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 15 const struct ata_port_operations sata_pmp_port_ops = { 16 .inherits = &sata_port_ops, 17 .pmp_prereset = ata_std_prereset, 18 .pmp_hardreset = sata_std_hardreset, 19 .pmp_postreset = ata_std_postreset, 20 .error_handler = sata_pmp_error_handler, 21 }; 22 23 /** 24 * sata_pmp_read - read PMP register 25 * @link: link to read PMP register for 26 * @reg: register to read 27 * @r_val: resulting value 28 * 29 * Read PMP register. 30 * 31 * LOCKING: 32 * Kernel thread context (may sleep). 33 * 34 * RETURNS: 35 * 0 on success, AC_ERR_* mask on failure. 36 */ 37 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val) 38 { 39 struct ata_port *ap = link->ap; 40 struct ata_device *pmp_dev = ap->link.device; 41 struct ata_taskfile tf; 42 unsigned int err_mask; 43 44 ata_tf_init(pmp_dev, &tf); 45 tf.command = ATA_CMD_PMP_READ; 46 tf.protocol = ATA_PROT_NODATA; 47 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 48 tf.feature = reg; 49 tf.device = link->pmp; 50 51 err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 52 SATA_PMP_RW_TIMEOUT); 53 if (err_mask) 54 return err_mask; 55 56 *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24; 57 return 0; 58 } 59 60 /** 61 * sata_pmp_write - write PMP register 62 * @link: link to write PMP register for 63 * @reg: register to write 64 * @r_val: value to write 65 * 66 * Write PMP register. 67 * 68 * LOCKING: 69 * Kernel thread context (may sleep). 70 * 71 * RETURNS: 72 * 0 on success, AC_ERR_* mask on failure. 73 */ 74 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val) 75 { 76 struct ata_port *ap = link->ap; 77 struct ata_device *pmp_dev = ap->link.device; 78 struct ata_taskfile tf; 79 80 ata_tf_init(pmp_dev, &tf); 81 tf.command = ATA_CMD_PMP_WRITE; 82 tf.protocol = ATA_PROT_NODATA; 83 tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; 84 tf.feature = reg; 85 tf.device = link->pmp; 86 tf.nsect = val & 0xff; 87 tf.lbal = (val >> 8) & 0xff; 88 tf.lbam = (val >> 16) & 0xff; 89 tf.lbah = (val >> 24) & 0xff; 90 91 return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0, 92 SATA_PMP_RW_TIMEOUT); 93 } 94 95 /** 96 * sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP 97 * @qc: ATA command in question 98 * 99 * A host which has command switching PMP support cannot issue 100 * commands to multiple links simultaneously. 101 * 102 * LOCKING: 103 * spin_lock_irqsave(host lock) 104 * 105 * RETURNS: 106 * ATA_DEFER_* if deferring is needed, 0 otherwise. 107 */ 108 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc) 109 { 110 struct ata_link *link = qc->dev->link; 111 struct ata_port *ap = link->ap; 112 113 if (ap->excl_link == NULL || ap->excl_link == link) { 114 if (ap->nr_active_links == 0 || ata_link_active(link)) { 115 qc->flags |= ATA_QCFLAG_CLEAR_EXCL; 116 return ata_std_qc_defer(qc); 117 } 118 119 ap->excl_link = link; 120 } 121 122 return ATA_DEFER_PORT; 123 } 124 125 /** 126 * sata_pmp_scr_read - read PSCR 127 * @link: ATA link to read PSCR for 128 * @reg: PSCR to read 129 * @r_val: resulting value 130 * 131 * Read PSCR @reg into @r_val for @link, to be called from 132 * ata_scr_read(). 133 * 134 * LOCKING: 135 * Kernel thread context (may sleep). 136 * 137 * RETURNS: 138 * 0 on success, -errno on failure. 139 */ 140 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val) 141 { 142 unsigned int err_mask; 143 144 if (reg > SATA_PMP_PSCR_CONTROL) 145 return -EINVAL; 146 147 err_mask = sata_pmp_read(link, reg, r_val); 148 if (err_mask) { 149 ata_link_printk(link, KERN_WARNING, "failed to read SCR %d " 150 "(Emask=0x%x)\n", reg, err_mask); 151 return -EIO; 152 } 153 return 0; 154 } 155 156 /** 157 * sata_pmp_scr_write - write PSCR 158 * @link: ATA link to write PSCR for 159 * @reg: PSCR to write 160 * @val: value to be written 161 * 162 * Write @val to PSCR @reg for @link, to be called from 163 * ata_scr_write() and ata_scr_write_flush(). 164 * 165 * LOCKING: 166 * Kernel thread context (may sleep). 167 * 168 * RETURNS: 169 * 0 on success, -errno on failure. 170 */ 171 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val) 172 { 173 unsigned int err_mask; 174 175 if (reg > SATA_PMP_PSCR_CONTROL) 176 return -EINVAL; 177 178 err_mask = sata_pmp_write(link, reg, val); 179 if (err_mask) { 180 ata_link_printk(link, KERN_WARNING, "failed to write SCR %d " 181 "(Emask=0x%x)\n", reg, err_mask); 182 return -EIO; 183 } 184 return 0; 185 } 186 187 /** 188 * sata_pmp_read_gscr - read GSCR block of SATA PMP 189 * @dev: PMP device 190 * @gscr: buffer to read GSCR block into 191 * 192 * Read selected PMP GSCRs from the PMP at @dev. This will serve 193 * as configuration and identification info for the PMP. 194 * 195 * LOCKING: 196 * Kernel thread context (may sleep). 197 * 198 * RETURNS: 199 * 0 on success, -errno on failure. 200 */ 201 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr) 202 { 203 static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 }; 204 int i; 205 206 for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) { 207 int reg = gscr_to_read[i]; 208 unsigned int err_mask; 209 210 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]); 211 if (err_mask) { 212 ata_dev_printk(dev, KERN_ERR, "failed to read PMP " 213 "GSCR[%d] (Emask=0x%x)\n", reg, err_mask); 214 return -EIO; 215 } 216 } 217 218 return 0; 219 } 220 221 static const char *sata_pmp_spec_rev_str(const u32 *gscr) 222 { 223 u32 rev = gscr[SATA_PMP_GSCR_REV]; 224 225 if (rev & (1 << 3)) 226 return "1.2"; 227 if (rev & (1 << 2)) 228 return "1.1"; 229 if (rev & (1 << 1)) 230 return "1.0"; 231 return "<unknown>"; 232 } 233 234 static int sata_pmp_configure(struct ata_device *dev, int print_info) 235 { 236 struct ata_port *ap = dev->link->ap; 237 u32 *gscr = dev->gscr; 238 unsigned int err_mask = 0; 239 const char *reason; 240 int nr_ports, rc; 241 242 nr_ports = sata_pmp_gscr_ports(gscr); 243 244 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 245 rc = -EINVAL; 246 reason = "invalid nr_ports"; 247 goto fail; 248 } 249 250 if ((ap->flags & ATA_FLAG_AN) && 251 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 252 dev->flags |= ATA_DFLAG_AN; 253 254 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 255 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 256 SERR_PHYRDY_CHG); 257 if (err_mask) { 258 rc = -EIO; 259 reason = "failed to write GSCR_ERROR_EN"; 260 goto fail; 261 } 262 263 if (print_info) { 264 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " 265 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 266 sata_pmp_spec_rev_str(gscr), 267 sata_pmp_gscr_vendor(gscr), 268 sata_pmp_gscr_devid(gscr), 269 sata_pmp_gscr_rev(gscr), 270 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 271 gscr[SATA_PMP_GSCR_FEAT]); 272 273 if (!(dev->flags & ATA_DFLAG_AN)) 274 ata_dev_printk(dev, KERN_INFO, 275 "Asynchronous notification not supported, " 276 "hotplug won't\n work on fan-out " 277 "ports. Use warm-plug instead.\n"); 278 } 279 280 return 0; 281 282 fail: 283 ata_dev_printk(dev, KERN_ERR, 284 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 285 reason, err_mask); 286 return rc; 287 } 288 289 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) 290 { 291 struct ata_link *pmp_link = ap->pmp_link; 292 int i; 293 294 if (!pmp_link) { 295 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 296 GFP_NOIO); 297 if (!pmp_link) 298 return -ENOMEM; 299 300 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 301 ata_link_init(ap, &pmp_link[i], i); 302 303 ap->pmp_link = pmp_link; 304 } 305 306 for (i = 0; i < nr_ports; i++) { 307 struct ata_link *link = &pmp_link[i]; 308 struct ata_eh_context *ehc = &link->eh_context; 309 310 link->flags = 0; 311 ehc->i.probe_mask |= ATA_ALL_DEVICES; 312 ehc->i.action |= ATA_EH_RESET; 313 } 314 315 return 0; 316 } 317 318 static void sata_pmp_quirks(struct ata_port *ap) 319 { 320 u32 *gscr = ap->link.device->gscr; 321 u16 vendor = sata_pmp_gscr_vendor(gscr); 322 u16 devid = sata_pmp_gscr_devid(gscr); 323 struct ata_link *link; 324 325 if (vendor == 0x1095 && devid == 0x3726) { 326 /* sil3726 quirks */ 327 ata_for_each_link(link, ap, EDGE) { 328 /* Class code report is unreliable and SRST 329 * times out under certain configurations. 330 */ 331 if (link->pmp < 5) 332 link->flags |= ATA_LFLAG_NO_SRST | 333 ATA_LFLAG_ASSUME_ATA; 334 335 /* port 5 is for SEMB device and it doesn't like SRST */ 336 if (link->pmp == 5) 337 link->flags |= ATA_LFLAG_NO_SRST | 338 ATA_LFLAG_ASSUME_SEMB; 339 } 340 } else if (vendor == 0x1095 && devid == 0x4723) { 341 /* sil4723 quirks */ 342 ata_for_each_link(link, ap, EDGE) { 343 /* class code report is unreliable */ 344 if (link->pmp < 2) 345 link->flags |= ATA_LFLAG_ASSUME_ATA; 346 347 /* the config device at port 2 locks up on SRST */ 348 if (link->pmp == 2) 349 link->flags |= ATA_LFLAG_NO_SRST | 350 ATA_LFLAG_ASSUME_ATA; 351 } 352 } else if (vendor == 0x1095 && devid == 0x4726) { 353 /* sil4726 quirks */ 354 ata_for_each_link(link, ap, EDGE) { 355 /* Class code report is unreliable and SRST 356 * times out under certain configurations. 357 * Config device can be at port 0 or 5 and 358 * locks up on SRST. 359 */ 360 if (link->pmp <= 5) 361 link->flags |= ATA_LFLAG_NO_SRST | 362 ATA_LFLAG_ASSUME_ATA; 363 364 /* Port 6 is for SEMB device which doesn't 365 * like SRST either. 366 */ 367 if (link->pmp == 6) 368 link->flags |= ATA_LFLAG_NO_SRST | 369 ATA_LFLAG_ASSUME_SEMB; 370 } 371 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 372 devid == 0x5734 || devid == 0x5744)) { 373 /* sil5723/5744 quirks */ 374 375 /* sil5723/5744 has either two or three downstream 376 * ports depending on operation mode. The last port 377 * is empty if any actual IO device is available or 378 * occupied by a pseudo configuration device 379 * otherwise. Don't try hard to recover it. 380 */ 381 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 382 } 383 } 384 385 /** 386 * sata_pmp_attach - attach a SATA PMP device 387 * @dev: SATA PMP device to attach 388 * 389 * Configure and attach SATA PMP device @dev. This function is 390 * also responsible for allocating and initializing PMP links. 391 * 392 * LOCKING: 393 * Kernel thread context (may sleep). 394 * 395 * RETURNS: 396 * 0 on success, -errno on failure. 397 */ 398 int sata_pmp_attach(struct ata_device *dev) 399 { 400 struct ata_link *link = dev->link; 401 struct ata_port *ap = link->ap; 402 unsigned long flags; 403 struct ata_link *tlink; 404 int rc; 405 406 /* is it hanging off the right place? */ 407 if (!sata_pmp_supported(ap)) { 408 ata_dev_printk(dev, KERN_ERR, 409 "host does not support Port Multiplier\n"); 410 return -EINVAL; 411 } 412 413 if (!ata_is_host_link(link)) { 414 ata_dev_printk(dev, KERN_ERR, 415 "Port Multipliers cannot be nested\n"); 416 return -EINVAL; 417 } 418 419 if (dev->devno) { 420 ata_dev_printk(dev, KERN_ERR, 421 "Port Multiplier must be the first device\n"); 422 return -EINVAL; 423 } 424 425 WARN_ON(link->pmp != 0); 426 link->pmp = SATA_PMP_CTRL_PORT; 427 428 /* read GSCR block */ 429 rc = sata_pmp_read_gscr(dev, dev->gscr); 430 if (rc) 431 goto fail; 432 433 /* config PMP */ 434 rc = sata_pmp_configure(dev, 1); 435 if (rc) 436 goto fail; 437 438 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 439 if (rc) { 440 ata_dev_printk(dev, KERN_INFO, 441 "failed to initialize PMP links\n"); 442 goto fail; 443 } 444 445 /* attach it */ 446 spin_lock_irqsave(ap->lock, flags); 447 WARN_ON(ap->nr_pmp_links); 448 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 449 spin_unlock_irqrestore(ap->lock, flags); 450 451 sata_pmp_quirks(ap); 452 453 if (ap->ops->pmp_attach) 454 ap->ops->pmp_attach(ap); 455 456 ata_for_each_link(tlink, ap, EDGE) 457 sata_link_init_spd(tlink); 458 459 ata_acpi_associate_sata_port(ap); 460 461 return 0; 462 463 fail: 464 link->pmp = 0; 465 return rc; 466 } 467 468 /** 469 * sata_pmp_detach - detach a SATA PMP device 470 * @dev: SATA PMP device to detach 471 * 472 * Detach SATA PMP device @dev. This function is also 473 * responsible for deconfiguring PMP links. 474 * 475 * LOCKING: 476 * Kernel thread context (may sleep). 477 */ 478 static void sata_pmp_detach(struct ata_device *dev) 479 { 480 struct ata_link *link = dev->link; 481 struct ata_port *ap = link->ap; 482 struct ata_link *tlink; 483 unsigned long flags; 484 485 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 486 487 WARN_ON(!ata_is_host_link(link) || dev->devno || 488 link->pmp != SATA_PMP_CTRL_PORT); 489 490 if (ap->ops->pmp_detach) 491 ap->ops->pmp_detach(ap); 492 493 ata_for_each_link(tlink, ap, EDGE) 494 ata_eh_detach_dev(tlink->device); 495 496 spin_lock_irqsave(ap->lock, flags); 497 ap->nr_pmp_links = 0; 498 link->pmp = 0; 499 spin_unlock_irqrestore(ap->lock, flags); 500 501 ata_acpi_associate_sata_port(ap); 502 } 503 504 /** 505 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 506 * @dev: PMP device to compare against 507 * @new_gscr: GSCR block of the new device 508 * 509 * Compare @new_gscr against @dev and determine whether @dev is 510 * the PMP described by @new_gscr. 511 * 512 * LOCKING: 513 * None. 514 * 515 * RETURNS: 516 * 1 if @dev matches @new_gscr, 0 otherwise. 517 */ 518 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 519 { 520 const u32 *old_gscr = dev->gscr; 521 u16 old_vendor, new_vendor, old_devid, new_devid; 522 int old_nr_ports, new_nr_ports; 523 524 old_vendor = sata_pmp_gscr_vendor(old_gscr); 525 new_vendor = sata_pmp_gscr_vendor(new_gscr); 526 old_devid = sata_pmp_gscr_devid(old_gscr); 527 new_devid = sata_pmp_gscr_devid(new_gscr); 528 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 529 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 530 531 if (old_vendor != new_vendor) { 532 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 533 "vendor mismatch '0x%x' != '0x%x'\n", 534 old_vendor, new_vendor); 535 return 0; 536 } 537 538 if (old_devid != new_devid) { 539 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 540 "device ID mismatch '0x%x' != '0x%x'\n", 541 old_devid, new_devid); 542 return 0; 543 } 544 545 if (old_nr_ports != new_nr_ports) { 546 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 547 "nr_ports mismatch '0x%x' != '0x%x'\n", 548 old_nr_ports, new_nr_ports); 549 return 0; 550 } 551 552 return 1; 553 } 554 555 /** 556 * sata_pmp_revalidate - revalidate SATA PMP 557 * @dev: PMP device to revalidate 558 * @new_class: new class code 559 * 560 * Re-read GSCR block and make sure @dev is still attached to the 561 * port and properly configured. 562 * 563 * LOCKING: 564 * Kernel thread context (may sleep). 565 * 566 * RETURNS: 567 * 0 on success, -errno otherwise. 568 */ 569 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 570 { 571 struct ata_link *link = dev->link; 572 struct ata_port *ap = link->ap; 573 u32 *gscr = (void *)ap->sector_buf; 574 int rc; 575 576 DPRINTK("ENTER\n"); 577 578 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 579 580 if (!ata_dev_enabled(dev)) { 581 rc = -ENODEV; 582 goto fail; 583 } 584 585 /* wrong class? */ 586 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 587 rc = -ENODEV; 588 goto fail; 589 } 590 591 /* read GSCR */ 592 rc = sata_pmp_read_gscr(dev, gscr); 593 if (rc) 594 goto fail; 595 596 /* is the pmp still there? */ 597 if (!sata_pmp_same_pmp(dev, gscr)) { 598 rc = -ENODEV; 599 goto fail; 600 } 601 602 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 603 604 rc = sata_pmp_configure(dev, 0); 605 if (rc) 606 goto fail; 607 608 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 609 610 DPRINTK("EXIT, rc=0\n"); 611 return 0; 612 613 fail: 614 ata_dev_printk(dev, KERN_ERR, 615 "PMP revalidation failed (errno=%d)\n", rc); 616 DPRINTK("EXIT, rc=%d\n", rc); 617 return rc; 618 } 619 620 /** 621 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 622 * @dev: PMP device to revalidate 623 * 624 * Make sure the attached PMP is accessible. 625 * 626 * LOCKING: 627 * Kernel thread context (may sleep). 628 * 629 * RETURNS: 630 * 0 on success, -errno otherwise. 631 */ 632 static int sata_pmp_revalidate_quick(struct ata_device *dev) 633 { 634 unsigned int err_mask; 635 u32 prod_id; 636 637 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 638 if (err_mask) { 639 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 640 "(Emask=0x%x)\n", err_mask); 641 return -EIO; 642 } 643 644 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 645 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); 646 /* something weird is going on, request full PMP recovery */ 647 return -EIO; 648 } 649 650 return 0; 651 } 652 653 /** 654 * sata_pmp_eh_recover_pmp - recover PMP 655 * @ap: ATA port PMP is attached to 656 * @prereset: prereset method (can be NULL) 657 * @softreset: softreset method 658 * @hardreset: hardreset method 659 * @postreset: postreset method (can be NULL) 660 * 661 * Recover PMP attached to @ap. Recovery procedure is somewhat 662 * similar to that of ata_eh_recover() except that reset should 663 * always be performed in hard->soft sequence and recovery 664 * failure results in PMP detachment. 665 * 666 * LOCKING: 667 * Kernel thread context (may sleep). 668 * 669 * RETURNS: 670 * 0 on success, -errno on failure. 671 */ 672 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 673 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 674 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 675 { 676 struct ata_link *link = &ap->link; 677 struct ata_eh_context *ehc = &link->eh_context; 678 struct ata_device *dev = link->device; 679 int tries = ATA_EH_PMP_TRIES; 680 int detach = 0, rc = 0; 681 int reval_failed = 0; 682 683 DPRINTK("ENTER\n"); 684 685 if (dev->flags & ATA_DFLAG_DETACH) { 686 detach = 1; 687 goto fail; 688 } 689 690 retry: 691 ehc->classes[0] = ATA_DEV_UNKNOWN; 692 693 if (ehc->i.action & ATA_EH_RESET) { 694 struct ata_link *tlink; 695 696 /* reset */ 697 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 698 postreset); 699 if (rc) { 700 ata_link_printk(link, KERN_ERR, 701 "failed to reset PMP, giving up\n"); 702 goto fail; 703 } 704 705 /* PMP is reset, SErrors cannot be trusted, scan all */ 706 ata_for_each_link(tlink, ap, EDGE) { 707 struct ata_eh_context *ehc = &tlink->eh_context; 708 709 ehc->i.probe_mask |= ATA_ALL_DEVICES; 710 ehc->i.action |= ATA_EH_RESET; 711 } 712 } 713 714 /* If revalidation is requested, revalidate and reconfigure; 715 * otherwise, do quick revalidation. 716 */ 717 if (ehc->i.action & ATA_EH_REVALIDATE) 718 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 719 else 720 rc = sata_pmp_revalidate_quick(dev); 721 722 if (rc) { 723 tries--; 724 725 if (rc == -ENODEV) { 726 ehc->i.probe_mask |= ATA_ALL_DEVICES; 727 detach = 1; 728 /* give it just two more chances */ 729 tries = min(tries, 2); 730 } 731 732 if (tries) { 733 /* consecutive revalidation failures? speed down */ 734 if (reval_failed) 735 sata_down_spd_limit(link, 0); 736 else 737 reval_failed = 1; 738 739 ehc->i.action |= ATA_EH_RESET; 740 goto retry; 741 } else { 742 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 743 "after %d tries, giving up\n", 744 ATA_EH_PMP_TRIES); 745 goto fail; 746 } 747 } 748 749 /* okay, PMP resurrected */ 750 ehc->i.flags = 0; 751 752 DPRINTK("EXIT, rc=0\n"); 753 return 0; 754 755 fail: 756 sata_pmp_detach(dev); 757 if (detach) 758 ata_eh_detach_dev(dev); 759 else 760 ata_dev_disable(dev); 761 762 DPRINTK("EXIT, rc=%d\n", rc); 763 return rc; 764 } 765 766 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 767 { 768 struct ata_link *link; 769 unsigned long flags; 770 int rc; 771 772 spin_lock_irqsave(ap->lock, flags); 773 774 ata_for_each_link(link, ap, EDGE) { 775 if (!(link->flags & ATA_LFLAG_DISABLED)) 776 continue; 777 778 spin_unlock_irqrestore(ap->lock, flags); 779 780 /* Some PMPs require hardreset sequence to get 781 * SError.N working. 782 */ 783 sata_link_hardreset(link, sata_deb_timing_normal, 784 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 785 NULL, NULL); 786 787 /* unconditionally clear SError.N */ 788 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 789 if (rc) { 790 ata_link_printk(link, KERN_ERR, "failed to clear " 791 "SError.N (errno=%d)\n", rc); 792 return rc; 793 } 794 795 spin_lock_irqsave(ap->lock, flags); 796 } 797 798 spin_unlock_irqrestore(ap->lock, flags); 799 800 return 0; 801 } 802 803 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 804 { 805 struct ata_port *ap = link->ap; 806 unsigned long flags; 807 808 if (link_tries[link->pmp] && --link_tries[link->pmp]) 809 return 1; 810 811 /* disable this link */ 812 if (!(link->flags & ATA_LFLAG_DISABLED)) { 813 ata_link_printk(link, KERN_WARNING, 814 "failed to recover link after %d tries, disabling\n", 815 ATA_EH_PMP_LINK_TRIES); 816 817 spin_lock_irqsave(ap->lock, flags); 818 link->flags |= ATA_LFLAG_DISABLED; 819 spin_unlock_irqrestore(ap->lock, flags); 820 } 821 822 ata_dev_disable(link->device); 823 link->eh_context.i.action = 0; 824 825 return 0; 826 } 827 828 /** 829 * sata_pmp_eh_recover - recover PMP-enabled port 830 * @ap: ATA port to recover 831 * 832 * Drive EH recovery operation for PMP enabled port @ap. This 833 * function recovers host and PMP ports with proper retrials and 834 * fallbacks. Actual recovery operations are performed using 835 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 836 * 837 * LOCKING: 838 * Kernel thread context (may sleep). 839 * 840 * RETURNS: 841 * 0 on success, -errno on failure. 842 */ 843 static int sata_pmp_eh_recover(struct ata_port *ap) 844 { 845 struct ata_port_operations *ops = ap->ops; 846 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 847 struct ata_link *pmp_link = &ap->link; 848 struct ata_device *pmp_dev = pmp_link->device; 849 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 850 u32 *gscr = pmp_dev->gscr; 851 struct ata_link *link; 852 struct ata_device *dev; 853 unsigned int err_mask; 854 u32 gscr_error, sntf; 855 int cnt, rc; 856 857 pmp_tries = ATA_EH_PMP_TRIES; 858 ata_for_each_link(link, ap, EDGE) 859 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 860 861 retry: 862 /* PMP attached? */ 863 if (!sata_pmp_attached(ap)) { 864 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 865 ops->hardreset, ops->postreset, NULL); 866 if (rc) { 867 ata_for_each_dev(dev, &ap->link, ALL) 868 ata_dev_disable(dev); 869 return rc; 870 } 871 872 if (pmp_dev->class != ATA_DEV_PMP) 873 return 0; 874 875 /* new PMP online */ 876 ata_for_each_link(link, ap, EDGE) 877 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 878 879 /* fall through */ 880 } 881 882 /* recover pmp */ 883 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 884 ops->hardreset, ops->postreset); 885 if (rc) 886 goto pmp_fail; 887 888 /* PHY event notification can disturb reset and other recovery 889 * operations. Turn it off. 890 */ 891 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 892 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 893 894 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 895 gscr[SATA_PMP_GSCR_FEAT_EN]); 896 if (err_mask) { 897 ata_link_printk(pmp_link, KERN_WARNING, 898 "failed to disable NOTIFY (err_mask=0x%x)\n", 899 err_mask); 900 goto pmp_fail; 901 } 902 } 903 904 /* handle disabled links */ 905 rc = sata_pmp_eh_handle_disabled_links(ap); 906 if (rc) 907 goto pmp_fail; 908 909 /* recover links */ 910 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 911 ops->pmp_hardreset, ops->pmp_postreset, &link); 912 if (rc) 913 goto link_fail; 914 915 /* Connection status might have changed while resetting other 916 * links, check SATA_PMP_GSCR_ERROR before returning. 917 */ 918 919 /* clear SNotification */ 920 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 921 if (rc == 0) 922 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 923 924 /* enable notification */ 925 if (pmp_dev->flags & ATA_DFLAG_AN) { 926 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 927 928 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 929 gscr[SATA_PMP_GSCR_FEAT_EN]); 930 if (err_mask) { 931 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " 932 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 933 rc = -EIO; 934 goto pmp_fail; 935 } 936 } 937 938 /* check GSCR_ERROR */ 939 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 940 if (err_mask) { 941 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 942 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 943 rc = -EIO; 944 goto pmp_fail; 945 } 946 947 cnt = 0; 948 ata_for_each_link(link, ap, EDGE) { 949 if (!(gscr_error & (1 << link->pmp))) 950 continue; 951 952 if (sata_pmp_handle_link_fail(link, link_tries)) { 953 ata_ehi_hotplugged(&link->eh_context.i); 954 cnt++; 955 } else { 956 ata_link_printk(link, KERN_WARNING, 957 "PHY status changed but maxed out on retries, " 958 "giving up\n"); 959 ata_link_printk(link, KERN_WARNING, 960 "Manully issue scan to resume this link\n"); 961 } 962 } 963 964 if (cnt) { 965 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 966 "ports, repeating recovery\n"); 967 goto retry; 968 } 969 970 return 0; 971 972 link_fail: 973 if (sata_pmp_handle_link_fail(link, link_tries)) { 974 pmp_ehc->i.action |= ATA_EH_RESET; 975 goto retry; 976 } 977 978 /* fall through */ 979 pmp_fail: 980 /* Control always ends up here after detaching PMP. Shut up 981 * and return if we're unloading. 982 */ 983 if (ap->pflags & ATA_PFLAG_UNLOADING) 984 return rc; 985 986 if (!sata_pmp_attached(ap)) 987 goto retry; 988 989 if (--pmp_tries) { 990 pmp_ehc->i.action |= ATA_EH_RESET; 991 goto retry; 992 } 993 994 ata_port_printk(ap, KERN_ERR, 995 "failed to recover PMP after %d tries, giving up\n", 996 ATA_EH_PMP_TRIES); 997 sata_pmp_detach(pmp_dev); 998 ata_dev_disable(pmp_dev); 999 1000 return rc; 1001 } 1002 1003 /** 1004 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1005 * @ap: host port to handle error for 1006 * 1007 * Perform standard error handling sequence for PMP-enabled host 1008 * @ap. 1009 * 1010 * LOCKING: 1011 * Kernel thread context (may sleep). 1012 */ 1013 void sata_pmp_error_handler(struct ata_port *ap) 1014 { 1015 ata_eh_autopsy(ap); 1016 ata_eh_report(ap); 1017 sata_pmp_eh_recover(ap); 1018 ata_eh_finish(ap); 1019 } 1020 1021 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1022 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1023 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1024