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 <linux/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 static void sas_port_add_ex_phy(struct sas_port *port, struct ex_phy *ex_phy)
  30 {
  31         sas_port_add_phy(port, ex_phy->phy);
  32         ex_phy->port = port;
  33         ex_phy->phy_state = PHY_DEVICE_DISCOVERED;
  34 }
  35
  36 static void sas_ex_add_parent_port(struct domain_device *dev, int phy_id)
  37 {
  38         struct expander_device *ex = &dev->ex_dev;
  39         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
  40
  41         if (!ex->parent_port) {
  42                 ex->parent_port = sas_port_alloc(&dev->rphy->dev, phy_id);
  43                 /* FIXME: error handling */
  44                 BUG_ON(!ex->parent_port);
  45                 BUG_ON(sas_port_add(ex->parent_port));
  46                 sas_port_mark_backlink(ex->parent_port);
  47         }
  48         sas_port_add_ex_phy(ex->parent_port, ex_phy);
  49 }
  50
  51 /* ---------- SMP task management ---------- */
  52
  53 /* Give it some long enough timeout. In seconds. */
  54 #define SMP_TIMEOUT 10
  55
  56 static int smp_execute_task_sg(struct domain_device *dev,
  57                 struct scatterlist *req, struct scatterlist *resp)
  58 {
  59         int res, retry;
  60         struct sas_task *task = NULL;
  61         struct sas_internal *i =
  62                 to_sas_internal(dev->port->ha->shost->transportt);
  63         struct sas_ha_struct *ha = dev->port->ha;
  64
  65         pm_runtime_get_sync(ha->dev);
  66         mutex_lock(&dev->ex_dev.cmd_mutex);
  67         for (retry = 0; retry < 3; retry++) {
  68                 if (test_bit(SAS_DEV_GONE, &dev->state)) {
  69                         res = -ECOMM;
  70                         break;
  71                 }
  72
  73                 task = sas_alloc_slow_task(GFP_KERNEL);
  74                 if (!task) {
  75                         res = -ENOMEM;
  76                         break;
  77                 }
  78                 task->dev = dev;
  79                 task->task_proto = dev->tproto;
  80                 task->smp_task.smp_req = *req;
  81                 task->smp_task.smp_resp = *resp;
  82
  83                 task->task_done = sas_task_internal_done;
  84
  85                 task->slow_task->timer.function = sas_task_internal_timedout;
  86                 task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  87                 add_timer(&task->slow_task->timer);
  88
  89                 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
  90
  91                 if (res) {
  92                         del_timer_sync(&task->slow_task->timer);
  93                         pr_notice("executing SMP task failed:%d\n", res);
  94                         break;
  95                 }
  96
  97                 wait_for_completion(&task->slow_task->completion);
  98                 res = -ECOMM;
  99                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 100                         pr_notice("smp task timed out or aborted\n");
 101                         i->dft->lldd_abort_task(task);
 102                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 103                                 pr_notice("SMP task aborted and not done\n");
 104                                 break;
 105                         }
 106                 }
 107                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 108                     task->task_status.stat == SAS_SAM_STAT_GOOD) {
 109                         res = 0;
 110                         break;
 111                 }
 112                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 113                     task->task_status.stat == SAS_DATA_UNDERRUN) {
 114                         /* no error, but return the number of bytes of
 115                          * underrun */
 116                         res = task->task_status.residual;
 117                         break;
 118                 }
 119                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 120                     task->task_status.stat == SAS_DATA_OVERRUN) {
 121                         res = -EMSGSIZE;
 122                         break;
 123                 }
 124                 if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
 125                     task->task_status.stat == SAS_DEVICE_UNKNOWN)
 126                         break;
 127                 else {
 128                         pr_notice("%s: task to dev %016llx response: 0x%x status 0x%x\n",
 129                                   __func__,
 130                                   SAS_ADDR(dev->sas_addr),
 131                                   task->task_status.resp,
 132                                   task->task_status.stat);
 133                         sas_free_task(task);
 134                         task = NULL;
 135                 }
 136         }
 137         mutex_unlock(&dev->ex_dev.cmd_mutex);
 138         pm_runtime_put_sync(ha->dev);
 139
 140         BUG_ON(retry == 3 && task != NULL);
 141         sas_free_task(task);
 142         return res;
 143 }
 144
 145 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
 146                             void *resp, int resp_size)
 147 {
 148         struct scatterlist req_sg;
 149         struct scatterlist resp_sg;
 150
 151         sg_init_one(&req_sg, req, req_size);
 152         sg_init_one(&resp_sg, resp, resp_size);
 153         return smp_execute_task_sg(dev, &req_sg, &resp_sg);
 154 }
 155
 156 /* ---------- Allocations ---------- */
 157
 158 static inline void *alloc_smp_req(int size)
 159 {
 160         u8 *p = kzalloc(ALIGN(size, ARCH_DMA_MINALIGN), GFP_KERNEL);
 161         if (p)
 162                 p[0] = SMP_REQUEST;
 163         return p;
 164 }
 165
 166 static inline void *alloc_smp_resp(int size)
 167 {
 168         return kzalloc(size, GFP_KERNEL);
 169 }
 170
 171 static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
 172 {
 173         switch (phy->routing_attr) {
 174         case TABLE_ROUTING:
 175                 if (dev->ex_dev.t2t_supp)
 176                         return 'U';
 177                 else
 178                         return 'T';
 179         case DIRECT_ROUTING:
 180                 return 'D';
 181         case SUBTRACTIVE_ROUTING:
 182                 return 'S';
 183         default:
 184                 return '?';
 185         }
 186 }
 187
 188 static enum sas_device_type to_dev_type(struct discover_resp *dr)
 189 {
 190         /* This is detecting a failure to transmit initial dev to host
 191          * FIS as described in section J.5 of sas-2 r16
 192          */
 193         if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&
 194             dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
 195                 return SAS_SATA_PENDING;
 196         else
 197                 return dr->attached_dev_type;
 198 }
 199
 200 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 201                            struct smp_disc_resp *disc_resp)
 202 {
 203         enum sas_device_type dev_type;
 204         enum sas_linkrate linkrate;
 205         u8 sas_addr[SAS_ADDR_SIZE];
 206         struct discover_resp *dr = &disc_resp->disc;
 207         struct sas_ha_struct *ha = dev->port->ha;
 208         struct expander_device *ex = &dev->ex_dev;
 209         struct ex_phy *phy = &ex->ex_phy[phy_id];
 210         struct sas_rphy *rphy = dev->rphy;
 211         bool new_phy = !phy->phy;
 212         char *type;
 213
 214         if (new_phy) {
 215                 if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
 216                         return;
 217                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 218
 219                 /* FIXME: error_handling */
 220                 BUG_ON(!phy->phy);
 221         }
 222
 223         switch (disc_resp->result) {
 224         case SMP_RESP_PHY_VACANT:
 225                 phy->phy_state = PHY_VACANT;
 226                 break;
 227         default:
 228                 phy->phy_state = PHY_NOT_PRESENT;
 229                 break;
 230         case SMP_RESP_FUNC_ACC:
 231                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 232                 break;
 233         }
 234
 235         /* check if anything important changed to squelch debug */
 236         dev_type = phy->attached_dev_type;
 237         linkrate  = phy->linkrate;
 238         memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 239
 240         /* Handle vacant phy - rest of dr data is not valid so skip it */
 241         if (phy->phy_state == PHY_VACANT) {
 242                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 243                 phy->attached_dev_type = SAS_PHY_UNUSED;
 244                 if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
 245                         phy->phy_id = phy_id;
 246                         goto skip;
 247                 } else
 248                         goto out;
 249         }
 250
 251         phy->attached_dev_type = to_dev_type(dr);
 252         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 253                 goto out;
 254         phy->phy_id = phy_id;
 255         phy->linkrate = dr->linkrate;
 256         phy->attached_sata_host = dr->attached_sata_host;
 257         phy->attached_sata_dev  = dr->attached_sata_dev;
 258         phy->attached_sata_ps   = dr->attached_sata_ps;
 259         phy->attached_iproto = dr->iproto << 1;
 260         phy->attached_tproto = dr->tproto << 1;
 261         /* help some expanders that fail to zero sas_address in the 'no
 262          * device' case
 263          */
 264         if (phy->attached_dev_type == SAS_PHY_UNUSED)
 265                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 266         else
 267                 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 268         phy->attached_phy_id = dr->attached_phy_id;
 269         phy->phy_change_count = dr->change_count;
 270         phy->routing_attr = dr->routing_attr;
 271         phy->virtual = dr->virtual;
 272         phy->last_da_index = -1;
 273
 274         phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 275         phy->phy->identify.device_type = dr->attached_dev_type;
 276         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 277         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 278         if (!phy->attached_tproto && dr->attached_sata_dev)
 279                 phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
 280         phy->phy->identify.phy_identifier = phy_id;
 281         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 282         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 283         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 284         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 285         phy->phy->negotiated_linkrate = phy->linkrate;
 286         phy->phy->enabled = (phy->linkrate != SAS_PHY_DISABLED);
 287
 288  skip:
 289         if (new_phy)
 290                 if (sas_phy_add(phy->phy)) {
 291                         sas_phy_free(phy->phy);
 292                         return;
 293                 }
 294
 295  out:
 296         switch (phy->attached_dev_type) {
 297         case SAS_SATA_PENDING:
 298                 type = "stp pending";
 299                 break;
 300         case SAS_PHY_UNUSED:
 301                 type = "no device";
 302                 break;
 303         case SAS_END_DEVICE:
 304                 if (phy->attached_iproto) {
 305                         if (phy->attached_tproto)
 306                                 type = "host+target";
 307                         else
 308                                 type = "host";
 309                 } else {
 310                         if (dr->attached_sata_dev)
 311                                 type = "stp";
 312                         else
 313                                 type = "ssp";
 314                 }
 315                 break;
 316         case SAS_EDGE_EXPANDER_DEVICE:
 317         case SAS_FANOUT_EXPANDER_DEVICE:
 318                 type = "smp";
 319                 break;
 320         default:
 321                 type = "unknown";
 322         }
 323
 324         /* this routine is polled by libata error recovery so filter
 325          * unimportant messages
 326          */
 327         if (new_phy || phy->attached_dev_type != dev_type ||
 328             phy->linkrate != linkrate ||
 329             SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
 330                 /* pass */;
 331         else
 332                 return;
 333
 334         /* if the attached device type changed and ata_eh is active,
 335          * make sure we run revalidation when eh completes (see:
 336          * sas_enable_revalidation)
 337          */
 338         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 339                 set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
 340
 341         pr_debug("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
 342                  test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
 343                  SAS_ADDR(dev->sas_addr), phy->phy_id,
 344                  sas_route_char(dev, phy), phy->linkrate,
 345                  SAS_ADDR(phy->attached_sas_addr), type);
 346 }
 347
 348 /* check if we have an existing attached ata device on this expander phy */
 349 struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
 350 {
 351         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
 352         struct domain_device *dev;
 353         struct sas_rphy *rphy;
 354
 355         if (!ex_phy->port)
 356                 return NULL;
 357
 358         rphy = ex_phy->port->rphy;
 359         if (!rphy)
 360                 return NULL;
 361
 362         dev = sas_find_dev_by_rphy(rphy);
 363
 364         if (dev && dev_is_sata(dev))
 365                 return dev;
 366
 367         return NULL;
 368 }
 369
 370 #define DISCOVER_REQ_SIZE  16
 371 #define DISCOVER_RESP_SIZE sizeof(struct smp_disc_resp)
 372
 373 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 374                                       struct smp_disc_resp *disc_resp,
 375                                       int single)
 376 {
 377         struct discover_resp *dr = &disc_resp->disc;
 378         int res;
 379
 380         disc_req[9] = single;
 381
 382         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 383                                disc_resp, DISCOVER_RESP_SIZE);
 384         if (res)
 385                 return res;
 386         if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
 387                 pr_notice("Found loopback topology, just ignore it!\n");
 388                 return 0;
 389         }
 390         sas_set_ex_phy(dev, single, disc_resp);
 391         return 0;
 392 }
 393
 394 int sas_ex_phy_discover(struct domain_device *dev, int single)
 395 {
 396         struct expander_device *ex = &dev->ex_dev;
 397         int  res = 0;
 398         u8   *disc_req;
 399         struct smp_disc_resp *disc_resp;
 400
 401         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 402         if (!disc_req)
 403                 return -ENOMEM;
 404
 405         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
 406         if (!disc_resp) {
 407                 kfree(disc_req);
 408                 return -ENOMEM;
 409         }
 410
 411         disc_req[1] = SMP_DISCOVER;
 412
 413         if (0 <= single && single < ex->num_phys) {
 414                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 415         } else {
 416                 int i;
 417
 418                 for (i = 0; i < ex->num_phys; i++) {
 419                         res = sas_ex_phy_discover_helper(dev, disc_req,
 420                                                          disc_resp, i);
 421                         if (res)
 422                                 goto out_err;
 423                 }
 424         }
 425 out_err:
 426         kfree(disc_resp);
 427         kfree(disc_req);
 428         return res;
 429 }
 430
 431 static int sas_expander_discover(struct domain_device *dev)
 432 {
 433         struct expander_device *ex = &dev->ex_dev;
 434         int res;
 435
 436         ex->ex_phy = kcalloc(ex->num_phys, sizeof(*ex->ex_phy), GFP_KERNEL);
 437         if (!ex->ex_phy)
 438                 return -ENOMEM;
 439
 440         res = sas_ex_phy_discover(dev, -1);
 441         if (res)
 442                 goto out_err;
 443
 444         return 0;
 445  out_err:
 446         kfree(ex->ex_phy);
 447         ex->ex_phy = NULL;
 448         return res;
 449 }
 450
 451 #define MAX_EXPANDER_PHYS 128
 452
 453 #define RG_REQ_SIZE   8
 454 #define RG_RESP_SIZE  sizeof(struct smp_rg_resp)
 455
 456 static int sas_ex_general(struct domain_device *dev)
 457 {
 458         u8 *rg_req;
 459         struct smp_rg_resp *rg_resp;
 460         struct report_general_resp *rg;
 461         int res;
 462         int i;
 463
 464         rg_req = alloc_smp_req(RG_REQ_SIZE);
 465         if (!rg_req)
 466                 return -ENOMEM;
 467
 468         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 469         if (!rg_resp) {
 470                 kfree(rg_req);
 471                 return -ENOMEM;
 472         }
 473
 474         rg_req[1] = SMP_REPORT_GENERAL;
 475
 476         for (i = 0; i < 5; i++) {
 477                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 478                                        RG_RESP_SIZE);
 479
 480                 if (res) {
 481                         pr_notice("RG to ex %016llx failed:0x%x\n",
 482                                   SAS_ADDR(dev->sas_addr), res);
 483                         goto out;
 484                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 485                         pr_debug("RG:ex %016llx returned SMP result:0x%x\n",
 486                                  SAS_ADDR(dev->sas_addr), rg_resp->result);
 487                         res = rg_resp->result;
 488                         goto out;
 489                 }
 490
 491                 rg = &rg_resp->rg;
 492                 dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 493                 dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 494                 dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 495                 dev->ex_dev.t2t_supp = rg->t2t_supp;
 496                 dev->ex_dev.conf_route_table = rg->conf_route_table;
 497                 dev->ex_dev.configuring = rg->configuring;
 498                 memcpy(dev->ex_dev.enclosure_logical_id,
 499                        rg->enclosure_logical_id, 8);
 500
 501                 if (dev->ex_dev.configuring) {
 502                         pr_debug("RG: ex %016llx self-configuring...\n",
 503                                  SAS_ADDR(dev->sas_addr));
 504                         schedule_timeout_interruptible(5*HZ);
 505                 } else
 506                         break;
 507         }
 508 out:
 509         kfree(rg_req);
 510         kfree(rg_resp);
 511         return res;
 512 }
 513
 514 static void ex_assign_manuf_info(struct domain_device *dev, void
 515                                         *_mi_resp)
 516 {
 517         u8 *mi_resp = _mi_resp;
 518         struct sas_rphy *rphy = dev->rphy;
 519         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 520
 521         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 522         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 523         memcpy(edev->product_rev, mi_resp + 36,
 524                SAS_EXPANDER_PRODUCT_REV_LEN);
 525
 526         if (mi_resp[8] & 1) {
 527                 memcpy(edev->component_vendor_id, mi_resp + 40,
 528                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 529                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 530                 edev->component_revision_id = mi_resp[50];
 531         }
 532 }
 533
 534 #define MI_REQ_SIZE   8
 535 #define MI_RESP_SIZE 64
 536
 537 static int sas_ex_manuf_info(struct domain_device *dev)
 538 {
 539         u8 *mi_req;
 540         u8 *mi_resp;
 541         int res;
 542
 543         mi_req = alloc_smp_req(MI_REQ_SIZE);
 544         if (!mi_req)
 545                 return -ENOMEM;
 546
 547         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 548         if (!mi_resp) {
 549                 kfree(mi_req);
 550                 return -ENOMEM;
 551         }
 552
 553         mi_req[1] = SMP_REPORT_MANUF_INFO;
 554
 555         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp, MI_RESP_SIZE);
 556         if (res) {
 557                 pr_notice("MI: ex %016llx failed:0x%x\n",
 558                           SAS_ADDR(dev->sas_addr), res);
 559                 goto out;
 560         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 561                 pr_debug("MI ex %016llx returned SMP result:0x%x\n",
 562                          SAS_ADDR(dev->sas_addr), mi_resp[2]);
 563                 goto out;
 564         }
 565
 566         ex_assign_manuf_info(dev, mi_resp);
 567 out:
 568         kfree(mi_req);
 569         kfree(mi_resp);
 570         return res;
 571 }
 572
 573 #define PC_REQ_SIZE  44
 574 #define PC_RESP_SIZE 8
 575
 576 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 577                         enum phy_func phy_func,
 578                         struct sas_phy_linkrates *rates)
 579 {
 580         u8 *pc_req;
 581         u8 *pc_resp;
 582         int res;
 583
 584         pc_req = alloc_smp_req(PC_REQ_SIZE);
 585         if (!pc_req)
 586                 return -ENOMEM;
 587
 588         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 589         if (!pc_resp) {
 590                 kfree(pc_req);
 591                 return -ENOMEM;
 592         }
 593
 594         pc_req[1] = SMP_PHY_CONTROL;
 595         pc_req[9] = phy_id;
 596         pc_req[10] = phy_func;
 597         if (rates) {
 598                 pc_req[32] = rates->minimum_linkrate << 4;
 599                 pc_req[33] = rates->maximum_linkrate << 4;
 600         }
 601
 602         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp, PC_RESP_SIZE);
 603         if (res) {
 604                 pr_err("ex %016llx phy%02d PHY control failed: %d\n",
 605                        SAS_ADDR(dev->sas_addr), phy_id, res);
 606         } else if (pc_resp[2] != SMP_RESP_FUNC_ACC) {
 607                 pr_err("ex %016llx phy%02d PHY control failed: function result 0x%x\n",
 608                        SAS_ADDR(dev->sas_addr), phy_id, pc_resp[2]);
 609                 res = pc_resp[2];
 610         }
 611         kfree(pc_resp);
 612         kfree(pc_req);
 613         return res;
 614 }
 615
 616 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 617 {
 618         struct expander_device *ex = &dev->ex_dev;
 619         struct ex_phy *phy = &ex->ex_phy[phy_id];
 620
 621         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 622         phy->linkrate = SAS_PHY_DISABLED;
 623 }
 624
 625 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 626 {
 627         struct expander_device *ex = &dev->ex_dev;
 628         int i;
 629
 630         for (i = 0; i < ex->num_phys; i++) {
 631                 struct ex_phy *phy = &ex->ex_phy[i];
 632
 633                 if (phy->phy_state == PHY_VACANT ||
 634                     phy->phy_state == PHY_NOT_PRESENT)
 635                         continue;
 636
 637                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 638                         sas_ex_disable_phy(dev, i);
 639         }
 640 }
 641
 642 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 643                                             u8 *sas_addr)
 644 {
 645         struct domain_device *dev;
 646
 647         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 648                 return 1;
 649         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 650                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 651                         return 1;
 652         }
 653         return 0;
 654 }
 655
 656 #define RPEL_REQ_SIZE   16
 657 #define RPEL_RESP_SIZE  32
 658 int sas_smp_get_phy_events(struct sas_phy *phy)
 659 {
 660         int res;
 661         u8 *req;
 662         u8 *resp;
 663         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 664         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 665
 666         req = alloc_smp_req(RPEL_REQ_SIZE);
 667         if (!req)
 668                 return -ENOMEM;
 669
 670         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 671         if (!resp) {
 672                 kfree(req);
 673                 return -ENOMEM;
 674         }
 675
 676         req[1] = SMP_REPORT_PHY_ERR_LOG;
 677         req[9] = phy->number;
 678
 679         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 680                                resp, RPEL_RESP_SIZE);
 681
 682         if (res)
 683                 goto out;
 684
 685         phy->invalid_dword_count = get_unaligned_be32(&resp[12]);
 686         phy->running_disparity_error_count = get_unaligned_be32(&resp[16]);
 687         phy->loss_of_dword_sync_count = get_unaligned_be32(&resp[20]);
 688         phy->phy_reset_problem_count = get_unaligned_be32(&resp[24]);
 689
 690  out:
 691         kfree(req);
 692         kfree(resp);
 693         return res;
 694
 695 }
 696
 697 #ifdef CONFIG_SCSI_SAS_ATA
 698
 699 #define RPS_REQ_SIZE  16
 700 #define RPS_RESP_SIZE sizeof(struct smp_rps_resp)
 701
 702 int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
 703                             struct smp_rps_resp *rps_resp)
 704 {
 705         int res;
 706         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 707         u8 *resp = (u8 *)rps_resp;
 708
 709         if (!rps_req)
 710                 return -ENOMEM;
 711
 712         rps_req[1] = SMP_REPORT_PHY_SATA;
 713         rps_req[9] = phy_id;
 714
 715         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 716                                rps_resp, RPS_RESP_SIZE);
 717
 718         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 719          * standards cockup here.  sas-2 explicitly specifies the FIS
 720          * should be encoded so that FIS type is in resp[24].
 721          * However, some expanders endian reverse this.  Undo the
 722          * reversal here */
 723         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 724                 int i;
 725
 726                 for (i = 0; i < 5; i++) {
 727                         int j = 24 + (i*4);
 728                         u8 a, b;
 729                         a = resp[j + 0];
 730                         b = resp[j + 1];
 731                         resp[j + 0] = resp[j + 3];
 732                         resp[j + 1] = resp[j + 2];
 733                         resp[j + 2] = b;
 734                         resp[j + 3] = a;
 735                 }
 736         }
 737
 738         kfree(rps_req);
 739         return res;
 740 }
 741 #endif
 742
 743 static void sas_ex_get_linkrate(struct domain_device *parent,
 744                                        struct domain_device *child,
 745                                        struct ex_phy *parent_phy)
 746 {
 747         struct expander_device *parent_ex = &parent->ex_dev;
 748         struct sas_port *port;
 749         int i;
 750
 751         child->pathways = 0;
 752
 753         port = parent_phy->port;
 754
 755         for (i = 0; i < parent_ex->num_phys; i++) {
 756                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 757
 758                 if (phy->phy_state == PHY_VACANT ||
 759                     phy->phy_state == PHY_NOT_PRESENT)
 760                         continue;
 761
 762                 if (sas_phy_match_dev_addr(child, phy)) {
 763                         child->min_linkrate = min(parent->min_linkrate,
 764                                                   phy->linkrate);
 765                         child->max_linkrate = max(parent->max_linkrate,
 766                                                   phy->linkrate);
 767                         child->pathways++;
 768                         sas_port_add_phy(port, phy->phy);
 769                 }
 770         }
 771         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 772         child->pathways = min(child->pathways, parent->pathways);
 773 }
 774
 775 static int sas_ex_add_dev(struct domain_device *parent, struct ex_phy *phy,
 776                           struct domain_device *child, int phy_id)
 777 {
 778         struct sas_rphy *rphy;
 779         int res;
 780
 781         child->dev_type = SAS_END_DEVICE;
 782         rphy = sas_end_device_alloc(phy->port);
 783         if (!rphy)
 784                 return -ENOMEM;
 785
 786         child->tproto = phy->attached_tproto;
 787         sas_init_dev(child);
 788
 789         child->rphy = rphy;
 790         get_device(&rphy->dev);
 791         rphy->identify.phy_identifier = phy_id;
 792         sas_fill_in_rphy(child, rphy);
 793
 794         list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 795
 796         res = sas_notify_lldd_dev_found(child);
 797         if (res) {
 798                 pr_notice("notify lldd for device %016llx at %016llx:%02d returned 0x%x\n",
 799                           SAS_ADDR(child->sas_addr),
 800                           SAS_ADDR(parent->sas_addr), phy_id, res);
 801                 sas_rphy_free(child->rphy);
 802                 list_del(&child->disco_list_node);
 803                 return res;
 804         }
 805
 806         return 0;
 807 }
 808
 809 static struct domain_device *sas_ex_discover_end_dev(
 810         struct domain_device *parent, int phy_id)
 811 {
 812         struct expander_device *parent_ex = &parent->ex_dev;
 813         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 814         struct domain_device *child = NULL;
 815         int res;
 816
 817         if (phy->attached_sata_host || phy->attached_sata_ps)
 818                 return NULL;
 819
 820         child = sas_alloc_device();
 821         if (!child)
 822                 return NULL;
 823
 824         kref_get(&parent->kref);
 825         child->parent = parent;
 826         child->port   = parent->port;
 827         child->iproto = phy->attached_iproto;
 828         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 829         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 830         if (!phy->port) {
 831                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 832                 if (unlikely(!phy->port))
 833                         goto out_err;
 834                 if (unlikely(sas_port_add(phy->port) != 0)) {
 835                         sas_port_free(phy->port);
 836                         goto out_err;
 837                 }
 838         }
 839         sas_ex_get_linkrate(parent, child, phy);
 840         sas_device_set_phy(child, phy->port);
 841
 842         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 843                 res = sas_ata_add_dev(parent, phy, child, phy_id);
 844         } else if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 845                 res = sas_ex_add_dev(parent, phy, child, phy_id);
 846         } else {
 847                 pr_notice("target proto 0x%x at %016llx:0x%x not handled\n",
 848                           phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 849                           phy_id);
 850                 res = -ENODEV;
 851         }
 852
 853         if (res)
 854                 goto out_free;
 855
 856         list_add_tail(&child->siblings, &parent_ex->children);
 857         return child;
 858
 859  out_free:
 860         sas_port_delete(phy->port);
 861  out_err:
 862         phy->port = NULL;
 863         sas_put_device(child);
 864         return NULL;
 865 }
 866
 867 /* See if this phy is part of a wide port */
 868 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 869 {
 870         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 871         int i;
 872
 873         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 874                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 875
 876                 if (ephy == phy)
 877                         continue;
 878
 879                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 880                             SAS_ADDR_SIZE) && ephy->port) {
 881                         sas_port_add_ex_phy(ephy->port, phy);
 882                         return true;
 883                 }
 884         }
 885
 886         return false;
 887 }
 888
 889 static struct domain_device *sas_ex_discover_expander(
 890         struct domain_device *parent, int phy_id)
 891 {
 892         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 893         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 894         struct domain_device *child = NULL;
 895         struct sas_rphy *rphy;
 896         struct sas_expander_device *edev;
 897         struct asd_sas_port *port;
 898         int res;
 899
 900         if (phy->routing_attr == DIRECT_ROUTING) {
 901                 pr_warn("ex %016llx:%02d:D <--> ex %016llx:0x%x is not allowed\n",
 902                         SAS_ADDR(parent->sas_addr), phy_id,
 903                         SAS_ADDR(phy->attached_sas_addr),
 904                         phy->attached_phy_id);
 905                 return NULL;
 906         }
 907         child = sas_alloc_device();
 908         if (!child)
 909                 return NULL;
 910
 911         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 912         /* FIXME: better error handling */
 913         BUG_ON(sas_port_add(phy->port) != 0);
 914
 915
 916         switch (phy->attached_dev_type) {
 917         case SAS_EDGE_EXPANDER_DEVICE:
 918                 rphy = sas_expander_alloc(phy->port,
 919                                           SAS_EDGE_EXPANDER_DEVICE);
 920                 break;
 921         case SAS_FANOUT_EXPANDER_DEVICE:
 922                 rphy = sas_expander_alloc(phy->port,
 923                                           SAS_FANOUT_EXPANDER_DEVICE);
 924                 break;
 925         default:
 926                 rphy = NULL;    /* shut gcc up */
 927                 BUG();
 928         }
 929         port = parent->port;
 930         child->rphy = rphy;
 931         get_device(&rphy->dev);
 932         edev = rphy_to_expander_device(rphy);
 933         child->dev_type = phy->attached_dev_type;
 934         kref_get(&parent->kref);
 935         child->parent = parent;
 936         child->port = port;
 937         child->iproto = phy->attached_iproto;
 938         child->tproto = phy->attached_tproto;
 939         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 940         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 941         sas_ex_get_linkrate(parent, child, phy);
 942         edev->level = parent_ex->level + 1;
 943         parent->port->disc.max_level = max(parent->port->disc.max_level,
 944                                            edev->level);
 945         sas_init_dev(child);
 946         sas_fill_in_rphy(child, rphy);
 947         sas_rphy_add(rphy);
 948
 949         spin_lock_irq(&parent->port->dev_list_lock);
 950         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 951         spin_unlock_irq(&parent->port->dev_list_lock);
 952
 953         res = sas_discover_expander(child);
 954         if (res) {
 955                 sas_rphy_delete(rphy);
 956                 spin_lock_irq(&parent->port->dev_list_lock);
 957                 list_del(&child->dev_list_node);
 958                 spin_unlock_irq(&parent->port->dev_list_lock);
 959                 sas_put_device(child);
 960                 sas_port_delete(phy->port);
 961                 phy->port = NULL;
 962                 return NULL;
 963         }
 964         list_add_tail(&child->siblings, &parent->ex_dev.children);
 965         return child;
 966 }
 967
 968 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 969 {
 970         struct expander_device *ex = &dev->ex_dev;
 971         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 972         struct domain_device *child = NULL;
 973         int res = 0;
 974
 975         /* Phy state */
 976         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 977                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 978                         res = sas_ex_phy_discover(dev, phy_id);
 979                 if (res)
 980                         return res;
 981         }
 982
 983         /* Parent and domain coherency */
 984         if (!dev->parent && sas_phy_match_port_addr(dev->port, ex_phy)) {
 985                 sas_ex_add_parent_port(dev, phy_id);
 986                 return 0;
 987         }
 988         if (dev->parent && sas_phy_match_dev_addr(dev->parent, ex_phy)) {
 989                 sas_ex_add_parent_port(dev, phy_id);
 990                 if (ex_phy->routing_attr == TABLE_ROUTING)
 991                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 992                 return 0;
 993         }
 994
 995         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 996                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 997
 998         if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
 999                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
1000                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1001                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
1002                 }
1003                 return 0;
1004         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
1005                 return 0;
1006
1007         if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
1008             ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
1009             ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1010             ex_phy->attached_dev_type != SAS_SATA_PENDING) {
1011                 pr_warn("unknown device type(0x%x) attached to ex %016llx phy%02d\n",
1012                         ex_phy->attached_dev_type,
1013                         SAS_ADDR(dev->sas_addr),
1014                         phy_id);
1015                 return 0;
1016         }
1017
1018         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
1019         if (res) {
1020                 pr_notice("configure routing for dev %016llx reported 0x%x. Forgotten\n",
1021                           SAS_ADDR(ex_phy->attached_sas_addr), res);
1022                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
1023                 return res;
1024         }
1025
1026         if (sas_ex_join_wide_port(dev, phy_id)) {
1027                 pr_debug("Attaching ex phy%02d to wide port %016llx\n",
1028                          phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1029                 return res;
1030         }
1031
1032         switch (ex_phy->attached_dev_type) {
1033         case SAS_END_DEVICE:
1034         case SAS_SATA_PENDING:
1035                 child = sas_ex_discover_end_dev(dev, phy_id);
1036                 break;
1037         case SAS_FANOUT_EXPANDER_DEVICE:
1038                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1039                         pr_debug("second fanout expander %016llx phy%02d attached to ex %016llx phy%02d\n",
1040                                  SAS_ADDR(ex_phy->attached_sas_addr),
1041                                  ex_phy->attached_phy_id,
1042                                  SAS_ADDR(dev->sas_addr),
1043                                  phy_id);
1044                         sas_ex_disable_phy(dev, phy_id);
1045                         return res;
1046                 } else
1047                         memcpy(dev->port->disc.fanout_sas_addr,
1048                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1049                 fallthrough;
1050         case SAS_EDGE_EXPANDER_DEVICE:
1051                 child = sas_ex_discover_expander(dev, phy_id);
1052                 break;
1053         default:
1054                 break;
1055         }
1056
1057         if (!child)
1058                 pr_notice("ex %016llx phy%02d failed to discover\n",
1059                           SAS_ADDR(dev->sas_addr), phy_id);
1060         return res;
1061 }
1062
1063 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1064 {
1065         struct expander_device *ex = &dev->ex_dev;
1066         int i;
1067
1068         for (i = 0; i < ex->num_phys; i++) {
1069                 struct ex_phy *phy = &ex->ex_phy[i];
1070
1071                 if (phy->phy_state == PHY_VACANT ||
1072                     phy->phy_state == PHY_NOT_PRESENT)
1073                         continue;
1074
1075                 if (dev_is_expander(phy->attached_dev_type) &&
1076                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1077
1078                         memcpy(sub_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
1079
1080                         return 1;
1081                 }
1082         }
1083         return 0;
1084 }
1085
1086 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1087 {
1088         struct expander_device *ex = &dev->ex_dev;
1089         struct domain_device *child;
1090         u8 sub_addr[SAS_ADDR_SIZE] = {0, };
1091
1092         list_for_each_entry(child, &ex->children, siblings) {
1093                 if (!dev_is_expander(child->dev_type))
1094                         continue;
1095                 if (sub_addr[0] == 0) {
1096                         sas_find_sub_addr(child, sub_addr);
1097                         continue;
1098                 } else {
1099                         u8 s2[SAS_ADDR_SIZE];
1100
1101                         if (sas_find_sub_addr(child, s2) &&
1102                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1103
1104                                 pr_notice("ex %016llx->%016llx-?->%016llx diverges from subtractive boundary %016llx\n",
1105                                           SAS_ADDR(dev->sas_addr),
1106                                           SAS_ADDR(child->sas_addr),
1107                                           SAS_ADDR(s2),
1108                                           SAS_ADDR(sub_addr));
1109
1110                                 sas_ex_disable_port(child, s2);
1111                         }
1112                 }
1113         }
1114         return 0;
1115 }
1116 /**
1117  * sas_ex_discover_devices - discover devices attached to this expander
1118  * @dev: pointer to the expander domain device
1119  * @single: if you want to do a single phy, else set to -1;
1120  *
1121  * Configure this expander for use with its devices and register the
1122  * devices of this expander.
1123  */
1124 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1125 {
1126         struct expander_device *ex = &dev->ex_dev;
1127         int i = 0, end = ex->num_phys;
1128         int res = 0;
1129
1130         if (0 <= single && single < end) {
1131                 i = single;
1132                 end = i+1;
1133         }
1134
1135         for ( ; i < end; i++) {
1136                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1137
1138                 if (ex_phy->phy_state == PHY_VACANT ||
1139                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1140                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1141                         continue;
1142
1143                 switch (ex_phy->linkrate) {
1144                 case SAS_PHY_DISABLED:
1145                 case SAS_PHY_RESET_PROBLEM:
1146                 case SAS_SATA_PORT_SELECTOR:
1147                         continue;
1148                 default:
1149                         res = sas_ex_discover_dev(dev, i);
1150                         if (res)
1151                                 break;
1152                         continue;
1153                 }
1154         }
1155
1156         if (!res)
1157                 sas_check_level_subtractive_boundary(dev);
1158
1159         return res;
1160 }
1161
1162 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1163 {
1164         struct expander_device *ex = &dev->ex_dev;
1165         int i;
1166         u8  *sub_sas_addr = NULL;
1167
1168         if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
1169                 return 0;
1170
1171         for (i = 0; i < ex->num_phys; i++) {
1172                 struct ex_phy *phy = &ex->ex_phy[i];
1173
1174                 if (phy->phy_state == PHY_VACANT ||
1175                     phy->phy_state == PHY_NOT_PRESENT)
1176                         continue;
1177
1178                 if (dev_is_expander(phy->attached_dev_type) &&
1179                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1180
1181                         if (!sub_sas_addr)
1182                                 sub_sas_addr = &phy->attached_sas_addr[0];
1183                         else if (SAS_ADDR(sub_sas_addr) !=
1184                                  SAS_ADDR(phy->attached_sas_addr)) {
1185
1186                                 pr_notice("ex %016llx phy%02d diverges(%016llx) on subtractive boundary(%016llx). Disabled\n",
1187                                           SAS_ADDR(dev->sas_addr), i,
1188                                           SAS_ADDR(phy->attached_sas_addr),
1189                                           SAS_ADDR(sub_sas_addr));
1190                                 sas_ex_disable_phy(dev, i);
1191                         }
1192                 }
1193         }
1194         return 0;
1195 }
1196
1197 static void sas_print_parent_topology_bug(struct domain_device *child,
1198                                                  struct ex_phy *parent_phy,
1199                                                  struct ex_phy *child_phy)
1200 {
1201         static const char *ex_type[] = {
1202                 [SAS_EDGE_EXPANDER_DEVICE] = "edge",
1203                 [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
1204         };
1205         struct domain_device *parent = child->parent;
1206
1207         pr_notice("%s ex %016llx phy%02d <--> %s ex %016llx phy%02d has %c:%c routing link!\n",
1208                   ex_type[parent->dev_type],
1209                   SAS_ADDR(parent->sas_addr),
1210                   parent_phy->phy_id,
1211
1212                   ex_type[child->dev_type],
1213                   SAS_ADDR(child->sas_addr),
1214                   child_phy->phy_id,
1215
1216                   sas_route_char(parent, parent_phy),
1217                   sas_route_char(child, child_phy));
1218 }
1219
1220 static bool sas_eeds_valid(struct domain_device *parent,
1221                            struct domain_device *child)
1222 {
1223         struct sas_discovery *disc = &parent->port->disc;
1224
1225         return (SAS_ADDR(disc->eeds_a) == SAS_ADDR(parent->sas_addr) ||
1226                 SAS_ADDR(disc->eeds_a) == SAS_ADDR(child->sas_addr)) &&
1227                (SAS_ADDR(disc->eeds_b) == SAS_ADDR(parent->sas_addr) ||
1228                 SAS_ADDR(disc->eeds_b) == SAS_ADDR(child->sas_addr));
1229 }
1230
1231 static int sas_check_eeds(struct domain_device *child,
1232                           struct ex_phy *parent_phy,
1233                           struct ex_phy *child_phy)
1234 {
1235         int res = 0;
1236         struct domain_device *parent = child->parent;
1237         struct sas_discovery *disc = &parent->port->disc;
1238
1239         if (SAS_ADDR(disc->fanout_sas_addr) != 0) {
1240                 res = -ENODEV;
1241                 pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n",
1242                         SAS_ADDR(parent->sas_addr),
1243                         parent_phy->phy_id,
1244                         SAS_ADDR(child->sas_addr),
1245                         child_phy->phy_id,
1246                         SAS_ADDR(disc->fanout_sas_addr));
1247         } else if (SAS_ADDR(disc->eeds_a) == 0) {
1248                 memcpy(disc->eeds_a, parent->sas_addr, SAS_ADDR_SIZE);
1249                 memcpy(disc->eeds_b, child->sas_addr, SAS_ADDR_SIZE);
1250         } else if (!sas_eeds_valid(parent, child)) {
1251                 res = -ENODEV;
1252                 pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n",
1253                         SAS_ADDR(parent->sas_addr),
1254                         parent_phy->phy_id,
1255                         SAS_ADDR(child->sas_addr),
1256                         child_phy->phy_id);
1257         }
1258
1259         return res;
1260 }
1261
1262 static int sas_check_edge_expander_topo(struct domain_device *child,
1263                                         struct ex_phy *parent_phy)
1264 {
1265         struct expander_device *child_ex = &child->ex_dev;
1266         struct expander_device *parent_ex = &child->parent->ex_dev;
1267         struct ex_phy *child_phy;
1268
1269         child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1270
1271         if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1272                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1273                     child_phy->routing_attr != TABLE_ROUTING)
1274                         goto error;
1275         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1276                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING)
1277                         return sas_check_eeds(child, parent_phy, child_phy);
1278                 else if (child_phy->routing_attr != TABLE_ROUTING)
1279                         goto error;
1280         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1281                 if (child_phy->routing_attr != SUBTRACTIVE_ROUTING &&
1282                     (child_phy->routing_attr != TABLE_ROUTING ||
1283                      !child_ex->t2t_supp || !parent_ex->t2t_supp))
1284                         goto error;
1285         }
1286
1287         return 0;
1288 error:
1289         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1290         return -ENODEV;
1291 }
1292
1293 static int sas_check_fanout_expander_topo(struct domain_device *child,
1294                                           struct ex_phy *parent_phy)
1295 {
1296         struct expander_device *child_ex = &child->ex_dev;
1297         struct ex_phy *child_phy;
1298
1299         child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1300
1301         if (parent_phy->routing_attr == TABLE_ROUTING &&
1302             child_phy->routing_attr == SUBTRACTIVE_ROUTING)
1303                 return 0;
1304
1305         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1306
1307         return -ENODEV;
1308 }
1309
1310 static int sas_check_parent_topology(struct domain_device *child)
1311 {
1312         struct expander_device *parent_ex;
1313         int i;
1314         int res = 0;
1315
1316         if (!child->parent)
1317                 return 0;
1318
1319         if (!dev_is_expander(child->parent->dev_type))
1320                 return 0;
1321
1322         parent_ex = &child->parent->ex_dev;
1323
1324         for (i = 0; i < parent_ex->num_phys; i++) {
1325                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1326
1327                 if (parent_phy->phy_state == PHY_VACANT ||
1328                     parent_phy->phy_state == PHY_NOT_PRESENT)
1329                         continue;
1330
1331                 if (!sas_phy_match_dev_addr(child, parent_phy))
1332                         continue;
1333
1334                 switch (child->parent->dev_type) {
1335                 case SAS_EDGE_EXPANDER_DEVICE:
1336                         if (sas_check_edge_expander_topo(child, parent_phy))
1337                                 res = -ENODEV;
1338                         break;
1339                 case SAS_FANOUT_EXPANDER_DEVICE:
1340                         if (sas_check_fanout_expander_topo(child, parent_phy))
1341                                 res = -ENODEV;
1342                         break;
1343                 default:
1344                         break;
1345                 }
1346         }
1347
1348         return res;
1349 }
1350
1351 #define RRI_REQ_SIZE  16
1352 #define RRI_RESP_SIZE 44
1353
1354 static int sas_configure_present(struct domain_device *dev, int phy_id,
1355                                  u8 *sas_addr, int *index, int *present)
1356 {
1357         int i, res = 0;
1358         struct expander_device *ex = &dev->ex_dev;
1359         struct ex_phy *phy = &ex->ex_phy[phy_id];
1360         u8 *rri_req;
1361         u8 *rri_resp;
1362
1363         *present = 0;
1364         *index = 0;
1365
1366         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1367         if (!rri_req)
1368                 return -ENOMEM;
1369
1370         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1371         if (!rri_resp) {
1372                 kfree(rri_req);
1373                 return -ENOMEM;
1374         }
1375
1376         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1377         rri_req[9] = phy_id;
1378
1379         for (i = 0; i < ex->max_route_indexes ; i++) {
1380                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1381                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1382                                        RRI_RESP_SIZE);
1383                 if (res)
1384                         goto out;
1385                 res = rri_resp[2];
1386                 if (res == SMP_RESP_NO_INDEX) {
1387                         pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1388                                 SAS_ADDR(dev->sas_addr), phy_id, i);
1389                         goto out;
1390                 } else if (res != SMP_RESP_FUNC_ACC) {
1391                         pr_notice("%s: dev %016llx phy%02d index 0x%x result 0x%x\n",
1392                                   __func__, SAS_ADDR(dev->sas_addr), phy_id,
1393                                   i, res);
1394                         goto out;
1395                 }
1396                 if (SAS_ADDR(sas_addr) != 0) {
1397                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1398                                 *index = i;
1399                                 if ((rri_resp[12] & 0x80) == 0x80)
1400                                         *present = 0;
1401                                 else
1402                                         *present = 1;
1403                                 goto out;
1404                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1405                                 *index = i;
1406                                 *present = 0;
1407                                 goto out;
1408                         }
1409                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1410                            phy->last_da_index < i) {
1411                         phy->last_da_index = i;
1412                         *index = i;
1413                         *present = 0;
1414                         goto out;
1415                 }
1416         }
1417         res = -1;
1418 out:
1419         kfree(rri_req);
1420         kfree(rri_resp);
1421         return res;
1422 }
1423
1424 #define CRI_REQ_SIZE  44
1425 #define CRI_RESP_SIZE  8
1426
1427 static int sas_configure_set(struct domain_device *dev, int phy_id,
1428                              u8 *sas_addr, int index, int include)
1429 {
1430         int res;
1431         u8 *cri_req;
1432         u8 *cri_resp;
1433
1434         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1435         if (!cri_req)
1436                 return -ENOMEM;
1437
1438         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1439         if (!cri_resp) {
1440                 kfree(cri_req);
1441                 return -ENOMEM;
1442         }
1443
1444         cri_req[1] = SMP_CONF_ROUTE_INFO;
1445         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1446         cri_req[9] = phy_id;
1447         if (SAS_ADDR(sas_addr) == 0 || !include)
1448                 cri_req[12] |= 0x80;
1449         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1450
1451         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1452                                CRI_RESP_SIZE);
1453         if (res)
1454                 goto out;
1455         res = cri_resp[2];
1456         if (res == SMP_RESP_NO_INDEX) {
1457                 pr_warn("overflow of indexes: dev %016llx phy%02d index 0x%x\n",
1458                         SAS_ADDR(dev->sas_addr), phy_id, index);
1459         }
1460 out:
1461         kfree(cri_req);
1462         kfree(cri_resp);
1463         return res;
1464 }
1465
1466 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1467                                     u8 *sas_addr, int include)
1468 {
1469         int index;
1470         int present;
1471         int res;
1472
1473         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1474         if (res)
1475                 return res;
1476         if (include ^ present)
1477                 return sas_configure_set(dev, phy_id, sas_addr, index,
1478                                          include);
1479
1480         return res;
1481 }
1482
1483 /**
1484  * sas_configure_parent - configure routing table of parent
1485  * @parent: parent expander
1486  * @child: child expander
1487  * @sas_addr: SAS port identifier of device directly attached to child
1488  * @include: whether or not to include @child in the expander routing table
1489  */
1490 static int sas_configure_parent(struct domain_device *parent,
1491                                 struct domain_device *child,
1492                                 u8 *sas_addr, int include)
1493 {
1494         struct expander_device *ex_parent = &parent->ex_dev;
1495         int res = 0;
1496         int i;
1497
1498         if (parent->parent) {
1499                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1500                                            include);
1501                 if (res)
1502                         return res;
1503         }
1504
1505         if (ex_parent->conf_route_table == 0) {
1506                 pr_debug("ex %016llx has self-configuring routing table\n",
1507                          SAS_ADDR(parent->sas_addr));
1508                 return 0;
1509         }
1510
1511         for (i = 0; i < ex_parent->num_phys; i++) {
1512                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1513
1514                 if ((phy->routing_attr == TABLE_ROUTING) &&
1515                     sas_phy_match_dev_addr(child, phy)) {
1516                         res = sas_configure_phy(parent, i, sas_addr, include);
1517                         if (res)
1518                                 return res;
1519                 }
1520         }
1521
1522         return res;
1523 }
1524
1525 /**
1526  * sas_configure_routing - configure routing
1527  * @dev: expander device
1528  * @sas_addr: port identifier of device directly attached to the expander device
1529  */
1530 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1531 {
1532         if (dev->parent)
1533                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1534         return 0;
1535 }
1536
1537 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1538 {
1539         if (dev->parent)
1540                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1541         return 0;
1542 }
1543
1544 /**
1545  * sas_discover_expander - expander discovery
1546  * @dev: pointer to expander domain device
1547  *
1548  * See comment in sas_discover_sata().
1549  */
1550 static int sas_discover_expander(struct domain_device *dev)
1551 {
1552         int res;
1553
1554         res = sas_notify_lldd_dev_found(dev);
1555         if (res)
1556                 return res;
1557
1558         res = sas_ex_general(dev);
1559         if (res)
1560                 goto out_err;
1561         res = sas_ex_manuf_info(dev);
1562         if (res)
1563                 goto out_err;
1564
1565         res = sas_expander_discover(dev);
1566         if (res) {
1567                 pr_warn("expander %016llx discovery failed(0x%x)\n",
1568                         SAS_ADDR(dev->sas_addr), res);
1569                 goto out_err;
1570         }
1571
1572         sas_check_ex_subtractive_boundary(dev);
1573         res = sas_check_parent_topology(dev);
1574         if (res)
1575                 goto out_err;
1576         return 0;
1577 out_err:
1578         sas_notify_lldd_dev_gone(dev);
1579         return res;
1580 }
1581
1582 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1583 {
1584         int res = 0;
1585         struct domain_device *dev;
1586
1587         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1588                 if (dev_is_expander(dev->dev_type)) {
1589                         struct sas_expander_device *ex =
1590                                 rphy_to_expander_device(dev->rphy);
1591
1592                         if (level == ex->level)
1593                                 res = sas_ex_discover_devices(dev, -1);
1594                         else if (level > 0)
1595                                 res = sas_ex_discover_devices(port->port_dev, -1);
1596
1597                 }
1598         }
1599
1600         return res;
1601 }
1602
1603 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1604 {
1605         int res;
1606         int level;
1607
1608         do {
1609                 level = port->disc.max_level;
1610                 res = sas_ex_level_discovery(port, level);
1611                 mb();
1612         } while (level < port->disc.max_level);
1613
1614         return res;
1615 }
1616
1617 int sas_discover_root_expander(struct domain_device *dev)
1618 {
1619         int res;
1620         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1621
1622         res = sas_rphy_add(dev->rphy);
1623         if (res)
1624                 goto out_err;
1625
1626         ex->level = dev->port->disc.max_level; /* 0 */
1627         res = sas_discover_expander(dev);
1628         if (res)
1629                 goto out_err2;
1630
1631         sas_ex_bfs_disc(dev->port);
1632
1633         return res;
1634
1635 out_err2:
1636         sas_rphy_remove(dev->rphy);
1637 out_err:
1638         return res;
1639 }
1640
1641 /* ---------- Domain revalidation ---------- */
1642
1643 static void sas_get_sas_addr_and_dev_type(struct smp_disc_resp *disc_resp,
1644                                           u8 *sas_addr,
1645                                           enum sas_device_type *type)
1646 {
1647         memcpy(sas_addr, disc_resp->disc.attached_sas_addr, SAS_ADDR_SIZE);
1648         *type = to_dev_type(&disc_resp->disc);
1649         if (*type == SAS_PHY_UNUSED)
1650                 memset(sas_addr, 0, SAS_ADDR_SIZE);
1651 }
1652
1653 static int sas_get_phy_discover(struct domain_device *dev,
1654                                 int phy_id, struct smp_disc_resp *disc_resp)
1655 {
1656         int res;
1657         u8 *disc_req;
1658
1659         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1660         if (!disc_req)
1661                 return -ENOMEM;
1662
1663         disc_req[1] = SMP_DISCOVER;
1664         disc_req[9] = phy_id;
1665
1666         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1667                                disc_resp, DISCOVER_RESP_SIZE);
1668         if (res)
1669                 goto out;
1670         if (disc_resp->result != SMP_RESP_FUNC_ACC)
1671                 res = disc_resp->result;
1672 out:
1673         kfree(disc_req);
1674         return res;
1675 }
1676
1677 static int sas_get_phy_change_count(struct domain_device *dev,
1678                                     int phy_id, int *pcc)
1679 {
1680         int res;
1681         struct smp_disc_resp *disc_resp;
1682
1683         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1684         if (!disc_resp)
1685                 return -ENOMEM;
1686
1687         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1688         if (!res)
1689                 *pcc = disc_resp->disc.change_count;
1690
1691         kfree(disc_resp);
1692         return res;
1693 }
1694
1695 int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1696                              u8 *sas_addr, enum sas_device_type *type)
1697 {
1698         int res;
1699         struct smp_disc_resp *disc_resp;
1700
1701         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1702         if (!disc_resp)
1703                 return -ENOMEM;
1704
1705         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1706         if (res == 0)
1707                 sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, type);
1708         kfree(disc_resp);
1709         return res;
1710 }
1711
1712 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1713                               int from_phy, bool update)
1714 {
1715         struct expander_device *ex = &dev->ex_dev;
1716         int res = 0;
1717         int i;
1718
1719         for (i = from_phy; i < ex->num_phys; i++) {
1720                 int phy_change_count = 0;
1721
1722                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1723                 switch (res) {
1724                 case SMP_RESP_PHY_VACANT:
1725                 case SMP_RESP_NO_PHY:
1726                         continue;
1727                 case SMP_RESP_FUNC_ACC:
1728                         break;
1729                 default:
1730                         return res;
1731                 }
1732
1733                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1734                         if (update)
1735                                 ex->ex_phy[i].phy_change_count =
1736                                         phy_change_count;
1737                         *phy_id = i;
1738                         return 0;
1739                 }
1740         }
1741         return 0;
1742 }
1743
1744 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1745 {
1746         int res;
1747         u8  *rg_req;
1748         struct smp_rg_resp  *rg_resp;
1749
1750         rg_req = alloc_smp_req(RG_REQ_SIZE);
1751         if (!rg_req)
1752                 return -ENOMEM;
1753
1754         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1755         if (!rg_resp) {
1756                 kfree(rg_req);
1757                 return -ENOMEM;
1758         }
1759
1760         rg_req[1] = SMP_REPORT_GENERAL;
1761
1762         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1763                                RG_RESP_SIZE);
1764         if (res)
1765                 goto out;
1766         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1767                 res = rg_resp->result;
1768                 goto out;
1769         }
1770
1771         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1772 out:
1773         kfree(rg_resp);
1774         kfree(rg_req);
1775         return res;
1776 }
1777 /**
1778  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1779  * @dev:domain device to be detect.
1780  * @src_dev: the device which originated BROADCAST(CHANGE).
1781  *
1782  * Add self-configuration expander support. Suppose two expander cascading,
1783  * when the first level expander is self-configuring, hotplug the disks in
1784  * second level expander, BROADCAST(CHANGE) will not only be originated
1785  * in the second level expander, but also be originated in the first level
1786  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1787  * expander changed count in two level expanders will all increment at least
1788  * once, but the phy which chang count has changed is the source device which
1789  * we concerned.
1790  */
1791
1792 static int sas_find_bcast_dev(struct domain_device *dev,
1793                               struct domain_device **src_dev)
1794 {
1795         struct expander_device *ex = &dev->ex_dev;
1796         int ex_change_count = -1;
1797         int phy_id = -1;
1798         int res;
1799         struct domain_device *ch;
1800
1801         res = sas_get_ex_change_count(dev, &ex_change_count);
1802         if (res)
1803                 goto out;
1804         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1805                 /* Just detect if this expander phys phy change count changed,
1806                 * in order to determine if this expander originate BROADCAST,
1807                 * and do not update phy change count field in our structure.
1808                 */
1809                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1810                 if (phy_id != -1) {
1811                         *src_dev = dev;
1812                         ex->ex_change_count = ex_change_count;
1813                         pr_info("ex %016llx phy%02d change count has changed\n",
1814                                 SAS_ADDR(dev->sas_addr), phy_id);
1815                         return res;
1816                 } else
1817                         pr_info("ex %016llx phys DID NOT change\n",
1818                                 SAS_ADDR(dev->sas_addr));
1819         }
1820         list_for_each_entry(ch, &ex->children, siblings) {
1821                 if (dev_is_expander(ch->dev_type)) {
1822                         res = sas_find_bcast_dev(ch, src_dev);
1823                         if (*src_dev)
1824                                 return res;
1825                 }
1826         }
1827 out:
1828         return res;
1829 }
1830
1831 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1832 {
1833         struct expander_device *ex = &dev->ex_dev;
1834         struct domain_device *child, *n;
1835
1836         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1837                 set_bit(SAS_DEV_GONE, &child->state);
1838                 if (dev_is_expander(child->dev_type))
1839                         sas_unregister_ex_tree(port, child);
1840                 else
1841                         sas_unregister_dev(port, child);
1842         }
1843         sas_unregister_dev(port, dev);
1844 }
1845
1846 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1847                                          int phy_id, bool last)
1848 {
1849         struct expander_device *ex_dev = &parent->ex_dev;
1850         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1851         struct domain_device *child, *n, *found = NULL;
1852         if (last) {
1853                 list_for_each_entry_safe(child, n,
1854                         &ex_dev->children, siblings) {
1855                         if (sas_phy_match_dev_addr(child, phy)) {
1856                                 set_bit(SAS_DEV_GONE, &child->state);
1857                                 if (dev_is_expander(child->dev_type))
1858                                         sas_unregister_ex_tree(parent->port, child);
1859                                 else
1860                                         sas_unregister_dev(parent->port, child);
1861                                 found = child;
1862                                 break;
1863                         }
1864                 }
1865                 sas_disable_routing(parent, phy->attached_sas_addr);
1866         }
1867         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1868         if (phy->port) {
1869                 sas_port_delete_phy(phy->port, phy->phy);
1870                 sas_device_set_phy(found, phy->port);
1871                 if (phy->port->num_phys == 0) {
1872                         list_add_tail(&phy->port->del_list,
1873                                 &parent->port->sas_port_del_list);
1874                         if (ex_dev->parent_port == phy->port)
1875                                 ex_dev->parent_port = NULL;
1876                 }
1877                 phy->port = NULL;
1878         }
1879 }
1880
1881 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1882                                           const int level)
1883 {
1884         struct expander_device *ex_root = &root->ex_dev;
1885         struct domain_device *child;
1886         int res = 0;
1887
1888         list_for_each_entry(child, &ex_root->children, siblings) {
1889                 if (dev_is_expander(child->dev_type)) {
1890                         struct sas_expander_device *ex =
1891                                 rphy_to_expander_device(child->rphy);
1892
1893                         if (level > ex->level)
1894                                 res = sas_discover_bfs_by_root_level(child,
1895                                                                      level);
1896                         else if (level == ex->level)
1897                                 res = sas_ex_discover_devices(child, -1);
1898                 }
1899         }
1900         return res;
1901 }
1902
1903 static int sas_discover_bfs_by_root(struct domain_device *dev)
1904 {
1905         int res;
1906         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1907         int level = ex->level+1;
1908
1909         res = sas_ex_discover_devices(dev, -1);
1910         if (res)
1911                 goto out;
1912         do {
1913                 res = sas_discover_bfs_by_root_level(dev, level);
1914                 mb();
1915                 level += 1;
1916         } while (level <= dev->port->disc.max_level);
1917 out:
1918         return res;
1919 }
1920
1921 static int sas_discover_new(struct domain_device *dev, int phy_id)
1922 {
1923         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1924         struct domain_device *child;
1925         int res;
1926
1927         pr_debug("ex %016llx phy%02d new device attached\n",
1928                  SAS_ADDR(dev->sas_addr), phy_id);
1929         res = sas_ex_phy_discover(dev, phy_id);
1930         if (res)
1931                 return res;
1932
1933         if (sas_ex_join_wide_port(dev, phy_id))
1934                 return 0;
1935
1936         res = sas_ex_discover_devices(dev, phy_id);
1937         if (res)
1938                 return res;
1939         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1940                 if (sas_phy_match_dev_addr(child, ex_phy)) {
1941                         if (dev_is_expander(child->dev_type))
1942                                 res = sas_discover_bfs_by_root(child);
1943                         break;
1944                 }
1945         }
1946         return res;
1947 }
1948
1949 static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
1950 {
1951         if (old == new)
1952                 return true;
1953
1954         /* treat device directed resets as flutter, if we went
1955          * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
1956          */
1957         if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
1958             (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
1959                 return true;
1960
1961         return false;
1962 }
1963
1964 static int sas_rediscover_dev(struct domain_device *dev, int phy_id,
1965                               bool last, int sibling)
1966 {
1967         struct expander_device *ex = &dev->ex_dev;
1968         struct ex_phy *phy = &ex->ex_phy[phy_id];
1969         enum sas_device_type type = SAS_PHY_UNUSED;
1970         struct smp_disc_resp *disc_resp;
1971         u8 sas_addr[SAS_ADDR_SIZE];
1972         char msg[80] = "";
1973         int res;
1974
1975         if (!last)
1976                 sprintf(msg, ", part of a wide port with phy%02d", sibling);
1977
1978         pr_debug("ex %016llx rediscovering phy%02d%s\n",
1979                  SAS_ADDR(dev->sas_addr), phy_id, msg);
1980
1981         memset(sas_addr, 0, SAS_ADDR_SIZE);
1982         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1983         if (!disc_resp)
1984                 return -ENOMEM;
1985
1986         res = sas_get_phy_discover(dev, phy_id, disc_resp);
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                 goto out_free_resp;
1992         case SMP_RESP_PHY_VACANT:
1993                 phy->phy_state = PHY_VACANT;
1994                 sas_unregister_devs_sas_addr(dev, phy_id, last);
1995                 goto out_free_resp;
1996         case SMP_RESP_FUNC_ACC:
1997                 break;
1998         case -ECOMM:
1999                 break;
2000         default:
2001                 goto out_free_resp;
2002         }
2003
2004         if (res == 0)
2005                 sas_get_sas_addr_and_dev_type(disc_resp, sas_addr, &type);
2006
2007         if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
2008                 phy->phy_state = PHY_EMPTY;
2009                 sas_unregister_devs_sas_addr(dev, phy_id, last);
2010                 /*
2011                  * Even though the PHY is empty, for convenience we update
2012                  * the PHY info, like negotiated linkrate.
2013                  */
2014                 if (res == 0)
2015                         sas_set_ex_phy(dev, phy_id, disc_resp);
2016                 goto out_free_resp;
2017         } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
2018                    dev_type_flutter(type, phy->attached_dev_type)) {
2019                 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
2020                 char *action = "";
2021
2022                 sas_ex_phy_discover(dev, phy_id);
2023
2024                 if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
2025                         action = ", needs recovery";
2026                 pr_debug("ex %016llx phy%02d broadcast flutter%s\n",
2027                          SAS_ADDR(dev->sas_addr), phy_id, action);
2028                 goto out_free_resp;
2029         }
2030
2031         /* we always have to delete the old device when we went here */
2032         pr_info("ex %016llx phy%02d replace %016llx\n",
2033                 SAS_ADDR(dev->sas_addr), phy_id,
2034                 SAS_ADDR(phy->attached_sas_addr));
2035         sas_unregister_devs_sas_addr(dev, phy_id, last);
2036
2037         res = sas_discover_new(dev, phy_id);
2038 out_free_resp:
2039         kfree(disc_resp);
2040         return res;
2041 }
2042
2043 /**
2044  * sas_rediscover - revalidate the domain.
2045  * @dev:domain device to be detect.
2046  * @phy_id: the phy id will be detected.
2047  *
2048  * NOTE: this process _must_ quit (return) as soon as any connection
2049  * errors are encountered.  Connection recovery is done elsewhere.
2050  * Discover process only interrogates devices in order to discover the
2051  * domain.For plugging out, we un-register the device only when it is
2052  * the last phy in the port, for other phys in this port, we just delete it
2053  * from the port.For inserting, we do discovery when it is the
2054  * first phy,for other phys in this port, we add it to the port to
2055  * forming the wide-port.
2056  */
2057 static int sas_rediscover(struct domain_device *dev, const int phy_id)
2058 {
2059         struct expander_device *ex = &dev->ex_dev;
2060         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
2061         int res = 0;
2062         int i;
2063         bool last = true;       /* is this the last phy of the port */
2064
2065         pr_debug("ex %016llx phy%02d originated BROADCAST(CHANGE)\n",
2066                  SAS_ADDR(dev->sas_addr), phy_id);
2067
2068         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2069                 for (i = 0; i < ex->num_phys; i++) {
2070                         struct ex_phy *phy = &ex->ex_phy[i];
2071
2072                         if (i == phy_id)
2073                                 continue;
2074                         if (sas_phy_addr_match(phy, changed_phy)) {
2075                                 last = false;
2076                                 break;
2077                         }
2078                 }
2079                 res = sas_rediscover_dev(dev, phy_id, last, i);
2080         } else
2081                 res = sas_discover_new(dev, phy_id);
2082         return res;
2083 }
2084
2085 /**
2086  * sas_ex_revalidate_domain - revalidate the domain
2087  * @port_dev: port domain device.
2088  *
2089  * NOTE: this process _must_ quit (return) as soon as any connection
2090  * errors are encountered.  Connection recovery is done elsewhere.
2091  * Discover process only interrogates devices in order to discover the
2092  * domain.
2093  */
2094 int sas_ex_revalidate_domain(struct domain_device *port_dev)
2095 {
2096         int res;
2097         struct domain_device *dev = NULL;
2098
2099         res = sas_find_bcast_dev(port_dev, &dev);
2100         if (res == 0 && dev) {
2101                 struct expander_device *ex = &dev->ex_dev;
2102                 int i = 0, phy_id;
2103
2104                 do {
2105                         phy_id = -1;
2106                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
2107                         if (phy_id == -1)
2108                                 break;
2109                         res = sas_rediscover(dev, phy_id);
2110                         i = phy_id + 1;
2111                 } while (i < ex->num_phys);
2112         }
2113         return res;
2114 }
2115
2116 int sas_find_attached_phy_id(struct expander_device *ex_dev,
2117                              struct domain_device *dev)
2118 {
2119         struct ex_phy *phy;
2120         int phy_id;
2121
2122         for (phy_id = 0; phy_id < ex_dev->num_phys; phy_id++) {
2123                 phy = &ex_dev->ex_phy[phy_id];
2124                 if (sas_phy_match_dev_addr(dev, phy))
2125                         return phy_id;
2126         }
2127
2128         return -ENODEV;
2129 }
2130 EXPORT_SYMBOL_GPL(sas_find_attached_phy_id);
2131
2132 void sas_smp_handler(struct bsg_job *job, struct Scsi_Host *shost,
2133                 struct sas_rphy *rphy)
2134 {
2135         struct domain_device *dev;
2136         unsigned int rcvlen = 0;
2137         int ret = -EINVAL;
2138
2139         /* no rphy means no smp target support (ie aic94xx host) */
2140         if (!rphy)
2141                 return sas_smp_host_handler(job, shost);
2142
2143         switch (rphy->identify.device_type) {
2144         case SAS_EDGE_EXPANDER_DEVICE:
2145         case SAS_FANOUT_EXPANDER_DEVICE:
2146                 break;
2147         default:
2148                 pr_err("%s: can we send a smp request to a device?\n",
2149                        __func__);
2150                 goto out;
2151         }
2152
2153         dev = sas_find_dev_by_rphy(rphy);
2154         if (!dev) {
2155                 pr_err("%s: fail to find a domain_device?\n", __func__);
2156                 goto out;
2157         }
2158
2159         /* do we need to support multiple segments? */
2160         if (job->request_payload.sg_cnt > 1 ||
2161             job->reply_payload.sg_cnt > 1) {
2162                 pr_info("%s: multiple segments req %u, rsp %u\n",
2163                         __func__, job->request_payload.payload_len,
2164                         job->reply_payload.payload_len);
2165                 goto out;
2166         }
2167
2168         ret = smp_execute_task_sg(dev, job->request_payload.sg_list,
2169                         job->reply_payload.sg_list);
2170         if (ret >= 0) {
2171                 /* bsg_job_done() requires the length received  */
2172                 rcvlen = job->reply_payload.payload_len - ret;
2173                 ret = 0;
2174         }
2175
2176 out:
2177         bsg_job_done(job, ret, rcvlen);
2178 }