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 <[email protected]>
   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(&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_ADDR(phy->attached_sas_addr) ==
 742                     SAS_ADDR(child->sas_addr)) {
 743
 744                         child->min_linkrate = min(parent->min_linkrate,
 745                                                   phy->linkrate);
 746                         child->max_linkrate = max(parent->max_linkrate,
 747                                                   phy->linkrate);
 748                         child->pathways++;
 749                         sas_port_add_phy(port, phy->phy);
 750                 }
 751         }
 752         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 753         child->pathways = min(child->pathways, parent->pathways);
 754 }
 755
 756 static struct domain_device *sas_ex_discover_end_dev(
 757         struct domain_device *parent, int phy_id)
 758 {
 759         struct expander_device *parent_ex = &parent->ex_dev;
 760         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 761         struct domain_device *child = NULL;
 762         struct sas_rphy *rphy;
 763         int res;
 764
 765         if (phy->attached_sata_host || phy->attached_sata_ps)
 766                 return NULL;
 767
 768         child = sas_alloc_device();
 769         if (!child)
 770                 return NULL;
 771
 772         kref_get(&parent->kref);
 773         child->parent = parent;
 774         child->port   = parent->port;
 775         child->iproto = phy->attached_iproto;
 776         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 777         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 778         if (!phy->port) {
 779                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 780                 if (unlikely(!phy->port))
 781                         goto out_err;
 782                 if (unlikely(sas_port_add(phy->port) != 0)) {
 783                         sas_port_free(phy->port);
 784                         goto out_err;
 785                 }
 786         }
 787         sas_ex_get_linkrate(parent, child, phy);
 788         sas_device_set_phy(child, phy->port);
 789
 790 #ifdef CONFIG_SCSI_SAS_ATA
 791         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 792                 if (child->linkrate > parent->min_linkrate) {
 793                         struct sas_phy *cphy = child->phy;
 794                         enum sas_linkrate min_prate = cphy->minimum_linkrate,
 795                                 parent_min_lrate = parent->min_linkrate,
 796                                 min_linkrate = (min_prate > parent_min_lrate) ?
 797                                                parent_min_lrate : 0;
 798                         struct sas_phy_linkrates rates = {
 799                                 .maximum_linkrate = parent->min_linkrate,
 800                                 .minimum_linkrate = min_linkrate,
 801                         };
 802                         int ret;
 803
 804                         pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
 805                                    SAS_ADDR(child->sas_addr), phy_id);
 806                         ret = sas_smp_phy_control(parent, phy_id,
 807                                                   PHY_FUNC_LINK_RESET, &rates);
 808                         if (ret) {
 809                                 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
 810                                        SAS_ADDR(child->sas_addr), phy_id, ret);
 811                                 goto out_free;
 812                         }
 813                         pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
 814                                   SAS_ADDR(child->sas_addr), phy_id);
 815                         child->linkrate = child->min_linkrate;
 816                 }
 817                 res = sas_get_ata_info(child, phy);
 818                 if (res)
 819                         goto out_free;
 820
 821                 sas_init_dev(child);
 822                 res = sas_ata_init(child);
 823                 if (res)
 824                         goto out_free;
 825                 rphy = sas_end_device_alloc(phy->port);
 826                 if (!rphy)
 827                         goto out_free;
 828                 rphy->identify.phy_identifier = phy_id;
 829
 830                 child->rphy = rphy;
 831                 get_device(&rphy->dev);
 832
 833                 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 834
 835                 res = sas_discover_sata(child);
 836                 if (res) {
 837                         pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
 838                                   SAS_ADDR(child->sas_addr),
 839                                   SAS_ADDR(parent->sas_addr), phy_id, res);
 840                         goto out_list_del;
 841                 }
 842         } else
 843 #endif
 844           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 845                 child->dev_type = SAS_END_DEVICE;
 846                 rphy = sas_end_device_alloc(phy->port);
 847                 /* FIXME: error handling */
 848                 if (unlikely(!rphy))
 849                         goto out_free;
 850                 child->tproto = phy->attached_tproto;
 851                 sas_init_dev(child);
 852
 853                 child->rphy = rphy;
 854                 get_device(&rphy->dev);
 855                 rphy->identify.phy_identifier = phy_id;
 856                 sas_fill_in_rphy(child, rphy);
 857
 858                 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 859
 860                 res = sas_discover_end_dev(child);
 861                 if (res) {
 862                         pr_notice("sas_discover_end_dev() for device %016llx at %016llx:%02d returned 0x%x\n",
 863                                   SAS_ADDR(child->sas_addr),
 864                                   SAS_ADDR(parent->sas_addr), phy_id, res);
 865                         goto out_list_del;
 866                 }
 867         } else {
 868                 pr_notice("target proto 0x%x at %016llx:0x%x not handled\n",
 869                           phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 870                           phy_id);
 871                 goto out_free;
 872         }
 873
 874         list_add_tail(&child->siblings, &parent_ex->children);
 875         return child;
 876
 877  out_list_del:
 878         sas_rphy_free(child->rphy);
 879         list_del(&child->disco_list_node);
 880         spin_lock_irq(&parent->port->dev_list_lock);
 881         list_del(&child->dev_list_node);
 882         spin_unlock_irq(&parent->port->dev_list_lock);
 883  out_free:
 884         sas_port_delete(phy->port);
 885  out_err:
 886         phy->port = NULL;
 887         sas_put_device(child);
 888         return NULL;
 889 }
 890
 891 /* See if this phy is part of a wide port */
 892 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 893 {
 894         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 895         int i;
 896
 897         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 898                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 899
 900                 if (ephy == phy)
 901                         continue;
 902
 903                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 904                             SAS_ADDR_SIZE) && ephy->port) {
 905                         sas_port_add_phy(ephy->port, phy->phy);
 906                         phy->port = ephy->port;
 907                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 908                         return true;
 909                 }
 910         }
 911
 912         return false;
 913 }
 914
 915 static struct domain_device *sas_ex_discover_expander(
 916         struct domain_device *parent, int phy_id)
 917 {
 918         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 919         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 920         struct domain_device *child = NULL;
 921         struct sas_rphy *rphy;
 922         struct sas_expander_device *edev;
 923         struct asd_sas_port *port;
 924         int res;
 925
 926         if (phy->routing_attr == DIRECT_ROUTING) {
 927                 pr_warn("ex %016llx:%02d:D <--> ex %016llx:0x%x is not allowed\n",
 928                         SAS_ADDR(parent->sas_addr), phy_id,
 929                         SAS_ADDR(phy->attached_sas_addr),
 930                         phy->attached_phy_id);
 931                 return NULL;
 932         }
 933         child = sas_alloc_device();
 934         if (!child)
 935                 return NULL;
 936
 937         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 938         /* FIXME: better error handling */
 939         BUG_ON(sas_port_add(phy->port) != 0);
 940
 941
 942         switch (phy->attached_dev_type) {
 943         case SAS_EDGE_EXPANDER_DEVICE:
 944                 rphy = sas_expander_alloc(phy->port,
 945                                           SAS_EDGE_EXPANDER_DEVICE);
 946                 break;
 947         case SAS_FANOUT_EXPANDER_DEVICE:
 948                 rphy = sas_expander_alloc(phy->port,
 949                                           SAS_FANOUT_EXPANDER_DEVICE);
 950                 break;
 951         default:
 952                 rphy = NULL;    /* shut gcc up */
 953                 BUG();
 954         }
 955         port = parent->port;
 956         child->rphy = rphy;
 957         get_device(&rphy->dev);
 958         edev = rphy_to_expander_device(rphy);
 959         child->dev_type = phy->attached_dev_type;
 960         kref_get(&parent->kref);
 961         child->parent = parent;
 962         child->port = port;
 963         child->iproto = phy->attached_iproto;
 964         child->tproto = phy->attached_tproto;
 965         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 966         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 967         sas_ex_get_linkrate(parent, child, phy);
 968         edev->level = parent_ex->level + 1;
 969         parent->port->disc.max_level = max(parent->port->disc.max_level,
 970                                            edev->level);
 971         sas_init_dev(child);
 972         sas_fill_in_rphy(child, rphy);
 973         sas_rphy_add(rphy);
 974
 975         spin_lock_irq(&parent->port->dev_list_lock);
 976         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 977         spin_unlock_irq(&parent->port->dev_list_lock);
 978
 979         res = sas_discover_expander(child);
 980         if (res) {
 981                 sas_rphy_delete(rphy);
 982                 spin_lock_irq(&parent->port->dev_list_lock);
 983                 list_del(&child->dev_list_node);
 984                 spin_unlock_irq(&parent->port->dev_list_lock);
 985                 sas_put_device(child);
 986                 sas_port_delete(phy->port);
 987                 phy->port = NULL;
 988                 return NULL;
 989         }
 990         list_add_tail(&child->siblings, &parent->ex_dev.children);
 991         return child;
 992 }
 993
 994 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 995 {
 996         struct expander_device *ex = &dev->ex_dev;
 997         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 998         struct domain_device *child = NULL;
 999         int res = 0;
1000
1001         /* Phy state */
1002         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
1003                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
1004                         res = sas_ex_phy_discover(dev, phy_id);
1005                 if (res)
1006                         return res;
1007         }
1008
1009         /* Parent and domain coherency */
1010         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
1011                              SAS_ADDR(dev->port->sas_addr))) {
1012                 sas_add_parent_port(dev, phy_id);
1013                 return 0;
1014         }
1015         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
1016                             SAS_ADDR(dev->parent->sas_addr))) {
1017                 sas_add_parent_port(dev, phy_id);
1018                 if (ex_phy->routing_attr == TABLE_ROUTING)
1019                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
1020                 return 0;
1021         }
1022
1023         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
1024                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
1025
1026         if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
1027                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
1028                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1029                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
1030                 }
1031                 return 0;
1032         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
1033                 return 0;
1034
1035         if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
1036             ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
1037             ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1038             ex_phy->attached_dev_type != SAS_SATA_PENDING) {
1039                 pr_warn("unknown device type(0x%x) attached to ex %016llx phy%02d\n",
1040                         ex_phy->attached_dev_type,
1041                         SAS_ADDR(dev->sas_addr),
1042                         phy_id);
1043                 return 0;
1044         }
1045
1046         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
1047         if (res) {
1048                 pr_notice("configure routing for dev %016llx reported 0x%x. Forgotten\n",
1049                           SAS_ADDR(ex_phy->attached_sas_addr), res);
1050                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
1051                 return res;
1052         }
1053
1054         if (sas_ex_join_wide_port(dev, phy_id)) {
1055                 pr_debug("Attaching ex phy%02d to wide port %016llx\n",
1056                          phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1057                 return res;
1058         }
1059
1060         switch (ex_phy->attached_dev_type) {
1061         case SAS_END_DEVICE:
1062         case SAS_SATA_PENDING:
1063                 child = sas_ex_discover_end_dev(dev, phy_id);
1064                 break;
1065         case SAS_FANOUT_EXPANDER_DEVICE:
1066                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1067                         pr_debug("second fanout expander %016llx phy%02d attached to ex %016llx phy%02d\n",
1068                                  SAS_ADDR(ex_phy->attached_sas_addr),
1069                                  ex_phy->attached_phy_id,
1070                                  SAS_ADDR(dev->sas_addr),
1071                                  phy_id);
1072                         sas_ex_disable_phy(dev, phy_id);
1073                         return res;
1074                 } else
1075                         memcpy(dev->port->disc.fanout_sas_addr,
1076                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1077                 fallthrough;
1078         case SAS_EDGE_EXPANDER_DEVICE:
1079                 child = sas_ex_discover_expander(dev, phy_id);
1080                 break;
1081         default:
1082                 break;
1083         }
1084
1085         if (!child)
1086                 pr_notice("ex %016llx phy%02d failed to discover\n",
1087                           SAS_ADDR(dev->sas_addr), phy_id);
1088         return res;
1089 }
1090
1091 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1092 {
1093         struct expander_device *ex = &dev->ex_dev;
1094         int i;
1095
1096         for (i = 0; i < ex->num_phys; i++) {
1097                 struct ex_phy *phy = &ex->ex_phy[i];
1098
1099                 if (phy->phy_state == PHY_VACANT ||
1100                     phy->phy_state == PHY_NOT_PRESENT)
1101                         continue;
1102
1103                 if (dev_is_expander(phy->attached_dev_type) &&
1104                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1105
1106                         memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
1107
1108                         return 1;
1109                 }
1110         }
1111         return 0;
1112 }
1113
1114 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1115 {
1116         struct expander_device *ex = &dev->ex_dev;
1117         struct domain_device *child;
1118         u8 sub_addr[SAS_ADDR_SIZE] = {0, };
1119
1120         list_for_each_entry(child, &ex->children, siblings) {
1121                 if (!dev_is_expander(child->dev_type))
1122                         continue;
1123                 if (sub_addr[0] == 0) {
1124                         sas_find_sub_addr(child, sub_addr);
1125                         continue;
1126                 } else {
1127                         u8 s2[SAS_ADDR_SIZE];
1128
1129                         if (sas_find_sub_addr(child, s2) &&
1130                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1131
1132                                 pr_notice("ex %016llx->%016llx-?->%016llx diverges from subtractive boundary %016llx\n",
1133                                           SAS_ADDR(dev->sas_addr),
1134                                           SAS_ADDR(child->sas_addr),
1135                                           SAS_ADDR(s2),
1136                                           SAS_ADDR(sub_addr));
1137
1138                                 sas_ex_disable_port(child, s2);
1139                         }
1140                 }
1141         }
1142         return 0;
1143 }
1144 /**
1145  * sas_ex_discover_devices - discover devices attached to this expander
1146  * @dev: pointer to the expander domain device
1147  * @single: if you want to do a single phy, else set to -1;
1148  *
1149  * Configure this expander for use with its devices and register the
1150  * devices of this expander.
1151  */
1152 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1153 {
1154         struct expander_device *ex = &dev->ex_dev;
1155         int i = 0, end = ex->num_phys;
1156         int res = 0;
1157
1158         if (0 <= single && single < end) {
1159                 i = single;
1160                 end = i+1;
1161         }
1162
1163         for ( ; i < end; i++) {
1164                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1165
1166                 if (ex_phy->phy_state == PHY_VACANT ||
1167                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1168                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1169                         continue;
1170
1171                 switch (ex_phy->linkrate) {
1172                 case SAS_PHY_DISABLED:
1173                 case SAS_PHY_RESET_PROBLEM:
1174                 case SAS_SATA_PORT_SELECTOR:
1175                         continue;
1176                 default:
1177                         res = sas_ex_discover_dev(dev, i);
1178                         if (res)
1179                                 break;
1180                         continue;
1181                 }
1182         }
1183
1184         if (!res)
1185                 sas_check_level_subtractive_boundary(dev);
1186
1187         return res;
1188 }
1189
1190 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1191 {
1192         struct expander_device *ex = &dev->ex_dev;
1193         int i;
1194         u8  *sub_sas_addr = NULL;
1195
1196         if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
1197                 return 0;
1198
1199         for (i = 0; i < ex->num_phys; i++) {
1200                 struct ex_phy *phy = &ex->ex_phy[i];
1201
1202                 if (phy->phy_state == PHY_VACANT ||
1203                     phy->phy_state == PHY_NOT_PRESENT)
1204                         continue;
1205
1206                 if (dev_is_expander(phy->attached_dev_type) &&
1207                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1208
1209                         if (!sub_sas_addr)
1210                                 sub_sas_addr = &phy->attached_sas_addr[0];
1211                         else if (SAS_ADDR(sub_sas_addr) !=
1212                                  SAS_ADDR(phy->attached_sas_addr)) {
1213
1214                                 pr_notice("ex %016llx phy%02d diverges(%016llx) on subtractive boundary(%016llx). Disabled\n",
1215                                           SAS_ADDR(dev->sas_addr), i,
1216                                           SAS_ADDR(phy->attached_sas_addr),
1217                                           SAS_ADDR(sub_sas_addr));
1218                                 sas_ex_disable_phy(dev, i);
1219                         }
1220                 }
1221         }
1222         return 0;
1223 }
1224
1225 static void sas_print_parent_topology_bug(struct domain_device *child,
1226                                                  struct ex_phy *parent_phy,
1227                                                  struct ex_phy *child_phy)
1228 {
1229         static const char *ex_type[] = {
1230                 [SAS_EDGE_EXPANDER_DEVICE] = "edge",
1231                 [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
1232         };
1233         struct domain_device *parent = child->parent;
1234
1235         pr_notice("%s ex %016llx phy%02d <--> %s ex %016llx phy%02d has %c:%c routing link!\n",
1236                   ex_type[parent->dev_type],
1237                   SAS_ADDR(parent->sas_addr),
1238                   parent_phy->phy_id,
1239
1240                   ex_type[child->dev_type],
1241                   SAS_ADDR(child->sas_addr),
1242                   child_phy->phy_id,
1243
1244                   sas_route_char(parent, parent_phy),
1245                   sas_route_char(child, child_phy));
1246 }
1247
1248 static int sas_check_eeds(struct domain_device *child,
1249                                  struct ex_phy *parent_phy,
1250                                  struct ex_phy *child_phy)
1251 {
1252         int res = 0;
1253         struct domain_device *parent = child->parent;
1254
1255         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1256                 res = -ENODEV;
1257                 pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n",
1258                         SAS_ADDR(parent->sas_addr),
1259                         parent_phy->phy_id,
1260                         SAS_ADDR(child->sas_addr),
1261                         child_phy->phy_id,
1262                         SAS_ADDR(parent->port->disc.fanout_sas_addr));
1263         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1264                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1265                        SAS_ADDR_SIZE);
1266                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1267                        SAS_ADDR_SIZE);
1268         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1269                     SAS_ADDR(parent->sas_addr)) ||
1270                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1271                     SAS_ADDR(child->sas_addr)))
1272                    &&
1273                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1274                      SAS_ADDR(parent->sas_addr)) ||
1275                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1276                      SAS_ADDR(child->sas_addr))))
1277                 ;
1278         else {
1279                 res = -ENODEV;
1280                 pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n",
1281                         SAS_ADDR(parent->sas_addr),
1282                         parent_phy->phy_id,
1283                         SAS_ADDR(child->sas_addr),
1284                         child_phy->phy_id);
1285         }
1286
1287         return res;
1288 }
1289
1290 /* Here we spill over 80 columns.  It is intentional.
1291  */
1292 static int sas_check_parent_topology(struct domain_device *child)
1293 {
1294         struct expander_device *child_ex = &child->ex_dev;
1295         struct expander_device *parent_ex;
1296         int i;
1297         int res = 0;
1298
1299         if (!child->parent)
1300                 return 0;
1301
1302         if (!dev_is_expander(child->parent->dev_type))
1303                 return 0;
1304
1305         parent_ex = &child->parent->ex_dev;
1306
1307         for (i = 0; i < parent_ex->num_phys; i++) {
1308                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1309                 struct ex_phy *child_phy;
1310
1311                 if (parent_phy->phy_state == PHY_VACANT ||
1312                     parent_phy->phy_state == PHY_NOT_PRESENT)
1313                         continue;
1314
1315                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1316                         continue;
1317
1318                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1319
1320                 switch (child->parent->dev_type) {
1321                 case SAS_EDGE_EXPANDER_DEVICE:
1322                         if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1323                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1324                                     child_phy->routing_attr != TABLE_ROUTING) {
1325                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1326                                         res = -ENODEV;
1327                                 }
1328                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1329                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1330                                         res = sas_check_eeds(child, parent_phy, child_phy);
1331                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1332                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1333                                         res = -ENODEV;
1334                                 }
1335                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1336                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1337                                     (child_phy->routing_attr == TABLE_ROUTING &&
1338                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1339                                         /* All good */;
1340                                 } else {
1341                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1342                                         res = -ENODEV;
1343                                 }
1344                         }
1345                         break;
1346                 case SAS_FANOUT_EXPANDER_DEVICE:
1347                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1348                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1349                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1350                                 res = -ENODEV;
1351                         }
1352                         break;
1353                 default:
1354                         break;
1355                 }
1356         }
1357
1358         return res;
1359 }
1360
1361 #define RRI_REQ_SIZE  16
1362 #define RRI_RESP_SIZE 44
1363
1364 static int sas_configure_present(struct domain_device *dev, int phy_id,
1365                                  u8 *sas_addr, int *index, int *present)
1366 {
1367         int i, res = 0;
1368         struct expander_device *ex = &dev->ex_dev;
1369         struct ex_phy *phy = &ex->ex_phy[phy_id];
1370         u8 *rri_req;
1371         u8 *rri_resp;
1372
1373         *present = 0;
1374         *index = 0;
1375
1376         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1377         if (!rri_req)
1378                 return -ENOMEM;
1379
1380         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1381         if (!rri_resp) {
1382                 kfree(rri_req);
1383                 return -ENOMEM;
1384         }
1385
1386         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1387         rri_req[9] = phy_id;
1388
1389         for (i = 0; i < ex->max_route_indexes ; i++) {
1390                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1391                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1392                                        RRI_RESP_SIZE);
1393                 if (res)
1394                         goto out;
1395                 res = rri_resp[2];
1396                 if (res == SMP_RESP_NO_INDEX) {
1397                         pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1398                                 SAS_ADDR(dev->sas_addr), phy_id, i);
1399                         goto out;
1400                 } else if (res != SMP_RESP_FUNC_ACC) {
1401                         pr_notice("%s: dev %016llx phy%02d index 0x%x result 0x%x\n",
1402                                   __func__, SAS_ADDR(dev->sas_addr), phy_id,
1403                                   i, res);
1404                         goto out;
1405                 }
1406                 if (SAS_ADDR(sas_addr) != 0) {
1407                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1408                                 *index = i;
1409                                 if ((rri_resp[12] & 0x80) == 0x80)
1410                                         *present = 0;
1411                                 else
1412                                         *present = 1;
1413                                 goto out;
1414                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1415                                 *index = i;
1416                                 *present = 0;
1417                                 goto out;
1418                         }
1419                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1420                            phy->last_da_index < i) {
1421                         phy->last_da_index = i;
1422                         *index = i;
1423                         *present = 0;
1424                         goto out;
1425                 }
1426         }
1427         res = -1;
1428 out:
1429         kfree(rri_req);
1430         kfree(rri_resp);
1431         return res;
1432 }
1433
1434 #define CRI_REQ_SIZE  44
1435 #define CRI_RESP_SIZE  8
1436
1437 static int sas_configure_set(struct domain_device *dev, int phy_id,
1438                              u8 *sas_addr, int index, int include)
1439 {
1440         int res;
1441         u8 *cri_req;
1442         u8 *cri_resp;
1443
1444         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1445         if (!cri_req)
1446                 return -ENOMEM;
1447
1448         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1449         if (!cri_resp) {
1450                 kfree(cri_req);
1451                 return -ENOMEM;
1452         }
1453
1454         cri_req[1] = SMP_CONF_ROUTE_INFO;
1455         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1456         cri_req[9] = phy_id;
1457         if (SAS_ADDR(sas_addr) == 0 || !include)
1458                 cri_req[12] |= 0x80;
1459         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1460
1461         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1462                                CRI_RESP_SIZE);
1463         if (res)
1464                 goto out;
1465         res = cri_resp[2];
1466         if (res == SMP_RESP_NO_INDEX) {
1467                 pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1468                         SAS_ADDR(dev->sas_addr), phy_id, index);
1469         }
1470 out:
1471         kfree(cri_req);
1472         kfree(cri_resp);
1473         return res;
1474 }
1475
1476 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1477                                     u8 *sas_addr, int include)
1478 {
1479         int index;
1480         int present;
1481         int res;
1482
1483         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1484         if (res)
1485                 return res;
1486         if (include ^ present)
1487                 return sas_configure_set(dev, phy_id, sas_addr, index,
1488                                          include);
1489
1490         return res;
1491 }
1492
1493 /**
1494  * sas_configure_parent - configure routing table of parent
1495  * @parent: parent expander
1496  * @child: child expander
1497  * @sas_addr: SAS port identifier of device directly attached to child
1498  * @include: whether or not to include @child in the expander routing table
1499  */
1500 static int sas_configure_parent(struct domain_device *parent,
1501                                 struct domain_device *child,
1502                                 u8 *sas_addr, int include)
1503 {
1504         struct expander_device *ex_parent = &parent->ex_dev;
1505         int res = 0;
1506         int i;
1507
1508         if (parent->parent) {
1509                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1510                                            include);
1511                 if (res)
1512                         return res;
1513         }
1514
1515         if (ex_parent->conf_route_table == 0) {
1516                 pr_debug("ex %016llx has self-configuring routing table\n",
1517                          SAS_ADDR(parent->sas_addr));
1518                 return 0;
1519         }
1520
1521         for (i = 0; i < ex_parent->num_phys; i++) {
1522                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1523
1524                 if ((phy->routing_attr == TABLE_ROUTING) &&
1525                     (SAS_ADDR(phy->attached_sas_addr) ==
1526                      SAS_ADDR(child->sas_addr))) {
1527                         res = sas_configure_phy(parent, i, sas_addr, include);
1528                         if (res)
1529                                 return res;
1530                 }
1531         }
1532
1533         return res;
1534 }
1535
1536 /**
1537  * sas_configure_routing - configure routing
1538  * @dev: expander device
1539  * @sas_addr: port identifier of device directly attached to the expander device
1540  */
1541 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1542 {
1543         if (dev->parent)
1544                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1545         return 0;
1546 }
1547
1548 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1549 {
1550         if (dev->parent)
1551                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1552         return 0;
1553 }
1554
1555 /**
1556  * sas_discover_expander - expander discovery
1557  * @dev: pointer to expander domain device
1558  *
1559  * See comment in sas_discover_sata().
1560  */
1561 static int sas_discover_expander(struct domain_device *dev)
1562 {
1563         int res;
1564
1565         res = sas_notify_lldd_dev_found(dev);
1566         if (res)
1567                 return res;
1568
1569         res = sas_ex_general(dev);
1570         if (res)
1571                 goto out_err;
1572         res = sas_ex_manuf_info(dev);
1573         if (res)
1574                 goto out_err;
1575
1576         res = sas_expander_discover(dev);
1577         if (res) {
1578                 pr_warn("expander %016llx discovery failed(0x%x)\n",
1579                         SAS_ADDR(dev->sas_addr), res);
1580                 goto out_err;
1581         }
1582
1583         sas_check_ex_subtractive_boundary(dev);
1584         res = sas_check_parent_topology(dev);
1585         if (res)
1586                 goto out_err;
1587         return 0;
1588 out_err:
1589         sas_notify_lldd_dev_gone(dev);
1590         return res;
1591 }
1592
1593 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1594 {
1595         int res = 0;
1596         struct domain_device *dev;
1597
1598         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1599                 if (dev_is_expander(dev->dev_type)) {
1600                         struct sas_expander_device *ex =
1601                                 rphy_to_expander_device(dev->rphy);
1602
1603                         if (level == ex->level)
1604                                 res = sas_ex_discover_devices(dev, -1);
1605                         else if (level > 0)
1606                                 res = sas_ex_discover_devices(port->port_dev, -1);
1607
1608                 }
1609         }
1610
1611         return res;
1612 }
1613
1614 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1615 {
1616         int res;
1617         int level;
1618
1619         do {
1620                 level = port->disc.max_level;
1621                 res = sas_ex_level_discovery(port, level);
1622                 mb();
1623         } while (level < port->disc.max_level);
1624
1625         return res;
1626 }
1627
1628 int sas_discover_root_expander(struct domain_device *dev)
1629 {
1630         int res;
1631         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1632
1633         res = sas_rphy_add(dev->rphy);
1634         if (res)
1635                 goto out_err;
1636
1637         ex->level = dev->port->disc.max_level; /* 0 */
1638         res = sas_discover_expander(dev);
1639         if (res)
1640                 goto out_err2;
1641
1642         sas_ex_bfs_disc(dev->port);
1643
1644         return res;
1645
1646 out_err2:
1647         sas_rphy_remove(dev->rphy);
1648 out_err:
1649         return res;
1650 }
1651
1652 /* ---------- Domain revalidation ---------- */
1653
1654 static int sas_get_phy_discover(struct domain_device *dev,
1655                                 int phy_id, struct smp_disc_resp *disc_resp)
1656 {
1657         int res;
1658         u8 *disc_req;
1659
1660         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1661         if (!disc_req)
1662                 return -ENOMEM;
1663
1664         disc_req[1] = SMP_DISCOVER;
1665         disc_req[9] = phy_id;
1666
1667         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1668                                disc_resp, DISCOVER_RESP_SIZE);
1669         if (res)
1670                 goto out;
1671         if (disc_resp->result != SMP_RESP_FUNC_ACC)
1672                 res = disc_resp->result;
1673 out:
1674         kfree(disc_req);
1675         return res;
1676 }
1677
1678 static int sas_get_phy_change_count(struct domain_device *dev,
1679                                     int phy_id, int *pcc)
1680 {
1681         int res;
1682         struct smp_disc_resp *disc_resp;
1683
1684         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1685         if (!disc_resp)
1686                 return -ENOMEM;
1687
1688         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1689         if (!res)
1690                 *pcc = disc_resp->disc.change_count;
1691
1692         kfree(disc_resp);
1693         return res;
1694 }
1695
1696 static int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1697                                     u8 *sas_addr, enum sas_device_type *type)
1698 {
1699         int res;
1700         struct smp_disc_resp *disc_resp;
1701
1702         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1703         if (!disc_resp)
1704                 return -ENOMEM;
1705
1706         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1707         if (res == 0) {
1708                 memcpy(sas_addr, disc_resp->disc.attached_sas_addr,
1709                        SAS_ADDR_SIZE);
1710                 *type = to_dev_type(&disc_resp->disc);
1711                 if (*type == 0)
1712                         memset(sas_addr, 0, SAS_ADDR_SIZE);
1713         }
1714         kfree(disc_resp);
1715         return res;
1716 }
1717
1718 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1719                               int from_phy, bool update)
1720 {
1721         struct expander_device *ex = &dev->ex_dev;
1722         int res = 0;
1723         int i;
1724
1725         for (i = from_phy; i < ex->num_phys; i++) {
1726                 int phy_change_count = 0;
1727
1728                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1729                 switch (res) {
1730                 case SMP_RESP_PHY_VACANT:
1731                 case SMP_RESP_NO_PHY:
1732                         continue;
1733                 case SMP_RESP_FUNC_ACC:
1734                         break;
1735                 default:
1736                         return res;
1737                 }
1738
1739                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1740                         if (update)
1741                                 ex->ex_phy[i].phy_change_count =
1742                                         phy_change_count;
1743                         *phy_id = i;
1744                         return 0;
1745                 }
1746         }
1747         return 0;
1748 }
1749
1750 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1751 {
1752         int res;
1753         u8  *rg_req;
1754         struct smp_rg_resp  *rg_resp;
1755
1756         rg_req = alloc_smp_req(RG_REQ_SIZE);
1757         if (!rg_req)
1758                 return -ENOMEM;
1759
1760         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1761         if (!rg_resp) {
1762                 kfree(rg_req);
1763                 return -ENOMEM;
1764         }
1765
1766         rg_req[1] = SMP_REPORT_GENERAL;
1767
1768         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1769                                RG_RESP_SIZE);
1770         if (res)
1771                 goto out;
1772         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1773                 res = rg_resp->result;
1774                 goto out;
1775         }
1776
1777         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1778 out:
1779         kfree(rg_resp);
1780         kfree(rg_req);
1781         return res;
1782 }
1783 /**
1784  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1785  * @dev:domain device to be detect.
1786  * @src_dev: the device which originated BROADCAST(CHANGE).
1787  *
1788  * Add self-configuration expander support. Suppose two expander cascading,
1789  * when the first level expander is self-configuring, hotplug the disks in
1790  * second level expander, BROADCAST(CHANGE) will not only be originated
1791  * in the second level expander, but also be originated in the first level
1792  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1793  * expander changed count in two level expanders will all increment at least
1794  * once, but the phy which chang count has changed is the source device which
1795  * we concerned.
1796  */
1797
1798 static int sas_find_bcast_dev(struct domain_device *dev,
1799                               struct domain_device **src_dev)
1800 {
1801         struct expander_device *ex = &dev->ex_dev;
1802         int ex_change_count = -1;
1803         int phy_id = -1;
1804         int res;
1805         struct domain_device *ch;
1806
1807         res = sas_get_ex_change_count(dev, &ex_change_count);
1808         if (res)
1809                 goto out;
1810         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1811                 /* Just detect if this expander phys phy change count changed,
1812                 * in order to determine if this expander originate BROADCAST,
1813                 * and do not update phy change count field in our structure.
1814                 */
1815                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1816                 if (phy_id != -1) {
1817                         *src_dev = dev;
1818                         ex->ex_change_count = ex_change_count;
1819                         pr_info("ex %016llx phy%02d change count has changed\n",
1820                                 SAS_ADDR(dev->sas_addr), phy_id);
1821                         return res;
1822                 } else
1823                         pr_info("ex %016llx phys DID NOT change\n",
1824                                 SAS_ADDR(dev->sas_addr));
1825         }
1826         list_for_each_entry(ch, &ex->children, siblings) {
1827                 if (dev_is_expander(ch->dev_type)) {
1828                         res = sas_find_bcast_dev(ch, src_dev);
1829                         if (*src_dev)
1830                                 return res;
1831                 }
1832         }
1833 out:
1834         return res;
1835 }
1836
1837 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1838 {
1839         struct expander_device *ex = &dev->ex_dev;
1840         struct domain_device *child, *n;
1841
1842         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1843                 set_bit(SAS_DEV_GONE, &child->state);
1844                 if (dev_is_expander(child->dev_type))
1845                         sas_unregister_ex_tree(port, child);
1846                 else
1847                         sas_unregister_dev(port, child);
1848         }
1849         sas_unregister_dev(port, dev);
1850 }
1851
1852 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1853                                          int phy_id, bool last)
1854 {
1855         struct expander_device *ex_dev = &parent->ex_dev;
1856         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1857         struct domain_device *child, *n, *found = NULL;
1858         if (last) {
1859                 list_for_each_entry_safe(child, n,
1860                         &ex_dev->children, siblings) {
1861                         if (SAS_ADDR(child->sas_addr) ==
1862                             SAS_ADDR(phy->attached_sas_addr)) {
1863                                 set_bit(SAS_DEV_GONE, &child->state);
1864                                 if (dev_is_expander(child->dev_type))
1865                                         sas_unregister_ex_tree(parent->port, child);
1866                                 else
1867                                         sas_unregister_dev(parent->port, child);
1868                                 found = child;
1869                                 break;
1870                         }
1871                 }
1872                 sas_disable_routing(parent, phy->attached_sas_addr);
1873         }
1874         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1875         if (phy->port) {
1876                 sas_port_delete_phy(phy->port, phy->phy);
1877                 sas_device_set_phy(found, phy->port);
1878                 if (phy->port->num_phys == 0)
1879                         list_add_tail(&phy->port->del_list,
1880                                 &parent->port->sas_port_del_list);
1881                 phy->port = NULL;
1882         }
1883 }
1884
1885 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1886                                           const int level)
1887 {
1888         struct expander_device *ex_root = &root->ex_dev;
1889         struct domain_device *child;
1890         int res = 0;
1891
1892         list_for_each_entry(child, &ex_root->children, siblings) {
1893                 if (dev_is_expander(child->dev_type)) {
1894                         struct sas_expander_device *ex =
1895                                 rphy_to_expander_device(child->rphy);
1896
1897                         if (level > ex->level)
1898                                 res = sas_discover_bfs_by_root_level(child,
1899                                                                      level);
1900                         else if (level == ex->level)
1901                                 res = sas_ex_discover_devices(child, -1);
1902                 }
1903         }
1904         return res;
1905 }
1906
1907 static int sas_discover_bfs_by_root(struct domain_device *dev)
1908 {
1909         int res;
1910         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1911         int level = ex->level+1;
1912
1913         res = sas_ex_discover_devices(dev, -1);
1914         if (res)
1915                 goto out;
1916         do {
1917                 res = sas_discover_bfs_by_root_level(dev, level);
1918                 mb();
1919                 level += 1;
1920         } while (level <= dev->port->disc.max_level);
1921 out:
1922         return res;
1923 }
1924
1925 static int sas_discover_new(struct domain_device *dev, int phy_id)
1926 {
1927         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1928         struct domain_device *child;
1929         int res;
1930
1931         pr_debug("ex %016llx phy%02d new device attached\n",
1932                  SAS_ADDR(dev->sas_addr), phy_id);
1933         res = sas_ex_phy_discover(dev, phy_id);
1934         if (res)
1935                 return res;
1936
1937         if (sas_ex_join_wide_port(dev, phy_id))
1938                 return 0;
1939
1940         res = sas_ex_discover_devices(dev, phy_id);
1941         if (res)
1942                 return res;
1943         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1944                 if (SAS_ADDR(child->sas_addr) ==
1945                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1946                         if (dev_is_expander(child->dev_type))
1947                                 res = sas_discover_bfs_by_root(child);
1948                         break;
1949                 }
1950         }
1951         return res;
1952 }
1953
1954 static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
1955 {
1956         if (old == new)
1957                 return true;
1958
1959         /* treat device directed resets as flutter, if we went
1960          * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
1961          */
1962         if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
1963             (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
1964                 return true;
1965
1966         return false;
1967 }
1968
1969 static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
1970                               bool last, int sibling)
1971 {
1972         struct expander_device *ex = &dev->ex_dev;
1973         struct ex_phy *phy = &ex->ex_phy[phy_id];
1974         enum sas_device_type type = SAS_PHY_UNUSED;
1975         u8 sas_addr[SAS_ADDR_SIZE];
1976         char msg[80] = "";
1977         int res;
1978
1979         if (!last)
1980                 sprintf(msg, ", part of a wide port with phy%02d", sibling);
1981
1982         pr_debug("ex %016llx rediscovering phy%02d%s\n",
1983                  SAS_ADDR(dev->sas_addr), phy_id, msg);
1984
1985         memset(sas_addr, 0, SAS_ADDR_SIZE);
1986         res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
1987         switch (res) {
1988         case SMP_RESP_NO_PHY:
1989                 phy->phy_state = PHY_NOT_PRESENT;
1990                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1991                 return res;
1992         case SMP_RESP_PHY_VACANT:
1993                 phy->phy_state = PHY_VACANT;
1994                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1995                 return res;
1996         case SMP_RESP_FUNC_ACC:
1997                 break;
1998         case -ECOMM:
1999                 break;
2000         default:
2001                 return res;
2002         }
2003
2004         if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
2005                 phy->phy_state = PHY_EMPTY;
2006                 sas_unregister_devs_sas_addr(dev, phy_id, last);
2007                 /*
2008                  * Even though the PHY is empty, for convenience we discover
2009                  * the PHY to update the PHY info, like negotiated linkrate.
2010                  */
2011                 sas_ex_phy_discover(dev, phy_id);
2012                 return res;
2013         } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
2014                    dev_type_flutter(type, phy->attached_dev_type)) {
2015                 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
2016                 char *action = "";
2017
2018                 sas_ex_phy_discover(dev, phy_id);
2019
2020                 if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
2021                         action = ", needs recovery";
2022                 pr_debug("ex %016llx phy%02d broadcast flutter%s\n",
2023                          SAS_ADDR(dev->sas_addr), phy_id, action);
2024                 return res;
2025         }
2026
2027         /* we always have to delete the old device when we went here */
2028         pr_info("ex %016llx phy%02d replace %016llx\n",
2029                 SAS_ADDR(dev->sas_addr), phy_id,
2030                 SAS_ADDR(phy->attached_sas_addr));
2031         sas_unregister_devs_sas_addr(dev, phy_id, last);
2032
2033         return sas_discover_new(dev, phy_id);
2034 }
2035
2036 /**
2037  * sas_rediscover - revalidate the domain.
2038  * @dev:domain device to be detect.
2039  * @phy_id: the phy id will be detected.
2040  *
2041  * NOTE: this process _must_ quit (return) as soon as any connection
2042  * errors are encountered.  Connection recovery is done elsewhere.
2043  * Discover process only interrogates devices in order to discover the
2044  * domain.For plugging out, we un-register the device only when it is
2045  * the last phy in the port, for other phys in this port, we just delete it
2046  * from the port.For inserting, we do discovery when it is the
2047  * first phy,for other phys in this port, we add it to the port to
2048  * forming the wide-port.
2049  */
2050 static int sas_rediscover(struct domain_device *dev, const int phy_id)
2051 {
2052         struct expander_device *ex = &dev->ex_dev;
2053         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
2054         int res = 0;
2055         int i;
2056         bool last = true;       /* is this the last phy of the port */
2057
2058         pr_debug("ex %016llx phy%02d originated BROADCAST(CHANGE)\n",
2059                  SAS_ADDR(dev->sas_addr), phy_id);
2060
2061         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2062                 for (i = 0; i < ex->num_phys; i++) {
2063                         struct ex_phy *phy = &ex->ex_phy[i];
2064
2065                         if (i == phy_id)
2066                                 continue;
2067                         if (SAS_ADDR(phy->attached_sas_addr) ==
2068                             SAS_ADDR(changed_phy->attached_sas_addr)) {
2069                                 last = false;
2070                                 break;
2071                         }
2072                 }
2073                 res = sas_rediscover_dev(dev, phy_id, last, i);
2074         } else
2075                 res = sas_discover_new(dev, phy_id);
2076         return res;
2077 }
2078
2079 /**
2080  * sas_ex_revalidate_domain - revalidate the domain
2081  * @port_dev: port domain device.
2082  *
2083  * NOTE: this process _must_ quit (return) as soon as any connection
2084  * errors are encountered.  Connection recovery is done elsewhere.
2085  * Discover process only interrogates devices in order to discover the
2086  * domain.
2087  */
2088 int sas_ex_revalidate_domain(struct domain_device *port_dev)
2089 {
2090         int res;
2091         struct domain_device *dev = NULL;
2092
2093         res = sas_find_bcast_dev(port_dev, &dev);
2094         if (res == 0 && dev) {
2095                 struct expander_device *ex = &dev->ex_dev;
2096                 int i = 0, phy_id;
2097
2098                 do {
2099                         phy_id = -1;
2100                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
2101                         if (phy_id == -1)
2102                                 break;
2103                         res = sas_rediscover(dev, phy_id);
2104                         i = phy_id + 1;
2105                 } while (i < ex->num_phys);
2106         }
2107         return res;
2108 }
2109
2110 void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
2111                 struct sas_rphy *rphy)
2112 {
2113         struct domain_device *dev;
2114         unsigned int rcvlen = 0;
2115         int ret = -EINVAL;
2116
2117         /* no rphy means no smp target support (ie aic94xx host) */
2118         if (!rphy)
2119                 return sas_smp_host_handler(job, shost);
2120
2121         switch (rphy->identify.device_type) {
2122         case SAS_EDGE_EXPANDER_DEVICE:
2123         case SAS_FANOUT_EXPANDER_DEVICE:
2124                 break;
2125         default:
2126                 pr_err("%s: can we send a smp request to a device?\n",
2127                        __func__);
2128                 goto out;
2129         }
2130
2131         dev = sas_find_dev_by_rphy(rphy);
2132         if (!dev) {
2133                 pr_err("%s: fail to find a domain_device?\n", __func__);
2134                 goto out;
2135         }
2136
2137         /* do we need to support multiple segments? */
2138         if (job->request_payload.sg_cnt > 1 ||
2139             job->reply_payload.sg_cnt > 1) {
2140                 pr_info("%s: multiple segments req %u, rsp %u\n",
2141                         __func__, job->request_payload.payload_len,
2142                         job->reply_payload.payload_len);
2143                 goto out;
2144         }
2145
2146         ret = smp_execute_task_sg(dev, job->request_payload.sg_list,
2147                         job->reply_payload.sg_list);
2148         if (ret >= 0) {
2149                 /* bsg_job_done() requires the length received  */
2150                 rcvlen = job->reply_payload.payload_len - ret;
2151                 ret = 0;
2152         }
2153
2154 out:
2155         bsg_job_done(job, ret, rcvlen);
2156 }