drivers/scsi/libsas/sas_expander.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Serial Attached SCSI (SAS) Expander discovery and configuration
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  *
   8  * This file is licensed under GPLv2.
   9  */
  10
  11 #include <linux/scatterlist.h>
  12 #include <linux/blkdev.h>
  13 #include <linux/slab.h>
  14 #include <asm/unaligned.h>
  15
  16 #include "sas_internal.h"
  17
  18 #include <scsi/sas_ata.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_sas.h>
  21 #include "scsi_sas_internal.h"
  22
  23 static int sas_discover_expander(struct domain_device *dev);
  24 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  25 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  26                              u8 *sas_addr, int include);
  27 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  28
  29 /* ---------- SMP task management ---------- */
  30
  31 /* Give it some long enough timeout. In seconds. */
  32 #define SMP_TIMEOUT 10
  33
  34 static int smp_execute_task_sg(struct domain_device *dev,
  35                 struct scatterlist *req, struct scatterlist *resp)
  36 {
  37         int res, retry;
  38         struct sas_task *task = NULL;
  39         struct sas_internal *i =
  40                 to_sas_internal(dev->port->ha->core.shost->transportt);
  41         struct sas_ha_struct *ha = dev->port->ha;
  42
  43         pm_runtime_get_sync(ha->dev);
  44         mutex_lock(&dev->ex_dev.cmd_mutex);
  45         for (retry = 0; retry < 3; retry++) {
  46                 if (test_bit(SAS_DEV_GONE, &dev->state)) {
  47                         res = -ECOMM;
  48                         break;
  49                 }
  50
  51                 task = sas_alloc_slow_task(GFP_KERNEL);
  52                 if (!task) {
  53                         res = -ENOMEM;
  54                         break;
  55                 }
  56                 task->dev = dev;
  57                 task->task_proto = dev->tproto;
  58                 task->smp_task.smp_req = *req;
  59                 task->smp_task.smp_resp = *resp;
  60
  61                 task->task_done = sas_task_internal_done;
  62
  63                 task->slow_task->timer.function = sas_task_internal_timedout;
  64                 task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  65                 add_timer(&task->slow_task->timer);
  66
  67                 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
  68
  69                 if (res) {
  70                         del_timer_sync(&task->slow_task->timer);
  71                         pr_notice("executing SMP task failed:%d\n", res);
  72                         break;
  73                 }
  74
  75                 wait_for_completion(&task->slow_task->completion);
  76                 res = -ECOMM;
  77                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  78                         pr_notice("smp task timed out or aborted\n");
  79                         i->dft->lldd_abort_task(task);
  80                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
  81                                 pr_notice("SMP task aborted and not done\n");
  82                                 break;
  83                         }
  84                 }
  85                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
  86                     task->task_status.stat == SAS_SAM_STAT_GOOD) {
  87                         res = 0;
  88                         break;
  89                 }
  90                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
  91                     task->task_status.stat == SAS_DATA_UNDERRUN) {
  92                         /* no error, but return the number of bytes of
  93                          * underrun */
  94                         res = task->task_status.residual;
  95                         break;
  96                 }
  97                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
  98                     task->task_status.stat == SAS_DATA_OVERRUN) {
  99                         res = -EMSGSIZE;
 100                         break;
 101                 }
 102                 if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
 103                     task->task_status.stat == SAS_DEVICE_UNKNOWN)
 104                         break;
 105                 else {
 106                         pr_notice("%s: task to dev %016llx response: 0x%x status 0x%x\n",
 107                                   __func__,
 108                                   SAS_ADDR(dev->sas_addr),
 109                                   task->task_status.resp,
 110                                   task->task_status.stat);
 111                         sas_free_task(task);
 112                         task = NULL;
 113                 }
 114         }
 115         mutex_unlock(&dev->ex_dev.cmd_mutex);
 116         pm_runtime_put_sync(ha->dev);
 117
 118         BUG_ON(retry == 3 && task != NULL);
 119         sas_free_task(task);
 120         return res;
 121 }
 122
 123 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
 124                             void *resp, int resp_size)
 125 {
 126         struct scatterlist req_sg;
 127         struct scatterlist resp_sg;
 128
 129         sg_init_one(&req_sg, req, req_size);
 130         sg_init_one(&resp_sg, resp, resp_size);
 131         return smp_execute_task_sg(dev, &req_sg, &resp_sg);
 132 }
 133
 134 /* ---------- Allocations ---------- */
 135
 136 static inline void *alloc_smp_req(int size)
 137 {
 138         u8 *p = kzalloc(size, GFP_KERNEL);
 139         if (p)
 140                 p[0] = SMP_REQUEST;
 141         return p;
 142 }
 143
 144 static inline void *alloc_smp_resp(int size)
 145 {
 146         return kzalloc(size, GFP_KERNEL);
 147 }
 148
 149 static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
 150 {
 151         switch (phy->routing_attr) {
 152         case TABLE_ROUTING:
 153                 if (dev->ex_dev.t2t_supp)
 154                         return 'U';
 155                 else
 156                         return 'T';
 157         case DIRECT_ROUTING:
 158                 return 'D';
 159         case SUBTRACTIVE_ROUTING:
 160                 return 'S';
 161         default:
 162                 return '?';
 163         }
 164 }
 165
 166 static enum sas_device_type to_dev_type(struct discover_resp *dr)
 167 {
 168         /* This is detecting a failure to transmit initial dev to host
 169          * FIS as described in section J.5 of sas-2 r16
 170          */
 171         if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&
 172             dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
 173                 return SAS_SATA_PENDING;
 174         else
 175                 return dr->attached_dev_type;
 176 }
 177
 178 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 179                            struct smp_disc_resp *disc_resp)
 180 {
 181         enum sas_device_type dev_type;
 182         enum sas_linkrate linkrate;
 183         u8 sas_addr[SAS_ADDR_SIZE];
 184         struct discover_resp *dr = &disc_resp->disc;
 185         struct sas_ha_struct *ha = dev->port->ha;
 186         struct expander_device *ex = &dev->ex_dev;
 187         struct ex_phy *phy = &ex->ex_phy[phy_id];
 188         struct sas_rphy *rphy = dev->rphy;
 189         bool new_phy = !phy->phy;
 190         char *type;
 191
 192         if (new_phy) {
 193                 if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
 194                         return;
 195                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 196
 197                 /* FIXME: error_handling */
 198                 BUG_ON(!phy->phy);
 199         }
 200
 201         switch (disc_resp->result) {
 202         case SMP_RESP_PHY_VACANT:
 203                 phy->phy_state = PHY_VACANT;
 204                 break;
 205         default:
 206                 phy->phy_state = PHY_NOT_PRESENT;
 207                 break;
 208         case SMP_RESP_FUNC_ACC:
 209                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 210                 break;
 211         }
 212
 213         /* check if anything important changed to squelch debug */
 214         dev_type = phy->attached_dev_type;
 215         linkrate  = phy->linkrate;
 216         memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 217
 218         /* Handle vacant phy - rest of dr data is not valid so skip it */
 219         if (phy->phy_state == PHY_VACANT) {
 220                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 221                 phy->attached_dev_type = SAS_PHY_UNUSED;
 222                 if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
 223                         phy->phy_id = phy_id;
 224                         goto skip;
 225                 } else
 226                         goto out;
 227         }
 228
 229         phy->attached_dev_type = to_dev_type(dr);
 230         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 231                 goto out;
 232         phy->phy_id = phy_id;
 233         phy->linkrate = dr->linkrate;
 234         phy->attached_sata_host = dr->attached_sata_host;
 235         phy->attached_sata_dev  = dr->attached_sata_dev;
 236         phy->attached_sata_ps   = dr->attached_sata_ps;
 237         phy->attached_iproto = dr->iproto << 1;
 238         phy->attached_tproto = dr->tproto << 1;
 239         /* help some expanders that fail to zero sas_address in the 'no
 240          * device' case
 241          */
 242         if (phy->attached_dev_type == SAS_PHY_UNUSED ||
 243             phy->linkrate < SAS_LINK_RATE_1_5_GBPS)
 244                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 245         else
 246                 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 247         phy->attached_phy_id = dr->attached_phy_id;
 248         phy->phy_change_count = dr->change_count;
 249         phy->routing_attr = dr->routing_attr;
 250         phy->virtual = dr->virtual;
 251         phy->last_da_index = -1;
 252
 253         phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 254         phy->phy->identify.device_type = dr->attached_dev_type;
 255         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 256         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 257         if (!phy->attached_tproto && dr->attached_sata_dev)
 258                 phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
 259         phy->phy->identify.phy_identifier = phy_id;
 260         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 261         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 262         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 263         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 264         phy->phy->negotiated_linkrate = phy->linkrate;
 265         phy->phy->enabled = (phy->linkrate != SAS_PHY_DISABLED);
 266
 267  skip:
 268         if (new_phy)
 269                 if (sas_phy_add(phy->phy)) {
 270                         sas_phy_free(phy->phy);
 271                         return;
 272                 }
 273
 274  out:
 275         switch (phy->attached_dev_type) {
 276         case SAS_SATA_PENDING:
 277                 type = "stp pending";
 278                 break;
 279         case SAS_PHY_UNUSED:
 280                 type = "no device";
 281                 break;
 282         case SAS_END_DEVICE:
 283                 if (phy->attached_iproto) {
 284                         if (phy->attached_tproto)
 285                                 type = "host+target";
 286                         else
 287                                 type = "host";
 288                 } else {
 289                         if (dr->attached_sata_dev)
 290                                 type = "stp";
 291                         else
 292                                 type = "ssp";
 293                 }
 294                 break;
 295         case SAS_EDGE_EXPANDER_DEVICE:
 296         case SAS_FANOUT_EXPANDER_DEVICE:
 297                 type = "smp";
 298                 break;
 299         default:
 300                 type = "unknown";
 301         }
 302
 303         /* this routine is polled by libata error recovery so filter
 304          * unimportant messages
 305          */
 306         if (new_phy || phy->attached_dev_type != dev_type ||
 307             phy->linkrate != linkrate ||
 308             SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
 309                 /* pass */;
 310         else
 311                 return;
 312
 313         /* if the attached device type changed and ata_eh is active,
 314          * make sure we run revalidation when eh completes (see:
 315          * sas_enable_revalidation)
 316          */
 317         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 318                 set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
 319
 320         pr_debug("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
 321                  test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
 322                  SAS_ADDR(dev->sas_addr), phy->phy_id,
 323                  sas_route_char(dev, phy), phy->linkrate,
 324                  SAS_ADDR(phy->attached_sas_addr), type);
 325 }
 326
 327 /* check if we have an existing attached ata device on this expander phy */
 328 struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
 329 {
 330         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
 331         struct domain_device *dev;
 332         struct sas_rphy *rphy;
 333
 334         if (!ex_phy->port)
 335                 return NULL;
 336
 337         rphy = ex_phy->port->rphy;
 338         if (!rphy)
 339                 return NULL;
 340
 341         dev = sas_find_dev_by_rphy(rphy);
 342
 343         if (dev && dev_is_sata(dev))
 344                 return dev;
 345
 346         return NULL;
 347 }
 348
 349 #define DISCOVER_REQ_SIZE  16
 350 #define DISCOVER_RESP_SIZE sizeof(struct smp_disc_resp)
 351
 352 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 353                                       struct smp_disc_resp *disc_resp,
 354                                       int single)
 355 {
 356         struct discover_resp *dr = &disc_resp->disc;
 357         int res;
 358
 359         disc_req[9] = single;
 360
 361         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 362                                disc_resp, DISCOVER_RESP_SIZE);
 363         if (res)
 364                 return res;
 365         if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
 366                 pr_notice("Found loopback topology, just ignore it!\n");
 367                 return 0;
 368         }
 369         sas_set_ex_phy(dev, single, disc_resp);
 370         return 0;
 371 }
 372
 373 int sas_ex_phy_discover(struct domain_device *dev, int single)
 374 {
 375         struct expander_device *ex = &dev->ex_dev;
 376         int  res = 0;
 377         u8   *disc_req;
 378         struct smp_disc_resp *disc_resp;
 379
 380         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 381         if (!disc_req)
 382                 return -ENOMEM;
 383
 384         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
 385         if (!disc_resp) {
 386                 kfree(disc_req);
 387                 return -ENOMEM;
 388         }
 389
 390         disc_req[1] = SMP_DISCOVER;
 391
 392         if (0 <= single && single < ex->num_phys) {
 393                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 394         } else {
 395                 int i;
 396
 397                 for (i = 0; i < ex->num_phys; i++) {
 398                         res = sas_ex_phy_discover_helper(dev, disc_req,
 399                                                          disc_resp, i);
 400                         if (res)
 401                                 goto out_err;
 402                 }
 403         }
 404 out_err:
 405         kfree(disc_resp);
 406         kfree(disc_req);
 407         return res;
 408 }
 409
 410 static int sas_expander_discover(struct domain_device *dev)
 411 {
 412         struct expander_device *ex = &dev->ex_dev;
 413         int res;
 414
 415         ex->ex_phy = kcalloc(ex->num_phys, sizeof(*ex->ex_phy), GFP_KERNEL);
 416         if (!ex->ex_phy)
 417                 return -ENOMEM;
 418
 419         res = sas_ex_phy_discover(dev, -1);
 420         if (res)
 421                 goto out_err;
 422
 423         return 0;
 424  out_err:
 425         kfree(ex->ex_phy);
 426         ex->ex_phy = NULL;
 427         return res;
 428 }
 429
 430 #define MAX_EXPANDER_PHYS 128
 431
 432 #define RG_REQ_SIZE   8
 433 #define RG_RESP_SIZE  sizeof(struct smp_rg_resp)
 434
 435 static int sas_ex_general(struct domain_device *dev)
 436 {
 437         u8 *rg_req;
 438         struct smp_rg_resp *rg_resp;
 439         struct report_general_resp *rg;
 440         int res;
 441         int i;
 442
 443         rg_req = alloc_smp_req(RG_REQ_SIZE);
 444         if (!rg_req)
 445                 return -ENOMEM;
 446
 447         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 448         if (!rg_resp) {
 449                 kfree(rg_req);
 450                 return -ENOMEM;
 451         }
 452
 453         rg_req[1] = SMP_REPORT_GENERAL;
 454
 455         for (i = 0; i < 5; i++) {
 456                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 457                                        RG_RESP_SIZE);
 458
 459                 if (res) {
 460                         pr_notice("RG to ex %016llx failed:0x%x\n",
 461                                   SAS_ADDR(dev->sas_addr), res);
 462                         goto out;
 463                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 464                         pr_debug("RG:ex %016llx returned SMP result:0x%x\n",
 465                                  SAS_ADDR(dev->sas_addr), rg_resp->result);
 466                         res = rg_resp->result;
 467                         goto out;
 468                 }
 469
 470                 rg = &rg_resp->rg;
 471                 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 472                 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 473                 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 474                 dev->ex_dev.t2t_supp = rg->t2t_supp;
 475                 dev->ex_dev.conf_route_table = rg->conf_route_table;
 476                 dev->ex_dev.configuring = rg->configuring;
 477                 memcpy(dev->ex_dev.enclosure_logical_id,
 478                        rg->enclosure_logical_id, 8);
 479
 480                 if (dev->ex_dev.configuring) {
 481                         pr_debug("RG: ex %016llx self-configuring...\n",
 482                                  SAS_ADDR(dev->sas_addr));
 483                         schedule_timeout_interruptible(5*HZ);
 484                 } else
 485                         break;
 486         }
 487 out:
 488         kfree(rg_req);
 489         kfree(rg_resp);
 490         return res;
 491 }
 492
 493 static void ex_assign_manuf_info(struct domain_device *dev, void
 494                                         *_mi_resp)
 495 {
 496         u8 *mi_resp = _mi_resp;
 497         struct sas_rphy *rphy = dev->rphy;
 498         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 499
 500         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 501         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 502         memcpy(edev->product_rev, mi_resp + 36,
 503                SAS_EXPANDER_PRODUCT_REV_LEN);
 504
 505         if (mi_resp[8] & 1) {
 506                 memcpy(edev->component_vendor_id, mi_resp + 40,
 507                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 508                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 509                 edev->component_revision_id = mi_resp[50];
 510         }
 511 }
 512
 513 #define MI_REQ_SIZE   8
 514 #define MI_RESP_SIZE 64
 515
 516 static int sas_ex_manuf_info(struct domain_device *dev)
 517 {
 518         u8 *mi_req;
 519         u8 *mi_resp;
 520         int res;
 521
 522         mi_req = alloc_smp_req(MI_REQ_SIZE);
 523         if (!mi_req)
 524                 return -ENOMEM;
 525
 526         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 527         if (!mi_resp) {
 528                 kfree(mi_req);
 529                 return -ENOMEM;
 530         }
 531
 532         mi_req[1] = SMP_REPORT_MANUF_INFO;
 533
 534         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp, MI_RESP_SIZE);
 535         if (res) {
 536                 pr_notice("MI: ex %016llx failed:0x%x\n",
 537                           SAS_ADDR(dev->sas_addr), res);
 538                 goto out;
 539         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 540                 pr_debug("MI ex %016llx returned SMP result:0x%x\n",
 541                          SAS_ADDR(dev->sas_addr), mi_resp[2]);
 542                 goto out;
 543         }
 544
 545         ex_assign_manuf_info(dev, mi_resp);
 546 out:
 547         kfree(mi_req);
 548         kfree(mi_resp);
 549         return res;
 550 }
 551
 552 #define PC_REQ_SIZE  44
 553 #define PC_RESP_SIZE 8
 554
 555 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 556                         enum phy_func phy_func,
 557                         struct sas_phy_linkrates *rates)
 558 {
 559         u8 *pc_req;
 560         u8 *pc_resp;
 561         int res;
 562
 563         pc_req = alloc_smp_req(PC_REQ_SIZE);
 564         if (!pc_req)
 565                 return -ENOMEM;
 566
 567         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 568         if (!pc_resp) {
 569                 kfree(pc_req);
 570                 return -ENOMEM;
 571         }
 572
 573         pc_req[1] = SMP_PHY_CONTROL;
 574         pc_req[9] = phy_id;
 575         pc_req[10] = phy_func;
 576         if (rates) {
 577                 pc_req[32] = rates->minimum_linkrate << 4;
 578                 pc_req[33] = rates->maximum_linkrate << 4;
 579         }
 580
 581         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp, PC_RESP_SIZE);
 582         if (res) {
 583                 pr_err("ex %016llx phy%02d PHY control failed: %d\n",
 584                        SAS_ADDR(dev->sas_addr), phy_id, res);
 585         } else if (pc_resp[2] != SMP_RESP_FUNC_ACC) {
 586                 pr_err("ex %016llx phy%02d PHY control failed: function result 0x%x\n",
 587                        SAS_ADDR(dev->sas_addr), phy_id, pc_resp[2]);
 588                 res = pc_resp[2];
 589         }
 590         kfree(pc_resp);
 591         kfree(pc_req);
 592         return res;
 593 }
 594
 595 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 596 {
 597         struct expander_device *ex = &dev->ex_dev;
 598         struct ex_phy *phy = &ex->ex_phy[phy_id];
 599
 600         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 601         phy->linkrate = SAS_PHY_DISABLED;
 602 }
 603
 604 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 605 {
 606         struct expander_device *ex = &dev->ex_dev;
 607         int i;
 608
 609         for (i = 0; i < ex->num_phys; i++) {
 610                 struct ex_phy *phy = &ex->ex_phy[i];
 611
 612                 if (phy->phy_state == PHY_VACANT ||
 613                     phy->phy_state == PHY_NOT_PRESENT)
 614                         continue;
 615
 616                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 617                         sas_ex_disable_phy(dev, i);
 618         }
 619 }
 620
 621 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 622                                             u8 *sas_addr)
 623 {
 624         struct domain_device *dev;
 625
 626         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 627                 return 1;
 628         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 629                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 630                         return 1;
 631         }
 632         return 0;
 633 }
 634
 635 #define RPEL_REQ_SIZE   16
 636 #define RPEL_RESP_SIZE  32
 637 int sas_smp_get_phy_events(struct sas_phy *phy)
 638 {
 639         int res;
 640         u8 *req;
 641         u8 *resp;
 642         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 643         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 644
 645         req = alloc_smp_req(RPEL_REQ_SIZE);
 646         if (!req)
 647                 return -ENOMEM;
 648
 649         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 650         if (!resp) {
 651                 kfree(req);
 652                 return -ENOMEM;
 653         }
 654
 655         req[1] = SMP_REPORT_PHY_ERR_LOG;
 656         req[9] = phy->number;
 657
 658         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 659                                resp, RPEL_RESP_SIZE);
 660
 661         if (res)
 662                 goto out;
 663
 664         phy->invalid_dword_count = get_unaligned_be32(&resp[12]);
 665         phy->running_disparity_error_count = get_unaligned_be32(&resp[16]);
 666         phy->loss_of_dword_sync_count = get_unaligned_be32(&resp[20]);
 667         phy->phy_reset_problem_count = get_unaligned_be32(&resp[24]);
 668
 669  out:
 670         kfree(req);
 671         kfree(resp);
 672         return res;
 673
 674 }
 675
 676 #ifdef CONFIG_SCSI_SAS_ATA
 677
 678 #define RPS_REQ_SIZE  16
 679 #define RPS_RESP_SIZE sizeof(struct smp_rps_resp)
 680
 681 int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
 682                             struct smp_rps_resp *rps_resp)
 683 {
 684         int res;
 685         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 686         u8 *resp = (u8 *)rps_resp;
 687
 688         if (!rps_req)
 689                 return -ENOMEM;
 690
 691         rps_req[1] = SMP_REPORT_PHY_SATA;
 692         rps_req[9] = phy_id;
 693
 694         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 695                                rps_resp, RPS_RESP_SIZE);
 696
 697         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 698          * standards cockup here.  sas-2 explicitly specifies the FIS
 699          * should be encoded so that FIS type is in resp[24].
 700          * However, some expanders endian reverse this.  Undo the
 701          * reversal here */
 702         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 703                 int i;
 704
 705                 for (i = 0; i < 5; i++) {
 706                         int j = 24 + (i*4);
 707                         u8 a, b;
 708                         a = resp[j + 0];
 709                         b = resp[j + 1];
 710                         resp[j + 0] = resp[j + 3];
 711                         resp[j + 1] = resp[j + 2];
 712                         resp[j + 2] = b;
 713                         resp[j + 3] = a;
 714                 }
 715         }
 716
 717         kfree(rps_req);
 718         return res;
 719 }
 720 #endif
 721
 722 static void sas_ex_get_linkrate(struct domain_device *parent,
 723                                        struct domain_device *child,
 724                                        struct ex_phy *parent_phy)
 725 {
 726         struct expander_device *parent_ex = &parent->ex_dev;
 727         struct sas_port *port;
 728         int i;
 729
 730         child->pathways = 0;
 731
 732         port = parent_phy->port;
 733
 734         for (i = 0; i < parent_ex->num_phys; i++) {
 735                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 736
 737                 if (phy->phy_state == PHY_VACANT ||
 738                     phy->phy_state == PHY_NOT_PRESENT)
 739                         continue;
 740
 741                 if (sas_phy_match_dev_addr(child, phy)) {
 742                         child->min_linkrate = min(parent->min_linkrate,
 743                                                   phy->linkrate);
 744                         child->max_linkrate = max(parent->max_linkrate,
 745                                                   phy->linkrate);
 746                         child->pathways++;
 747                         sas_port_add_phy(port, phy->phy);
 748                 }
 749         }
 750         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 751         child->pathways = min(child->pathways, parent->pathways);
 752 }
 753
 754 static struct domain_device *sas_ex_discover_end_dev(
 755         struct domain_device *parent, int phy_id)
 756 {
 757         struct expander_device *parent_ex = &parent->ex_dev;
 758         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 759         struct domain_device *child = NULL;
 760         struct sas_rphy *rphy;
 761         int res;
 762
 763         if (phy->attached_sata_host || phy->attached_sata_ps)
 764                 return NULL;
 765
 766         child = sas_alloc_device();
 767         if (!child)
 768                 return NULL;
 769
 770         kref_get(&parent->kref);
 771         child->parent = parent;
 772         child->port   = parent->port;
 773         child->iproto = phy->attached_iproto;
 774         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 775         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 776         if (!phy->port) {
 777                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 778                 if (unlikely(!phy->port))
 779                         goto out_err;
 780                 if (unlikely(sas_port_add(phy->port) != 0)) {
 781                         sas_port_free(phy->port);
 782                         goto out_err;
 783                 }
 784         }
 785         sas_ex_get_linkrate(parent, child, phy);
 786         sas_device_set_phy(child, phy->port);
 787
 788         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 789                 res = sas_ata_add_dev(parent, phy, child, phy_id);
 790                 if (res)
 791                         goto out_free;
 792         } else if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 793                 child->dev_type = SAS_END_DEVICE;
 794                 rphy = sas_end_device_alloc(phy->port);
 795                 /* FIXME: error handling */
 796                 if (unlikely(!rphy))
 797                         goto out_free;
 798                 child->tproto = phy->attached_tproto;
 799                 sas_init_dev(child);
 800
 801                 child->rphy = rphy;
 802                 get_device(&rphy->dev);
 803                 rphy->identify.phy_identifier = phy_id;
 804                 sas_fill_in_rphy(child, rphy);
 805
 806                 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 807
 808                 res = sas_discover_end_dev(child);
 809                 if (res) {
 810                         pr_notice("sas_discover_end_dev() for device %016llx at %016llx:%02d returned 0x%x\n",
 811                                   SAS_ADDR(child->sas_addr),
 812                                   SAS_ADDR(parent->sas_addr), phy_id, res);
 813                         goto out_list_del;
 814                 }
 815         } else {
 816                 pr_notice("target proto 0x%x at %016llx:0x%x not handled\n",
 817                           phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 818                           phy_id);
 819                 goto out_free;
 820         }
 821
 822         list_add_tail(&child->siblings, &parent_ex->children);
 823         return child;
 824
 825  out_list_del:
 826         sas_rphy_free(child->rphy);
 827         list_del(&child->disco_list_node);
 828  out_free:
 829         sas_port_delete(phy->port);
 830  out_err:
 831         phy->port = NULL;
 832         sas_put_device(child);
 833         return NULL;
 834 }
 835
 836 /* See if this phy is part of a wide port */
 837 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 838 {
 839         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 840         int i;
 841
 842         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 843                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 844
 845                 if (ephy == phy)
 846                         continue;
 847
 848                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 849                             SAS_ADDR_SIZE) && ephy->port) {
 850                         sas_port_add_phy(ephy->port, phy->phy);
 851                         phy->port = ephy->port;
 852                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 853                         return true;
 854                 }
 855         }
 856
 857         return false;
 858 }
 859
 860 static struct domain_device *sas_ex_discover_expander(
 861         struct domain_device *parent, int phy_id)
 862 {
 863         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 864         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 865         struct domain_device *child = NULL;
 866         struct sas_rphy *rphy;
 867         struct sas_expander_device *edev;
 868         struct asd_sas_port *port;
 869         int res;
 870
 871         if (phy->routing_attr == DIRECT_ROUTING) {
 872                 pr_warn("ex %016llx:%02d:D <--> ex %016llx:0x%x is not allowed\n",
 873                         SAS_ADDR(parent->sas_addr), phy_id,
 874                         SAS_ADDR(phy->attached_sas_addr),
 875                         phy->attached_phy_id);
 876                 return NULL;
 877         }
 878         child = sas_alloc_device();
 879         if (!child)
 880                 return NULL;
 881
 882         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 883         /* FIXME: better error handling */
 884         BUG_ON(sas_port_add(phy->port) != 0);
 885
 886
 887         switch (phy->attached_dev_type) {
 888         case SAS_EDGE_EXPANDER_DEVICE:
 889                 rphy = sas_expander_alloc(phy->port,
 890                                           SAS_EDGE_EXPANDER_DEVICE);
 891                 break;
 892         case SAS_FANOUT_EXPANDER_DEVICE:
 893                 rphy = sas_expander_alloc(phy->port,
 894                                           SAS_FANOUT_EXPANDER_DEVICE);
 895                 break;
 896         default:
 897                 rphy = NULL;    /* shut gcc up */
 898                 BUG();
 899         }
 900         port = parent->port;
 901         child->rphy = rphy;
 902         get_device(&rphy->dev);
 903         edev = rphy_to_expander_device(rphy);
 904         child->dev_type = phy->attached_dev_type;
 905         kref_get(&parent->kref);
 906         child->parent = parent;
 907         child->port = port;
 908         child->iproto = phy->attached_iproto;
 909         child->tproto = phy->attached_tproto;
 910         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 911         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 912         sas_ex_get_linkrate(parent, child, phy);
 913         edev->level = parent_ex->level + 1;
 914         parent->port->disc.max_level = max(parent->port->disc.max_level,
 915                                            edev->level);
 916         sas_init_dev(child);
 917         sas_fill_in_rphy(child, rphy);
 918         sas_rphy_add(rphy);
 919
 920         spin_lock_irq(&parent->port->dev_list_lock);
 921         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 922         spin_unlock_irq(&parent->port->dev_list_lock);
 923
 924         res = sas_discover_expander(child);
 925         if (res) {
 926                 sas_rphy_delete(rphy);
 927                 spin_lock_irq(&parent->port->dev_list_lock);
 928                 list_del(&child->dev_list_node);
 929                 spin_unlock_irq(&parent->port->dev_list_lock);
 930                 sas_put_device(child);
 931                 sas_port_delete(phy->port);
 932                 phy->port = NULL;
 933                 return NULL;
 934         }
 935         list_add_tail(&child->siblings, &parent->ex_dev.children);
 936         return child;
 937 }
 938
 939 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 940 {
 941         struct expander_device *ex = &dev->ex_dev;
 942         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 943         struct domain_device *child = NULL;
 944         int res = 0;
 945
 946         /* Phy state */
 947         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 948                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 949                         res = sas_ex_phy_discover(dev, phy_id);
 950                 if (res)
 951                         return res;
 952         }
 953
 954         /* Parent and domain coherency */
 955         if (!dev->parent && sas_phy_match_port_addr(dev->port, ex_phy)) {
 956                 sas_add_parent_port(dev, phy_id);
 957                 return 0;
 958         }
 959         if (dev->parent && sas_phy_match_dev_addr(dev->parent, ex_phy)) {
 960                 sas_add_parent_port(dev, phy_id);
 961                 if (ex_phy->routing_attr == TABLE_ROUTING)
 962                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 963                 return 0;
 964         }
 965
 966         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 967                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 968
 969         if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
 970                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 971                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 972                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 973                 }
 974                 return 0;
 975         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 976                 return 0;
 977
 978         if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
 979             ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
 980             ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
 981             ex_phy->attached_dev_type != SAS_SATA_PENDING) {
 982                 pr_warn("unknown device type(0x%x) attached to ex %016llx phy%02d\n",
 983                         ex_phy->attached_dev_type,
 984                         SAS_ADDR(dev->sas_addr),
 985                         phy_id);
 986                 return 0;
 987         }
 988
 989         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 990         if (res) {
 991                 pr_notice("configure routing for dev %016llx reported 0x%x. Forgotten\n",
 992                           SAS_ADDR(ex_phy->attached_sas_addr), res);
 993                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 994                 return res;
 995         }
 996
 997         if (sas_ex_join_wide_port(dev, phy_id)) {
 998                 pr_debug("Attaching ex phy%02d to wide port %016llx\n",
 999                          phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1000                 return res;
1001         }
1002
1003         switch (ex_phy->attached_dev_type) {
1004         case SAS_END_DEVICE:
1005         case SAS_SATA_PENDING:
1006                 child = sas_ex_discover_end_dev(dev, phy_id);
1007                 break;
1008         case SAS_FANOUT_EXPANDER_DEVICE:
1009                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1010                         pr_debug("second fanout expander %016llx phy%02d attached to ex %016llx phy%02d\n",
1011                                  SAS_ADDR(ex_phy->attached_sas_addr),
1012                                  ex_phy->attached_phy_id,
1013                                  SAS_ADDR(dev->sas_addr),
1014                                  phy_id);
1015                         sas_ex_disable_phy(dev, phy_id);
1016                         return res;
1017                 } else
1018                         memcpy(dev->port->disc.fanout_sas_addr,
1019                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1020                 fallthrough;
1021         case SAS_EDGE_EXPANDER_DEVICE:
1022                 child = sas_ex_discover_expander(dev, phy_id);
1023                 break;
1024         default:
1025                 break;
1026         }
1027
1028         if (!child)
1029                 pr_notice("ex %016llx phy%02d failed to discover\n",
1030                           SAS_ADDR(dev->sas_addr), phy_id);
1031         return res;
1032 }
1033
1034 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1035 {
1036         struct expander_device *ex = &dev->ex_dev;
1037         int i;
1038
1039         for (i = 0; i < ex->num_phys; i++) {
1040                 struct ex_phy *phy = &ex->ex_phy[i];
1041
1042                 if (phy->phy_state == PHY_VACANT ||
1043                     phy->phy_state == PHY_NOT_PRESENT)
1044                         continue;
1045
1046                 if (dev_is_expander(phy->attached_dev_type) &&
1047                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1048
1049                         memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
1050
1051                         return 1;
1052                 }
1053         }
1054         return 0;
1055 }
1056
1057 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1058 {
1059         struct expander_device *ex = &dev->ex_dev;
1060         struct domain_device *child;
1061         u8 sub_addr[SAS_ADDR_SIZE] = {0, };
1062
1063         list_for_each_entry(child, &ex->children, siblings) {
1064                 if (!dev_is_expander(child->dev_type))
1065                         continue;
1066                 if (sub_addr[0] == 0) {
1067                         sas_find_sub_addr(child, sub_addr);
1068                         continue;
1069                 } else {
1070                         u8 s2[SAS_ADDR_SIZE];
1071
1072                         if (sas_find_sub_addr(child, s2) &&
1073                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1074
1075                                 pr_notice("ex %016llx->%016llx-?->%016llx diverges from subtractive boundary %016llx\n",
1076                                           SAS_ADDR(dev->sas_addr),
1077                                           SAS_ADDR(child->sas_addr),
1078                                           SAS_ADDR(s2),
1079                                           SAS_ADDR(sub_addr));
1080
1081                                 sas_ex_disable_port(child, s2);
1082                         }
1083                 }
1084         }
1085         return 0;
1086 }
1087 /**
1088  * sas_ex_discover_devices - discover devices attached to this expander
1089  * @dev: pointer to the expander domain device
1090  * @single: if you want to do a single phy, else set to -1;
1091  *
1092  * Configure this expander for use with its devices and register the
1093  * devices of this expander.
1094  */
1095 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1096 {
1097         struct expander_device *ex = &dev->ex_dev;
1098         int i = 0, end = ex->num_phys;
1099         int res = 0;
1100
1101         if (0 <= single && single < end) {
1102                 i = single;
1103                 end = i+1;
1104         }
1105
1106         for ( ; i < end; i++) {
1107                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1108
1109                 if (ex_phy->phy_state == PHY_VACANT ||
1110                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1111                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1112                         continue;
1113
1114                 switch (ex_phy->linkrate) {
1115                 case SAS_PHY_DISABLED:
1116                 case SAS_PHY_RESET_PROBLEM:
1117                 case SAS_SATA_PORT_SELECTOR:
1118                         continue;
1119                 default:
1120                         res = sas_ex_discover_dev(dev, i);
1121                         if (res)
1122                                 break;
1123                         continue;
1124                 }
1125         }
1126
1127         if (!res)
1128                 sas_check_level_subtractive_boundary(dev);
1129
1130         return res;
1131 }
1132
1133 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1134 {
1135         struct expander_device *ex = &dev->ex_dev;
1136         int i;
1137         u8  *sub_sas_addr = NULL;
1138
1139         if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
1140                 return 0;
1141
1142         for (i = 0; i < ex->num_phys; i++) {
1143                 struct ex_phy *phy = &ex->ex_phy[i];
1144
1145                 if (phy->phy_state == PHY_VACANT ||
1146                     phy->phy_state == PHY_NOT_PRESENT)
1147                         continue;
1148
1149                 if (dev_is_expander(phy->attached_dev_type) &&
1150                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1151
1152                         if (!sub_sas_addr)
1153                                 sub_sas_addr = &phy->attached_sas_addr[0];
1154                         else if (SAS_ADDR(sub_sas_addr) !=
1155                                  SAS_ADDR(phy->attached_sas_addr)) {
1156
1157                                 pr_notice("ex %016llx phy%02d diverges(%016llx) on subtractive boundary(%016llx). Disabled\n",
1158                                           SAS_ADDR(dev->sas_addr), i,
1159                                           SAS_ADDR(phy->attached_sas_addr),
1160                                           SAS_ADDR(sub_sas_addr));
1161                                 sas_ex_disable_phy(dev, i);
1162                         }
1163                 }
1164         }
1165         return 0;
1166 }
1167
1168 static void sas_print_parent_topology_bug(struct domain_device *child,
1169                                                  struct ex_phy *parent_phy,
1170                                                  struct ex_phy *child_phy)
1171 {
1172         static const char *ex_type[] = {
1173                 [SAS_EDGE_EXPANDER_DEVICE] = "edge",
1174                 [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
1175         };
1176         struct domain_device *parent = child->parent;
1177
1178         pr_notice("%s ex %016llx phy%02d <--> %s ex %016llx phy%02d has %c:%c routing link!\n",
1179                   ex_type[parent->dev_type],
1180                   SAS_ADDR(parent->sas_addr),
1181                   parent_phy->phy_id,
1182
1183                   ex_type[child->dev_type],
1184                   SAS_ADDR(child->sas_addr),
1185                   child_phy->phy_id,
1186
1187                   sas_route_char(parent, parent_phy),
1188                   sas_route_char(child, child_phy));
1189 }
1190
1191 static int sas_check_eeds(struct domain_device *child,
1192                                  struct ex_phy *parent_phy,
1193                                  struct ex_phy *child_phy)
1194 {
1195         int res = 0;
1196         struct domain_device *parent = child->parent;
1197
1198         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1199                 res = -ENODEV;
1200                 pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n",
1201                         SAS_ADDR(parent->sas_addr),
1202                         parent_phy->phy_id,
1203                         SAS_ADDR(child->sas_addr),
1204                         child_phy->phy_id,
1205                         SAS_ADDR(parent->port->disc.fanout_sas_addr));
1206         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1207                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1208                        SAS_ADDR_SIZE);
1209                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1210                        SAS_ADDR_SIZE);
1211         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1212                     SAS_ADDR(parent->sas_addr)) ||
1213                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1214                     SAS_ADDR(child->sas_addr)))
1215                    &&
1216                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1217                      SAS_ADDR(parent->sas_addr)) ||
1218                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1219                      SAS_ADDR(child->sas_addr))))
1220                 ;
1221         else {
1222                 res = -ENODEV;
1223                 pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n",
1224                         SAS_ADDR(parent->sas_addr),
1225                         parent_phy->phy_id,
1226                         SAS_ADDR(child->sas_addr),
1227                         child_phy->phy_id);
1228         }
1229
1230         return res;
1231 }
1232
1233 /* Here we spill over 80 columns.  It is intentional.
1234  */
1235 static int sas_check_parent_topology(struct domain_device *child)
1236 {
1237         struct expander_device *child_ex = &child->ex_dev;
1238         struct expander_device *parent_ex;
1239         int i;
1240         int res = 0;
1241
1242         if (!child->parent)
1243                 return 0;
1244
1245         if (!dev_is_expander(child->parent->dev_type))
1246                 return 0;
1247
1248         parent_ex = &child->parent->ex_dev;
1249
1250         for (i = 0; i < parent_ex->num_phys; i++) {
1251                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1252                 struct ex_phy *child_phy;
1253
1254                 if (parent_phy->phy_state == PHY_VACANT ||
1255                     parent_phy->phy_state == PHY_NOT_PRESENT)
1256                         continue;
1257
1258                 if (!sas_phy_match_dev_addr(child, parent_phy))
1259                         continue;
1260
1261                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1262
1263                 switch (child->parent->dev_type) {
1264                 case SAS_EDGE_EXPANDER_DEVICE:
1265                         if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1266                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1267                                     child_phy->routing_attr != TABLE_ROUTING) {
1268                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1269                                         res = -ENODEV;
1270                                 }
1271                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1272                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1273                                         res = sas_check_eeds(child, parent_phy, child_phy);
1274                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1275                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1276                                         res = -ENODEV;
1277                                 }
1278                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1279                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1280                                     (child_phy->routing_attr == TABLE_ROUTING &&
1281                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1282                                         /* All good */;
1283                                 } else {
1284                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1285                                         res = -ENODEV;
1286                                 }
1287                         }
1288                         break;
1289                 case SAS_FANOUT_EXPANDER_DEVICE:
1290                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1291                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1292                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1293                                 res = -ENODEV;
1294                         }
1295                         break;
1296                 default:
1297                         break;
1298                 }
1299         }
1300
1301         return res;
1302 }
1303
1304 #define RRI_REQ_SIZE  16
1305 #define RRI_RESP_SIZE 44
1306
1307 static int sas_configure_present(struct domain_device *dev, int phy_id,
1308                                  u8 *sas_addr, int *index, int *present)
1309 {
1310         int i, res = 0;
1311         struct expander_device *ex = &dev->ex_dev;
1312         struct ex_phy *phy = &ex->ex_phy[phy_id];
1313         u8 *rri_req;
1314         u8 *rri_resp;
1315
1316         *present = 0;
1317         *index = 0;
1318
1319         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1320         if (!rri_req)
1321                 return -ENOMEM;
1322
1323         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1324         if (!rri_resp) {
1325                 kfree(rri_req);
1326                 return -ENOMEM;
1327         }
1328
1329         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1330         rri_req[9] = phy_id;
1331
1332         for (i = 0; i < ex->max_route_indexes ; i++) {
1333                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1334                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1335                                        RRI_RESP_SIZE);
1336                 if (res)
1337                         goto out;
1338                 res = rri_resp[2];
1339                 if (res == SMP_RESP_NO_INDEX) {
1340                         pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1341                                 SAS_ADDR(dev->sas_addr), phy_id, i);
1342                         goto out;
1343                 } else if (res != SMP_RESP_FUNC_ACC) {
1344                         pr_notice("%s: dev %016llx phy%02d index 0x%x result 0x%x\n",
1345                                   __func__, SAS_ADDR(dev->sas_addr), phy_id,
1346                                   i, res);
1347                         goto out;
1348                 }
1349                 if (SAS_ADDR(sas_addr) != 0) {
1350                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1351                                 *index = i;
1352                                 if ((rri_resp[12] & 0x80) == 0x80)
1353                                         *present = 0;
1354                                 else
1355                                         *present = 1;
1356                                 goto out;
1357                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1358                                 *index = i;
1359                                 *present = 0;
1360                                 goto out;
1361                         }
1362                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1363                            phy->last_da_index < i) {
1364                         phy->last_da_index = i;
1365                         *index = i;
1366                         *present = 0;
1367                         goto out;
1368                 }
1369         }
1370         res = -1;
1371 out:
1372         kfree(rri_req);
1373         kfree(rri_resp);
1374         return res;
1375 }
1376
1377 #define CRI_REQ_SIZE  44
1378 #define CRI_RESP_SIZE  8
1379
1380 static int sas_configure_set(struct domain_device *dev, int phy_id,
1381                              u8 *sas_addr, int index, int include)
1382 {
1383         int res;
1384         u8 *cri_req;
1385         u8 *cri_resp;
1386
1387         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1388         if (!cri_req)
1389                 return -ENOMEM;
1390
1391         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1392         if (!cri_resp) {
1393                 kfree(cri_req);
1394                 return -ENOMEM;
1395         }
1396
1397         cri_req[1] = SMP_CONF_ROUTE_INFO;
1398         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1399         cri_req[9] = phy_id;
1400         if (SAS_ADDR(sas_addr) == 0 || !include)
1401                 cri_req[12] |= 0x80;
1402         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1403
1404         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1405                                CRI_RESP_SIZE);
1406         if (res)
1407                 goto out;
1408         res = cri_resp[2];
1409         if (res == SMP_RESP_NO_INDEX) {
1410                 pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1411                         SAS_ADDR(dev->sas_addr), phy_id, index);
1412         }
1413 out:
1414         kfree(cri_req);
1415         kfree(cri_resp);
1416         return res;
1417 }
1418
1419 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1420                                     u8 *sas_addr, int include)
1421 {
1422         int index;
1423         int present;
1424         int res;
1425
1426         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1427         if (res)
1428                 return res;
1429         if (include ^ present)
1430                 return sas_configure_set(dev, phy_id, sas_addr, index,
1431                                          include);
1432
1433         return res;
1434 }
1435
1436 /**
1437  * sas_configure_parent - configure routing table of parent
1438  * @parent: parent expander
1439  * @child: child expander
1440  * @sas_addr: SAS port identifier of device directly attached to child
1441  * @include: whether or not to include @child in the expander routing table
1442  */
1443 static int sas_configure_parent(struct domain_device *parent,
1444                                 struct domain_device *child,
1445                                 u8 *sas_addr, int include)
1446 {
1447         struct expander_device *ex_parent = &parent->ex_dev;
1448         int res = 0;
1449         int i;
1450
1451         if (parent->parent) {
1452                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1453                                            include);
1454                 if (res)
1455                         return res;
1456         }
1457
1458         if (ex_parent->conf_route_table == 0) {
1459                 pr_debug("ex %016llx has self-configuring routing table\n",
1460                          SAS_ADDR(parent->sas_addr));
1461                 return 0;
1462         }
1463
1464         for (i = 0; i < ex_parent->num_phys; i++) {
1465                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1466
1467                 if ((phy->routing_attr == TABLE_ROUTING) &&
1468                     sas_phy_match_dev_addr(child, phy)) {
1469                         res = sas_configure_phy(parent, i, sas_addr, include);
1470                         if (res)
1471                                 return res;
1472                 }
1473         }
1474
1475         return res;
1476 }
1477
1478 /**
1479  * sas_configure_routing - configure routing
1480  * @dev: expander device
1481  * @sas_addr: port identifier of device directly attached to the expander device
1482  */
1483 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1484 {
1485         if (dev->parent)
1486                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1487         return 0;
1488 }
1489
1490 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1491 {
1492         if (dev->parent)
1493                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1494         return 0;
1495 }
1496
1497 /**
1498  * sas_discover_expander - expander discovery
1499  * @dev: pointer to expander domain device
1500  *
1501  * See comment in sas_discover_sata().
1502  */
1503 static int sas_discover_expander(struct domain_device *dev)
1504 {
1505         int res;
1506
1507         res = sas_notify_lldd_dev_found(dev);
1508         if (res)
1509                 return res;
1510
1511         res = sas_ex_general(dev);
1512         if (res)
1513                 goto out_err;
1514         res = sas_ex_manuf_info(dev);
1515         if (res)
1516                 goto out_err;
1517
1518         res = sas_expander_discover(dev);
1519         if (res) {
1520                 pr_warn("expander %016llx discovery failed(0x%x)\n",
1521                         SAS_ADDR(dev->sas_addr), res);
1522                 goto out_err;
1523         }
1524
1525         sas_check_ex_subtractive_boundary(dev);
1526         res = sas_check_parent_topology(dev);
1527         if (res)
1528                 goto out_err;
1529         return 0;
1530 out_err:
1531         sas_notify_lldd_dev_gone(dev);
1532         return res;
1533 }
1534
1535 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1536 {
1537         int res = 0;
1538         struct domain_device *dev;
1539
1540         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1541                 if (dev_is_expander(dev->dev_type)) {
1542                         struct sas_expander_device *ex =
1543                                 rphy_to_expander_device(dev->rphy);
1544
1545                         if (level == ex->level)
1546                                 res = sas_ex_discover_devices(dev, -1);
1547                         else if (level > 0)
1548                                 res = sas_ex_discover_devices(port->port_dev, -1);
1549
1550                 }
1551         }
1552
1553         return res;
1554 }
1555
1556 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1557 {
1558         int res;
1559         int level;
1560
1561         do {
1562                 level = port->disc.max_level;
1563                 res = sas_ex_level_discovery(port, level);
1564                 mb();
1565         } while (level < port->disc.max_level);
1566
1567         return res;
1568 }
1569
1570 int sas_discover_root_expander(struct domain_device *dev)
1571 {
1572         int res;
1573         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1574
1575         res = sas_rphy_add(dev->rphy);
1576         if (res)
1577                 goto out_err;
1578
1579         ex->level = dev->port->disc.max_level; /* 0 */
1580         res = sas_discover_expander(dev);
1581         if (res)
1582                 goto out_err2;
1583
1584         sas_ex_bfs_disc(dev->port);
1585
1586         return res;
1587
1588 out_err2:
1589         sas_rphy_remove(dev->rphy);
1590 out_err:
1591         return res;
1592 }
1593
1594 /* ---------- Domain revalidation ---------- */
1595
1596 static int sas_get_phy_discover(struct domain_device *dev,
1597                                 int phy_id, struct smp_disc_resp *disc_resp)
1598 {
1599         int res;
1600         u8 *disc_req;
1601
1602         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1603         if (!disc_req)
1604                 return -ENOMEM;
1605
1606         disc_req[1] = SMP_DISCOVER;
1607         disc_req[9] = phy_id;
1608
1609         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1610                                disc_resp, DISCOVER_RESP_SIZE);
1611         if (res)
1612                 goto out;
1613         if (disc_resp->result != SMP_RESP_FUNC_ACC)
1614                 res = disc_resp->result;
1615 out:
1616         kfree(disc_req);
1617         return res;
1618 }
1619
1620 static int sas_get_phy_change_count(struct domain_device *dev,
1621                                     int phy_id, int *pcc)
1622 {
1623         int res;
1624         struct smp_disc_resp *disc_resp;
1625
1626         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1627         if (!disc_resp)
1628                 return -ENOMEM;
1629
1630         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1631         if (!res)
1632                 *pcc = disc_resp->disc.change_count;
1633
1634         kfree(disc_resp);
1635         return res;
1636 }
1637
1638 int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1639                              u8 *sas_addr, enum sas_device_type *type)
1640 {
1641         int res;
1642         struct smp_disc_resp *disc_resp;
1643
1644         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1645         if (!disc_resp)
1646                 return -ENOMEM;
1647
1648         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1649         if (res == 0) {
1650                 memcpy(sas_addr, disc_resp->disc.attached_sas_addr,
1651                        SAS_ADDR_SIZE);
1652                 *type = to_dev_type(&disc_resp->disc);
1653                 if (*type == 0)
1654                         memset(sas_addr, 0, SAS_ADDR_SIZE);
1655         }
1656         kfree(disc_resp);
1657         return res;
1658 }
1659
1660 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1661                               int from_phy, bool update)
1662 {
1663         struct expander_device *ex = &dev->ex_dev;
1664         int res = 0;
1665         int i;
1666
1667         for (i = from_phy; i < ex->num_phys; i++) {
1668                 int phy_change_count = 0;
1669
1670                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1671                 switch (res) {
1672                 case SMP_RESP_PHY_VACANT:
1673                 case SMP_RESP_NO_PHY:
1674                         continue;
1675                 case SMP_RESP_FUNC_ACC:
1676                         break;
1677                 default:
1678                         return res;
1679                 }
1680
1681                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1682                         if (update)
1683                                 ex->ex_phy[i].phy_change_count =
1684                                         phy_change_count;
1685                         *phy_id = i;
1686                         return 0;
1687                 }
1688         }
1689         return 0;
1690 }
1691
1692 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1693 {
1694         int res;
1695         u8  *rg_req;
1696         struct smp_rg_resp  *rg_resp;
1697
1698         rg_req = alloc_smp_req(RG_REQ_SIZE);
1699         if (!rg_req)
1700                 return -ENOMEM;
1701
1702         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1703         if (!rg_resp) {
1704                 kfree(rg_req);
1705                 return -ENOMEM;
1706         }
1707
1708         rg_req[1] = SMP_REPORT_GENERAL;
1709
1710         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1711                                RG_RESP_SIZE);
1712         if (res)
1713                 goto out;
1714         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1715                 res = rg_resp->result;
1716                 goto out;
1717         }
1718
1719         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1720 out:
1721         kfree(rg_resp);
1722         kfree(rg_req);
1723         return res;
1724 }
1725 /**
1726  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1727  * @dev:domain device to be detect.
1728  * @src_dev: the device which originated BROADCAST(CHANGE).
1729  *
1730  * Add self-configuration expander support. Suppose two expander cascading,
1731  * when the first level expander is self-configuring, hotplug the disks in
1732  * second level expander, BROADCAST(CHANGE) will not only be originated
1733  * in the second level expander, but also be originated in the first level
1734  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1735  * expander changed count in two level expanders will all increment at least
1736  * once, but the phy which chang count has changed is the source device which
1737  * we concerned.
1738  */
1739
1740 static int sas_find_bcast_dev(struct domain_device *dev,
1741                               struct domain_device **src_dev)
1742 {
1743         struct expander_device *ex = &dev->ex_dev;
1744         int ex_change_count = -1;
1745         int phy_id = -1;
1746         int res;
1747         struct domain_device *ch;
1748
1749         res = sas_get_ex_change_count(dev, &ex_change_count);
1750         if (res)
1751                 goto out;
1752         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1753                 /* Just detect if this expander phys phy change count changed,
1754                 * in order to determine if this expander originate BROADCAST,
1755                 * and do not update phy change count field in our structure.
1756                 */
1757                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1758                 if (phy_id != -1) {
1759                         *src_dev = dev;
1760                         ex->ex_change_count = ex_change_count;
1761                         pr_info("ex %016llx phy%02d change count has changed\n",
1762                                 SAS_ADDR(dev->sas_addr), phy_id);
1763                         return res;
1764                 } else
1765                         pr_info("ex %016llx phys DID NOT change\n",
1766                                 SAS_ADDR(dev->sas_addr));
1767         }
1768         list_for_each_entry(ch, &ex->children, siblings) {
1769                 if (dev_is_expander(ch->dev_type)) {
1770                         res = sas_find_bcast_dev(ch, src_dev);
1771                         if (*src_dev)
1772                                 return res;
1773                 }
1774         }
1775 out:
1776         return res;
1777 }
1778
1779 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1780 {
1781         struct expander_device *ex = &dev->ex_dev;
1782         struct domain_device *child, *n;
1783
1784         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1785                 set_bit(SAS_DEV_GONE, &child->state);
1786                 if (dev_is_expander(child->dev_type))
1787                         sas_unregister_ex_tree(port, child);
1788                 else
1789                         sas_unregister_dev(port, child);
1790         }
1791         sas_unregister_dev(port, dev);
1792 }
1793
1794 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1795                                          int phy_id, bool last)
1796 {
1797         struct expander_device *ex_dev = &parent->ex_dev;
1798         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1799         struct domain_device *child, *n, *found = NULL;
1800         if (last) {
1801                 list_for_each_entry_safe(child, n,
1802                         &ex_dev->children, siblings) {
1803                         if (sas_phy_match_dev_addr(child, phy)) {
1804                                 set_bit(SAS_DEV_GONE, &child->state);
1805                                 if (dev_is_expander(child->dev_type))
1806                                         sas_unregister_ex_tree(parent->port, child);
1807                                 else
1808                                         sas_unregister_dev(parent->port, child);
1809                                 found = child;
1810                                 break;
1811                         }
1812                 }
1813                 sas_disable_routing(parent, phy->attached_sas_addr);
1814         }
1815         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1816         if (phy->port) {
1817                 sas_port_delete_phy(phy->port, phy->phy);
1818                 sas_device_set_phy(found, phy->port);
1819                 if (phy->port->num_phys == 0)
1820                         list_add_tail(&phy->port->del_list,
1821                                 &parent->port->sas_port_del_list);
1822                 phy->port = NULL;
1823         }
1824 }
1825
1826 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1827                                           const int level)
1828 {
1829         struct expander_device *ex_root = &root->ex_dev;
1830         struct domain_device *child;
1831         int res = 0;
1832
1833         list_for_each_entry(child, &ex_root->children, siblings) {
1834                 if (dev_is_expander(child->dev_type)) {
1835                         struct sas_expander_device *ex =
1836                                 rphy_to_expander_device(child->rphy);
1837
1838                         if (level > ex->level)
1839                                 res = sas_discover_bfs_by_root_level(child,
1840                                                                      level);
1841                         else if (level == ex->level)
1842                                 res = sas_ex_discover_devices(child, -1);
1843                 }
1844         }
1845         return res;
1846 }
1847
1848 static int sas_discover_bfs_by_root(struct domain_device *dev)
1849 {
1850         int res;
1851         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1852         int level = ex->level+1;
1853
1854         res = sas_ex_discover_devices(dev, -1);
1855         if (res)
1856                 goto out;
1857         do {
1858                 res = sas_discover_bfs_by_root_level(dev, level);
1859                 mb();
1860                 level += 1;
1861         } while (level <= dev->port->disc.max_level);
1862 out:
1863         return res;
1864 }
1865
1866 static int sas_discover_new(struct domain_device *dev, int phy_id)
1867 {
1868         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1869         struct domain_device *child;
1870         int res;
1871
1872         pr_debug("ex %016llx phy%02d new device attached\n",
1873                  SAS_ADDR(dev->sas_addr), phy_id);
1874         res = sas_ex_phy_discover(dev, phy_id);
1875         if (res)
1876                 return res;
1877
1878         if (sas_ex_join_wide_port(dev, phy_id))
1879                 return 0;
1880
1881         res = sas_ex_discover_devices(dev, phy_id);
1882         if (res)
1883                 return res;
1884         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1885                 if (sas_phy_match_dev_addr(child, ex_phy)) {
1886                         if (dev_is_expander(child->dev_type))
1887                                 res = sas_discover_bfs_by_root(child);
1888                         break;
1889                 }
1890         }
1891         return res;
1892 }
1893
1894 static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
1895 {
1896         if (old == new)
1897                 return true;
1898
1899         /* treat device directed resets as flutter, if we went
1900          * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
1901          */
1902         if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
1903             (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
1904                 return true;
1905
1906         return false;
1907 }
1908
1909 static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
1910                               bool last, int sibling)
1911 {
1912         struct expander_device *ex = &dev->ex_dev;
1913         struct ex_phy *phy = &ex->ex_phy[phy_id];
1914         enum sas_device_type type = SAS_PHY_UNUSED;
1915         u8 sas_addr[SAS_ADDR_SIZE];
1916         char msg[80] = "";
1917         int res;
1918
1919         if (!last)
1920                 sprintf(msg, ", part of a wide port with phy%02d", sibling);
1921
1922         pr_debug("ex %016llx rediscovering phy%02d%s\n",
1923                  SAS_ADDR(dev->sas_addr), phy_id, msg);
1924
1925         memset(sas_addr, 0, SAS_ADDR_SIZE);
1926         res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
1927         switch (res) {
1928         case SMP_RESP_NO_PHY:
1929                 phy->phy_state = PHY_NOT_PRESENT;
1930                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1931                 return res;
1932         case SMP_RESP_PHY_VACANT:
1933                 phy->phy_state = PHY_VACANT;
1934                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1935                 return res;
1936         case SMP_RESP_FUNC_ACC:
1937                 break;
1938         case -ECOMM:
1939                 break;
1940         default:
1941                 return res;
1942         }
1943
1944         if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
1945                 phy->phy_state = PHY_EMPTY;
1946                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1947                 /*
1948                  * Even though the PHY is empty, for convenience we discover
1949                  * the PHY to update the PHY info, like negotiated linkrate.
1950                  */
1951                 sas_ex_phy_discover(dev, phy_id);
1952                 return res;
1953         } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
1954                    dev_type_flutter(type, phy->attached_dev_type)) {
1955                 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
1956                 char *action = "";
1957
1958                 sas_ex_phy_discover(dev, phy_id);
1959
1960                 if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
1961                         action = ", needs recovery";
1962                 pr_debug("ex %016llx phy%02d broadcast flutter%s\n",
1963                          SAS_ADDR(dev->sas_addr), phy_id, action);
1964                 return res;
1965         }
1966
1967         /* we always have to delete the old device when we went here */
1968         pr_info("ex %016llx phy%02d replace %016llx\n",
1969                 SAS_ADDR(dev->sas_addr), phy_id,
1970                 SAS_ADDR(phy->attached_sas_addr));
1971         sas_unregister_devs_sas_addr(dev, phy_id, last);
1972
1973         return sas_discover_new(dev, phy_id);
1974 }
1975
1976 /**
1977  * sas_rediscover - revalidate the domain.
1978  * @dev:domain device to be detect.
1979  * @phy_id: the phy id will be detected.
1980  *
1981  * NOTE: this process _must_ quit (return) as soon as any connection
1982  * errors are encountered.  Connection recovery is done elsewhere.
1983  * Discover process only interrogates devices in order to discover the
1984  * domain.For plugging out, we un-register the device only when it is
1985  * the last phy in the port, for other phys in this port, we just delete it
1986  * from the port.For inserting, we do discovery when it is the
1987  * first phy,for other phys in this port, we add it to the port to
1988  * forming the wide-port.
1989  */
1990 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1991 {
1992         struct expander_device *ex = &dev->ex_dev;
1993         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1994         int res = 0;
1995         int i;
1996         bool last = true;       /* is this the last phy of the port */
1997
1998         pr_debug("ex %016llx phy%02d originated BROADCAST(CHANGE)\n",
1999                  SAS_ADDR(dev->sas_addr), phy_id);
2000
2001         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2002                 for (i = 0; i < ex->num_phys; i++) {
2003                         struct ex_phy *phy = &ex->ex_phy[i];
2004
2005                         if (i == phy_id)
2006                                 continue;
2007                         if (sas_phy_addr_match(phy, changed_phy)) {
2008                                 last = false;
2009                                 break;
2010                         }
2011                 }
2012                 res = sas_rediscover_dev(dev, phy_id, last, i);
2013         } else
2014                 res = sas_discover_new(dev, phy_id);
2015         return res;
2016 }
2017
2018 /**
2019  * sas_ex_revalidate_domain - revalidate the domain
2020  * @port_dev: port domain device.
2021  *
2022  * NOTE: this process _must_ quit (return) as soon as any connection
2023  * errors are encountered.  Connection recovery is done elsewhere.
2024  * Discover process only interrogates devices in order to discover the
2025  * domain.
2026  */
2027 int sas_ex_revalidate_domain(struct domain_device *port_dev)
2028 {
2029         int res;
2030         struct domain_device *dev = NULL;
2031
2032         res = sas_find_bcast_dev(port_dev, &dev);
2033         if (res == 0 && dev) {
2034                 struct expander_device *ex = &dev->ex_dev;
2035                 int i = 0, phy_id;
2036
2037                 do {
2038                         phy_id = -1;
2039                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
2040                         if (phy_id == -1)
2041                                 break;
2042                         res = sas_rediscover(dev, phy_id);
2043                         i = phy_id + 1;
2044                 } while (i < ex->num_phys);
2045         }
2046         return res;
2047 }
2048
2049 int sas_find_attached_phy_id(struct expander_device *ex_dev,
2050                              struct domain_device *dev)
2051 {
2052         struct ex_phy *phy;
2053         int phy_id;
2054
2055         for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {
2056                 phy = &ex_dev->ex_phy[phy_id];
2057                 if (sas_phy_match_dev_addr(dev, phy))
2058                         return phy_id;
2059         }
2060
2061         return -ENODEV;
2062 }
2063 EXPORT_SYMBOL_GPL(sas_find_attached_phy_id);
2064
2065 void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
2066                 struct sas_rphy *rphy)
2067 {
2068         struct domain_device *dev;
2069         unsigned int rcvlen = 0;
2070         int ret = -EINVAL;
2071
2072         /* no rphy means no smp target support (ie aic94xx host) */
2073         if (!rphy)
2074                 return sas_smp_host_handler(job, shost);
2075
2076         switch (rphy->identify.device_type) {
2077         case SAS_EDGE_EXPANDER_DEVICE:
2078         case SAS_FANOUT_EXPANDER_DEVICE:
2079                 break;
2080         default:
2081                 pr_err("%s: can we send a smp request to a device?\n",
2082                        __func__);
2083                 goto out;
2084         }
2085
2086         dev = sas_find_dev_by_rphy(rphy);
2087         if (!dev) {
2088                 pr_err("%s: fail to find a domain_device?\n", __func__);
2089                 goto out;
2090         }
2091
2092         /* do we need to support multiple segments? */
2093         if (job->request_payload.sg_cnt > 1 ||
2094             job->reply_payload.sg_cnt > 1) {
2095                 pr_info("%s: multiple segments req %u, rsp %u\n",
2096                         __func__, job->request_payload.payload_len,
2097                         job->reply_payload.payload_len);
2098                 goto out;
2099         }
2100
2101         ret = smp_execute_task_sg(dev, job->request_payload.sg_list,
2102                         job->reply_payload.sg_list);
2103         if (ret >= 0) {
2104                 /* bsg_job_done() requires the length received  */
2105                 rcvlen = job->reply_payload.payload_len - ret;
2106                 ret = 0;
2107         }
2108
2109 out:
2110         bsg_job_done(job, ret, rcvlen);
2111 }