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 #define PMP_GSCR_SII_POL 129 235 236 static int sata_pmp_configure(struct ata_device *dev, int print_info) 237 { 238 struct ata_port *ap = dev->link->ap; 239 u32 *gscr = dev->gscr; 240 u16 vendor = sata_pmp_gscr_vendor(gscr); 241 u16 devid = sata_pmp_gscr_devid(gscr); 242 unsigned int err_mask = 0; 243 const char *reason; 244 int nr_ports, rc; 245 246 nr_ports = sata_pmp_gscr_ports(gscr); 247 248 if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) { 249 rc = -EINVAL; 250 reason = "invalid nr_ports"; 251 goto fail; 252 } 253 254 if ((ap->flags & ATA_FLAG_AN) && 255 (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY)) 256 dev->flags |= ATA_DFLAG_AN; 257 258 /* monitor SERR_PHYRDY_CHG on fan-out ports */ 259 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN, 260 SERR_PHYRDY_CHG); 261 if (err_mask) { 262 rc = -EIO; 263 reason = "failed to write GSCR_ERROR_EN"; 264 goto fail; 265 } 266 267 /* Disable sending Early R_OK. 268 * With "cached read" HDD testing and multiple ports busy on a SATA 269 * host controller, 3726 PMP will very rarely drop a deferred 270 * R_OK that was intended for the host. Symptom will be all 271 * 5 drives under test will timeout, get reset, and recover. 272 */ 273 if (vendor == 0x1095 && devid == 0x3726) { 274 u32 reg; 275 276 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, ®); 277 if (err_mask) { 278 rc = -EIO; 279 reason = "failed to read Sil3726 Private Register"; 280 goto fail; 281 } 282 reg &= ~0x1; 283 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg); 284 if (err_mask) { 285 rc = -EIO; 286 reason = "failed to write Sil3726 Private Register"; 287 goto fail; 288 } 289 } 290 291 if (print_info) { 292 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " 293 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 294 sata_pmp_spec_rev_str(gscr), vendor, devid, 295 sata_pmp_gscr_rev(gscr), 296 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 297 gscr[SATA_PMP_GSCR_FEAT]); 298 299 if (!(dev->flags & ATA_DFLAG_AN)) 300 ata_dev_printk(dev, KERN_INFO, 301 "Asynchronous notification not supported, " 302 "hotplug won't\n work on fan-out " 303 "ports. Use warm-plug instead.\n"); 304 } 305 306 return 0; 307 308 fail: 309 ata_dev_printk(dev, KERN_ERR, 310 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 311 reason, err_mask); 312 return rc; 313 } 314 315 static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) 316 { 317 struct ata_link *pmp_link = ap->pmp_link; 318 int i; 319 320 if (!pmp_link) { 321 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 322 GFP_NOIO); 323 if (!pmp_link) 324 return -ENOMEM; 325 326 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 327 ata_link_init(ap, &pmp_link[i], i); 328 329 ap->pmp_link = pmp_link; 330 } 331 332 for (i = 0; i < nr_ports; i++) { 333 struct ata_link *link = &pmp_link[i]; 334 struct ata_eh_context *ehc = &link->eh_context; 335 336 link->flags = 0; 337 ehc->i.probe_mask |= ATA_ALL_DEVICES; 338 ehc->i.action |= ATA_EH_RESET; 339 } 340 341 return 0; 342 } 343 344 static void sata_pmp_quirks(struct ata_port *ap) 345 { 346 u32 *gscr = ap->link.device->gscr; 347 u16 vendor = sata_pmp_gscr_vendor(gscr); 348 u16 devid = sata_pmp_gscr_devid(gscr); 349 struct ata_link *link; 350 351 if (vendor == 0x1095 && devid == 0x3726) { 352 /* sil3726 quirks */ 353 ata_for_each_link(link, ap, EDGE) { 354 /* Class code report is unreliable and SRST 355 * times out under certain configurations. 356 */ 357 if (link->pmp < 5) 358 link->flags |= ATA_LFLAG_NO_SRST | 359 ATA_LFLAG_ASSUME_ATA; 360 361 /* port 5 is for SEMB device and it doesn't like SRST */ 362 if (link->pmp == 5) 363 link->flags |= ATA_LFLAG_NO_SRST | 364 ATA_LFLAG_ASSUME_SEMB; 365 } 366 } else if (vendor == 0x1095 && devid == 0x4723) { 367 /* sil4723 quirks */ 368 ata_for_each_link(link, ap, EDGE) { 369 /* class code report is unreliable */ 370 if (link->pmp < 2) 371 link->flags |= ATA_LFLAG_ASSUME_ATA; 372 373 /* the config device at port 2 locks up on SRST */ 374 if (link->pmp == 2) 375 link->flags |= ATA_LFLAG_NO_SRST | 376 ATA_LFLAG_ASSUME_ATA; 377 } 378 } else if (vendor == 0x1095 && devid == 0x4726) { 379 /* sil4726 quirks */ 380 ata_for_each_link(link, ap, EDGE) { 381 /* Class code report is unreliable and SRST 382 * times out under certain configurations. 383 * Config device can be at port 0 or 5 and 384 * locks up on SRST. 385 */ 386 if (link->pmp <= 5) 387 link->flags |= ATA_LFLAG_NO_SRST | 388 ATA_LFLAG_ASSUME_ATA; 389 390 /* Port 6 is for SEMB device which doesn't 391 * like SRST either. 392 */ 393 if (link->pmp == 6) 394 link->flags |= ATA_LFLAG_NO_SRST | 395 ATA_LFLAG_ASSUME_SEMB; 396 } 397 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 398 devid == 0x5734 || devid == 0x5744)) { 399 /* sil5723/5744 quirks */ 400 401 /* sil5723/5744 has either two or three downstream 402 * ports depending on operation mode. The last port 403 * is empty if any actual IO device is available or 404 * occupied by a pseudo configuration device 405 * otherwise. Don't try hard to recover it. 406 */ 407 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 408 } 409 } 410 411 /** 412 * sata_pmp_attach - attach a SATA PMP device 413 * @dev: SATA PMP device to attach 414 * 415 * Configure and attach SATA PMP device @dev. This function is 416 * also responsible for allocating and initializing PMP links. 417 * 418 * LOCKING: 419 * Kernel thread context (may sleep). 420 * 421 * RETURNS: 422 * 0 on success, -errno on failure. 423 */ 424 int sata_pmp_attach(struct ata_device *dev) 425 { 426 struct ata_link *link = dev->link; 427 struct ata_port *ap = link->ap; 428 unsigned long flags; 429 struct ata_link *tlink; 430 int rc; 431 432 /* is it hanging off the right place? */ 433 if (!sata_pmp_supported(ap)) { 434 ata_dev_printk(dev, KERN_ERR, 435 "host does not support Port Multiplier\n"); 436 return -EINVAL; 437 } 438 439 if (!ata_is_host_link(link)) { 440 ata_dev_printk(dev, KERN_ERR, 441 "Port Multipliers cannot be nested\n"); 442 return -EINVAL; 443 } 444 445 if (dev->devno) { 446 ata_dev_printk(dev, KERN_ERR, 447 "Port Multiplier must be the first device\n"); 448 return -EINVAL; 449 } 450 451 WARN_ON(link->pmp != 0); 452 link->pmp = SATA_PMP_CTRL_PORT; 453 454 /* read GSCR block */ 455 rc = sata_pmp_read_gscr(dev, dev->gscr); 456 if (rc) 457 goto fail; 458 459 /* config PMP */ 460 rc = sata_pmp_configure(dev, 1); 461 if (rc) 462 goto fail; 463 464 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 465 if (rc) { 466 ata_dev_printk(dev, KERN_INFO, 467 "failed to initialize PMP links\n"); 468 goto fail; 469 } 470 471 /* attach it */ 472 spin_lock_irqsave(ap->lock, flags); 473 WARN_ON(ap->nr_pmp_links); 474 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 475 spin_unlock_irqrestore(ap->lock, flags); 476 477 sata_pmp_quirks(ap); 478 479 if (ap->ops->pmp_attach) 480 ap->ops->pmp_attach(ap); 481 482 ata_for_each_link(tlink, ap, EDGE) 483 sata_link_init_spd(tlink); 484 485 ata_acpi_associate_sata_port(ap); 486 487 return 0; 488 489 fail: 490 link->pmp = 0; 491 return rc; 492 } 493 494 /** 495 * sata_pmp_detach - detach a SATA PMP device 496 * @dev: SATA PMP device to detach 497 * 498 * Detach SATA PMP device @dev. This function is also 499 * responsible for deconfiguring PMP links. 500 * 501 * LOCKING: 502 * Kernel thread context (may sleep). 503 */ 504 static void sata_pmp_detach(struct ata_device *dev) 505 { 506 struct ata_link *link = dev->link; 507 struct ata_port *ap = link->ap; 508 struct ata_link *tlink; 509 unsigned long flags; 510 511 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 512 513 WARN_ON(!ata_is_host_link(link) || dev->devno || 514 link->pmp != SATA_PMP_CTRL_PORT); 515 516 if (ap->ops->pmp_detach) 517 ap->ops->pmp_detach(ap); 518 519 ata_for_each_link(tlink, ap, EDGE) 520 ata_eh_detach_dev(tlink->device); 521 522 spin_lock_irqsave(ap->lock, flags); 523 ap->nr_pmp_links = 0; 524 link->pmp = 0; 525 spin_unlock_irqrestore(ap->lock, flags); 526 527 ata_acpi_associate_sata_port(ap); 528 } 529 530 /** 531 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 532 * @dev: PMP device to compare against 533 * @new_gscr: GSCR block of the new device 534 * 535 * Compare @new_gscr against @dev and determine whether @dev is 536 * the PMP described by @new_gscr. 537 * 538 * LOCKING: 539 * None. 540 * 541 * RETURNS: 542 * 1 if @dev matches @new_gscr, 0 otherwise. 543 */ 544 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 545 { 546 const u32 *old_gscr = dev->gscr; 547 u16 old_vendor, new_vendor, old_devid, new_devid; 548 int old_nr_ports, new_nr_ports; 549 550 old_vendor = sata_pmp_gscr_vendor(old_gscr); 551 new_vendor = sata_pmp_gscr_vendor(new_gscr); 552 old_devid = sata_pmp_gscr_devid(old_gscr); 553 new_devid = sata_pmp_gscr_devid(new_gscr); 554 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 555 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 556 557 if (old_vendor != new_vendor) { 558 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 559 "vendor mismatch '0x%x' != '0x%x'\n", 560 old_vendor, new_vendor); 561 return 0; 562 } 563 564 if (old_devid != new_devid) { 565 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 566 "device ID mismatch '0x%x' != '0x%x'\n", 567 old_devid, new_devid); 568 return 0; 569 } 570 571 if (old_nr_ports != new_nr_ports) { 572 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 573 "nr_ports mismatch '0x%x' != '0x%x'\n", 574 old_nr_ports, new_nr_ports); 575 return 0; 576 } 577 578 return 1; 579 } 580 581 /** 582 * sata_pmp_revalidate - revalidate SATA PMP 583 * @dev: PMP device to revalidate 584 * @new_class: new class code 585 * 586 * Re-read GSCR block and make sure @dev is still attached to the 587 * port and properly configured. 588 * 589 * LOCKING: 590 * Kernel thread context (may sleep). 591 * 592 * RETURNS: 593 * 0 on success, -errno otherwise. 594 */ 595 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 596 { 597 struct ata_link *link = dev->link; 598 struct ata_port *ap = link->ap; 599 u32 *gscr = (void *)ap->sector_buf; 600 int rc; 601 602 DPRINTK("ENTER\n"); 603 604 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 605 606 if (!ata_dev_enabled(dev)) { 607 rc = -ENODEV; 608 goto fail; 609 } 610 611 /* wrong class? */ 612 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 613 rc = -ENODEV; 614 goto fail; 615 } 616 617 /* read GSCR */ 618 rc = sata_pmp_read_gscr(dev, gscr); 619 if (rc) 620 goto fail; 621 622 /* is the pmp still there? */ 623 if (!sata_pmp_same_pmp(dev, gscr)) { 624 rc = -ENODEV; 625 goto fail; 626 } 627 628 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 629 630 rc = sata_pmp_configure(dev, 0); 631 if (rc) 632 goto fail; 633 634 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 635 636 DPRINTK("EXIT, rc=0\n"); 637 return 0; 638 639 fail: 640 ata_dev_printk(dev, KERN_ERR, 641 "PMP revalidation failed (errno=%d)\n", rc); 642 DPRINTK("EXIT, rc=%d\n", rc); 643 return rc; 644 } 645 646 /** 647 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 648 * @dev: PMP device to revalidate 649 * 650 * Make sure the attached PMP is accessible. 651 * 652 * LOCKING: 653 * Kernel thread context (may sleep). 654 * 655 * RETURNS: 656 * 0 on success, -errno otherwise. 657 */ 658 static int sata_pmp_revalidate_quick(struct ata_device *dev) 659 { 660 unsigned int err_mask; 661 u32 prod_id; 662 663 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 664 if (err_mask) { 665 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 666 "(Emask=0x%x)\n", err_mask); 667 return -EIO; 668 } 669 670 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 671 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); 672 /* something weird is going on, request full PMP recovery */ 673 return -EIO; 674 } 675 676 return 0; 677 } 678 679 /** 680 * sata_pmp_eh_recover_pmp - recover PMP 681 * @ap: ATA port PMP is attached to 682 * @prereset: prereset method (can be NULL) 683 * @softreset: softreset method 684 * @hardreset: hardreset method 685 * @postreset: postreset method (can be NULL) 686 * 687 * Recover PMP attached to @ap. Recovery procedure is somewhat 688 * similar to that of ata_eh_recover() except that reset should 689 * always be performed in hard->soft sequence and recovery 690 * failure results in PMP detachment. 691 * 692 * LOCKING: 693 * Kernel thread context (may sleep). 694 * 695 * RETURNS: 696 * 0 on success, -errno on failure. 697 */ 698 static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 699 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 700 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 701 { 702 struct ata_link *link = &ap->link; 703 struct ata_eh_context *ehc = &link->eh_context; 704 struct ata_device *dev = link->device; 705 int tries = ATA_EH_PMP_TRIES; 706 int detach = 0, rc = 0; 707 int reval_failed = 0; 708 709 DPRINTK("ENTER\n"); 710 711 if (dev->flags & ATA_DFLAG_DETACH) { 712 detach = 1; 713 goto fail; 714 } 715 716 retry: 717 ehc->classes[0] = ATA_DEV_UNKNOWN; 718 719 if (ehc->i.action & ATA_EH_RESET) { 720 struct ata_link *tlink; 721 722 /* reset */ 723 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 724 postreset); 725 if (rc) { 726 ata_link_printk(link, KERN_ERR, 727 "failed to reset PMP, giving up\n"); 728 goto fail; 729 } 730 731 /* PMP is reset, SErrors cannot be trusted, scan all */ 732 ata_for_each_link(tlink, ap, EDGE) { 733 struct ata_eh_context *ehc = &tlink->eh_context; 734 735 ehc->i.probe_mask |= ATA_ALL_DEVICES; 736 ehc->i.action |= ATA_EH_RESET; 737 } 738 } 739 740 /* If revalidation is requested, revalidate and reconfigure; 741 * otherwise, do quick revalidation. 742 */ 743 if (ehc->i.action & ATA_EH_REVALIDATE) 744 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 745 else 746 rc = sata_pmp_revalidate_quick(dev); 747 748 if (rc) { 749 tries--; 750 751 if (rc == -ENODEV) { 752 ehc->i.probe_mask |= ATA_ALL_DEVICES; 753 detach = 1; 754 /* give it just two more chances */ 755 tries = min(tries, 2); 756 } 757 758 if (tries) { 759 /* consecutive revalidation failures? speed down */ 760 if (reval_failed) 761 sata_down_spd_limit(link, 0); 762 else 763 reval_failed = 1; 764 765 ehc->i.action |= ATA_EH_RESET; 766 goto retry; 767 } else { 768 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 769 "after %d tries, giving up\n", 770 ATA_EH_PMP_TRIES); 771 goto fail; 772 } 773 } 774 775 /* okay, PMP resurrected */ 776 ehc->i.flags = 0; 777 778 DPRINTK("EXIT, rc=0\n"); 779 return 0; 780 781 fail: 782 sata_pmp_detach(dev); 783 if (detach) 784 ata_eh_detach_dev(dev); 785 else 786 ata_dev_disable(dev); 787 788 DPRINTK("EXIT, rc=%d\n", rc); 789 return rc; 790 } 791 792 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 793 { 794 struct ata_link *link; 795 unsigned long flags; 796 int rc; 797 798 spin_lock_irqsave(ap->lock, flags); 799 800 ata_for_each_link(link, ap, EDGE) { 801 if (!(link->flags & ATA_LFLAG_DISABLED)) 802 continue; 803 804 spin_unlock_irqrestore(ap->lock, flags); 805 806 /* Some PMPs require hardreset sequence to get 807 * SError.N working. 808 */ 809 sata_link_hardreset(link, sata_deb_timing_normal, 810 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK), 811 NULL, NULL); 812 813 /* unconditionally clear SError.N */ 814 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 815 if (rc) { 816 ata_link_printk(link, KERN_ERR, "failed to clear " 817 "SError.N (errno=%d)\n", rc); 818 return rc; 819 } 820 821 spin_lock_irqsave(ap->lock, flags); 822 } 823 824 spin_unlock_irqrestore(ap->lock, flags); 825 826 return 0; 827 } 828 829 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 830 { 831 struct ata_port *ap = link->ap; 832 unsigned long flags; 833 834 if (link_tries[link->pmp] && --link_tries[link->pmp]) 835 return 1; 836 837 /* disable this link */ 838 if (!(link->flags & ATA_LFLAG_DISABLED)) { 839 ata_link_printk(link, KERN_WARNING, 840 "failed to recover link after %d tries, disabling\n", 841 ATA_EH_PMP_LINK_TRIES); 842 843 spin_lock_irqsave(ap->lock, flags); 844 link->flags |= ATA_LFLAG_DISABLED; 845 spin_unlock_irqrestore(ap->lock, flags); 846 } 847 848 ata_dev_disable(link->device); 849 link->eh_context.i.action = 0; 850 851 return 0; 852 } 853 854 /** 855 * sata_pmp_eh_recover - recover PMP-enabled port 856 * @ap: ATA port to recover 857 * 858 * Drive EH recovery operation for PMP enabled port @ap. This 859 * function recovers host and PMP ports with proper retrials and 860 * fallbacks. Actual recovery operations are performed using 861 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 862 * 863 * LOCKING: 864 * Kernel thread context (may sleep). 865 * 866 * RETURNS: 867 * 0 on success, -errno on failure. 868 */ 869 static int sata_pmp_eh_recover(struct ata_port *ap) 870 { 871 struct ata_port_operations *ops = ap->ops; 872 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 873 struct ata_link *pmp_link = &ap->link; 874 struct ata_device *pmp_dev = pmp_link->device; 875 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 876 u32 *gscr = pmp_dev->gscr; 877 struct ata_link *link; 878 struct ata_device *dev; 879 unsigned int err_mask; 880 u32 gscr_error, sntf; 881 int cnt, rc; 882 883 pmp_tries = ATA_EH_PMP_TRIES; 884 ata_for_each_link(link, ap, EDGE) 885 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 886 887 retry: 888 /* PMP attached? */ 889 if (!sata_pmp_attached(ap)) { 890 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 891 ops->hardreset, ops->postreset, NULL); 892 if (rc) { 893 ata_for_each_dev(dev, &ap->link, ALL) 894 ata_dev_disable(dev); 895 return rc; 896 } 897 898 if (pmp_dev->class != ATA_DEV_PMP) 899 return 0; 900 901 /* new PMP online */ 902 ata_for_each_link(link, ap, EDGE) 903 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 904 905 /* fall through */ 906 } 907 908 /* recover pmp */ 909 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 910 ops->hardreset, ops->postreset); 911 if (rc) 912 goto pmp_fail; 913 914 /* PHY event notification can disturb reset and other recovery 915 * operations. Turn it off. 916 */ 917 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 918 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 919 920 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 921 gscr[SATA_PMP_GSCR_FEAT_EN]); 922 if (err_mask) { 923 ata_link_printk(pmp_link, KERN_WARNING, 924 "failed to disable NOTIFY (err_mask=0x%x)\n", 925 err_mask); 926 goto pmp_fail; 927 } 928 } 929 930 /* handle disabled links */ 931 rc = sata_pmp_eh_handle_disabled_links(ap); 932 if (rc) 933 goto pmp_fail; 934 935 /* recover links */ 936 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 937 ops->pmp_hardreset, ops->pmp_postreset, &link); 938 if (rc) 939 goto link_fail; 940 941 /* Connection status might have changed while resetting other 942 * links, check SATA_PMP_GSCR_ERROR before returning. 943 */ 944 945 /* clear SNotification */ 946 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 947 if (rc == 0) 948 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 949 950 /* enable notification */ 951 if (pmp_dev->flags & ATA_DFLAG_AN) { 952 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 953 954 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN, 955 gscr[SATA_PMP_GSCR_FEAT_EN]); 956 if (err_mask) { 957 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " 958 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 959 rc = -EIO; 960 goto pmp_fail; 961 } 962 } 963 964 /* check GSCR_ERROR */ 965 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 966 if (err_mask) { 967 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 968 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 969 rc = -EIO; 970 goto pmp_fail; 971 } 972 973 cnt = 0; 974 ata_for_each_link(link, ap, EDGE) { 975 if (!(gscr_error & (1 << link->pmp))) 976 continue; 977 978 if (sata_pmp_handle_link_fail(link, link_tries)) { 979 ata_ehi_hotplugged(&link->eh_context.i); 980 cnt++; 981 } else { 982 ata_link_printk(link, KERN_WARNING, 983 "PHY status changed but maxed out on retries, " 984 "giving up\n"); 985 ata_link_printk(link, KERN_WARNING, 986 "Manully issue scan to resume this link\n"); 987 } 988 } 989 990 if (cnt) { 991 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 992 "ports, repeating recovery\n"); 993 goto retry; 994 } 995 996 return 0; 997 998 link_fail: 999 if (sata_pmp_handle_link_fail(link, link_tries)) { 1000 pmp_ehc->i.action |= ATA_EH_RESET; 1001 goto retry; 1002 } 1003 1004 /* fall through */ 1005 pmp_fail: 1006 /* Control always ends up here after detaching PMP. Shut up 1007 * and return if we're unloading. 1008 */ 1009 if (ap->pflags & ATA_PFLAG_UNLOADING) 1010 return rc; 1011 1012 if (!sata_pmp_attached(ap)) 1013 goto retry; 1014 1015 if (--pmp_tries) { 1016 pmp_ehc->i.action |= ATA_EH_RESET; 1017 goto retry; 1018 } 1019 1020 ata_port_printk(ap, KERN_ERR, 1021 "failed to recover PMP after %d tries, giving up\n", 1022 ATA_EH_PMP_TRIES); 1023 sata_pmp_detach(pmp_dev); 1024 ata_dev_disable(pmp_dev); 1025 1026 return rc; 1027 } 1028 1029 /** 1030 * sata_pmp_error_handler - do standard error handling for PMP-enabled host 1031 * @ap: host port to handle error for 1032 * 1033 * Perform standard error handling sequence for PMP-enabled host 1034 * @ap. 1035 * 1036 * LOCKING: 1037 * Kernel thread context (may sleep). 1038 */ 1039 void sata_pmp_error_handler(struct ata_port *ap) 1040 { 1041 ata_eh_autopsy(ap); 1042 ata_eh_report(ap); 1043 sata_pmp_eh_recover(ap); 1044 ata_eh_finish(ap); 1045 } 1046 1047 EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1048 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1049 EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1050