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 const struct ata_port_operations sata_pmp_port_ops = { 15 .inherits = &sata_port_ops, 16 .pmp_prereset = ata_std_prereset, 17 .pmp_hardreset = sata_std_hardreset, 18 .pmp_postreset = ata_std_postreset, 19 .error_handler = sata_pmp_error_handler, 20 }; 21 22 /** 23 * sata_pmp_read - read PMP register 24 * @link: link to read PMP register for 25 * @reg: register to read 26 * @r_val: resulting value 27 * 28 * Read PMP register. 29 * 30 * LOCKING: 31 * Kernel thread context (may sleep). 32 * 33 * RETURNS: 34 * 0 on success, AC_ERR_* mask on failure. 35 */ 36 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 37 { 38 struct ata_port *ap = link->ap; 39 struct ata_device *pmp_dev = ap->link.device; 40 struct ata_taskfile tf; 41 unsigned int err_mask; 42 43 ata_tf_init(pmp_dev, &tf); 44 tf.command = ATA_CMD_PMP_READ; 45 tf.protocol = ATA_PROT_NODATA; 46 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 47 tf.feature = reg; 48 tf.device = link->pmp; 49 50 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 51 SATA_PMP_RW_TIMEOUT); 52 if (err_mask) 53 return err_mask; 54 55 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 56 return 0; 57 } 58 59 /** 60 * sata_pmp_write - write PMP register 61 * @link: link to write PMP register for 62 * @reg: register to write 63 * @r_val: value to write 64 * 65 * Write PMP register. 66 * 67 * LOCKING: 68 * Kernel thread context (may sleep). 69 * 70 * RETURNS: 71 * 0 on success, AC_ERR_* mask on failure. 72 */ 73 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 74 { 75 struct ata_port *ap = link->ap; 76 struct ata_device *pmp_dev = ap->link.device; 77 struct ata_taskfile tf; 78 79 ata_tf_init(pmp_dev, &tf); 80 tf.command = ATA_CMD_PMP_WRITE; 81 tf.protocol = ATA_PROT_NODATA; 82 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 83 tf.feature = reg; 84 tf.device = link->pmp; 85 tf.nsect = val & 0xff; 86 tf.lbal = (val >> 8) & 0xff; 87 tf.lbam = (val >> 16) & 0xff; 88 tf.lbah = (val >> 24) & 0xff; 89 90 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 91 SATA_PMP_RW_TIMEOUT); 92 } 93 94 /** 95 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 96 * @qc: ATA command in question 97 * 98 * A host which has command switching PMP support cannot issue 99 * commands to multiple links simultaneously. 100 * 101 * LOCKING: 102 * spin_lock_irqsave(host lock) 103 * 104 * RETURNS: 105 * ATA_DEFER_* if deferring is needed, 0 otherwise. 106 */ 107 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 108 { 109 struct ata_link *link = qc->dev->link; 110 struct ata_port *ap = link->ap; 111 112 if (ap->excl_link == NULL || ap->excl_link == link) { 113 if (ap->nr_active_links == 0 || ata_link_active(link)) { 114 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 115 return ata_std_qc_defer(qc); 116 } 117 118 ap->excl_link = link; 119 } 120 121 return ATA_DEFER_PORT; 122 } 123 124 /** 125 * sata_pmp_scr_read - read PSCR 126 * @link: ATA link to read PSCR for 127 * @reg: PSCR to read 128 * @r_val: resulting value 129 * 130 * Read PSCR @reg into @r_val for @link, to be called from 131 * ata_scr_read(). 132 * 133 * LOCKING: 134 * Kernel thread context (may sleep). 135 * 136 * RETURNS: 137 * 0 on success, -errno on failure. 138 */ 139 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 140 { 141 unsigned int err_mask; 142 143 if (reg > SATA_PMP_PSCR_CONTROL) 144 return -EINVAL; 145 146 err_mask = sata_pmp_read(link, reg, r_val); 147 if (err_mask) { 148 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " 149 "(Emask=0x%x)\n", reg, err_mask); 150 return -EIO; 151 } 152 return 0; 153 } 154 155 /** 156 * sata_pmp_scr_write - write PSCR 157 * @link: ATA link to write PSCR for 158 * @reg: PSCR to write 159 * @val: value to be written 160 * 161 * Write @val to PSCR @reg for @link, to be called from 162 * ata_scr_write() and ata_scr_write_flush(). 163 * 164 * LOCKING: 165 * Kernel thread context (may sleep). 166 * 167 * RETURNS: 168 * 0 on success, -errno on failure. 169 */ 170 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 171 { 172 unsigned int err_mask; 173 174 if (reg > SATA_PMP_PSCR_CONTROL) 175 return -EINVAL; 176 177 err_mask = sata_pmp_write(link, reg, val); 178 if (err_mask) { 179 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " 180 "(Emask=0x%x)\n", reg, err_mask); 181 return -EIO; 182 } 183 return 0; 184 } 185 186 /** 187 * sata_pmp_read_gscr - read GSCR block of SATA PMP 188 * @dev: PMP device 189 * @gscr: buffer to read GSCR block into 190 * 191 * Read selected PMP GSCRs from the PMP at @dev. This will serve 192 * as configuration and identification info for the PMP. 193 * 194 * LOCKING: 195 * Kernel thread context (may sleep). 196 * 197 * RETURNS: 198 * 0 on success, -errno on failure. 199 */ 200 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 201 { 202 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 203 int i; 204 205 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 206 int reg = gscr_to_read[i]; 207 unsigned int err_mask; 208 209 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 210 if (err_mask) { 211 ata_dev_printk(dev, KERN_ERR, "failed to read PMP " 212 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); 213 return -EIO; 214 } 215 } 216 217 return 0; 218 } 219 220 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 221 { 222 u32 rev = gscr[SATA_PMP_GSCR_REV]; 223 224 if (rev & (1 << 3)) 225 return "1.2"; 226 if (rev & (1 << 2)) 227 return "1.1"; 228 if (rev & (1 << 1)) 229 return "1.0"; 230 return "<unknown>"; 231 } 232 233 static int sata_pmp_configure(struct ata_device *dev, int print_info) 234 { 235 struct ata_port *ap = dev->link->ap; 236 u32 *gscr = dev->gscr; 237 unsigned int err_mask = 0; 238 const char *reason; 239 int nr_ports, rc; 240 241 nr_ports = sata_pmp_gscr_ports(gscr); 242 243 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 244 rc = -EINVAL; 245 reason = "invalid nr_ports"; 246 goto fail; 247 } 248 249 if ((ap->flags & ATA_FLAG_AN) && 250 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 251 dev->flags |= ATA_DFLAG_AN; 252 253 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 254 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 255 SERR_PHYRDY_CHG); 256 if (err_mask) { 257 rc = -EIO; 258 reason = "failed to write GSCR_ERROR_EN"; 259 goto fail; 260 } 261 262 if (print_info) { 263 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " 264 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 265 sata_pmp_spec_rev_str(gscr), 266 sata_pmp_gscr_vendor(gscr), 267 sata_pmp_gscr_devid(gscr), 268 sata_pmp_gscr_rev(gscr), 269 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 270 gscr[SATA_PMP_GSCR_FEAT]); 271 272 if (!(dev->flags & ATA_DFLAG_AN)) 273 ata_dev_printk(dev, KERN_INFO, 274 "Asynchronous notification not supported, " 275 "hotplug won't\n work on fan-out " 276 "ports. Use warm-plug instead.\n"); 277 } 278 279 return 0; 280 281 fail: 282 ata_dev_printk(dev, KERN_ERR, 283 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 284 reason, err_mask); 285 return rc; 286 } 287 288 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) 289 { 290 struct ata_link *pmp_link = ap->pmp_link; 291 int i; 292 293 if (!pmp_link) { 294 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 295 GFP_NOIO); 296 if (!pmp_link) 297 return -ENOMEM; 298 299 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 300 ata_link_init(ap, &pmp_link[i], i); 301 302 ap->pmp_link = pmp_link; 303 } 304 305 for (i = 0; i < nr_ports; i++) { 306 struct ata_link *link = &pmp_link[i]; 307 struct ata_eh_context *ehc = &link->eh_context; 308 309 link->flags = 0; 310 ehc->i.probe_mask |= ATA_ALL_DEVICES; 311 ehc->i.action |= ATA_EH_RESET; 312 } 313 314 return 0; 315 } 316 317 static void sata_pmp_quirks(struct ata_port *ap) 318 { 319 u32 *gscr = ap->link.device->gscr; 320 u16 vendor = sata_pmp_gscr_vendor(gscr); 321 u16 devid = sata_pmp_gscr_devid(gscr); 322 struct ata_link *link; 323 324 if (vendor == 0x1095 && devid == 0x3726) { 325 /* sil3726 quirks */ 326 ata_for_each_link(link, ap, EDGE) { 327 /* Class code report is unreliable and SRST 328 * times out under certain configurations. 329 */ 330 if (link->pmp < 5) 331 link->flags |= ATA_LFLAG_NO_SRST | 332 ATA_LFLAG_ASSUME_ATA; 333 334 /* port 5 is for SEMB device and it doesn't like SRST */ 335 if (link->pmp == 5) 336 link->flags |= ATA_LFLAG_NO_SRST | 337 ATA_LFLAG_ASSUME_SEMB; 338 } 339 } else if (vendor == 0x1095 && devid == 0x4723) { 340 /* sil4723 quirks */ 341 ata_for_each_link(link, ap, EDGE) { 342 /* class code report is unreliable */ 343 if (link->pmp < 2) 344 link->flags |= ATA_LFLAG_ASSUME_ATA; 345 346 /* the config device at port 2 locks up on SRST */ 347 if (link->pmp == 2) 348 link->flags |= ATA_LFLAG_NO_SRST | 349 ATA_LFLAG_ASSUME_ATA; 350 } 351 } else if (vendor == 0x1095 && devid == 0x4726) { 352 /* sil4726 quirks */ 353 ata_for_each_link(link, ap, EDGE) { 354 /* Class code report is unreliable and SRST 355 * times out under certain configurations. 356 * Config device can be at port 0 or 5 and 357 * locks up on SRST. 358 */ 359 if (link->pmp <= 5) 360 link->flags |= ATA_LFLAG_NO_SRST | 361 ATA_LFLAG_ASSUME_ATA; 362 363 /* Port 6 is for SEMB device which doesn't 364 * like SRST either. 365 */ 366 if (link->pmp == 6) 367 link->flags |= ATA_LFLAG_NO_SRST | 368 ATA_LFLAG_ASSUME_SEMB; 369 } 370 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 371 devid == 0x5734 || devid == 0x5744)) { 372 /* sil5723/5744 quirks */ 373 374 /* sil5723/5744 has either two or three downstream 375 * ports depending on operation mode. The last port 376 * is empty if any actual IO device is available or 377 * occupied by a pseudo configuration device 378 * otherwise. Don't try hard to recover it. 379 */ 380 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 381 } 382 } 383 384 /** 385 * sata_pmp_attach - attach a SATA PMP device 386 * @dev: SATA PMP device to attach 387 * 388 * Configure and attach SATA PMP device @dev. This function is 389 * also responsible for allocating and initializing PMP links. 390 * 391 * LOCKING: 392 * Kernel thread context (may sleep). 393 * 394 * RETURNS: 395 * 0 on success, -errno on failure. 396 */ 397 int sata_pmp_attach(struct ata_device *dev) 398 { 399 struct ata_link *link = dev->link; 400 struct ata_port *ap = link->ap; 401 unsigned long flags; 402 struct ata_link *tlink; 403 int rc; 404 405 /* is it hanging off the right place? */ 406 if (!sata_pmp_supported(ap)) { 407 ata_dev_printk(dev, KERN_ERR, 408 "host does not support Port Multiplier\n"); 409 return -EINVAL; 410 } 411 412 if (!ata_is_host_link(link)) { 413 ata_dev_printk(dev, KERN_ERR, 414 "Port Multipliers cannot be nested\n"); 415 return -EINVAL; 416 } 417 418 if (dev->devno) { 419 ata_dev_printk(dev, KERN_ERR, 420 "Port Multiplier must be the first device\n"); 421 return -EINVAL; 422 } 423 424 WARN_ON(link->pmp != 0); 425 link->pmp = SATA_PMP_CTRL_PORT; 426 427 /* read GSCR block */ 428 rc = sata_pmp_read_gscr(dev, dev->gscr); 429 if (rc) 430 goto fail; 431 432 /* config PMP */ 433 rc = sata_pmp_configure(dev, 1); 434 if (rc) 435 goto fail; 436 437 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 438 if (rc) { 439 ata_dev_printk(dev, KERN_INFO, 440 "failed to initialize PMP links\n"); 441 goto fail; 442 } 443 444 /* attach it */ 445 spin_lock_irqsave(ap->lock, flags); 446 WARN_ON(ap->nr_pmp_links); 447 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 448 spin_unlock_irqrestore(ap->lock, flags); 449 450 sata_pmp_quirks(ap); 451 452 if (ap->ops->pmp_attach) 453 ap->ops->pmp_attach(ap); 454 455 ata_for_each_link(tlink, ap, EDGE) 456 sata_link_init_spd(tlink); 457 458 ata_acpi_associate_sata_port(ap); 459 460 return 0; 461 462 fail: 463 link->pmp = 0; 464 return rc; 465 } 466 467 /** 468 * sata_pmp_detach - detach a SATA PMP device 469 * @dev: SATA PMP device to detach 470 * 471 * Detach SATA PMP device @dev. This function is also 472 * responsible for deconfiguring PMP links. 473 * 474 * LOCKING: 475 * Kernel thread context (may sleep). 476 */ 477 static void sata_pmp_detach(struct ata_device *dev) 478 { 479 struct ata_link *link = dev->link; 480 struct ata_port *ap = link->ap; 481 struct ata_link *tlink; 482 unsigned long flags; 483 484 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 485 486 WARN_ON(!ata_is_host_link(link) || dev->devno || 487 link->pmp != SATA_PMP_CTRL_PORT); 488 489 if (ap->ops->pmp_detach) 490 ap->ops->pmp_detach(ap); 491 492 ata_for_each_link(tlink, ap, EDGE) 493 ata_eh_detach_dev(tlink->device); 494 495 spin_lock_irqsave(ap->lock, flags); 496 ap->nr_pmp_links = 0; 497 link->pmp = 0; 498 spin_unlock_irqrestore(ap->lock, flags); 499 500 ata_acpi_associate_sata_port(ap); 501 } 502 503 /** 504 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 505 * @dev: PMP device to compare against 506 * @new_gscr: GSCR block of the new device 507 * 508 * Compare @new_gscr against @dev and determine whether @dev is 509 * the PMP described by @new_gscr. 510 * 511 * LOCKING: 512 * None. 513 * 514 * RETURNS: 515 * 1 if @dev matches @new_gscr, 0 otherwise. 516 */ 517 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 518 { 519 const u32 *old_gscr = dev->gscr; 520 u16 old_vendor, new_vendor, old_devid, new_devid; 521 int old_nr_ports, new_nr_ports; 522 523 old_vendor = sata_pmp_gscr_vendor(old_gscr); 524 new_vendor = sata_pmp_gscr_vendor(new_gscr); 525 old_devid = sata_pmp_gscr_devid(old_gscr); 526 new_devid = sata_pmp_gscr_devid(new_gscr); 527 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 528 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 529 530 if (old_vendor != new_vendor) { 531 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 532 "vendor mismatch '0x%x' != '0x%x'\n", 533 old_vendor, new_vendor); 534 return 0; 535 } 536 537 if (old_devid != new_devid) { 538 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 539 "device ID mismatch '0x%x' != '0x%x'\n", 540 old_devid, new_devid); 541 return 0; 542 } 543 544 if (old_nr_ports != new_nr_ports) { 545 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 546 "nr_ports mismatch '0x%x' != '0x%x'\n", 547 old_nr_ports, new_nr_ports); 548 return 0; 549 } 550 551 return 1; 552 } 553 554 /** 555 * sata_pmp_revalidate - revalidate SATA PMP 556 * @dev: PMP device to revalidate 557 * @new_class: new class code 558 * 559 * Re-read GSCR block and make sure @dev is still attached to the 560 * port and properly configured. 561 * 562 * LOCKING: 563 * Kernel thread context (may sleep). 564 * 565 * RETURNS: 566 * 0 on success, -errno otherwise. 567 */ 568 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 569 { 570 struct ata_link *link = dev->link; 571 struct ata_port *ap = link->ap; 572 u32 *gscr = (void *)ap->sector_buf; 573 int rc; 574 575 DPRINTK("ENTER\n"); 576 577 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 578 579 if (!ata_dev_enabled(dev)) { 580 rc = -ENODEV; 581 goto fail; 582 } 583 584 /* wrong class? */ 585 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 586 rc = -ENODEV; 587 goto fail; 588 } 589 590 /* read GSCR */ 591 rc = sata_pmp_read_gscr(dev, gscr); 592 if (rc) 593 goto fail; 594 595 /* is the pmp still there? */ 596 if (!sata_pmp_same_pmp(dev, gscr)) { 597 rc = -ENODEV; 598 goto fail; 599 } 600 601 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 602 603 rc = sata_pmp_configure(dev, 0); 604 if (rc) 605 goto fail; 606 607 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 608 609 DPRINTK("EXIT, rc=0\n"); 610 return 0; 611 612 fail: 613 ata_dev_printk(dev, KERN_ERR, 614 "PMP revalidation failed (errno=%d)\n", rc); 615 DPRINTK("EXIT, rc=%d\n", rc); 616 return rc; 617 } 618 619 /** 620 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 621 * @dev: PMP device to revalidate 622 * 623 * Make sure the attached PMP is accessible. 624 * 625 * LOCKING: 626 * Kernel thread context (may sleep). 627 * 628 * RETURNS: 629 * 0 on success, -errno otherwise. 630 */ 631 static int sata_pmp_revalidate_quick(struct ata_device *dev) 632 { 633 unsigned int err_mask; 634 u32 prod_id; 635 636 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 637 if (err_mask) { 638 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 639 "(Emask=0x%x)\n", err_mask); 640 return -EIO; 641 } 642 643 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 644 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); 645 /* something weird is going on, request full PMP recovery */ 646 return -EIO; 647 } 648 649 return 0; 650 } 651 652 /** 653 * sata_pmp_eh_recover_pmp - recover PMP 654 * @ap: ATA port PMP is attached to 655 * @prereset: prereset method (can be NULL) 656 * @softreset: softreset method 657 * @hardreset: hardreset method 658 * @postreset: postreset method (can be NULL) 659 * 660 * Recover PMP attached to @ap. Recovery procedure is somewhat 661 * similar to that of ata_eh_recover() except that reset should 662 * always be performed in hard->soft sequence and recovery 663 * failure results in PMP detachment. 664 * 665 * LOCKING: 666 * Kernel thread context (may sleep). 667 * 668 * RETURNS: 669 * 0 on success, -errno on failure. 670 */ 671 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 672 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 673 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 674 { 675 struct ata_link *link = &ap->link; 676 struct ata_eh_context *ehc = &link->eh_context; 677 struct ata_device *dev = link->device; 678 int tries = ATA_EH_PMP_TRIES; 679 int detach = 0, rc = 0; 680 int reval_failed = 0; 681 682 DPRINTK("ENTER\n"); 683 684 if (dev->flags & ATA_DFLAG_DETACH) { 685 detach = 1; 686 goto fail; 687 } 688 689 retry: 690 ehc->classes[0] = ATA_DEV_UNKNOWN; 691 692 if (ehc->i.action & ATA_EH_RESET) { 693 struct ata_link *tlink; 694 695 /* reset */ 696 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 697 postreset); 698 if (rc) { 699 ata_link_printk(link, KERN_ERR, 700 "failed to reset PMP, giving up\n"); 701 goto fail; 702 } 703 704 /* PMP is reset, SErrors cannot be trusted, scan all */ 705 ata_for_each_link(tlink, ap, EDGE) { 706 struct ata_eh_context *ehc = &tlink->eh_context; 707 708 ehc->i.probe_mask |= ATA_ALL_DEVICES; 709 ehc->i.action |= ATA_EH_RESET; 710 } 711 } 712 713 /* If revalidation is requested, revalidate and reconfigure; 714 * otherwise, do quick revalidation. 715 */ 716 if (ehc->i.action & ATA_EH_REVALIDATE) 717 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 718 else 719 rc = sata_pmp_revalidate_quick(dev); 720 721 if (rc) { 722 tries--; 723 724 if (rc == -ENODEV) { 725 ehc->i.probe_mask |= ATA_ALL_DEVICES; 726 detach = 1; 727 /* give it just two more chances */ 728 tries = min(tries, 2); 729 } 730 731 if (tries) { 732 /* consecutive revalidation failures? speed down */ 733 if (reval_failed) 734 sata_down_spd_limit(link, 0); 735 else 736 reval_failed = 1; 737 738 ehc->i.action |= ATA_EH_RESET; 739 goto retry; 740 } else { 741 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 742 "after %d tries, giving up\n", 743 ATA_EH_PMP_TRIES); 744 goto fail; 745 } 746 } 747 748 /* okay, PMP resurrected */ 749 ehc->i.flags = 0; 750 751 DPRINTK("EXIT, rc=0\n"); 752 return 0; 753 754 fail: 755 sata_pmp_detach(dev); 756 if (detach) 757 ata_eh_detach_dev(dev); 758 else 759 ata_dev_disable(dev); 760 761 DPRINTK("EXIT, rc=%d\n", rc); 762 return rc; 763 } 764 765 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 766 { 767 struct ata_link *link; 768 unsigned long flags; 769 int rc; 770 771 spin_lock_irqsave(ap->lock, flags); 772 773 ata_for_each_link(link, ap, EDGE) { 774 if (!(link->flags & ATA_LFLAG_DISABLED)) 775 continue; 776 777 spin_unlock_irqrestore(ap->lock, flags); 778 779 /* Some PMPs require hardreset sequence to get 780 * SError.N working. 781 */ 782 sata_link_hardreset(link, sata_deb_timing_normal, 783 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 784 NULL, NULL); 785 786 /* unconditionally clear SError.N */ 787 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 788 if (rc) { 789 ata_link_printk(link, KERN_ERR, "failed to clear " 790 "SError.N (errno=%d)\n", rc); 791 return rc; 792 } 793 794 spin_lock_irqsave(ap->lock, flags); 795 } 796 797 spin_unlock_irqrestore(ap->lock, flags); 798 799 return 0; 800 } 801 802 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 803 { 804 struct ata_port *ap = link->ap; 805 unsigned long flags; 806 807 if (link_tries[link->pmp] && --link_tries[link->pmp]) 808 return 1; 809 810 /* disable this link */ 811 if (!(link->flags & ATA_LFLAG_DISABLED)) { 812 ata_link_printk(link, KERN_WARNING, 813 "failed to recover link after %d tries, disabling\n", 814 ATA_EH_PMP_LINK_TRIES); 815 816 spin_lock_irqsave(ap->lock, flags); 817 link->flags |= ATA_LFLAG_DISABLED; 818 spin_unlock_irqrestore(ap->lock, flags); 819 } 820 821 ata_dev_disable(link->device); 822 link->eh_context.i.action = 0; 823 824 return 0; 825 } 826 827 /** 828 * sata_pmp_eh_recover - recover PMP-enabled port 829 * @ap: ATA port to recover 830 * 831 * Drive EH recovery operation for PMP enabled port @ap. This 832 * function recovers host and PMP ports with proper retrials and 833 * fallbacks. Actual recovery operations are performed using 834 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 835 * 836 * LOCKING: 837 * Kernel thread context (may sleep). 838 * 839 * RETURNS: 840 * 0 on success, -errno on failure. 841 */ 842 static int sata_pmp_eh_recover(struct ata_port *ap) 843 { 844 struct ata_port_operations *ops = ap->ops; 845 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 846 struct ata_link *pmp_link = &ap->link; 847 struct ata_device *pmp_dev = pmp_link->device; 848 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 849 u32 *gscr = pmp_dev->gscr; 850 struct ata_link *link; 851 struct ata_device *dev; 852 unsigned int err_mask; 853 u32 gscr_error, sntf; 854 int cnt, rc; 855 856 pmp_tries = ATA_EH_PMP_TRIES; 857 ata_for_each_link(link, ap, EDGE) 858 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 859 860 retry: 861 /* PMP attached? */ 862 if (!sata_pmp_attached(ap)) { 863 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 864 ops->hardreset, ops->postreset, NULL); 865 if (rc) { 866 ata_for_each_dev(dev, &ap->link, ALL) 867 ata_dev_disable(dev); 868 return rc; 869 } 870 871 if (pmp_dev->class != ATA_DEV_PMP) 872 return 0; 873 874 /* new PMP online */ 875 ata_for_each_link(link, ap, EDGE) 876 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 877 878 /* fall through */ 879 } 880 881 /* recover pmp */ 882 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 883 ops->hardreset, ops->postreset); 884 if (rc) 885 goto pmp_fail; 886 887 /* PHY event notification can disturb reset and other recovery 888 * operations. Turn it off. 889 */ 890 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 891 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 892 893 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 894 gscr[SATA_PMP_GSCR_FEAT_EN]); 895 if (err_mask) { 896 ata_link_printk(pmp_link, KERN_WARNING, 897 "failed to disable NOTIFY (err_mask=0x%x)\n", 898 err_mask); 899 goto pmp_fail; 900 } 901 } 902 903 /* handle disabled links */ 904 rc = sata_pmp_eh_handle_disabled_links(ap); 905 if (rc) 906 goto pmp_fail; 907 908 /* recover links */ 909 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 910 ops->pmp_hardreset, ops->pmp_postreset, &link); 911 if (rc) 912 goto link_fail; 913 914 /* Connection status might have changed while resetting other 915 * links, check SATA_PMP_GSCR_ERROR before returning. 916 */ 917 918 /* clear SNotification */ 919 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 920 if (rc == 0) 921 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 922 923 /* enable notification */ 924 if (pmp_dev->flags & ATA_DFLAG_AN) { 925 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 926 927 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 928 gscr[SATA_PMP_GSCR_FEAT_EN]); 929 if (err_mask) { 930 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " 931 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 932 rc = -EIO; 933 goto pmp_fail; 934 } 935 } 936 937 /* check GSCR_ERROR */ 938 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 939 if (err_mask) { 940 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 941 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 942 rc = -EIO; 943 goto pmp_fail; 944 } 945 946 cnt = 0; 947 ata_for_each_link(link, ap, EDGE) { 948 if (!(gscr_error & (1 << link->pmp))) 949 continue; 950 951 if (sata_pmp_handle_link_fail(link, link_tries)) { 952 ata_ehi_hotplugged(&link->eh_context.i); 953 cnt++; 954 } else { 955 ata_link_printk(link, KERN_WARNING, 956 "PHY status changed but maxed out on retries, " 957 "giving up\n"); 958 ata_link_printk(link, KERN_WARNING, 959 "Manully issue scan to resume this link\n"); 960 } 961 } 962 963 if (cnt) { 964 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 965 "ports, repeating recovery\n"); 966 goto retry; 967 } 968 969 return 0; 970 971 link_fail: 972 if (sata_pmp_handle_link_fail(link, link_tries)) { 973 pmp_ehc->i.action |= ATA_EH_RESET; 974 goto retry; 975 } 976 977 /* fall through */ 978 pmp_fail: 979 /* Control always ends up here after detaching PMP. Shut up 980 * and return if we're unloading. 981 */ 982 if (ap->pflags & ATA_PFLAG_UNLOADING) 983 return rc; 984 985 if (!sata_pmp_attached(ap)) 986 goto retry; 987 988 if (--pmp_tries) { 989 pmp_ehc->i.action |= ATA_EH_RESET; 990 goto retry; 991 } 992 993 ata_port_printk(ap, KERN_ERR, 994 "failed to recover PMP after %d tries, giving up\n", 995 ATA_EH_PMP_TRIES); 996 sata_pmp_detach(pmp_dev); 997 ata_dev_disable(pmp_dev); 998 999 return rc; 1000 } 1001 1002 /** 1003 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1004 * @ap: host port to handle error for 1005 * 1006 * Perform standard error handling sequence for PMP-enabled host 1007 * @ap. 1008 * 1009 * LOCKING: 1010 * Kernel thread context (may sleep). 1011 */ 1012 void sata_pmp_error_handler(struct ata_port *ap) 1013 { 1014 ata_eh_autopsy(ap); 1015 ata_eh_report(ap); 1016 sata_pmp_eh_recover(ap); 1017 ata_eh_finish(ap); 1018 } 1019 1020 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1021 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1022 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1023