, rc=%d\n", rc); 843 return rc; 844 } 845 846 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 847 { 848 struct ata_link *link; 849 unsigned long flags; 850 int rc; 851 852 spin_lock_irqsave(ap->lock, flags); 853 854 ata_for_each_link(link, ap, EDGE) { 855 if (!(link->flags & ATA_LFLAG_DISABLED)) 856 continue; 857 858 spin_unlock_irqrestore(ap->lock, flags); 859 860 /* Some PMPs require hardreset sequence to get 861 * SError.N working. 862 */ 863 sata_link_hardreset(link, sata_deb_timing_normal, 864 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 865 NULL, NULL); 866 867 /* unconditionally clear SError.N */ 868 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 869 if (rc) { 870 ata_link_printk(link, KERN_ERR, "failed to clear " 871 "SError.N (errno=%d)\n", 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_printk(link, KERN_WARNING, 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_printk(pmp_link, KERN_WARNING, 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_printk(pmp_dev, KERN_ERR, "failed to write " 1022 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 1023 rc = -EIO; 1024 goto pmp_fail; 1025 } 1026 } 1027 1028 /* check GSCR_ERROR */ 1029 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1030 if (err_mask) { 1031 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 1032 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 1033 rc = -EIO; 1034 goto pmp_fail; 1035 } 1036 1037 cnt = 0; 1038 ata_for_each_link(link, ap, EDGE) { 1039 if (!(gscr_error & (1 << link->pmp))) 1040 continue; 1041 1042 if (sata_pmp_handle_link_fail(link, link_tries)) { 1043 ata_ehi_hotplugged(&link->eh_context.i); 1044 cnt++; 1045 } else { 1046 ata_link_printk(link, KERN_WARNING, 1047 "PHY status changed but maxed out on retries, " 1048 "giving up\n"); 1049 ata_link_printk(link, KERN_WARNING, 1050 "Manully issue scan to resume this link\n"); 1051 } 1052 } 1053 1054 if (cnt) { 1055 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 1056 "ports, repeating recovery\n"); 1057 goto retry; 1058 } 1059 1060 return 0; 1061 1062 link_fail: 1063 if (sata_pmp_handle_link_fail(link, link_tries)) { 1064 pmp_ehc->i.action |= ATA_EH_RESET; 1065 goto retry; 1066 } 1067 1068 /* fall through */ 1069 pmp_fail: 1070 /* Control always ends up here after detaching PMP. Shut up 1071 * and return if we're unloading. 1072 */ 1073 if (ap->pflags & ATA_PFLAG_UNLOADING) 1074 return rc; 1075 1076 if (!sata_pmp_attached(ap)) 1077 goto retry; 1078 1079 if (--pmp_tries) { 1080 pmp_ehc->i.action |= ATA_EH_RESET; 1081 goto retry; 1082 } 1083 1084 ata_port_printk(ap, KERN_ERR, 1085 "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