libata-pmp.c revision bf1bff6fa9fdd4e92e57d80a5434fd5201c051fc
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 14const 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 */ 36static 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 */ 73static 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 */ 107int 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 */ 139int 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 */ 170int 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 */ 200static 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 220static 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 231static 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 /* turn off notification till fan-out ports are reset and configured */ 261 if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) { 262 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY; 263 264 err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_FEAT_EN, 265 gscr[SATA_PMP_GSCR_FEAT_EN]); 266 if (err_mask) { 267 rc = -EIO; 268 reason = "failed to write GSCR_FEAT_EN"; 269 goto fail; 270 } 271 } 272 273 if (print_info) { 274 ata_dev_printk(dev, KERN_INFO, "Port Multiplier %s, " 275 "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n", 276 sata_pmp_spec_rev_str(gscr), 277 sata_pmp_gscr_vendor(gscr), 278 sata_pmp_gscr_devid(gscr), 279 sata_pmp_gscr_rev(gscr), 280 nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN], 281 gscr[SATA_PMP_GSCR_FEAT]); 282 283 if (!(dev->flags & ATA_DFLAG_AN)) 284 ata_dev_printk(dev, KERN_INFO, 285 "Asynchronous notification not supported, " 286 "hotplug won't\n work on fan-out " 287 "ports. Use warm-plug instead.\n"); 288 } 289 290 return 0; 291 292 fail: 293 ata_dev_printk(dev, KERN_ERR, 294 "failed to configure Port Multiplier (%s, Emask=0x%x)\n", 295 reason, err_mask); 296 return rc; 297} 298 299static int sata_pmp_init_links(struct ata_port *ap, int nr_ports) 300{ 301 struct ata_link *pmp_link = ap->pmp_link; 302 int i; 303 304 if (!pmp_link) { 305 pmp_link = kzalloc(sizeof(pmp_link[0]) * SATA_PMP_MAX_PORTS, 306 GFP_NOIO); 307 if (!pmp_link) 308 return -ENOMEM; 309 310 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) 311 ata_link_init(ap, &pmp_link[i], i); 312 313 ap->pmp_link = pmp_link; 314 } 315 316 for (i = 0; i < nr_ports; i++) { 317 struct ata_link *link = &pmp_link[i]; 318 struct ata_eh_context *ehc = &link->eh_context; 319 320 link->flags = 0; 321 ehc->i.probe_mask |= ATA_ALL_DEVICES; 322 ehc->i.action |= ATA_EH_RESET; 323 } 324 325 return 0; 326} 327 328static void sata_pmp_quirks(struct ata_port *ap) 329{ 330 u32 *gscr = ap->link.device->gscr; 331 u16 vendor = sata_pmp_gscr_vendor(gscr); 332 u16 devid = sata_pmp_gscr_devid(gscr); 333 struct ata_link *link; 334 335 if (vendor == 0x1095 && devid == 0x3726) { 336 /* sil3726 quirks */ 337 ata_port_for_each_link(link, ap) { 338 /* class code report is unreliable */ 339 if (link->pmp < 5) 340 link->flags |= ATA_LFLAG_ASSUME_ATA; 341 342 /* port 5 is for SEMB device and it doesn't like SRST */ 343 if (link->pmp == 5) 344 link->flags |= ATA_LFLAG_NO_SRST | 345 ATA_LFLAG_ASSUME_SEMB; 346 } 347 } else if (vendor == 0x1095 && devid == 0x4723) { 348 /* sil4723 quirks */ 349 ata_port_for_each_link(link, ap) { 350 /* class code report is unreliable */ 351 if (link->pmp < 2) 352 link->flags |= ATA_LFLAG_ASSUME_ATA; 353 354 /* the config device at port 2 locks up on SRST */ 355 if (link->pmp == 2) 356 link->flags |= ATA_LFLAG_NO_SRST | 357 ATA_LFLAG_ASSUME_ATA; 358 } 359 } else if (vendor == 0x1095 && devid == 0x4726) { 360 /* sil4726 quirks */ 361 ata_port_for_each_link(link, ap) { 362 /* Class code report is unreliable and SRST 363 * times out under certain configurations. 364 * Config device can be at port 0 or 5 and 365 * locks up on SRST. 366 */ 367 if (link->pmp <= 5) 368 link->flags |= ATA_LFLAG_NO_SRST | 369 ATA_LFLAG_ASSUME_ATA; 370 371 /* Port 6 is for SEMB device which doesn't 372 * like SRST either. 373 */ 374 if (link->pmp == 6) 375 link->flags |= ATA_LFLAG_NO_SRST | 376 ATA_LFLAG_ASSUME_SEMB; 377 } 378 } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 || 379 devid == 0x5734 || devid == 0x5744)) { 380 /* sil5723/5744 quirks */ 381 382 /* sil5723/5744 has either two or three downstream 383 * ports depending on operation mode. The last port 384 * is empty if any actual IO device is available or 385 * occupied by a pseudo configuration device 386 * otherwise. Don't try hard to recover it. 387 */ 388 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY; 389 } 390} 391 392/** 393 * sata_pmp_attach - attach a SATA PMP device 394 * @dev: SATA PMP device to attach 395 * 396 * Configure and attach SATA PMP device @dev. This function is 397 * also responsible for allocating and initializing PMP links. 398 * 399 * LOCKING: 400 * Kernel thread context (may sleep). 401 * 402 * RETURNS: 403 * 0 on success, -errno on failure. 404 */ 405int sata_pmp_attach(struct ata_device *dev) 406{ 407 struct ata_link *link = dev->link; 408 struct ata_port *ap = link->ap; 409 unsigned long flags; 410 struct ata_link *tlink; 411 int rc; 412 413 /* is it hanging off the right place? */ 414 if (!sata_pmp_supported(ap)) { 415 ata_dev_printk(dev, KERN_ERR, 416 "host does not support Port Multiplier\n"); 417 return -EINVAL; 418 } 419 420 if (!ata_is_host_link(link)) { 421 ata_dev_printk(dev, KERN_ERR, 422 "Port Multipliers cannot be nested\n"); 423 return -EINVAL; 424 } 425 426 if (dev->devno) { 427 ata_dev_printk(dev, KERN_ERR, 428 "Port Multiplier must be the first device\n"); 429 return -EINVAL; 430 } 431 432 WARN_ON(link->pmp != 0); 433 link->pmp = SATA_PMP_CTRL_PORT; 434 435 /* read GSCR block */ 436 rc = sata_pmp_read_gscr(dev, dev->gscr); 437 if (rc) 438 goto fail; 439 440 /* config PMP */ 441 rc = sata_pmp_configure(dev, 1); 442 if (rc) 443 goto fail; 444 445 rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr)); 446 if (rc) { 447 ata_dev_printk(dev, KERN_INFO, 448 "failed to initialize PMP links\n"); 449 goto fail; 450 } 451 452 /* attach it */ 453 spin_lock_irqsave(ap->lock, flags); 454 WARN_ON(ap->nr_pmp_links); 455 ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr); 456 spin_unlock_irqrestore(ap->lock, flags); 457 458 sata_pmp_quirks(ap); 459 460 if (ap->ops->pmp_attach) 461 ap->ops->pmp_attach(ap); 462 463 ata_port_for_each_link(tlink, ap) 464 sata_link_init_spd(tlink); 465 466 ata_acpi_associate_sata_port(ap); 467 468 return 0; 469 470 fail: 471 link->pmp = 0; 472 return rc; 473} 474 475/** 476 * sata_pmp_detach - detach a SATA PMP device 477 * @dev: SATA PMP device to detach 478 * 479 * Detach SATA PMP device @dev. This function is also 480 * responsible for deconfiguring PMP links. 481 * 482 * LOCKING: 483 * Kernel thread context (may sleep). 484 */ 485static void sata_pmp_detach(struct ata_device *dev) 486{ 487 struct ata_link *link = dev->link; 488 struct ata_port *ap = link->ap; 489 struct ata_link *tlink; 490 unsigned long flags; 491 492 ata_dev_printk(dev, KERN_INFO, "Port Multiplier detaching\n"); 493 494 WARN_ON(!ata_is_host_link(link) || dev->devno || 495 link->pmp != SATA_PMP_CTRL_PORT); 496 497 if (ap->ops->pmp_detach) 498 ap->ops->pmp_detach(ap); 499 500 ata_port_for_each_link(tlink, ap) 501 ata_eh_detach_dev(tlink->device); 502 503 spin_lock_irqsave(ap->lock, flags); 504 ap->nr_pmp_links = 0; 505 link->pmp = 0; 506 spin_unlock_irqrestore(ap->lock, flags); 507 508 ata_acpi_associate_sata_port(ap); 509} 510 511/** 512 * sata_pmp_same_pmp - does new GSCR matches the configured PMP? 513 * @dev: PMP device to compare against 514 * @new_gscr: GSCR block of the new device 515 * 516 * Compare @new_gscr against @dev and determine whether @dev is 517 * the PMP described by @new_gscr. 518 * 519 * LOCKING: 520 * None. 521 * 522 * RETURNS: 523 * 1 if @dev matches @new_gscr, 0 otherwise. 524 */ 525static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr) 526{ 527 const u32 *old_gscr = dev->gscr; 528 u16 old_vendor, new_vendor, old_devid, new_devid; 529 int old_nr_ports, new_nr_ports; 530 531 old_vendor = sata_pmp_gscr_vendor(old_gscr); 532 new_vendor = sata_pmp_gscr_vendor(new_gscr); 533 old_devid = sata_pmp_gscr_devid(old_gscr); 534 new_devid = sata_pmp_gscr_devid(new_gscr); 535 old_nr_ports = sata_pmp_gscr_ports(old_gscr); 536 new_nr_ports = sata_pmp_gscr_ports(new_gscr); 537 538 if (old_vendor != new_vendor) { 539 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 540 "vendor mismatch '0x%x' != '0x%x'\n", 541 old_vendor, new_vendor); 542 return 0; 543 } 544 545 if (old_devid != new_devid) { 546 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 547 "device ID mismatch '0x%x' != '0x%x'\n", 548 old_devid, new_devid); 549 return 0; 550 } 551 552 if (old_nr_ports != new_nr_ports) { 553 ata_dev_printk(dev, KERN_INFO, "Port Multiplier " 554 "nr_ports mismatch '0x%x' != '0x%x'\n", 555 old_nr_ports, new_nr_ports); 556 return 0; 557 } 558 559 return 1; 560} 561 562/** 563 * sata_pmp_revalidate - revalidate SATA PMP 564 * @dev: PMP device to revalidate 565 * @new_class: new class code 566 * 567 * Re-read GSCR block and make sure @dev is still attached to the 568 * port and properly configured. 569 * 570 * LOCKING: 571 * Kernel thread context (may sleep). 572 * 573 * RETURNS: 574 * 0 on success, -errno otherwise. 575 */ 576static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class) 577{ 578 struct ata_link *link = dev->link; 579 struct ata_port *ap = link->ap; 580 u32 *gscr = (void *)ap->sector_buf; 581 int rc; 582 583 DPRINTK("ENTER\n"); 584 585 ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE); 586 587 if (!ata_dev_enabled(dev)) { 588 rc = -ENODEV; 589 goto fail; 590 } 591 592 /* wrong class? */ 593 if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) { 594 rc = -ENODEV; 595 goto fail; 596 } 597 598 /* read GSCR */ 599 rc = sata_pmp_read_gscr(dev, gscr); 600 if (rc) 601 goto fail; 602 603 /* is the pmp still there? */ 604 if (!sata_pmp_same_pmp(dev, gscr)) { 605 rc = -ENODEV; 606 goto fail; 607 } 608 609 memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS); 610 611 rc = sata_pmp_configure(dev, 0); 612 if (rc) 613 goto fail; 614 615 ata_eh_done(link, NULL, ATA_EH_REVALIDATE); 616 617 DPRINTK("EXIT, rc=0\n"); 618 return 0; 619 620 fail: 621 ata_dev_printk(dev, KERN_ERR, 622 "PMP revalidation failed (errno=%d)\n", rc); 623 DPRINTK("EXIT, rc=%d\n", rc); 624 return rc; 625} 626 627/** 628 * sata_pmp_revalidate_quick - revalidate SATA PMP quickly 629 * @dev: PMP device to revalidate 630 * 631 * Make sure the attached PMP is accessible. 632 * 633 * LOCKING: 634 * Kernel thread context (may sleep). 635 * 636 * RETURNS: 637 * 0 on success, -errno otherwise. 638 */ 639static int sata_pmp_revalidate_quick(struct ata_device *dev) 640{ 641 unsigned int err_mask; 642 u32 prod_id; 643 644 err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id); 645 if (err_mask) { 646 ata_dev_printk(dev, KERN_ERR, "failed to read PMP product ID " 647 "(Emask=0x%x)\n", err_mask); 648 return -EIO; 649 } 650 651 if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) { 652 ata_dev_printk(dev, KERN_ERR, "PMP product ID mismatch\n"); 653 /* something weird is going on, request full PMP recovery */ 654 return -EIO; 655 } 656 657 return 0; 658} 659 660/** 661 * sata_pmp_eh_recover_pmp - recover PMP 662 * @ap: ATA port PMP is attached to 663 * @prereset: prereset method (can be NULL) 664 * @softreset: softreset method 665 * @hardreset: hardreset method 666 * @postreset: postreset method (can be NULL) 667 * 668 * Recover PMP attached to @ap. Recovery procedure is somewhat 669 * similar to that of ata_eh_recover() except that reset should 670 * always be performed in hard->soft sequence and recovery 671 * failure results in PMP detachment. 672 * 673 * LOCKING: 674 * Kernel thread context (may sleep). 675 * 676 * RETURNS: 677 * 0 on success, -errno on failure. 678 */ 679static int sata_pmp_eh_recover_pmp(struct ata_port *ap, 680 ata_prereset_fn_t prereset, ata_reset_fn_t softreset, 681 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset) 682{ 683 struct ata_link *link = &ap->link; 684 struct ata_eh_context *ehc = &link->eh_context; 685 struct ata_device *dev = link->device; 686 int tries = ATA_EH_PMP_TRIES; 687 int detach = 0, rc = 0; 688 int reval_failed = 0; 689 690 DPRINTK("ENTER\n"); 691 692 if (dev->flags & ATA_DFLAG_DETACH) { 693 detach = 1; 694 goto fail; 695 } 696 697 retry: 698 ehc->classes[0] = ATA_DEV_UNKNOWN; 699 700 if (ehc->i.action & ATA_EH_RESET) { 701 struct ata_link *tlink; 702 703 /* reset */ 704 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset, 705 postreset); 706 if (rc) { 707 ata_link_printk(link, KERN_ERR, 708 "failed to reset PMP, giving up\n"); 709 goto fail; 710 } 711 712 /* PMP is reset, SErrors cannot be trusted, scan all */ 713 ata_port_for_each_link(tlink, ap) { 714 struct ata_eh_context *ehc = &tlink->eh_context; 715 716 ehc->i.probe_mask |= ATA_ALL_DEVICES; 717 ehc->i.action |= ATA_EH_RESET; 718 } 719 } 720 721 /* If revalidation is requested, revalidate and reconfigure; 722 * otherwise, do quick revalidation. 723 */ 724 if (ehc->i.action & ATA_EH_REVALIDATE) 725 rc = sata_pmp_revalidate(dev, ehc->classes[0]); 726 else 727 rc = sata_pmp_revalidate_quick(dev); 728 729 if (rc) { 730 tries--; 731 732 if (rc == -ENODEV) { 733 ehc->i.probe_mask |= ATA_ALL_DEVICES; 734 detach = 1; 735 /* give it just two more chances */ 736 tries = min(tries, 2); 737 } 738 739 if (tries) { 740 int sleep = ehc->i.flags & ATA_EHI_DID_RESET; 741 742 /* consecutive revalidation failures? speed down */ 743 if (reval_failed) 744 sata_down_spd_limit(link); 745 else 746 reval_failed = 1; 747 748 ata_dev_printk(dev, KERN_WARNING, 749 "retrying reset%s\n", 750 sleep ? " in 5 secs" : ""); 751 if (sleep) 752 ssleep(5); 753 ehc->i.action |= ATA_EH_RESET; 754 goto retry; 755 } else { 756 ata_dev_printk(dev, KERN_ERR, "failed to recover PMP " 757 "after %d tries, giving up\n", 758 ATA_EH_PMP_TRIES); 759 goto fail; 760 } 761 } 762 763 /* okay, PMP resurrected */ 764 ehc->i.flags = 0; 765 766 DPRINTK("EXIT, rc=0\n"); 767 return 0; 768 769 fail: 770 sata_pmp_detach(dev); 771 if (detach) 772 ata_eh_detach_dev(dev); 773 else 774 ata_dev_disable(dev); 775 776 DPRINTK("EXIT, rc=%d\n", rc); 777 return rc; 778} 779 780static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap) 781{ 782 struct ata_link *link; 783 unsigned long flags; 784 int rc; 785 786 spin_lock_irqsave(ap->lock, flags); 787 788 ata_port_for_each_link(link, ap) { 789 if (!(link->flags & ATA_LFLAG_DISABLED)) 790 continue; 791 792 spin_unlock_irqrestore(ap->lock, flags); 793 794 /* Some PMPs require hardreset sequence to get 795 * SError.N working. 796 */ 797 sata_link_hardreset(link, sata_deb_timing_normal, 798 jiffies + ATA_TMOUT_INTERNAL_QUICK, NULL, NULL); 799 800 /* unconditionally clear SError.N */ 801 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG); 802 if (rc) { 803 ata_link_printk(link, KERN_ERR, "failed to clear " 804 "SError.N (errno=%d)\n", rc); 805 return rc; 806 } 807 808 spin_lock_irqsave(ap->lock, flags); 809 } 810 811 spin_unlock_irqrestore(ap->lock, flags); 812 813 return 0; 814} 815 816static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries) 817{ 818 struct ata_port *ap = link->ap; 819 unsigned long flags; 820 821 if (link_tries[link->pmp] && --link_tries[link->pmp]) 822 return 1; 823 824 /* disable this link */ 825 if (!(link->flags & ATA_LFLAG_DISABLED)) { 826 ata_link_printk(link, KERN_WARNING, 827 "failed to recover link after %d tries, disabling\n", 828 ATA_EH_PMP_LINK_TRIES); 829 830 spin_lock_irqsave(ap->lock, flags); 831 link->flags |= ATA_LFLAG_DISABLED; 832 spin_unlock_irqrestore(ap->lock, flags); 833 } 834 835 ata_dev_disable(link->device); 836 link->eh_context.i.action = 0; 837 838 return 0; 839} 840 841/** 842 * sata_pmp_eh_recover - recover PMP-enabled port 843 * @ap: ATA port to recover 844 * 845 * Drive EH recovery operation for PMP enabled port @ap. This 846 * function recovers host and PMP ports with proper retrials and 847 * fallbacks. Actual recovery operations are performed using 848 * ata_eh_recover() and sata_pmp_eh_recover_pmp(). 849 * 850 * LOCKING: 851 * Kernel thread context (may sleep). 852 * 853 * RETURNS: 854 * 0 on success, -errno on failure. 855 */ 856static int sata_pmp_eh_recover(struct ata_port *ap) 857{ 858 struct ata_port_operations *ops = ap->ops; 859 int pmp_tries, link_tries[SATA_PMP_MAX_PORTS]; 860 struct ata_link *pmp_link = &ap->link; 861 struct ata_device *pmp_dev = pmp_link->device; 862 struct ata_eh_context *pmp_ehc = &pmp_link->eh_context; 863 struct ata_link *link; 864 struct ata_device *dev; 865 unsigned int err_mask; 866 u32 gscr_error, sntf; 867 int cnt, rc; 868 869 pmp_tries = ATA_EH_PMP_TRIES; 870 ata_port_for_each_link(link, ap) 871 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 872 873 retry: 874 /* PMP attached? */ 875 if (!sata_pmp_attached(ap)) { 876 rc = ata_eh_recover(ap, ops->prereset, ops->softreset, 877 ops->hardreset, ops->postreset, NULL); 878 if (rc) { 879 ata_link_for_each_dev(dev, &ap->link) 880 ata_dev_disable(dev); 881 return rc; 882 } 883 884 if (pmp_dev->class != ATA_DEV_PMP) 885 return 0; 886 887 /* new PMP online */ 888 ata_port_for_each_link(link, ap) 889 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES; 890 891 /* fall through */ 892 } 893 894 /* recover pmp */ 895 rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset, 896 ops->hardreset, ops->postreset); 897 if (rc) 898 goto pmp_fail; 899 900 /* handle disabled links */ 901 rc = sata_pmp_eh_handle_disabled_links(ap); 902 if (rc) 903 goto pmp_fail; 904 905 /* recover links */ 906 rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset, 907 ops->pmp_hardreset, ops->pmp_postreset, &link); 908 if (rc) 909 goto link_fail; 910 911 /* Connection status might have changed while resetting other 912 * links, check SATA_PMP_GSCR_ERROR before returning. 913 */ 914 915 /* clear SNotification */ 916 rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf); 917 if (rc == 0) 918 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf); 919 920 /* enable notification */ 921 if (pmp_dev->flags & ATA_DFLAG_AN) { 922 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY; 923 924 err_mask = sata_pmp_write(pmp_dev->link, SATA_PMP_GSCR_FEAT_EN, 925 pmp_dev->gscr[SATA_PMP_GSCR_FEAT_EN]); 926 if (err_mask) { 927 ata_dev_printk(pmp_dev, KERN_ERR, "failed to write " 928 "PMP_FEAT_EN (Emask=0x%x)\n", err_mask); 929 rc = -EIO; 930 goto pmp_fail; 931 } 932 } 933 934 /* check GSCR_ERROR */ 935 err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error); 936 if (err_mask) { 937 ata_dev_printk(pmp_dev, KERN_ERR, "failed to read " 938 "PMP_GSCR_ERROR (Emask=0x%x)\n", err_mask); 939 rc = -EIO; 940 goto pmp_fail; 941 } 942 943 cnt = 0; 944 ata_port_for_each_link(link, ap) { 945 if (!(gscr_error & (1 << link->pmp))) 946 continue; 947 948 if (sata_pmp_handle_link_fail(link, link_tries)) { 949 ata_ehi_hotplugged(&link->eh_context.i); 950 cnt++; 951 } else { 952 ata_link_printk(link, KERN_WARNING, 953 "PHY status changed but maxed out on retries, " 954 "giving up\n"); 955 ata_link_printk(link, KERN_WARNING, 956 "Manully issue scan to resume this link\n"); 957 } 958 } 959 960 if (cnt) { 961 ata_port_printk(ap, KERN_INFO, "PMP SError.N set for some " 962 "ports, repeating recovery\n"); 963 goto retry; 964 } 965 966 return 0; 967 968 link_fail: 969 if (sata_pmp_handle_link_fail(link, link_tries)) { 970 pmp_ehc->i.action |= ATA_EH_RESET; 971 goto retry; 972 } 973 974 /* fall through */ 975 pmp_fail: 976 /* Control always ends up here after detaching PMP. Shut up 977 * and return if we're unloading. 978 */ 979 if (ap->pflags & ATA_PFLAG_UNLOADING) 980 return rc; 981 982 if (!sata_pmp_attached(ap)) 983 goto retry; 984 985 if (--pmp_tries) { 986 ata_port_printk(ap, KERN_WARNING, 987 "failed to recover PMP, retrying in 5 secs\n"); 988 pmp_ehc->i.action |= ATA_EH_RESET; 989 ssleep(5); 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 */ 1012void 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 1020EXPORT_SYMBOL_GPL(sata_pmp_port_ops); 1021EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch); 1022EXPORT_SYMBOL_GPL(sata_pmp_error_handler); 1023