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 "libata.h" 13 14 /** 15 * sata_pmp_read - read PMP register 16 * @link: link to read PMP register for 17 * @reg: register to read 18 * @r_val: resulting value 19 * 20 * Read PMP register. 21 * 22 * LOCKING: 23 * Kernel thread context (may sleep). 24 * 25 * RETURNS: 26 * 0 on success, AC_ERR_* mask on failure. 27 */ 28 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 29 { 30 struct ata_port *ap = link->ap; 31 struct ata_device *pmp_dev = ap->link.device; 32 struct ata_taskfile tf; 33 unsigned int err_mask; 34 35 ata_tf_init(pmp_dev, &tf); 36 tf.command = ATA_CMD_PMP_READ; 37 tf.protocol = ATA_PROT_NODATA; 38 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 39 tf.feature = reg; 40 tf.device = link->pmp; 41 42 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 43 SATA_PMP_SCR_TIMEOUT); 44 if (err_mask) 45 return err_mask; 46 47 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 48 return 0; 49 } 50 51 /** 52 * sata_pmp_write - write PMP register 53 * @link: link to write PMP register for 54 * @reg: register to write 55 * @r_val: value to write 56 * 57 * Write PMP register. 58 * 59 * LOCKING: 60 * Kernel thread context (may sleep). 61 * 62 * RETURNS: 63 * 0 on success, AC_ERR_* mask on failure. 64 */ 65 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 66 { 67 struct ata_port *ap = link->ap; 68 struct ata_device *pmp_dev = ap->link.device; 69 struct ata_taskfile tf; 70 71 ata_tf_init(pmp_dev, &tf); 72 tf.command = ATA_CMD_PMP_WRITE; 73 tf.protocol = ATA_PROT_NODATA; 74 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 75 tf.feature = reg; 76 tf.device = link->pmp; 77 tf.nsect = val & 0xff; 78 tf.lbal = (val >> 8) & 0xff; 79 tf.lbam = (val >> 16) & 0xff; 80 tf.lbah = (val >> 24) & 0xff; 81 82 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 83 SATA_PMP_SCR_TIMEOUT); 84 } 85 86 /** 87 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 88 * @qc: ATA command in question 89 * 90 * A host which has command switching PMP support cannot issue 91 * commands to multiple links simultaneously. 92 * 93 * LOCKING: 94 * spin_lock_irqsave(host lock) 95 * 96 * RETURNS: 97 * ATA_DEFER_* if deferring is needed, 0 otherwise. 98 */ 99 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 100 { 101 struct ata_link *link = qc->dev->link; 102 struct ata_port *ap = link->ap; 103 104 if (ap->excl_link == NULL || ap->excl_link == link) { 105 if (ap->nr_active_links == 0 || ata_link_active(link)) { 106 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 107 return ata_std_qc_defer(qc); 108 } 109 110 ap->excl_link = link; 111 } 112 113 return ATA_DEFER_PORT; 114 } 115 116 /** 117 * sata_pmp_scr_read - read PSCR 118 * @link: ATA link to read PSCR for 119 * @reg: PSCR to read 120 * @r_val: resulting value 121 * 122 * Read PSCR @reg into @r_val for @link, to be called from 123 * ata_scr_read(). 124 * 125 * LOCKING: 126 * Kernel thread context (may sleep). 127 * 128 * RETURNS: 129 * 0 on success, -errno on failure. 130 */ 131 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 132 { 133 unsigned int err_mask; 134 135 if (reg > SATA_PMP_PSCR_CONTROL) 136 return -EINVAL; 137 138 err_mask = sata_pmp_read(link, reg, r_val); 139 if (err_mask) { 140 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " 141 "(Emask=0x%x)\n", reg, err_mask); 142 return -EIO; 143 } 144 return 0; 145 } 146 147 /** 148 * sata_pmp_scr_write - write PSCR 149 * @link: ATA link to write PSCR for 150 * @reg: PSCR to write 151 * @val: value to be written 152 * 153 * Write @val to PSCR @reg for @link, to be called from 154 * ata_scr_write() and ata_scr_write_flush(). 155 * 156 * LOCKING: 157 * Kernel thread context (may sleep). 158 * 159 * RETURNS: 160 * 0 on success, -errno on failure. 161 */ 162 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 163 { 164 unsigned int err_mask; 165 166 if (reg > SATA_PMP_PSCR_CONTROL) 167 return -EINVAL; 168 169 err_mask = sata_pmp_write(link, reg, val); 170 if (err_mask) { 171 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " 172 "(Emask=0x%x)\n", reg, err_mask); 173 return -EIO; 174 } 175 return 0; 176 } 177 178 /** 179 * sata_pmp_std_prereset - prepare PMP link for reset 180 * @link: link to be reset 181 * @deadline: deadline jiffies for the operation 182 * 183 * @link is about to be reset. Initialize it. 184 * 185 * LOCKING: 186 * Kernel thread context (may sleep) 187 * 188 * RETURNS: 189 * 0 on success, -errno otherwise. 190 */ 191 int sata_pmp_std_prereset(struct ata_link *link, unsigned long deadline) 192 { 193 struct ata_eh_context *ehc = &link->eh_context; 194 const unsigned long *timing = sata_ehc_deb_timing(ehc); 195 int rc; 196 197 /* force HRST? */ 198 if (link->flags & ATA_LFLAG_NO_SRST) 199 ehc->i.action |= ATA_EH_HARDRESET; 200 201 /* handle link resume */ 202 if ((ehc->i.flags & ATA_EHI_RESUME_LINK) && 203 (link->flags & ATA_LFLAG_HRST_TO_RESUME)) 204 ehc->i.action |= ATA_EH_HARDRESET; 205 206 /* if we're about to do hardreset, nothing more to do */ 207 if (ehc->i.action & ATA_EH_HARDRESET) 208 return 0; 209 210 /* resume link */ 211 rc = sata_link_resume(link, timing, deadline); 212 if (rc) { 213 /* phy resume failed */ 214 ata_link_printk(link, KERN_WARNING, "failed to resume link " 215 "for reset (errno=%d)\n", rc); 216 return rc; 217 } 218 219 /* clear SError bits including .X which blocks the port when set */ 220 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); 221 if (rc) { 222 ata_link_printk(link, KERN_ERR, 223 "failed to clear SError (errno=%d)\n", rc); 224 return rc; 225 } 226 227 return 0; 228 } 229 230 /** 231 * sata_pmp_std_hardreset - standard hardreset method for PMP link 232 * @link: link to be reset 233 * @class: resulting class of attached device 234 * @deadline: deadline jiffies for the operation 235 * 236 * Hardreset PMP port @link. Note that this function doesn't 237 * wait for BSY clearance. There simply isn't a generic way to 238 * wait the event. Instead, this function return -EAGAIN thus 239 * telling libata-EH to followup with softreset. 240 * 241 * LOCKING: 242 * Kernel thread context (may sleep) 243 * 244 * RETURNS: 245 * 0 on success, -errno otherwise. 246 */ 247 int sata_pmp_std_hardreset(struct ata_link *link, unsigned int *class, 248 unsigned long deadline) 249 { 250 const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context); 251 u32 tmp; 252 int rc; 253 254 DPRINTK("ENTER\n"); 255 256 /* do hardreset */ 257 rc = sata_link_hardreset(link, timing, deadline); 258 if (rc) { 259 ata_link_printk(link, KERN_ERR, 260 "COMRESET failed (errno=%d)\n", rc); 261 goto out; 262 } 263 264 /* clear SError bits including .X which blocks the port when set */ 265 rc = sata_scr_write(link, SCR_ERROR, 0xffffffff); 266 if (rc) { 267 ata_link_printk(link, KERN_ERR, "failed to clear SError " 268 "during hardreset (errno=%d)\n", rc); 269 goto out; 270 } 271 272 /* if device is present, follow up with srst to wait for !BSY */ 273 if (ata_link_online(link)) 274 rc = -EAGAIN; 275 out: 276 /* if SCR isn't accessible, we need to reset the PMP */ 277 if (rc && rc != -EAGAIN && sata_scr_read(link, SCR_STATUS, &tmp)) 278 rc = -ERESTART; 279 280 DPRINTK("EXIT, rc=%d\n", rc); 281 return rc; 282 } 283 284 /** 285 * ata_std_postreset - standard postreset method for PMP link 286 * @link: the target ata_link 287 * @classes: classes of attached devices 288 * 289 * This function is invoked after a successful reset. Note that 290 * the device might have been reset more than once using 291 * different reset methods before postreset is invoked. 292 * 293 * LOCKING: 294 * Kernel thread context (may sleep) 295 */ 296 void sata_pmp_std_postreset(struct ata_link *link, unsigned int *class) 297 { 298 u32 serror; 299 300 DPRINTK("ENTER\n"); 301 302 /* clear SError */ 303 if (sata_scr_read(link, SCR_ERROR, &serror) == 0) 304 sata_scr_write(link, SCR_ERROR, serror); 305 306 /* print link status */ 307 sata_print_link_status(link); 308 309 DPRINTK("EXIT\n"); 310 } 311 312 /** 313 * sata_pmp_read_gscr - read GSCR block of SATA PMP 314 * @dev: PMP device 315 * @gscr: buffer to read GSCR block into 316 * 317 * Read selected PMP GSCRs from the PMP at @dev. This will serve 318 * as configuration and identification info for the PMP. 319 * 320 * LOCKING: 321 * Kernel thread context (may sleep). 322 * 323 * RETURNS: 324 * 0 on success, -errno on failure. 325 */ 326 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 327 { 328 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 329 int i; 330 331 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 332 int reg = gscr_to_read[i]; 333 unsigned int err_mask; 334 335 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 336 if (err_mask) { 337 ata_dev_printk(dev, KERN_ERR, "failed to read PMP " 338 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); 339 return -EIO; 340 } 341 } 342 343 return 0; 344 } 345 346 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 347 { 348 u32 rev = gscr[SATA_PMP_GSCR_REV]; 349 350 if (rev & (1 << 2)) 351 return "1.1"; 352 if (rev & (1 << 1)) 353 return "1.0"; 354 return "<unknown>"; 355 } 356 357 static int sata_pmp_configure(struct ata_device *dev, int print_info) 358 { 359 struct ata_port *ap = dev->link->ap; 360 u32 *gscr = dev->gscr; 361 unsigned int err_mask = 0; 362 const char *reason; 363 int nr_ports, rc; 364 365 nr_ports = sata_pmp_gscr_ports(gscr); 366 367 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 368 rc = -EINVAL; 369 reason = "invalid nr_ports"; 370 goto fail; 371 } 372 373 if ((ap->flags & ATA_FLAG_AN) && 374 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 375 dev->flags |= ATA_DFLAG_AN; 376 377 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 378 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 379 SERR_PHYRDY_CHG); 380 if (err_mask) { 381 rc = -EIO; 382 reason = "failed to write GSCR_ERROR_EN"; 383 goto fail; 384 } 385 386 /* turn off notification till fan-out ports are reset and configured */ 387 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 388 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 389 390 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, 391 gscr[SATA_PMP_GSCR_FEAT_EN]); 392 if (err_mask) { 393 rc = -EIO; 394 reason = "failed to write GSCR_FEAT_EN"; 395 goto fail; 396 } 397 } 398 399 if (print_info) { 400 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " 401 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 402 sata_pmp_spec_rev_str(gscr), 403 sata_pmp_gscr_vendor(gscr), 404 sata_pmp_gscr_devid(gscr), 405 sata_pmp_gscr_rev(gscr), 406 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 407 gscr[SATA_PMP_GSCR_FEAT]); 408 409 if (!(dev->flags & ATA_DFLAG_AN)) 410 ata_dev_printk(dev, KERN_INFO, 411 "Asynchronous notification not supported, " 412 "hotplug won't\n work on fan-out " 413 "ports. Use warm-plug instead.\n"); 414 } 415 416 return 0; 417 418 fail: 419 ata_dev_printk(dev, KERN_ERR, 420 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 421 reason, err_mask); 422 return rc; 423 } 424 425 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) 426 { 427 struct ata_link *pmp_link = ap->pmp_link; 428 int i; 429 430 if (!pmp_link) { 431 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 432 GFP_NOIO); 433 if (!pmp_link) 434 return -ENOMEM; 435 436 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 437 ata_link_init(ap, &pmp_link[i], i); 438 439 ap->pmp_link = pmp_link; 440 } 441 442 for (i = 0; i < nr_ports; i++) { 443 struct ata_link *link = &pmp_link[i]; 444 struct ata_eh_context *ehc = &link->eh_context; 445 446 link->flags = 0; 447 ehc->i.probe_mask |= 1; 448 ehc->i.action |= ATA_EH_SOFTRESET; 449 ehc->i.flags |= ATA_EHI_RESUME_LINK; 450 } 451 452 return 0; 453 } 454 455 static void sata_pmp_quirks(struct ata_port *ap) 456 { 457 u32 *gscr = ap->link.device->gscr; 458 u16 vendor = sata_pmp_gscr_vendor(gscr); 459 u16 devid = sata_pmp_gscr_devid(gscr); 460 struct ata_link *link; 461 462 if (vendor == 0x1095 && devid == 0x3726) { 463 /* sil3726 quirks */ 464 ata_port_for_each_link(link, ap) { 465 /* SError.N need a kick in the ass to get working */ 466 link->flags |= ATA_LFLAG_HRST_TO_RESUME; 467 468 /* class code report is unreliable */ 469 if (link->pmp < 5) 470 link->flags |= ATA_LFLAG_ASSUME_ATA; 471 472 /* port 5 is for SEMB device and it doesn't like SRST */ 473 if (link->pmp == 5) 474 link->flags |= ATA_LFLAG_NO_SRST | 475 ATA_LFLAG_ASSUME_SEMB; 476 } 477 } else if (vendor == 0x1095 && devid == 0x4723) { 478 /* sil4723 quirks */ 479 ata_port_for_each_link(link, ap) { 480 /* SError.N need a kick in the ass to get working */ 481 link->flags |= ATA_LFLAG_HRST_TO_RESUME; 482 483 /* class code report is unreliable */ 484 if (link->pmp < 2) 485 link->flags |= ATA_LFLAG_ASSUME_ATA; 486 487 /* the config device at port 2 locks up on SRST */ 488 if (link->pmp == 2) 489 link->flags |= ATA_LFLAG_NO_SRST | 490 ATA_LFLAG_ASSUME_ATA; 491 } 492 } else if (vendor == 0x1095 && devid == 0x4726) { 493 /* sil4726 quirks */ 494 ata_port_for_each_link(link, ap) { 495 /* SError.N need a kick in the ass to get working */ 496 link->flags |= ATA_LFLAG_HRST_TO_RESUME; 497 498 /* Class code report is unreliable and SRST 499 * times out under certain configurations. 500 * Config device can be at port 0 or 5 and 501 * locks up on SRST. 502 */ 503 if (link->pmp <= 5) 504 link->flags |= ATA_LFLAG_NO_SRST | 505 ATA_LFLAG_ASSUME_ATA; 506 507 /* Port 6 is for SEMB device which doesn't 508 * like SRST either. 509 */ 510 if (link->pmp == 6) 511 link->flags |= ATA_LFLAG_NO_SRST | 512 ATA_LFLAG_ASSUME_SEMB; 513 } 514 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 515 devid == 0x5734 || devid == 0x5744)) { 516 /* sil5723/5744 quirks */ 517 518 /* sil5723/5744 has either two or three downstream 519 * ports depending on operation mode. The last port 520 * is empty if any actual IO device is available or 521 * occupied by a pseudo configuration device 522 * otherwise. Don't try hard to recover it. 523 */ 524 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 525 } else if (vendor == 0x11ab && devid == 0x4140) { 526 /* Marvell 88SM4140 quirks. Fan-out ports require PHY 527 * reset to work; other than that, it behaves very 528 * nicely. 529 */ 530 ata_port_for_each_link(link, ap) 531 link->flags |= ATA_LFLAG_HRST_TO_RESUME; 532 } 533 } 534 535 /** 536 * sata_pmp_attach - attach a SATA PMP device 537 * @dev: SATA PMP device to attach 538 * 539 * Configure and attach SATA PMP device @dev. This function is 540 * also responsible for allocating and initializing PMP links. 541 * 542 * LOCKING: 543 * Kernel thread context (may sleep). 544 * 545 * RETURNS: 546 * 0 on success, -errno on failure. 547 */ 548 int sata_pmp_attach(struct ata_device *dev) 549 { 550 struct ata_link *link = dev->link; 551 struct ata_port *ap = link->ap; 552 unsigned long flags; 553 struct ata_link *tlink; 554 int rc; 555 556 /* is it hanging off the right place? */ 557 if (!(ap->flags & ATA_FLAG_PMP)) { 558 ata_dev_printk(dev, KERN_ERR, 559 "host does not support Port Multiplier\n"); 560 return -EINVAL; 561 } 562 563 if (!ata_is_host_link(link)) { 564 ata_dev_printk(dev, KERN_ERR, 565 "Port Multipliers cannot be nested\n"); 566 return -EINVAL; 567 } 568 569 if (dev->devno) { 570 ata_dev_printk(dev, KERN_ERR, 571 "Port Multiplier must be the first device\n"); 572 return -EINVAL; 573 } 574 575 WARN_ON(link->pmp != 0); 576 link->pmp = SATA_PMP_CTRL_PORT; 577 578 /* read GSCR block */ 579 rc = sata_pmp_read_gscr(dev, dev->gscr); 580 if (rc) 581 goto fail; 582 583 /* config PMP */ 584 rc = sata_pmp_configure(dev, 1); 585 if (rc) 586 goto fail; 587 588 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 589 if (rc) { 590 ata_dev_printk(dev, KERN_INFO, 591 "failed to initialize PMP links\n"); 592 goto fail; 593 } 594 595 /* attach it */ 596 spin_lock_irqsave(ap->lock, flags); 597 WARN_ON(ap->nr_pmp_links); 598 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 599 spin_unlock_irqrestore(ap->lock, flags); 600 601 sata_pmp_quirks(ap); 602 603 if (ap->ops->pmp_attach) 604 ap->ops->pmp_attach(ap); 605 606 ata_port_for_each_link(tlink, ap) 607 sata_link_init_spd(tlink); 608 609 ata_acpi_associate_sata_port(ap); 610 611 return 0; 612 613 fail: 614 link->pmp = 0; 615 return rc; 616 } 617 618 /** 619 * sata_pmp_detach - detach a SATA PMP device 620 * @dev: SATA PMP device to detach 621 * 622 * Detach SATA PMP device @dev. This function is also 623 * responsible for deconfiguring PMP links. 624 * 625 * LOCKING: 626 * Kernel thread context (may sleep). 627 */ 628 static void sata_pmp_detach(struct ata_device *dev) 629 { 630 struct ata_link *link = dev->link; 631 struct ata_port *ap = link->ap; 632 struct ata_link *tlink; 633 unsigned long flags; 634 635 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 636 637 WARN_ON(!ata_is_host_link(link) || dev->devno || 638 link->pmp != SATA_PMP_CTRL_PORT); 639 640 if (ap->ops->pmp_detach) 641 ap->ops->pmp_detach(ap); 642 643 ata_port_for_each_link(tlink, ap) 644 ata_eh_detach_dev(tlink->device); 645 646 spin_lock_irqsave(ap->lock, flags); 647 ap->nr_pmp_links = 0; 648 link->pmp = 0; 649 spin_unlock_irqrestore(ap->lock, flags); 650 651 ata_acpi_associate_sata_port(ap); 652 } 653 654 /** 655 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 656 * @dev: PMP device to compare against 657 * @new_gscr: GSCR block of the new device 658 * 659 * Compare @new_gscr against @dev and determine whether @dev is 660 * the PMP described by @new_gscr. 661 * 662 * LOCKING: 663 * None. 664 * 665 * RETURNS: 666 * 1 if @dev matches @new_gscr, 0 otherwise. 667 */ 668 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 669 { 670 const u32 *old_gscr = dev->gscr; 671 u16 old_vendor, new_vendor, old_devid, new_devid; 672 int old_nr_ports, new_nr_ports; 673 674 old_vendor = sata_pmp_gscr_vendor(old_gscr); 675 new_vendor = sata_pmp_gscr_vendor(new_gscr); 676 old_devid = sata_pmp_gscr_devid(old_gscr); 677 new_devid = sata_pmp_gscr_devid(new_gscr); 678 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 679 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 680 681 if (old_vendor != new_vendor) { 682 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 683 "vendor mismatch '0x%x' != '0x%x'\n", 684 old_vendor, new_vendor); 685 return 0; 686 } 687 688 if (old_devid != new_devid) { 689 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 690 "device ID mismatch '0x%x' != '0x%x'\n", 691 old_devid, new_devid); 692 return 0; 693 } 694 695 if (old_nr_ports != new_nr_ports) { 696 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 697 "nr_ports mismatch '0x%x' != '0x%x'\n", 698 old_nr_ports, new_nr_ports); 699 return 0; 700 } 701 702 return 1; 703 } 704 705 /** 706 * sata_pmp_revalidate - revalidate SATA PMP 707 * @dev: PMP device to revalidate 708 * @new_class: new class code 709 * 710 * Re-read GSCR block and make sure @dev is still attached to the 711 * port and properly configured. 712 * 713 * LOCKING: 714 * Kernel thread context (may sleep). 715 * 716 * RETURNS: 717 * 0 on success, -errno otherwise. 718 */ 719 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 720 { 721 struct ata_link *link = dev->link; 722 struct ata_port *ap = link->ap; 723 u32 *gscr = (void *)ap->sector_buf; 724 int rc; 725 726 DPRINTK("ENTER\n"); 727 728 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 729 730 if (!ata_dev_enabled(dev)) { 731 rc = -ENODEV; 732 goto fail; 733 } 734 735 /* wrong class? */ 736 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 737 rc = -ENODEV; 738 goto fail; 739 } 740 741 /* read GSCR */ 742 rc = sata_pmp_read_gscr(dev, gscr); 743 if (rc) 744 goto fail; 745 746 /* is the pmp still there? */ 747 if (!sata_pmp_same_pmp(dev, gscr)) { 748 rc = -ENODEV; 749 goto fail; 750 } 751 752 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 753 754 rc = sata_pmp_configure(dev, 0); 755 if (rc) 756 goto fail; 757 758 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 759 760 DPRINTK("EXIT, rc=0\n"); 761 return 0; 762 763 fail: 764 ata_dev_printk(dev, KERN_ERR, 765 "PMP revalidation failed (errno=%d)\n", rc); 766 DPRINTK("EXIT, rc=%d\n", rc); 767 return rc; 768 } 769 770 /** 771 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 772 * @dev: PMP device to revalidate 773 * 774 * Make sure the attached PMP is accessible. 775 * 776 * LOCKING: 777 * Kernel thread context (may sleep). 778 * 779 * RETURNS: 780 * 0 on success, -errno otherwise. 781 */ 782 static int sata_pmp_revalidate_quick(struct ata_device *dev) 783 { 784 unsigned int err_mask; 785 u32 prod_id; 786 787 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 788 if (err_mask) { 789 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 790 "(Emask=0x%x)\n", err_mask); 791 return -EIO; 792 } 793 794 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 795 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); 796 /* something weird is going on, request full PMP recovery */ 797 return -EIO; 798 } 799 800 return 0; 801 } 802 803 /** 804 * sata_pmp_eh_recover_pmp - recover PMP 805 * @ap: ATA port PMP is attached to 806 * @prereset: prereset method (can be NULL) 807 * @softreset: softreset method 808 * @hardreset: hardreset method 809 * @postreset: postreset method (can be NULL) 810 * 811 * Recover PMP attached to @ap. Recovery procedure is somewhat 812 * similar to that of ata_eh_recover() except that reset should 813 * always be performed in hard->soft sequence and recovery 814 * failure results in PMP detachment. 815 * 816 * LOCKING: 817 * Kernel thread context (may sleep). 818 * 819 * RETURNS: 820 * 0 on success, -errno on failure. 821 */ 822 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 823 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 824 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 825 { 826 struct ata_link *link = &ap->link; 827 struct ata_eh_context *ehc = &link->eh_context; 828 struct ata_device *dev = link->device; 829 int tries = ATA_EH_PMP_TRIES; 830 int detach = 0, rc = 0; 831 int reval_failed = 0; 832 833 DPRINTK("ENTER\n"); 834 835 if (dev->flags & ATA_DFLAG_DETACH) { 836 detach = 1; 837 goto fail; 838 } 839 840 retry: 841 ehc->classes[0] = ATA_DEV_UNKNOWN; 842 843 if (ehc->i.action & ATA_EH_RESET_MASK) { 844 struct ata_link *tlink; 845 846 ata_eh_freeze_port(ap); 847 848 /* reset */ 849 ehc->i.action = ATA_EH_HARDRESET; 850 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 851 postreset); 852 if (rc) { 853 ata_link_printk(link, KERN_ERR, 854 "failed to reset PMP, giving up\n"); 855 goto fail; 856 } 857 858 ata_eh_thaw_port(ap); 859 860 /* PMP is reset, SErrors cannot be trusted, scan all */ 861 ata_port_for_each_link(tlink, ap) 862 ata_ehi_schedule_probe(&tlink->eh_context.i); 863 } 864 865 /* If revalidation is requested, revalidate and reconfigure; 866 * otherwise, do quick revalidation. 867 */ 868 if (ehc->i.action & ATA_EH_REVALIDATE) 869 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 870 else 871 rc = sata_pmp_revalidate_quick(dev); 872 873 if (rc) { 874 tries--; 875 876 if (rc == -ENODEV) { 877 ehc->i.probe_mask |= 1; 878 detach = 1; 879 /* give it just two more chances */ 880 tries = min(tries, 2); 881 } 882 883 if (tries) { 884 int sleep = ehc->i.flags & ATA_EHI_DID_RESET; 885 886 /* consecutive revalidation failures? speed down */ 887 if (reval_failed) 888 sata_down_spd_limit(link); 889 else 890 reval_failed = 1; 891 892 ata_dev_printk(dev, KERN_WARNING, 893 "retrying hardreset%s\n", 894 sleep ? " in 5 secs" : ""); 895 if (sleep) 896 ssleep(5); 897 ehc->i.action |= ATA_EH_HARDRESET; 898 goto retry; 899 } else { 900 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 901 "after %d tries, giving up\n", 902 ATA_EH_PMP_TRIES); 903 goto fail; 904 } 905 } 906 907 /* okay, PMP resurrected */ 908 ehc->i.flags = 0; 909 910 DPRINTK("EXIT, rc=0\n"); 911 return 0; 912 913 fail: 914 sata_pmp_detach(dev); 915 if (detach) 916 ata_eh_detach_dev(dev); 917 else 918 ata_dev_disable(dev); 919 920 DPRINTK("EXIT, rc=%d\n", rc); 921 return rc; 922 } 923 924 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 925 { 926 struct ata_link *link; 927 unsigned long flags; 928 int rc; 929 930 spin_lock_irqsave(ap->lock, flags); 931 932 ata_port_for_each_link(link, ap) { 933 if (!(link->flags & ATA_LFLAG_DISABLED)) 934 continue; 935 936 spin_unlock_irqrestore(ap->lock, flags); 937 938 /* Some PMPs require hardreset sequence to get 939 * SError.N working. 940 */ 941 if ((link->flags & ATA_LFLAG_HRST_TO_RESUME) && 942 (link->eh_context.i.flags & ATA_EHI_RESUME_LINK)) 943 sata_link_hardreset(link, sata_deb_timing_normal, 944 jiffies + ATA_TMOUT_INTERNAL_QUICK); 945 946 /* unconditionally clear SError.N */ 947 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 948 if (rc) { 949 ata_link_printk(link, KERN_ERR, "failed to clear " 950 "SError.N (errno=%d)\n", rc); 951 return rc; 952 } 953 954 spin_lock_irqsave(ap->lock, flags); 955 } 956 957 spin_unlock_irqrestore(ap->lock, flags); 958 959 return 0; 960 } 961 962 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 963 { 964 struct ata_port *ap = link->ap; 965 unsigned long flags; 966 967 if (link_tries[link->pmp] && --link_tries[link->pmp]) 968 return 1; 969 970 /* disable this link */ 971 if (!(link->flags & ATA_LFLAG_DISABLED)) { 972 ata_link_printk(link, KERN_WARNING, 973 "failed to recover link after %d tries, disabling\n", 974 ATA_EH_PMP_LINK_TRIES); 975 976 spin_lock_irqsave(ap->lock, flags); 977 link->flags |= ATA_LFLAG_DISABLED; 978 spin_unlock_irqrestore(ap->lock, flags); 979 } 980 981 ata_dev_disable(link->device); 982 link->eh_context.i.action = 0; 983 984 return 0; 985 } 986 987 /** 988 * sata_pmp_eh_recover - recover PMP-enabled port 989 * @ap: ATA port to recover 990 * @prereset: prereset method (can be NULL) 991 * @softreset: softreset method 992 * @hardreset: hardreset method 993 * @postreset: postreset method (can be NULL) 994 * @pmp_prereset: PMP prereset method (can be NULL) 995 * @pmp_softreset: PMP softreset method (can be NULL) 996 * @pmp_hardreset: PMP hardreset method (can be NULL) 997 * @pmp_postreset: PMP postreset method (can be NULL) 998 * 999 * Drive EH recovery operation for PMP enabled port @ap. This 1000 * function recovers host and PMP ports with proper retrials and 1001 * fallbacks. Actual recovery operations are performed using 1002 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 1003 * 1004 * LOCKING: 1005 * Kernel thread context (may sleep). 1006 * 1007 * RETURNS: 1008 * 0 on success, -errno on failure. 1009 */ 1010 static int sata_pmp_eh_recover(struct ata_port *ap, 1011 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 1012 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, 1013 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, 1014 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) 1015 { 1016 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 1017 struct ata_link *pmp_link = &ap->link; 1018 struct ata_device *pmp_dev = pmp_link->device; 1019 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 1020 struct ata_link *link; 1021 struct ata_device *dev; 1022 unsigned int err_mask; 1023 u32 gscr_error, sntf; 1024 int cnt, rc; 1025 1026 pmp_tries = ATA_EH_PMP_TRIES; 1027 ata_port_for_each_link(link, ap) 1028 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 1029 1030 retry: 1031 /* PMP attached? */ 1032 if (!ap->nr_pmp_links) { 1033 rc = ata_eh_recover(ap, prereset, softreset, hardreset, 1034 postreset, NULL); 1035 if (rc) { 1036 ata_link_for_each_dev(dev, &ap->link) 1037 ata_dev_disable(dev); 1038 return rc; 1039 } 1040 1041 if (pmp_dev->class != ATA_DEV_PMP) 1042 return 0; 1043 1044 /* new PMP online */ 1045 ata_port_for_each_link(link, ap) 1046 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 1047 1048 /* fall through */ 1049 } 1050 1051 /* recover pmp */ 1052 rc = sata_pmp_eh_recover_pmp(ap, prereset, softreset, hardreset, 1053 postreset); 1054 if (rc) 1055 goto pmp_fail; 1056 1057 /* handle disabled links */ 1058 rc = sata_pmp_eh_handle_disabled_links(ap); 1059 if (rc) 1060 goto pmp_fail; 1061 1062 /* recover links */ 1063 rc = ata_eh_recover(ap, pmp_prereset, pmp_softreset, pmp_hardreset, 1064 pmp_postreset, &link); 1065 if (rc) 1066 goto link_fail; 1067 1068 /* Connection status might have changed while resetting other 1069 * links, check SATA_PMP_GSCR_ERROR before returning. 1070 */ 1071 1072 /* clear SNotification */ 1073 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 1074 if (rc == 0) 1075 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 1076 1077 /* enable notification */ 1078 if (pmp_dev->flags & ATA_DFLAG_AN) { 1079 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 1080 1081 err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, 1082 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); 1083 if (err_mask) { 1084 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " 1085 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 1086 rc = -EIO; 1087 goto pmp_fail; 1088 } 1089 } 1090 1091 /* check GSCR_ERROR */ 1092 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 1093 if (err_mask) { 1094 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 1095 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 1096 rc = -EIO; 1097 goto pmp_fail; 1098 } 1099 1100 cnt = 0; 1101 ata_port_for_each_link(link, ap) { 1102 if (!(gscr_error & (1 << link->pmp))) 1103 continue; 1104 1105 if (sata_pmp_handle_link_fail(link, link_tries)) { 1106 ata_ehi_hotplugged(&link->eh_context.i); 1107 cnt++; 1108 } else { 1109 ata_link_printk(link, KERN_WARNING, 1110 "PHY status changed but maxed out on retries, " 1111 "giving up\n"); 1112 ata_link_printk(link, KERN_WARNING, 1113 "Manully issue scan to resume this link\n"); 1114 } 1115 } 1116 1117 if (cnt) { 1118 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 1119 "ports, repeating recovery\n"); 1120 goto retry; 1121 } 1122 1123 return 0; 1124 1125 link_fail: 1126 if (sata_pmp_handle_link_fail(link, link_tries)) { 1127 pmp_ehc->i.action |= ATA_EH_HARDRESET; 1128 goto retry; 1129 } 1130 1131 /* fall through */ 1132 pmp_fail: 1133 /* Control always ends up here after detaching PMP. Shut up 1134 * and return if we're unloading. 1135 */ 1136 if (ap->pflags & ATA_PFLAG_UNLOADING) 1137 return rc; 1138 1139 if (!ap->nr_pmp_links) 1140 goto retry; 1141 1142 if (--pmp_tries) { 1143 ata_port_printk(ap, KERN_WARNING, 1144 "failed to recover PMP, retrying in 5 secs\n"); 1145 pmp_ehc->i.action |= ATA_EH_HARDRESET; 1146 ssleep(5); 1147 goto retry; 1148 } 1149 1150 ata_port_printk(ap, KERN_ERR, 1151 "failed to recover PMP after %d tries, giving up\n", 1152 ATA_EH_PMP_TRIES); 1153 sata_pmp_detach(pmp_dev); 1154 ata_dev_disable(pmp_dev); 1155 1156 return rc; 1157 } 1158 1159 /** 1160 * sata_pmp_do_eh - do standard error handling for PMP-enabled host 1161 * @ap: host port to handle error for 1162 * @prereset: prereset method (can be NULL) 1163 * @softreset: softreset method 1164 * @hardreset: hardreset method 1165 * @postreset: postreset method (can be NULL) 1166 * @pmp_prereset: PMP prereset method (can be NULL) 1167 * @pmp_softreset: PMP softreset method (can be NULL) 1168 * @pmp_hardreset: PMP hardreset method (can be NULL) 1169 * @pmp_postreset: PMP postreset method (can be NULL) 1170 * 1171 * Perform standard error handling sequence for PMP-enabled host 1172 * @ap. 1173 * 1174 * LOCKING: 1175 * Kernel thread context (may sleep). 1176 */ 1177 void sata_pmp_do_eh(struct ata_port *ap, 1178 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 1179 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset, 1180 ata_prereset_fn_t pmp_prereset, ata_reset_fn_t pmp_softreset, 1181 ata_reset_fn_t pmp_hardreset, ata_postreset_fn_t pmp_postreset) 1182 { 1183 ata_eh_autopsy(ap); 1184 ata_eh_report(ap); 1185 sata_pmp_eh_recover(ap, prereset, softreset, hardreset, postreset, 1186 pmp_prereset, pmp_softreset, pmp_hardreset, 1187 pmp_postreset); 1188 ata_eh_finish(ap); 1189 } 1190