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