drivers/ata/libata-pmp.c

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This source file includes following definitions.
sata_pmp_read
sata_pmp_write
sata_pmp_qc_defer_cmd_switch
sata_pmp_scr_read
sata_pmp_scr_write
sata_pmp_set_lpm
sata_pmp_read_gscr
sata_pmp_spec_rev_str
sata_pmp_configure
sata_pmp_init_links
sata_pmp_quirks
sata_pmp_attach
sata_pmp_detach
sata_pmp_same_pmp
sata_pmp_revalidate
sata_pmp_revalidate_quick
sata_pmp_eh_recover_pmp
sata_pmp_eh_handle_disabled_links
sata_pmp_handle_link_fail
sata_pmp_eh_recover
sata_pmp_error_handler
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * libata-pmp.c - libata port multiplier support
   4  *
   5  * Copyright (c) 2007  SUSE Linux Products GmbH
   6  * Copyright (c) 2007  Tejun Heo <teheo@suse.de>
   7  */
   8 
   9 #include <linux/kernel.h>
  10 #include <linux/export.h>
  11 #include <linux/libata.h>
  12 #include <linux/slab.h>
  13 #include "libata.h"
  14 #include "libata-transport.h"
  15 
  16 const struct ata_port_operations sata_pmp_port_ops = {
  17         .inherits               = &sata_port_ops,
  18         .pmp_prereset           = ata_std_prereset,
  19         .pmp_hardreset          = sata_std_hardreset,
  20         .pmp_postreset          = ata_std_postreset,
  21         .error_handler          = sata_pmp_error_handler,
  22 };
  23 
  24 /**
  25  *      sata_pmp_read - read PMP register
  26  *      @link: link to read PMP register for
  27  *      @reg: register to read
  28  *      @r_val: resulting value
  29  *
  30  *      Read PMP register.
  31  *
  32  *      LOCKING:
  33  *      Kernel thread context (may sleep).
  34  *
  35  *      RETURNS:
  36  *      0 on success, AC_ERR_* mask on failure.
  37  */
  38 static unsigned int sata_pmp_read(struct ata_link *link, int reg, u32 *r_val)
  39 {
  40         struct ata_port *ap = link->ap;
  41         struct ata_device *pmp_dev = ap->link.device;
  42         struct ata_taskfile tf;
  43         unsigned int err_mask;
  44 
  45         ata_tf_init(pmp_dev, &tf);
  46         tf.command = ATA_CMD_PMP_READ;
  47         tf.protocol = ATA_PROT_NODATA;
  48         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
  49         tf.feature = reg;
  50         tf.device = link->pmp;
  51 
  52         err_mask = ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
  53                                      SATA_PMP_RW_TIMEOUT);
  54         if (err_mask)
  55                 return err_mask;
  56 
  57         *r_val = tf.nsect | tf.lbal << 8 | tf.lbam << 16 | tf.lbah << 24;
  58         return 0;
  59 }
  60 
  61 /**
  62  *      sata_pmp_write - write PMP register
  63  *      @link: link to write PMP register for
  64  *      @reg: register to write
  65  *      @r_val: value to write
  66  *
  67  *      Write PMP register.
  68  *
  69  *      LOCKING:
  70  *      Kernel thread context (may sleep).
  71  *
  72  *      RETURNS:
  73  *      0 on success, AC_ERR_* mask on failure.
  74  */
  75 static unsigned int sata_pmp_write(struct ata_link *link, int reg, u32 val)
  76 {
  77         struct ata_port *ap = link->ap;
  78         struct ata_device *pmp_dev = ap->link.device;
  79         struct ata_taskfile tf;
  80 
  81         ata_tf_init(pmp_dev, &tf);
  82         tf.command = ATA_CMD_PMP_WRITE;
  83         tf.protocol = ATA_PROT_NODATA;
  84         tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
  85         tf.feature = reg;
  86         tf.device = link->pmp;
  87         tf.nsect = val & 0xff;
  88         tf.lbal = (val >> 8) & 0xff;
  89         tf.lbam = (val >> 16) & 0xff;
  90         tf.lbah = (val >> 24) & 0xff;
  91 
  92         return ata_exec_internal(pmp_dev, &tf, NULL, DMA_NONE, NULL, 0,
  93                                  SATA_PMP_RW_TIMEOUT);
  94 }
  95 
  96 /**
  97  *      sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
  98  *      @qc: ATA command in question
  99  *
 100  *      A host which has command switching PMP support cannot issue
 101  *      commands to multiple links simultaneously.
 102  *
 103  *      LOCKING:
 104  *      spin_lock_irqsave(host lock)
 105  *
 106  *      RETURNS:
 107  *      ATA_DEFER_* if deferring is needed, 0 otherwise.
 108  */
 109 int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
 110 {
 111         struct ata_link *link = qc->dev->link;
 112         struct ata_port *ap = link->ap;
 113 
 114         if (ap->excl_link == NULL || ap->excl_link == link) {
 115                 if (ap->nr_active_links == 0 || ata_link_active(link)) {
 116                         qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
 117                         return ata_std_qc_defer(qc);
 118                 }
 119 
 120                 ap->excl_link = link;
 121         }
 122 
 123         return ATA_DEFER_PORT;
 124 }
 125 
 126 /**
 127  *      sata_pmp_scr_read - read PSCR
 128  *      @link: ATA link to read PSCR for
 129  *      @reg: PSCR to read
 130  *      @r_val: resulting value
 131  *
 132  *      Read PSCR @reg into @r_val for @link, to be called from
 133  *      ata_scr_read().
 134  *
 135  *      LOCKING:
 136  *      Kernel thread context (may sleep).
 137  *
 138  *      RETURNS:
 139  *      0 on success, -errno on failure.
 140  */
 141 int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *r_val)
 142 {
 143         unsigned int err_mask;
 144 
 145         if (reg > SATA_PMP_PSCR_CONTROL)
 146                 return -EINVAL;
 147 
 148         err_mask = sata_pmp_read(link, reg, r_val);
 149         if (err_mask) {
 150                 ata_link_warn(link, "failed to read SCR %d (Emask=0x%x)\n",
 151                               reg, err_mask);
 152                 return -EIO;
 153         }
 154         return 0;
 155 }
 156 
 157 /**
 158  *      sata_pmp_scr_write - write PSCR
 159  *      @link: ATA link to write PSCR for
 160  *      @reg: PSCR to write
 161  *      @val: value to be written
 162  *
 163  *      Write @val to PSCR @reg for @link, to be called from
 164  *      ata_scr_write() and ata_scr_write_flush().
 165  *
 166  *      LOCKING:
 167  *      Kernel thread context (may sleep).
 168  *
 169  *      RETURNS:
 170  *      0 on success, -errno on failure.
 171  */
 172 int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
 173 {
 174         unsigned int err_mask;
 175 
 176         if (reg > SATA_PMP_PSCR_CONTROL)
 177                 return -EINVAL;
 178 
 179         err_mask = sata_pmp_write(link, reg, val);
 180         if (err_mask) {
 181                 ata_link_warn(link, "failed to write SCR %d (Emask=0x%x)\n",
 182                               reg, err_mask);
 183                 return -EIO;
 184         }
 185         return 0;
 186 }
 187 
 188 /**
 189  *      sata_pmp_set_lpm - configure LPM for a PMP link
 190  *      @link: PMP link to configure LPM for
 191  *      @policy: target LPM policy
 192  *      @hints: LPM hints
 193  *
 194  *      Configure LPM for @link.  This function will contain any PMP
 195  *      specific workarounds if necessary.
 196  *
 197  *      LOCKING:
 198  *      EH context.
 199  *
 200  *      RETURNS:
 201  *      0 on success, -errno on failure.
 202  */
 203 int sata_pmp_set_lpm(struct ata_link *link, enum ata_lpm_policy policy,
 204                      unsigned hints)
 205 {
 206         return sata_link_scr_lpm(link, policy, true);
 207 }
 208 
 209 /**
 210  *      sata_pmp_read_gscr - read GSCR block of SATA PMP
 211  *      @dev: PMP device
 212  *      @gscr: buffer to read GSCR block into
 213  *
 214  *      Read selected PMP GSCRs from the PMP at @dev.  This will serve
 215  *      as configuration and identification info for the PMP.
 216  *
 217  *      LOCKING:
 218  *      Kernel thread context (may sleep).
 219  *
 220  *      RETURNS:
 221  *      0 on success, -errno on failure.
 222  */
 223 static int sata_pmp_read_gscr(struct ata_device *dev, u32 *gscr)
 224 {
 225         static const int gscr_to_read[] = { 0, 1, 2, 32, 33, 64, 96 };
 226         int i;
 227 
 228         for (i = 0; i < ARRAY_SIZE(gscr_to_read); i++) {
 229                 int reg = gscr_to_read[i];
 230                 unsigned int err_mask;
 231 
 232                 err_mask = sata_pmp_read(dev->link, reg, &gscr[reg]);
 233                 if (err_mask) {
 234                         ata_dev_err(dev, "failed to read PMP GSCR[%d] (Emask=0x%x)\n",
 235                                     reg, err_mask);
 236                         return -EIO;
 237                 }
 238         }
 239 
 240         return 0;
 241 }
 242 
 243 static const char *sata_pmp_spec_rev_str(const u32 *gscr)
 244 {
 245         u32 rev = gscr[SATA_PMP_GSCR_REV];
 246 
 247         if (rev & (1 << 3))
 248                 return "1.2";
 249         if (rev & (1 << 2))
 250                 return "1.1";
 251         if (rev & (1 << 1))
 252                 return "1.0";
 253         return "<unknown>";
 254 }
 255 
 256 #define PMP_GSCR_SII_POL 129
 257 
 258 static int sata_pmp_configure(struct ata_device *dev, int print_info)
 259 {
 260         struct ata_port *ap = dev->link->ap;
 261         u32 *gscr = dev->gscr;
 262         u16 vendor = sata_pmp_gscr_vendor(gscr);
 263         u16 devid = sata_pmp_gscr_devid(gscr);
 264         unsigned int err_mask = 0;
 265         const char *reason;
 266         int nr_ports, rc;
 267 
 268         nr_ports = sata_pmp_gscr_ports(gscr);
 269 
 270         if (nr_ports <= 0 || nr_ports > SATA_PMP_MAX_PORTS) {
 271                 rc = -EINVAL;
 272                 reason = "invalid nr_ports";
 273                 goto fail;
 274         }
 275 
 276         if ((ap->flags & ATA_FLAG_AN) &&
 277             (gscr[SATA_PMP_GSCR_FEAT] & SATA_PMP_FEAT_NOTIFY))
 278                 dev->flags |= ATA_DFLAG_AN;
 279 
 280         /* monitor SERR_PHYRDY_CHG on fan-out ports */
 281         err_mask = sata_pmp_write(dev->link, SATA_PMP_GSCR_ERROR_EN,
 282                                   SERR_PHYRDY_CHG);
 283         if (err_mask) {
 284                 rc = -EIO;
 285                 reason = "failed to write GSCR_ERROR_EN";
 286                 goto fail;
 287         }
 288 
 289         /* Disable sending Early R_OK.
 290          * With "cached read" HDD testing and multiple ports busy on a SATA
 291          * host controller, 3x26 PMP will very rarely drop a deferred
 292          * R_OK that was intended for the host. Symptom will be all
 293          * 5 drives under test will timeout, get reset, and recover.
 294          */
 295         if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
 296                 u32 reg;
 297 
 298                 err_mask = sata_pmp_read(&ap->link, PMP_GSCR_SII_POL, &reg);
 299                 if (err_mask) {
 300                         rc = -EIO;
 301                         reason = "failed to read Sil3x26 Private Register";
 302                         goto fail;
 303                 }
 304                 reg &= ~0x1;
 305                 err_mask = sata_pmp_write(&ap->link, PMP_GSCR_SII_POL, reg);
 306                 if (err_mask) {
 307                         rc = -EIO;
 308                         reason = "failed to write Sil3x26 Private Register";
 309                         goto fail;
 310                 }
 311         }
 312 
 313         if (print_info) {
 314                 ata_dev_info(dev, "Port Multiplier %s, "
 315                              "0x%04x:0x%04x r%d, %d ports, feat 0x%x/0x%x\n",
 316                              sata_pmp_spec_rev_str(gscr), vendor, devid,
 317                              sata_pmp_gscr_rev(gscr),
 318                              nr_ports, gscr[SATA_PMP_GSCR_FEAT_EN],
 319                              gscr[SATA_PMP_GSCR_FEAT]);
 320 
 321                 if (!(dev->flags & ATA_DFLAG_AN))
 322                         ata_dev_info(dev,
 323                                 "Asynchronous notification not supported, "
 324                                 "hotplug won't work on fan-out ports. Use warm-plug instead.\n");
 325         }
 326 
 327         return 0;
 328 
 329  fail:
 330         ata_dev_err(dev,
 331                     "failed to configure Port Multiplier (%s, Emask=0x%x)\n",
 332                     reason, err_mask);
 333         return rc;
 334 }
 335 
 336 static int sata_pmp_init_links (struct ata_port *ap, int nr_ports)
 337 {
 338         struct ata_link *pmp_link = ap->pmp_link;
 339         int i, err;
 340 
 341         if (!pmp_link) {
 342                 pmp_link = kcalloc(SATA_PMP_MAX_PORTS, sizeof(pmp_link[0]),
 343                                    GFP_NOIO);
 344                 if (!pmp_link)
 345                         return -ENOMEM;
 346 
 347                 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
 348                         ata_link_init(ap, &pmp_link[i], i);
 349 
 350                 ap->pmp_link = pmp_link;
 351 
 352                 for (i = 0; i < SATA_PMP_MAX_PORTS; i++) {
 353                         err = ata_tlink_add(&pmp_link[i]);
 354                         if (err) {
 355                                 goto err_tlink;
 356                         }
 357                 }
 358         }
 359 
 360         for (i = 0; i < nr_ports; i++) {
 361                 struct ata_link *link = &pmp_link[i];
 362                 struct ata_eh_context *ehc = &link->eh_context;
 363 
 364                 link->flags = 0;
 365                 ehc->i.probe_mask |= ATA_ALL_DEVICES;
 366                 ehc->i.action |= ATA_EH_RESET;
 367         }
 368 
 369         return 0;
 370   err_tlink:
 371         while (--i >= 0)
 372                 ata_tlink_delete(&pmp_link[i]);
 373         kfree(pmp_link);
 374         ap->pmp_link = NULL;
 375         return err;
 376 }
 377 
 378 static void sata_pmp_quirks(struct ata_port *ap)
 379 {
 380         u32 *gscr = ap->link.device->gscr;
 381         u16 vendor = sata_pmp_gscr_vendor(gscr);
 382         u16 devid = sata_pmp_gscr_devid(gscr);
 383         struct ata_link *link;
 384 
 385         if (vendor == 0x1095 && (devid == 0x3726 || devid == 0x3826)) {
 386                 /* sil3x26 quirks */
 387                 ata_for_each_link(link, ap, EDGE) {
 388                         /* link reports offline after LPM */
 389                         link->flags |= ATA_LFLAG_NO_LPM;
 390 
 391                         /*
 392                          * Class code report is unreliable and SRST times
 393                          * out under certain configurations.
 394                          */
 395                         if (link->pmp < 5)
 396                                 link->flags |= ATA_LFLAG_NO_SRST |
 397                                                ATA_LFLAG_ASSUME_ATA;
 398 
 399                         /* port 5 is for SEMB device and it doesn't like SRST */
 400                         if (link->pmp == 5)
 401                                 link->flags |= ATA_LFLAG_NO_SRST |
 402                                                ATA_LFLAG_ASSUME_SEMB;
 403                 }
 404         } else if (vendor == 0x1095 && devid == 0x4723) {
 405                 /*
 406                  * sil4723 quirks
 407                  *
 408                  * Link reports offline after LPM.  Class code report is
 409                  * unreliable.  SIMG PMPs never got SRST reliable and the
 410                  * config device at port 2 locks up on SRST.
 411                  */
 412                 ata_for_each_link(link, ap, EDGE)
 413                         link->flags |= ATA_LFLAG_NO_LPM |
 414                                        ATA_LFLAG_NO_SRST |
 415                                        ATA_LFLAG_ASSUME_ATA;
 416         } else if (vendor == 0x1095 && devid == 0x4726) {
 417                 /* sil4726 quirks */
 418                 ata_for_each_link(link, ap, EDGE) {
 419                         /* link reports offline after LPM */
 420                         link->flags |= ATA_LFLAG_NO_LPM;
 421 
 422                         /* Class code report is unreliable and SRST
 423                          * times out under certain configurations.
 424                          * Config device can be at port 0 or 5 and
 425                          * locks up on SRST.
 426                          */
 427                         if (link->pmp <= 5)
 428                                 link->flags |= ATA_LFLAG_NO_SRST |
 429                                                ATA_LFLAG_ASSUME_ATA;
 430 
 431                         /* Port 6 is for SEMB device which doesn't
 432                          * like SRST either.
 433                          */
 434                         if (link->pmp == 6)
 435                                 link->flags |= ATA_LFLAG_NO_SRST |
 436                                                ATA_LFLAG_ASSUME_SEMB;
 437                 }
 438         } else if (vendor == 0x1095 && (devid == 0x5723 || devid == 0x5733 ||
 439                                         devid == 0x5734 || devid == 0x5744)) {
 440                 /* sil5723/5744 quirks */
 441 
 442                 /* sil5723/5744 has either two or three downstream
 443                  * ports depending on operation mode.  The last port
 444                  * is empty if any actual IO device is available or
 445                  * occupied by a pseudo configuration device
 446                  * otherwise.  Don't try hard to recover it.
 447                  */
 448                 ap->pmp_link[ap->nr_pmp_links - 1].flags |= ATA_LFLAG_NO_RETRY;
 449         } else if (vendor == 0x197b && (devid == 0x2352 || devid == 0x0325)) {
 450                 /*
 451                  * 0x2352: found in Thermaltake BlackX Duet, jmicron JMB350?
 452                  * 0x0325: jmicron JMB394.
 453                  */
 454                 ata_for_each_link(link, ap, EDGE) {
 455                         /* SRST breaks detection and disks get misclassified
 456                          * LPM disabled to avoid potential problems
 457                          */
 458                         link->flags |= ATA_LFLAG_NO_LPM |
 459                                        ATA_LFLAG_NO_SRST |
 460                                        ATA_LFLAG_ASSUME_ATA;
 461                 }
 462         } else if (vendor == 0x11ab && devid == 0x4140) {
 463                 /* Marvell 4140 quirks */
 464                 ata_for_each_link(link, ap, EDGE) {
 465                         /* port 4 is for SEMB device and it doesn't like SRST */
 466                         if (link->pmp == 4)
 467                                 link->flags |= ATA_LFLAG_DISABLED;
 468                 }
 469         }
 470 }
 471 
 472 /**
 473  *      sata_pmp_attach - attach a SATA PMP device
 474  *      @dev: SATA PMP device to attach
 475  *
 476  *      Configure and attach SATA PMP device @dev.  This function is
 477  *      also responsible for allocating and initializing PMP links.
 478  *
 479  *      LOCKING:
 480  *      Kernel thread context (may sleep).
 481  *
 482  *      RETURNS:
 483  *      0 on success, -errno on failure.
 484  */
 485 int sata_pmp_attach(struct ata_device *dev)
 486 {
 487         struct ata_link *link = dev->link;
 488         struct ata_port *ap = link->ap;
 489         unsigned long flags;
 490         struct ata_link *tlink;
 491         int rc;
 492 
 493         /* is it hanging off the right place? */
 494         if (!sata_pmp_supported(ap)) {
 495                 ata_dev_err(dev, "host does not support Port Multiplier\n");
 496                 return -EINVAL;
 497         }
 498 
 499         if (!ata_is_host_link(link)) {
 500                 ata_dev_err(dev, "Port Multipliers cannot be nested\n");
 501                 return -EINVAL;
 502         }
 503 
 504         if (dev->devno) {
 505                 ata_dev_err(dev, "Port Multiplier must be the first device\n");
 506                 return -EINVAL;
 507         }
 508 
 509         WARN_ON(link->pmp != 0);
 510         link->pmp = SATA_PMP_CTRL_PORT;
 511 
 512         /* read GSCR block */
 513         rc = sata_pmp_read_gscr(dev, dev->gscr);
 514         if (rc)
 515                 goto fail;
 516 
 517         /* config PMP */
 518         rc = sata_pmp_configure(dev, 1);
 519         if (rc)
 520                 goto fail;
 521 
 522         rc = sata_pmp_init_links(ap, sata_pmp_gscr_ports(dev->gscr));
 523         if (rc) {
 524                 ata_dev_info(dev, "failed to initialize PMP links\n");
 525                 goto fail;
 526         }
 527 
 528         /* attach it */
 529         spin_lock_irqsave(ap->lock, flags);
 530         WARN_ON(ap->nr_pmp_links);
 531         ap->nr_pmp_links = sata_pmp_gscr_ports(dev->gscr);
 532         spin_unlock_irqrestore(ap->lock, flags);
 533 
 534         sata_pmp_quirks(ap);
 535 
 536         if (ap->ops->pmp_attach)
 537                 ap->ops->pmp_attach(ap);
 538 
 539         ata_for_each_link(tlink, ap, EDGE)
 540                 sata_link_init_spd(tlink);
 541 
 542         return 0;
 543 
 544  fail:
 545         link->pmp = 0;
 546         return rc;
 547 }
 548 
 549 /**
 550  *      sata_pmp_detach - detach a SATA PMP device
 551  *      @dev: SATA PMP device to detach
 552  *
 553  *      Detach SATA PMP device @dev.  This function is also
 554  *      responsible for deconfiguring PMP links.
 555  *
 556  *      LOCKING:
 557  *      Kernel thread context (may sleep).
 558  */
 559 static void sata_pmp_detach(struct ata_device *dev)
 560 {
 561         struct ata_link *link = dev->link;
 562         struct ata_port *ap = link->ap;
 563         struct ata_link *tlink;
 564         unsigned long flags;
 565 
 566         ata_dev_info(dev, "Port Multiplier detaching\n");
 567 
 568         WARN_ON(!ata_is_host_link(link) || dev->devno ||
 569                 link->pmp != SATA_PMP_CTRL_PORT);
 570 
 571         if (ap->ops->pmp_detach)
 572                 ap->ops->pmp_detach(ap);
 573 
 574         ata_for_each_link(tlink, ap, EDGE)
 575                 ata_eh_detach_dev(tlink->device);
 576 
 577         spin_lock_irqsave(ap->lock, flags);
 578         ap->nr_pmp_links = 0;
 579         link->pmp = 0;
 580         spin_unlock_irqrestore(ap->lock, flags);
 581 }
 582 
 583 /**
 584  *      sata_pmp_same_pmp - does new GSCR matches the configured PMP?
 585  *      @dev: PMP device to compare against
 586  *      @new_gscr: GSCR block of the new device
 587  *
 588  *      Compare @new_gscr against @dev and determine whether @dev is
 589  *      the PMP described by @new_gscr.
 590  *
 591  *      LOCKING:
 592  *      None.
 593  *
 594  *      RETURNS:
 595  *      1 if @dev matches @new_gscr, 0 otherwise.
 596  */
 597 static int sata_pmp_same_pmp(struct ata_device *dev, const u32 *new_gscr)
 598 {
 599         const u32 *old_gscr = dev->gscr;
 600         u16 old_vendor, new_vendor, old_devid, new_devid;
 601         int old_nr_ports, new_nr_ports;
 602 
 603         old_vendor = sata_pmp_gscr_vendor(old_gscr);
 604         new_vendor = sata_pmp_gscr_vendor(new_gscr);
 605         old_devid = sata_pmp_gscr_devid(old_gscr);
 606         new_devid = sata_pmp_gscr_devid(new_gscr);
 607         old_nr_ports = sata_pmp_gscr_ports(old_gscr);
 608         new_nr_ports = sata_pmp_gscr_ports(new_gscr);
 609 
 610         if (old_vendor != new_vendor) {
 611                 ata_dev_info(dev,
 612                              "Port Multiplier vendor mismatch '0x%x' != '0x%x'\n",
 613                              old_vendor, new_vendor);
 614                 return 0;
 615         }
 616 
 617         if (old_devid != new_devid) {
 618                 ata_dev_info(dev,
 619                              "Port Multiplier device ID mismatch '0x%x' != '0x%x'\n",
 620                              old_devid, new_devid);
 621                 return 0;
 622         }
 623 
 624         if (old_nr_ports != new_nr_ports) {
 625                 ata_dev_info(dev,
 626                              "Port Multiplier nr_ports mismatch '0x%x' != '0x%x'\n",
 627                              old_nr_ports, new_nr_ports);
 628                 return 0;
 629         }
 630 
 631         return 1;
 632 }
 633 
 634 /**
 635  *      sata_pmp_revalidate - revalidate SATA PMP
 636  *      @dev: PMP device to revalidate
 637  *      @new_class: new class code
 638  *
 639  *      Re-read GSCR block and make sure @dev is still attached to the
 640  *      port and properly configured.
 641  *
 642  *      LOCKING:
 643  *      Kernel thread context (may sleep).
 644  *
 645  *      RETURNS:
 646  *      0 on success, -errno otherwise.
 647  */
 648 static int sata_pmp_revalidate(struct ata_device *dev, unsigned int new_class)
 649 {
 650         struct ata_link *link = dev->link;
 651         struct ata_port *ap = link->ap;
 652         u32 *gscr = (void *)ap->sector_buf;
 653         int rc;
 654 
 655         DPRINTK("ENTER\n");
 656 
 657         ata_eh_about_to_do(link, NULL, ATA_EH_REVALIDATE);
 658 
 659         if (!ata_dev_enabled(dev)) {
 660                 rc = -ENODEV;
 661                 goto fail;
 662         }
 663 
 664         /* wrong class? */
 665         if (ata_class_enabled(new_class) && new_class != ATA_DEV_PMP) {
 666                 rc = -ENODEV;
 667                 goto fail;
 668         }
 669 
 670         /* read GSCR */
 671         rc = sata_pmp_read_gscr(dev, gscr);
 672         if (rc)
 673                 goto fail;
 674 
 675         /* is the pmp still there? */
 676         if (!sata_pmp_same_pmp(dev, gscr)) {
 677                 rc = -ENODEV;
 678                 goto fail;
 679         }
 680 
 681         memcpy(dev->gscr, gscr, sizeof(gscr[0]) * SATA_PMP_GSCR_DWORDS);
 682 
 683         rc = sata_pmp_configure(dev, 0);
 684         if (rc)
 685                 goto fail;
 686 
 687         ata_eh_done(link, NULL, ATA_EH_REVALIDATE);
 688 
 689         DPRINTK("EXIT, rc=0\n");
 690         return 0;
 691 
 692  fail:
 693         ata_dev_err(dev, "PMP revalidation failed (errno=%d)\n", rc);
 694         DPRINTK("EXIT, rc=%d\n", rc);
 695         return rc;
 696 }
 697 
 698 /**
 699  *      sata_pmp_revalidate_quick - revalidate SATA PMP quickly
 700  *      @dev: PMP device to revalidate
 701  *
 702  *      Make sure the attached PMP is accessible.
 703  *
 704  *      LOCKING:
 705  *      Kernel thread context (may sleep).
 706  *
 707  *      RETURNS:
 708  *      0 on success, -errno otherwise.
 709  */
 710 static int sata_pmp_revalidate_quick(struct ata_device *dev)
 711 {
 712         unsigned int err_mask;
 713         u32 prod_id;
 714 
 715         err_mask = sata_pmp_read(dev->link, SATA_PMP_GSCR_PROD_ID, &prod_id);
 716         if (err_mask) {
 717                 ata_dev_err(dev,
 718                             "failed to read PMP product ID (Emask=0x%x)\n",
 719                             err_mask);
 720                 return -EIO;
 721         }
 722 
 723         if (prod_id != dev->gscr[SATA_PMP_GSCR_PROD_ID]) {
 724                 ata_dev_err(dev, "PMP product ID mismatch\n");
 725                 /* something weird is going on, request full PMP recovery */
 726                 return -EIO;
 727         }
 728 
 729         return 0;
 730 }
 731 
 732 /**
 733  *      sata_pmp_eh_recover_pmp - recover PMP
 734  *      @ap: ATA port PMP is attached to
 735  *      @prereset: prereset method (can be NULL)
 736  *      @softreset: softreset method
 737  *      @hardreset: hardreset method
 738  *      @postreset: postreset method (can be NULL)
 739  *
 740  *      Recover PMP attached to @ap.  Recovery procedure is somewhat
 741  *      similar to that of ata_eh_recover() except that reset should
 742  *      always be performed in hard->soft sequence and recovery
 743  *      failure results in PMP detachment.
 744  *
 745  *      LOCKING:
 746  *      Kernel thread context (may sleep).
 747  *
 748  *      RETURNS:
 749  *      0 on success, -errno on failure.
 750  */
 751 static int sata_pmp_eh_recover_pmp(struct ata_port *ap,
 752                 ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
 753                 ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
 754 {
 755         struct ata_link *link = &ap->link;
 756         struct ata_eh_context *ehc = &link->eh_context;
 757         struct ata_device *dev = link->device;
 758         int tries = ATA_EH_PMP_TRIES;
 759         int detach = 0, rc = 0;
 760         int reval_failed = 0;
 761 
 762         DPRINTK("ENTER\n");
 763 
 764         if (dev->flags & ATA_DFLAG_DETACH) {
 765                 detach = 1;
 766                 rc = -ENODEV;
 767                 goto fail;
 768         }
 769 
 770  retry:
 771         ehc->classes[0] = ATA_DEV_UNKNOWN;
 772 
 773         if (ehc->i.action & ATA_EH_RESET) {
 774                 struct ata_link *tlink;
 775 
 776                 /* reset */
 777                 rc = ata_eh_reset(link, 0, prereset, softreset, hardreset,
 778                                   postreset);
 779                 if (rc) {
 780                         ata_link_err(link, "failed to reset PMP, giving up\n");
 781                         goto fail;
 782                 }
 783 
 784                 /* PMP is reset, SErrors cannot be trusted, scan all */
 785                 ata_for_each_link(tlink, ap, EDGE) {
 786                         struct ata_eh_context *ehc = &tlink->eh_context;
 787 
 788                         ehc->i.probe_mask |= ATA_ALL_DEVICES;
 789                         ehc->i.action |= ATA_EH_RESET;
 790                 }
 791         }
 792 
 793         /* If revalidation is requested, revalidate and reconfigure;
 794          * otherwise, do quick revalidation.
 795          */
 796         if (ehc->i.action & ATA_EH_REVALIDATE)
 797                 rc = sata_pmp_revalidate(dev, ehc->classes[0]);
 798         else
 799                 rc = sata_pmp_revalidate_quick(dev);
 800 
 801         if (rc) {
 802                 tries--;
 803 
 804                 if (rc == -ENODEV) {
 805                         ehc->i.probe_mask |= ATA_ALL_DEVICES;
 806                         detach = 1;
 807                         /* give it just two more chances */
 808                         tries = min(tries, 2);
 809                 }
 810 
 811                 if (tries) {
 812                         /* consecutive revalidation failures? speed down */
 813                         if (reval_failed)
 814                                 sata_down_spd_limit(link, 0);
 815                         else
 816                                 reval_failed = 1;
 817 
 818                         ehc->i.action |= ATA_EH_RESET;
 819                         goto retry;
 820                 } else {
 821                         ata_dev_err(dev,
 822                                     "failed to recover PMP after %d tries, giving up\n",
 823                                     ATA_EH_PMP_TRIES);
 824                         goto fail;
 825                 }
 826         }
 827 
 828         /* okay, PMP resurrected */
 829         ehc->i.flags = 0;
 830 
 831         DPRINTK("EXIT, rc=0\n");
 832         return 0;
 833 
 834  fail:
 835         sata_pmp_detach(dev);
 836         if (detach)
 837                 ata_eh_detach_dev(dev);
 838         else
 839                 ata_dev_disable(dev);
 840 
 841         DPRINTK("EXIT, rc=%d\n", rc);
 842         return rc;
 843 }
 844 
 845 static int sata_pmp_eh_handle_disabled_links(struct ata_port *ap)
 846 {
 847         struct ata_link *link;
 848         unsigned long flags;
 849         int rc;
 850 
 851         spin_lock_irqsave(ap->lock, flags);
 852 
 853         ata_for_each_link(link, ap, EDGE) {
 854                 if (!(link->flags & ATA_LFLAG_DISABLED))
 855                         continue;
 856 
 857                 spin_unlock_irqrestore(ap->lock, flags);
 858 
 859                 /* Some PMPs require hardreset sequence to get
 860                  * SError.N working.
 861                  */
 862                 sata_link_hardreset(link, sata_deb_timing_normal,
 863                                 ata_deadline(jiffies, ATA_TMOUT_INTERNAL_QUICK),
 864                                 NULL, NULL);
 865 
 866                 /* unconditionally clear SError.N */
 867                 rc = sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
 868                 if (rc) {
 869                         ata_link_err(link,
 870                                      "failed to clear SError.N (errno=%d)\n",
 871                                      rc);
 872                         return rc;
 873                 }
 874 
 875                 spin_lock_irqsave(ap->lock, flags);
 876         }
 877 
 878         spin_unlock_irqrestore(ap->lock, flags);
 879 
 880         return 0;
 881 }
 882 
 883 static int sata_pmp_handle_link_fail(struct ata_link *link, int *link_tries)
 884 {
 885         struct ata_port *ap = link->ap;
 886         unsigned long flags;
 887 
 888         if (link_tries[link->pmp] && --link_tries[link->pmp])
 889                 return 1;
 890 
 891         /* disable this link */
 892         if (!(link->flags & ATA_LFLAG_DISABLED)) {
 893                 ata_link_warn(link,
 894                         "failed to recover link after %d tries, disabling\n",
 895                         ATA_EH_PMP_LINK_TRIES);
 896 
 897                 spin_lock_irqsave(ap->lock, flags);
 898                 link->flags |= ATA_LFLAG_DISABLED;
 899                 spin_unlock_irqrestore(ap->lock, flags);
 900         }
 901 
 902         ata_dev_disable(link->device);
 903         link->eh_context.i.action = 0;
 904 
 905         return 0;
 906 }
 907 
 908 /**
 909  *      sata_pmp_eh_recover - recover PMP-enabled port
 910  *      @ap: ATA port to recover
 911  *
 912  *      Drive EH recovery operation for PMP enabled port @ap.  This
 913  *      function recovers host and PMP ports with proper retrials and
 914  *      fallbacks.  Actual recovery operations are performed using
 915  *      ata_eh_recover() and sata_pmp_eh_recover_pmp().
 916  *
 917  *      LOCKING:
 918  *      Kernel thread context (may sleep).
 919  *
 920  *      RETURNS:
 921  *      0 on success, -errno on failure.
 922  */
 923 static int sata_pmp_eh_recover(struct ata_port *ap)
 924 {
 925         struct ata_port_operations *ops = ap->ops;
 926         int pmp_tries, link_tries[SATA_PMP_MAX_PORTS];
 927         struct ata_link *pmp_link = &ap->link;
 928         struct ata_device *pmp_dev = pmp_link->device;
 929         struct ata_eh_context *pmp_ehc = &pmp_link->eh_context;
 930         u32 *gscr = pmp_dev->gscr;
 931         struct ata_link *link;
 932         struct ata_device *dev;
 933         unsigned int err_mask;
 934         u32 gscr_error, sntf;
 935         int cnt, rc;
 936 
 937         pmp_tries = ATA_EH_PMP_TRIES;
 938         ata_for_each_link(link, ap, EDGE)
 939                 link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
 940 
 941  retry:
 942         /* PMP attached? */
 943         if (!sata_pmp_attached(ap)) {
 944                 rc = ata_eh_recover(ap, ops->prereset, ops->softreset,
 945                                     ops->hardreset, ops->postreset, NULL);
 946                 if (rc) {
 947                         ata_for_each_dev(dev, &ap->link, ALL)
 948                                 ata_dev_disable(dev);
 949                         return rc;
 950                 }
 951 
 952                 if (pmp_dev->class != ATA_DEV_PMP)
 953                         return 0;
 954 
 955                 /* new PMP online */
 956                 ata_for_each_link(link, ap, EDGE)
 957                         link_tries[link->pmp] = ATA_EH_PMP_LINK_TRIES;
 958 
 959                 /* fall through */
 960         }
 961 
 962         /* recover pmp */
 963         rc = sata_pmp_eh_recover_pmp(ap, ops->prereset, ops->softreset,
 964                                      ops->hardreset, ops->postreset);
 965         if (rc)
 966                 goto pmp_fail;
 967 
 968         /* PHY event notification can disturb reset and other recovery
 969          * operations.  Turn it off.
 970          */
 971         if (gscr[SATA_PMP_GSCR_FEAT_EN] & SATA_PMP_FEAT_NOTIFY) {
 972                 gscr[SATA_PMP_GSCR_FEAT_EN] &= ~SATA_PMP_FEAT_NOTIFY;
 973 
 974                 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
 975                                           gscr[SATA_PMP_GSCR_FEAT_EN]);
 976                 if (err_mask) {
 977                         ata_link_warn(pmp_link,
 978                                 "failed to disable NOTIFY (err_mask=0x%x)\n",
 979                                 err_mask);
 980                         goto pmp_fail;
 981                 }
 982         }
 983 
 984         /* handle disabled links */
 985         rc = sata_pmp_eh_handle_disabled_links(ap);
 986         if (rc)
 987                 goto pmp_fail;
 988 
 989         /* recover links */
 990         rc = ata_eh_recover(ap, ops->pmp_prereset, ops->pmp_softreset,
 991                             ops->pmp_hardreset, ops->pmp_postreset, &link);
 992         if (rc)
 993                 goto link_fail;
 994 
 995         /* clear SNotification */
 996         rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
 997         if (rc == 0)
 998                 sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);
 999 
1000         /*
1001          * If LPM is active on any fan-out port, hotplug wouldn't
1002          * work.  Return w/ PHY event notification disabled.
1003          */
1004         ata_for_each_link(link, ap, EDGE)
1005                 if (link->lpm_policy > ATA_LPM_MAX_POWER)
1006                         return 0;
1007 
1008         /*
1009          * Connection status might have changed while resetting other
1010          * links, enable notification and check SATA_PMP_GSCR_ERROR
1011          * before returning.
1012          */
1013 
1014         /* enable notification */
1015         if (pmp_dev->flags & ATA_DFLAG_AN) {
1016                 gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
1017 
1018                 err_mask = sata_pmp_write(pmp_link, SATA_PMP_GSCR_FEAT_EN,
1019                                           gscr[SATA_PMP_GSCR_FEAT_EN]);
1020                 if (err_mask) {
1021                         ata_dev_err(pmp_dev,
1022                                     "failed to write PMP_FEAT_EN (Emask=0x%x)\n",
1023                                     err_mask);
1024                         rc = -EIO;
1025                         goto pmp_fail;
1026                 }
1027         }
1028 
1029         /* check GSCR_ERROR */
1030         err_mask = sata_pmp_read(pmp_link, SATA_PMP_GSCR_ERROR, &gscr_error);
1031         if (err_mask) {
1032                 ata_dev_err(pmp_dev,
1033                             "failed to read PMP_GSCR_ERROR (Emask=0x%x)\n",
1034                             err_mask);
1035                 rc = -EIO;
1036                 goto pmp_fail;
1037         }
1038 
1039         cnt = 0;
1040         ata_for_each_link(link, ap, EDGE) {
1041                 if (!(gscr_error & (1 << link->pmp)))
1042                         continue;
1043 
1044                 if (sata_pmp_handle_link_fail(link, link_tries)) {
1045                         ata_ehi_hotplugged(&link->eh_context.i);
1046                         cnt++;
1047                 } else {
1048                         ata_link_warn(link,
1049                                 "PHY status changed but maxed out on retries, giving up\n");
1050                         ata_link_warn(link,
1051                                 "Manually issue scan to resume this link\n");
1052                 }
1053         }
1054 
1055         if (cnt) {
1056                 ata_port_info(ap,
1057                         "PMP SError.N set for some ports, repeating recovery\n");
1058                 goto retry;
1059         }
1060 
1061         return 0;
1062 
1063  link_fail:
1064         if (sata_pmp_handle_link_fail(link, link_tries)) {
1065                 pmp_ehc->i.action |= ATA_EH_RESET;
1066                 goto retry;
1067         }
1068 
1069         /* fall through */
1070  pmp_fail:
1071         /* Control always ends up here after detaching PMP.  Shut up
1072          * and return if we're unloading.
1073          */
1074         if (ap->pflags & ATA_PFLAG_UNLOADING)
1075                 return rc;
1076 
1077         if (!sata_pmp_attached(ap))
1078                 goto retry;
1079 
1080         if (--pmp_tries) {
1081                 pmp_ehc->i.action |= ATA_EH_RESET;
1082                 goto retry;
1083         }
1084 
1085         ata_port_err(ap, "failed to recover PMP after %d tries, giving up\n",
1086                      ATA_EH_PMP_TRIES);
1087         sata_pmp_detach(pmp_dev);
1088         ata_dev_disable(pmp_dev);
1089 
1090         return rc;
1091 }
1092 
1093 /**
1094  *      sata_pmp_error_handler - do standard error handling for PMP-enabled host
1095  *      @ap: host port to handle error for
1096  *
1097  *      Perform standard error handling sequence for PMP-enabled host
1098  *      @ap.
1099  *
1100  *      LOCKING:
1101  *      Kernel thread context (may sleep).
1102  */
1103 void sata_pmp_error_handler(struct ata_port *ap)
1104 {
1105         ata_eh_autopsy(ap);
1106         ata_eh_report(ap);
1107         sata_pmp_eh_recover(ap);
1108         ata_eh_finish(ap);
1109 }
1110 
1111 EXPORT_SYMBOL_GPL(sata_pmp_port_ops);
1112 EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
1113 EXPORT_SYMBOL_GPL(sata_pmp_error_handler);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/ata/libata-pmp.c

DEFINITIONS
