drivers/scsi/libsas/sas_expander.c

   1 /*
   2  * Serial Attached SCSI (SAS) Expander discovery and configuration
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  22  *
  23  */
  24
  25 #include <linux/scatterlist.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/slab.h>
  28
  29 #include "sas_internal.h"
  30
  31 #include <scsi/sas_ata.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_sas.h>
  34 #include "../scsi_sas_internal.h"
  35
  36 static int sas_discover_expander(struct domain_device *dev);
  37 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  38 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  39                              u8 *sas_addr, int include);
  40 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  41
  42 /* ---------- SMP task management ---------- */
  43
  44 static void smp_task_timedout(unsigned long _task)
  45 {
  46         struct sas_task *task = (void *) _task;
  47         unsigned long flags;
  48
  49         spin_lock_irqsave(&task->task_state_lock, flags);
  50         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
  51                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  52                 complete(&task->slow_task->completion);
  53         }
  54         spin_unlock_irqrestore(&task->task_state_lock, flags);
  55 }
  56
  57 static void smp_task_done(struct sas_task *task)
  58 {
  59         del_timer(&task->slow_task->timer);
  60         complete(&task->slow_task->completion);
  61 }
  62
  63 /* Give it some long enough timeout. In seconds. */
  64 #define SMP_TIMEOUT 10
  65
  66 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  67                             void *resp, int resp_size)
  68 {
  69         int res, retry;
  70         struct sas_task *task = NULL;
  71         struct sas_internal *i =
  72                 to_sas_internal(dev->port->ha->core.shost->transportt);
  73
  74         mutex_lock(&dev->ex_dev.cmd_mutex);
  75         for (retry = 0; retry < 3; retry++) {
  76                 if (test_bit(SAS_DEV_GONE, &dev->state)) {
  77                         res = -ECOMM;
  78                         break;
  79                 }
  80
  81                 task = sas_alloc_slow_task(GFP_KERNEL);
  82                 if (!task) {
  83                         res = -ENOMEM;
  84                         break;
  85                 }
  86                 task->dev = dev;
  87                 task->task_proto = dev->tproto;
  88                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  89                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  90
  91                 task->task_done = smp_task_done;
  92
  93                 task->slow_task->timer.data = (unsigned long) task;
  94                 task->slow_task->timer.function = smp_task_timedout;
  95                 task->slow_task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  96                 add_timer(&task->slow_task->timer);
  97
  98                 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
  99
 100                 if (res) {
 101                         del_timer(&task->slow_task->timer);
 102                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
 103                         break;
 104                 }
 105
 106                 wait_for_completion(&task->slow_task->completion);
 107                 res = -ECOMM;
 108                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 109                         SAS_DPRINTK("smp task timed out or aborted\n");
 110                         i->dft->lldd_abort_task(task);
 111                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 112                                 SAS_DPRINTK("SMP task aborted and not done\n");
 113                                 break;
 114                         }
 115                 }
 116                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 117                     task->task_status.stat == SAM_STAT_GOOD) {
 118                         res = 0;
 119                         break;
 120                 }
 121                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 122                     task->task_status.stat == SAS_DATA_UNDERRUN) {
 123                         /* no error, but return the number of bytes of
 124                          * underrun */
 125                         res = task->task_status.residual;
 126                         break;
 127                 }
 128                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 129                     task->task_status.stat == SAS_DATA_OVERRUN) {
 130                         res = -EMSGSIZE;
 131                         break;
 132                 }
 133                 if (task->task_status.resp == SAS_TASK_UNDELIVERED &&
 134                     task->task_status.stat == SAS_DEVICE_UNKNOWN)
 135                         break;
 136                 else {
 137                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 138                                     "status 0x%x\n", __func__,
 139                                     SAS_ADDR(dev->sas_addr),
 140                                     task->task_status.resp,
 141                                     task->task_status.stat);
 142                         sas_free_task(task);
 143                         task = NULL;
 144                 }
 145         }
 146         mutex_unlock(&dev->ex_dev.cmd_mutex);
 147
 148         BUG_ON(retry == 3 && task != NULL);
 149         sas_free_task(task);
 150         return res;
 151 }
 152
 153 /* ---------- Allocations ---------- */
 154
 155 static inline void *alloc_smp_req(int size)
 156 {
 157         u8 *p = kzalloc(size, GFP_KERNEL);
 158         if (p)
 159                 p[0] = SMP_REQUEST;
 160         return p;
 161 }
 162
 163 static inline void *alloc_smp_resp(int size)
 164 {
 165         return kzalloc(size, GFP_KERNEL);
 166 }
 167
 168 static char sas_route_char(struct domain_device *dev, struct ex_phy *phy)
 169 {
 170         switch (phy->routing_attr) {
 171         case TABLE_ROUTING:
 172                 if (dev->ex_dev.t2t_supp)
 173                         return 'U';
 174                 else
 175                         return 'T';
 176         case DIRECT_ROUTING:
 177                 return 'D';
 178         case SUBTRACTIVE_ROUTING:
 179                 return 'S';
 180         default:
 181                 return '?';
 182         }
 183 }
 184
 185 static enum sas_device_type to_dev_type(struct discover_resp *dr)
 186 {
 187         /* This is detecting a failure to transmit initial dev to host
 188          * FIS as described in section J.5 of sas-2 r16
 189          */
 190         if (dr->attached_dev_type == SAS_PHY_UNUSED && dr->attached_sata_dev &&
 191             dr->linkrate >= SAS_LINK_RATE_1_5_GBPS)
 192                 return SAS_SATA_PENDING;
 193         else
 194                 return dr->attached_dev_type;
 195 }
 196
 197 static void sas_set_ex_phy(struct domain_device *dev, int phy_id, void *rsp)
 198 {
 199         enum sas_device_type dev_type;
 200         enum sas_linkrate linkrate;
 201         u8 sas_addr[SAS_ADDR_SIZE];
 202         struct smp_resp *resp = rsp;
 203         struct discover_resp *dr = &resp->disc;
 204         struct sas_ha_struct *ha = dev->port->ha;
 205         struct expander_device *ex = &dev->ex_dev;
 206         struct ex_phy *phy = &ex->ex_phy[phy_id];
 207         struct sas_rphy *rphy = dev->rphy;
 208         bool new_phy = !phy->phy;
 209         char *type;
 210
 211         if (new_phy) {
 212                 if (WARN_ON_ONCE(test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)))
 213                         return;
 214                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 215
 216                 /* FIXME: error_handling */
 217                 BUG_ON(!phy->phy);
 218         }
 219
 220         switch (resp->result) {
 221         case SMP_RESP_PHY_VACANT:
 222                 phy->phy_state = PHY_VACANT;
 223                 break;
 224         default:
 225                 phy->phy_state = PHY_NOT_PRESENT;
 226                 break;
 227         case SMP_RESP_FUNC_ACC:
 228                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 229                 break;
 230         }
 231
 232         /* check if anything important changed to squelch debug */
 233         dev_type = phy->attached_dev_type;
 234         linkrate  = phy->linkrate;
 235         memcpy(sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 236
 237         /* Handle vacant phy - rest of dr data is not valid so skip it */
 238         if (phy->phy_state == PHY_VACANT) {
 239                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 240                 phy->attached_dev_type = SAS_PHY_UNUSED;
 241                 if (!test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) {
 242                         phy->phy_id = phy_id;
 243                         goto skip;
 244                 } else
 245                         goto out;
 246         }
 247
 248         phy->attached_dev_type = to_dev_type(dr);
 249         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 250                 goto out;
 251         phy->phy_id = phy_id;
 252         phy->linkrate = dr->linkrate;
 253         phy->attached_sata_host = dr->attached_sata_host;
 254         phy->attached_sata_dev  = dr->attached_sata_dev;
 255         phy->attached_sata_ps   = dr->attached_sata_ps;
 256         phy->attached_iproto = dr->iproto << 1;
 257         phy->attached_tproto = dr->tproto << 1;
 258         /* help some expanders that fail to zero sas_address in the 'no
 259          * device' case
 260          */
 261         if (phy->attached_dev_type == SAS_PHY_UNUSED ||
 262             phy->linkrate < SAS_LINK_RATE_1_5_GBPS)
 263                 memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 264         else
 265                 memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 266         phy->attached_phy_id = dr->attached_phy_id;
 267         phy->phy_change_count = dr->change_count;
 268         phy->routing_attr = dr->routing_attr;
 269         phy->virtual = dr->virtual;
 270         phy->last_da_index = -1;
 271
 272         phy->phy->identify.sas_address = SAS_ADDR(phy->attached_sas_addr);
 273         phy->phy->identify.device_type = dr->attached_dev_type;
 274         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 275         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 276         if (!phy->attached_tproto && dr->attached_sata_dev)
 277                 phy->phy->identify.target_port_protocols = SAS_PROTOCOL_SATA;
 278         phy->phy->identify.phy_identifier = phy_id;
 279         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 280         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 281         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 282         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 283         phy->phy->negotiated_linkrate = phy->linkrate;
 284         phy->phy->enabled = (phy->linkrate != SAS_PHY_DISABLED);
 285
 286  skip:
 287         if (new_phy)
 288                 if (sas_phy_add(phy->phy)) {
 289                         sas_phy_free(phy->phy);
 290                         return;
 291                 }
 292
 293  out:
 294         switch (phy->attached_dev_type) {
 295         case SAS_SATA_PENDING:
 296                 type = "stp pending";
 297                 break;
 298         case SAS_PHY_UNUSED:
 299                 type = "no device";
 300                 break;
 301         case SAS_END_DEVICE:
 302                 if (phy->attached_iproto) {
 303                         if (phy->attached_tproto)
 304                                 type = "host+target";
 305                         else
 306                                 type = "host";
 307                 } else {
 308                         if (dr->attached_sata_dev)
 309                                 type = "stp";
 310                         else
 311                                 type = "ssp";
 312                 }
 313                 break;
 314         case SAS_EDGE_EXPANDER_DEVICE:
 315         case SAS_FANOUT_EXPANDER_DEVICE:
 316                 type = "smp";
 317                 break;
 318         default:
 319                 type = "unknown";
 320         }
 321
 322         /* this routine is polled by libata error recovery so filter
 323          * unimportant messages
 324          */
 325         if (new_phy || phy->attached_dev_type != dev_type ||
 326             phy->linkrate != linkrate ||
 327             SAS_ADDR(phy->attached_sas_addr) != SAS_ADDR(sas_addr))
 328                 /* pass */;
 329         else
 330                 return;
 331
 332         /* if the attached device type changed and ata_eh is active,
 333          * make sure we run revalidation when eh completes (see:
 334          * sas_enable_revalidation)
 335          */
 336         if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state))
 337                 set_bit(DISCE_REVALIDATE_DOMAIN, &dev->port->disc.pending);
 338
 339         SAS_DPRINTK("%sex %016llx phy%02d:%c:%X attached: %016llx (%s)\n",
 340                     test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state) ? "ata: " : "",
 341                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 342                     sas_route_char(dev, phy), phy->linkrate,
 343                     SAS_ADDR(phy->attached_sas_addr), type);
 344 }
 345
 346 /* check if we have an existing attached ata device on this expander phy */
 347 struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id)
 348 {
 349         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy_id];
 350         struct domain_device *dev;
 351         struct sas_rphy *rphy;
 352
 353         if (!ex_phy->port)
 354                 return NULL;
 355
 356         rphy = ex_phy->port->rphy;
 357         if (!rphy)
 358                 return NULL;
 359
 360         dev = sas_find_dev_by_rphy(rphy);
 361
 362         if (dev && dev_is_sata(dev))
 363                 return dev;
 364
 365         return NULL;
 366 }
 367
 368 #define DISCOVER_REQ_SIZE  16
 369 #define DISCOVER_RESP_SIZE 56
 370
 371 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 372                                       u8 *disc_resp, int single)
 373 {
 374         struct discover_resp *dr;
 375         int res;
 376
 377         disc_req[9] = single;
 378
 379         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 380                                disc_resp, DISCOVER_RESP_SIZE);
 381         if (res)
 382                 return res;
 383         dr = &((struct smp_resp *)disc_resp)->disc;
 384         if (memcmp(dev->sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE) == 0) {
 385                 sas_printk("Found loopback topology, just ignore it!\n");
 386                 return 0;
 387         }
 388         sas_set_ex_phy(dev, single, disc_resp);
 389         return 0;
 390 }
 391
 392 int sas_ex_phy_discover(struct domain_device *dev, int single)
 393 {
 394         struct expander_device *ex = &dev->ex_dev;
 395         int  res = 0;
 396         u8   *disc_req;
 397         u8   *disc_resp;
 398
 399         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 400         if (!disc_req)
 401                 return -ENOMEM;
 402
 403         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
 404         if (!disc_resp) {
 405                 kfree(disc_req);
 406                 return -ENOMEM;
 407         }
 408
 409         disc_req[1] = SMP_DISCOVER;
 410
 411         if (0 <= single && single < ex->num_phys) {
 412                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 413         } else {
 414                 int i;
 415
 416                 for (i = 0; i < ex->num_phys; i++) {
 417                         res = sas_ex_phy_discover_helper(dev, disc_req,
 418                                                          disc_resp, i);
 419                         if (res)
 420                                 goto out_err;
 421                 }
 422         }
 423 out_err:
 424         kfree(disc_resp);
 425         kfree(disc_req);
 426         return res;
 427 }
 428
 429 static int sas_expander_discover(struct domain_device *dev)
 430 {
 431         struct expander_device *ex = &dev->ex_dev;
 432         int res = -ENOMEM;
 433
 434         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 435         if (!ex->ex_phy)
 436                 return -ENOMEM;
 437
 438         res = sas_ex_phy_discover(dev, -1);
 439         if (res)
 440                 goto out_err;
 441
 442         return 0;
 443  out_err:
 444         kfree(ex->ex_phy);
 445         ex->ex_phy = NULL;
 446         return res;
 447 }
 448
 449 #define MAX_EXPANDER_PHYS 128
 450
 451 static void ex_assign_report_general(struct domain_device *dev,
 452                                             struct smp_resp *resp)
 453 {
 454         struct report_general_resp *rg = &resp->rg;
 455
 456         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 457         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 458         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 459         dev->ex_dev.t2t_supp = rg->t2t_supp;
 460         dev->ex_dev.conf_route_table = rg->conf_route_table;
 461         dev->ex_dev.configuring = rg->configuring;
 462         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 463 }
 464
 465 #define RG_REQ_SIZE   8
 466 #define RG_RESP_SIZE 32
 467
 468 static int sas_ex_general(struct domain_device *dev)
 469 {
 470         u8 *rg_req;
 471         struct smp_resp *rg_resp;
 472         int res;
 473         int i;
 474
 475         rg_req = alloc_smp_req(RG_REQ_SIZE);
 476         if (!rg_req)
 477                 return -ENOMEM;
 478
 479         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 480         if (!rg_resp) {
 481                 kfree(rg_req);
 482                 return -ENOMEM;
 483         }
 484
 485         rg_req[1] = SMP_REPORT_GENERAL;
 486
 487         for (i = 0; i < 5; i++) {
 488                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 489                                        RG_RESP_SIZE);
 490
 491                 if (res) {
 492                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 493                                     SAS_ADDR(dev->sas_addr), res);
 494                         goto out;
 495                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 496                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 497                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 498                         res = rg_resp->result;
 499                         goto out;
 500                 }
 501
 502                 ex_assign_report_general(dev, rg_resp);
 503
 504                 if (dev->ex_dev.configuring) {
 505                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 506                                     SAS_ADDR(dev->sas_addr));
 507                         schedule_timeout_interruptible(5*HZ);
 508                 } else
 509                         break;
 510         }
 511 out:
 512         kfree(rg_req);
 513         kfree(rg_resp);
 514         return res;
 515 }
 516
 517 static void ex_assign_manuf_info(struct domain_device *dev, void
 518                                         *_mi_resp)
 519 {
 520         u8 *mi_resp = _mi_resp;
 521         struct sas_rphy *rphy = dev->rphy;
 522         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 523
 524         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 525         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 526         memcpy(edev->product_rev, mi_resp + 36,
 527                SAS_EXPANDER_PRODUCT_REV_LEN);
 528
 529         if (mi_resp[8] & 1) {
 530                 memcpy(edev->component_vendor_id, mi_resp + 40,
 531                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 532                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 533                 edev->component_revision_id = mi_resp[50];
 534         }
 535 }
 536
 537 #define MI_REQ_SIZE   8
 538 #define MI_RESP_SIZE 64
 539
 540 static int sas_ex_manuf_info(struct domain_device *dev)
 541 {
 542         u8 *mi_req;
 543         u8 *mi_resp;
 544         int res;
 545
 546         mi_req = alloc_smp_req(MI_REQ_SIZE);
 547         if (!mi_req)
 548                 return -ENOMEM;
 549
 550         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 551         if (!mi_resp) {
 552                 kfree(mi_req);
 553                 return -ENOMEM;
 554         }
 555
 556         mi_req[1] = SMP_REPORT_MANUF_INFO;
 557
 558         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 559         if (res) {
 560                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 561                             SAS_ADDR(dev->sas_addr), res);
 562                 goto out;
 563         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 564                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 565                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 566                 goto out;
 567         }
 568
 569         ex_assign_manuf_info(dev, mi_resp);
 570 out:
 571         kfree(mi_req);
 572         kfree(mi_resp);
 573         return res;
 574 }
 575
 576 #define PC_REQ_SIZE  44
 577 #define PC_RESP_SIZE 8
 578
 579 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 580                         enum phy_func phy_func,
 581                         struct sas_phy_linkrates *rates)
 582 {
 583         u8 *pc_req;
 584         u8 *pc_resp;
 585         int res;
 586
 587         pc_req = alloc_smp_req(PC_REQ_SIZE);
 588         if (!pc_req)
 589                 return -ENOMEM;
 590
 591         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 592         if (!pc_resp) {
 593                 kfree(pc_req);
 594                 return -ENOMEM;
 595         }
 596
 597         pc_req[1] = SMP_PHY_CONTROL;
 598         pc_req[9] = phy_id;
 599         pc_req[10]= phy_func;
 600         if (rates) {
 601                 pc_req[32] = rates->minimum_linkrate << 4;
 602                 pc_req[33] = rates->maximum_linkrate << 4;
 603         }
 604
 605         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 606         if (res) {
 607                 pr_err("ex %016llx phy%02d PHY control failed: %d\n",
 608                        SAS_ADDR(dev->sas_addr), phy_id, res);
 609         } else if (pc_resp[2] != SMP_RESP_FUNC_ACC) {
 610                 pr_err("ex %016llx phy%02d PHY control failed: function result 0x%x\n",
 611                        SAS_ADDR(dev->sas_addr), phy_id, pc_resp[2]);
 612                 res = pc_resp[2];
 613         }
 614         kfree(pc_resp);
 615         kfree(pc_req);
 616         return res;
 617 }
 618
 619 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 620 {
 621         struct expander_device *ex = &dev->ex_dev;
 622         struct ex_phy *phy = &ex->ex_phy[phy_id];
 623
 624         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 625         phy->linkrate = SAS_PHY_DISABLED;
 626 }
 627
 628 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 629 {
 630         struct expander_device *ex = &dev->ex_dev;
 631         int i;
 632
 633         for (i = 0; i < ex->num_phys; i++) {
 634                 struct ex_phy *phy = &ex->ex_phy[i];
 635
 636                 if (phy->phy_state == PHY_VACANT ||
 637                     phy->phy_state == PHY_NOT_PRESENT)
 638                         continue;
 639
 640                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 641                         sas_ex_disable_phy(dev, i);
 642         }
 643 }
 644
 645 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 646                                             u8 *sas_addr)
 647 {
 648         struct domain_device *dev;
 649
 650         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 651                 return 1;
 652         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 653                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 654                         return 1;
 655         }
 656         return 0;
 657 }
 658
 659 #define RPEL_REQ_SIZE   16
 660 #define RPEL_RESP_SIZE  32
 661 int sas_smp_get_phy_events(struct sas_phy *phy)
 662 {
 663         int res;
 664         u8 *req;
 665         u8 *resp;
 666         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 667         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 668
 669         req = alloc_smp_req(RPEL_REQ_SIZE);
 670         if (!req)
 671                 return -ENOMEM;
 672
 673         resp = alloc_smp_resp(RPEL_RESP_SIZE);
 674         if (!resp) {
 675                 kfree(req);
 676                 return -ENOMEM;
 677         }
 678
 679         req[1] = SMP_REPORT_PHY_ERR_LOG;
 680         req[9] = phy->number;
 681
 682         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 683                                     resp, RPEL_RESP_SIZE);
 684
 685         if (res)
 686                 goto out;
 687
 688         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 689         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 690         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 691         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 692
 693  out:
 694         kfree(req);
 695         kfree(resp);
 696         return res;
 697
 698 }
 699
 700 #ifdef CONFIG_SCSI_SAS_ATA
 701
 702 #define RPS_REQ_SIZE  16
 703 #define RPS_RESP_SIZE 60
 704
 705 int sas_get_report_phy_sata(struct domain_device *dev, int phy_id,
 706                             struct smp_resp *rps_resp)
 707 {
 708         int res;
 709         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 710         u8 *resp = (u8 *)rps_resp;
 711
 712         if (!rps_req)
 713                 return -ENOMEM;
 714
 715         rps_req[1] = SMP_REPORT_PHY_SATA;
 716         rps_req[9] = phy_id;
 717
 718         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 719                                     rps_resp, RPS_RESP_SIZE);
 720
 721         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 722          * standards cockup here.  sas-2 explicitly specifies the FIS
 723          * should be encoded so that FIS type is in resp[24].
 724          * However, some expanders endian reverse this.  Undo the
 725          * reversal here */
 726         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 727                 int i;
 728
 729                 for (i = 0; i < 5; i++) {
 730                         int j = 24 + (i*4);
 731                         u8 a, b;
 732                         a = resp[j + 0];
 733                         b = resp[j + 1];
 734                         resp[j + 0] = resp[j + 3];
 735                         resp[j + 1] = resp[j + 2];
 736                         resp[j + 2] = b;
 737                         resp[j + 3] = a;
 738                 }
 739         }
 740
 741         kfree(rps_req);
 742         return res;
 743 }
 744 #endif
 745
 746 static void sas_ex_get_linkrate(struct domain_device *parent,
 747                                        struct domain_device *child,
 748                                        struct ex_phy *parent_phy)
 749 {
 750         struct expander_device *parent_ex = &parent->ex_dev;
 751         struct sas_port *port;
 752         int i;
 753
 754         child->pathways = 0;
 755
 756         port = parent_phy->port;
 757
 758         for (i = 0; i < parent_ex->num_phys; i++) {
 759                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 760
 761                 if (phy->phy_state == PHY_VACANT ||
 762                     phy->phy_state == PHY_NOT_PRESENT)
 763                         continue;
 764
 765                 if (SAS_ADDR(phy->attached_sas_addr) ==
 766                     SAS_ADDR(child->sas_addr)) {
 767
 768                         child->min_linkrate = min(parent->min_linkrate,
 769                                                   phy->linkrate);
 770                         child->max_linkrate = max(parent->max_linkrate,
 771                                                   phy->linkrate);
 772                         child->pathways++;
 773                         sas_port_add_phy(port, phy->phy);
 774                 }
 775         }
 776         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 777         child->pathways = min(child->pathways, parent->pathways);
 778 }
 779
 780 static struct domain_device *sas_ex_discover_end_dev(
 781         struct domain_device *parent, int phy_id)
 782 {
 783         struct expander_device *parent_ex = &parent->ex_dev;
 784         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 785         struct domain_device *child = NULL;
 786         struct sas_rphy *rphy;
 787         int res;
 788
 789         if (phy->attached_sata_host || phy->attached_sata_ps)
 790                 return NULL;
 791
 792         child = sas_alloc_device();
 793         if (!child)
 794                 return NULL;
 795
 796         kref_get(&parent->kref);
 797         child->parent = parent;
 798         child->port   = parent->port;
 799         child->iproto = phy->attached_iproto;
 800         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 801         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 802         if (!phy->port) {
 803                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 804                 if (unlikely(!phy->port))
 805                         goto out_err;
 806                 if (unlikely(sas_port_add(phy->port) != 0)) {
 807                         sas_port_free(phy->port);
 808                         goto out_err;
 809                 }
 810         }
 811         sas_ex_get_linkrate(parent, child, phy);
 812         sas_device_set_phy(child, phy->port);
 813
 814 #ifdef CONFIG_SCSI_SAS_ATA
 815         if ((phy->attached_tproto & SAS_PROTOCOL_STP) || phy->attached_sata_dev) {
 816                 if (child->linkrate > parent->min_linkrate) {
 817                         struct sas_phy_linkrates rates = {
 818                                 .maximum_linkrate = parent->min_linkrate,
 819                                 .minimum_linkrate = parent->min_linkrate,
 820                         };
 821                         int ret;
 822
 823                         pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
 824                                    SAS_ADDR(child->sas_addr), phy_id);
 825                         ret = sas_smp_phy_control(parent, phy_id,
 826                                                   PHY_FUNC_LINK_RESET, &rates);
 827                         if (ret) {
 828                                 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
 829                                        SAS_ADDR(child->sas_addr), phy_id, ret);
 830                                 goto out_free;
 831                         }
 832                         pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
 833                                   SAS_ADDR(child->sas_addr), phy_id);
 834                         child->linkrate = child->min_linkrate;
 835                 }
 836                 res = sas_get_ata_info(child, phy);
 837                 if (res)
 838                         goto out_free;
 839
 840                 sas_init_dev(child);
 841                 res = sas_ata_init(child);
 842                 if (res)
 843                         goto out_free;
 844                 rphy = sas_end_device_alloc(phy->port);
 845                 if (!rphy)
 846                         goto out_free;
 847                 rphy->identify.phy_identifier = phy_id;
 848
 849                 child->rphy = rphy;
 850                 get_device(&rphy->dev);
 851
 852                 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 853
 854                 res = sas_discover_sata(child);
 855                 if (res) {
 856                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 857                                     "%016llx:0x%x returned 0x%x\n",
 858                                     SAS_ADDR(child->sas_addr),
 859                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 860                         goto out_list_del;
 861                 }
 862         } else
 863 #endif
 864           if (phy->attached_tproto & SAS_PROTOCOL_SSP) {
 865                 child->dev_type = SAS_END_DEVICE;
 866                 rphy = sas_end_device_alloc(phy->port);
 867                 /* FIXME: error handling */
 868                 if (unlikely(!rphy))
 869                         goto out_free;
 870                 child->tproto = phy->attached_tproto;
 871                 sas_init_dev(child);
 872
 873                 child->rphy = rphy;
 874                 get_device(&rphy->dev);
 875                 rphy->identify.phy_identifier = phy_id;
 876                 sas_fill_in_rphy(child, rphy);
 877
 878                 list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 879
 880                 res = sas_discover_end_dev(child);
 881                 if (res) {
 882                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 883                                     "at %016llx:0x%x returned 0x%x\n",
 884                                     SAS_ADDR(child->sas_addr),
 885                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 886                         goto out_list_del;
 887                 }
 888         } else {
 889                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 890                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 891                             phy_id);
 892                 goto out_free;
 893         }
 894
 895         list_add_tail(&child->siblings, &parent_ex->children);
 896         return child;
 897
 898  out_list_del:
 899         sas_rphy_free(child->rphy);
 900         list_del(&child->disco_list_node);
 901         spin_lock_irq(&parent->port->dev_list_lock);
 902         list_del(&child->dev_list_node);
 903         spin_unlock_irq(&parent->port->dev_list_lock);
 904  out_free:
 905         sas_port_delete(phy->port);
 906  out_err:
 907         phy->port = NULL;
 908         sas_put_device(child);
 909         return NULL;
 910 }
 911
 912 /* See if this phy is part of a wide port */
 913 static bool sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 914 {
 915         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 916         int i;
 917
 918         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 919                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 920
 921                 if (ephy == phy)
 922                         continue;
 923
 924                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 925                             SAS_ADDR_SIZE) && ephy->port) {
 926                         sas_port_add_phy(ephy->port, phy->phy);
 927                         phy->port = ephy->port;
 928                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 929                         return true;
 930                 }
 931         }
 932
 933         return false;
 934 }
 935
 936 static struct domain_device *sas_ex_discover_expander(
 937         struct domain_device *parent, int phy_id)
 938 {
 939         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 940         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 941         struct domain_device *child = NULL;
 942         struct sas_rphy *rphy;
 943         struct sas_expander_device *edev;
 944         struct asd_sas_port *port;
 945         int res;
 946
 947         if (phy->routing_attr == DIRECT_ROUTING) {
 948                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 949                             "allowed\n",
 950                             SAS_ADDR(parent->sas_addr), phy_id,
 951                             SAS_ADDR(phy->attached_sas_addr),
 952                             phy->attached_phy_id);
 953                 return NULL;
 954         }
 955         child = sas_alloc_device();
 956         if (!child)
 957                 return NULL;
 958
 959         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 960         /* FIXME: better error handling */
 961         BUG_ON(sas_port_add(phy->port) != 0);
 962
 963
 964         switch (phy->attached_dev_type) {
 965         case SAS_EDGE_EXPANDER_DEVICE:
 966                 rphy = sas_expander_alloc(phy->port,
 967                                           SAS_EDGE_EXPANDER_DEVICE);
 968                 break;
 969         case SAS_FANOUT_EXPANDER_DEVICE:
 970                 rphy = sas_expander_alloc(phy->port,
 971                                           SAS_FANOUT_EXPANDER_DEVICE);
 972                 break;
 973         default:
 974                 rphy = NULL;    /* shut gcc up */
 975                 BUG();
 976         }
 977         port = parent->port;
 978         child->rphy = rphy;
 979         get_device(&rphy->dev);
 980         edev = rphy_to_expander_device(rphy);
 981         child->dev_type = phy->attached_dev_type;
 982         kref_get(&parent->kref);
 983         child->parent = parent;
 984         child->port = port;
 985         child->iproto = phy->attached_iproto;
 986         child->tproto = phy->attached_tproto;
 987         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 988         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 989         sas_ex_get_linkrate(parent, child, phy);
 990         edev->level = parent_ex->level + 1;
 991         parent->port->disc.max_level = max(parent->port->disc.max_level,
 992                                            edev->level);
 993         sas_init_dev(child);
 994         sas_fill_in_rphy(child, rphy);
 995         sas_rphy_add(rphy);
 996
 997         spin_lock_irq(&parent->port->dev_list_lock);
 998         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 999         spin_unlock_irq(&parent->port->dev_list_lock);
1000
1001         res = sas_discover_expander(child);
1002         if (res) {
1003                 sas_rphy_delete(rphy);
1004                 spin_lock_irq(&parent->port->dev_list_lock);
1005                 list_del(&child->dev_list_node);
1006                 spin_unlock_irq(&parent->port->dev_list_lock);
1007                 sas_put_device(child);
1008                 sas_port_delete(phy->port);
1009                 phy->port = NULL;
1010                 return NULL;
1011         }
1012         list_add_tail(&child->siblings, &parent->ex_dev.children);
1013         return child;
1014 }
1015
1016 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
1017 {
1018         struct expander_device *ex = &dev->ex_dev;
1019         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
1020         struct domain_device *child = NULL;
1021         int res = 0;
1022
1023         /* Phy state */
1024         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
1025                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
1026                         res = sas_ex_phy_discover(dev, phy_id);
1027                 if (res)
1028                         return res;
1029         }
1030
1031         /* Parent and domain coherency */
1032         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
1033                              SAS_ADDR(dev->port->sas_addr))) {
1034                 sas_add_parent_port(dev, phy_id);
1035                 return 0;
1036         }
1037         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
1038                             SAS_ADDR(dev->parent->sas_addr))) {
1039                 sas_add_parent_port(dev, phy_id);
1040                 if (ex_phy->routing_attr == TABLE_ROUTING)
1041                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
1042                 return 0;
1043         }
1044
1045         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
1046                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
1047
1048         if (ex_phy->attached_dev_type == SAS_PHY_UNUSED) {
1049                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
1050                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1051                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
1052                 }
1053                 return 0;
1054         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
1055                 return 0;
1056
1057         if (ex_phy->attached_dev_type != SAS_END_DEVICE &&
1058             ex_phy->attached_dev_type != SAS_FANOUT_EXPANDER_DEVICE &&
1059             ex_phy->attached_dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1060             ex_phy->attached_dev_type != SAS_SATA_PENDING) {
1061                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
1062                             "phy 0x%x\n", ex_phy->attached_dev_type,
1063                             SAS_ADDR(dev->sas_addr),
1064                             phy_id);
1065                 return 0;
1066         }
1067
1068         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
1069         if (res) {
1070                 SAS_DPRINTK("configure routing for dev %016llx "
1071                             "reported 0x%x. Forgotten\n",
1072                             SAS_ADDR(ex_phy->attached_sas_addr), res);
1073                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
1074                 return res;
1075         }
1076
1077         if (sas_ex_join_wide_port(dev, phy_id)) {
1078                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
1079                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
1080                 return res;
1081         }
1082
1083         switch (ex_phy->attached_dev_type) {
1084         case SAS_END_DEVICE:
1085         case SAS_SATA_PENDING:
1086                 child = sas_ex_discover_end_dev(dev, phy_id);
1087                 break;
1088         case SAS_FANOUT_EXPANDER_DEVICE:
1089                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
1090                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
1091                                     "attached to ex %016llx phy 0x%x\n",
1092                                     SAS_ADDR(ex_phy->attached_sas_addr),
1093                                     ex_phy->attached_phy_id,
1094                                     SAS_ADDR(dev->sas_addr),
1095                                     phy_id);
1096                         sas_ex_disable_phy(dev, phy_id);
1097                         break;
1098                 } else
1099                         memcpy(dev->port->disc.fanout_sas_addr,
1100                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
1101                 /* fallthrough */
1102         case SAS_EDGE_EXPANDER_DEVICE:
1103                 child = sas_ex_discover_expander(dev, phy_id);
1104                 break;
1105         default:
1106                 break;
1107         }
1108
1109         if (child) {
1110                 int i;
1111
1112                 for (i = 0; i < ex->num_phys; i++) {
1113                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
1114                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
1115                                 continue;
1116                         /*
1117                          * Due to races, the phy might not get added to the
1118                          * wide port, so we add the phy to the wide port here.
1119                          */
1120                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
1121                             SAS_ADDR(child->sas_addr)) {
1122                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
1123                                 if (sas_ex_join_wide_port(dev, i))
1124                                         SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
1125                                                     i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr));
1126
1127                         }
1128                 }
1129         }
1130
1131         return res;
1132 }
1133
1134 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
1135 {
1136         struct expander_device *ex = &dev->ex_dev;
1137         int i;
1138
1139         for (i = 0; i < ex->num_phys; i++) {
1140                 struct ex_phy *phy = &ex->ex_phy[i];
1141
1142                 if (phy->phy_state == PHY_VACANT ||
1143                     phy->phy_state == PHY_NOT_PRESENT)
1144                         continue;
1145
1146                 if ((phy->attached_dev_type == SAS_EDGE_EXPANDER_DEVICE ||
1147                      phy->attached_dev_type == SAS_FANOUT_EXPANDER_DEVICE) &&
1148                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1149
1150                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
1151
1152                         return 1;
1153                 }
1154         }
1155         return 0;
1156 }
1157
1158 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
1159 {
1160         struct expander_device *ex = &dev->ex_dev;
1161         struct domain_device *child;
1162         u8 sub_addr[8] = {0, };
1163
1164         list_for_each_entry(child, &ex->children, siblings) {
1165                 if (child->dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1166                     child->dev_type != SAS_FANOUT_EXPANDER_DEVICE)
1167                         continue;
1168                 if (sub_addr[0] == 0) {
1169                         sas_find_sub_addr(child, sub_addr);
1170                         continue;
1171                 } else {
1172                         u8 s2[8];
1173
1174                         if (sas_find_sub_addr(child, s2) &&
1175                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
1176
1177                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
1178                                             "diverges from subtractive "
1179                                             "boundary %016llx\n",
1180                                             SAS_ADDR(dev->sas_addr),
1181                                             SAS_ADDR(child->sas_addr),
1182                                             SAS_ADDR(s2),
1183                                             SAS_ADDR(sub_addr));
1184
1185                                 sas_ex_disable_port(child, s2);
1186                         }
1187                 }
1188         }
1189         return 0;
1190 }
1191 /**
1192  * sas_ex_discover_devices -- discover devices attached to this expander
1193  * dev: pointer to the expander domain device
1194  * single: if you want to do a single phy, else set to -1;
1195  *
1196  * Configure this expander for use with its devices and register the
1197  * devices of this expander.
1198  */
1199 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1200 {
1201         struct expander_device *ex = &dev->ex_dev;
1202         int i = 0, end = ex->num_phys;
1203         int res = 0;
1204
1205         if (0 <= single && single < end) {
1206                 i = single;
1207                 end = i+1;
1208         }
1209
1210         for ( ; i < end; i++) {
1211                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1212
1213                 if (ex_phy->phy_state == PHY_VACANT ||
1214                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1215                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1216                         continue;
1217
1218                 switch (ex_phy->linkrate) {
1219                 case SAS_PHY_DISABLED:
1220                 case SAS_PHY_RESET_PROBLEM:
1221                 case SAS_SATA_PORT_SELECTOR:
1222                         continue;
1223                 default:
1224                         res = sas_ex_discover_dev(dev, i);
1225                         if (res)
1226                                 break;
1227                         continue;
1228                 }
1229         }
1230
1231         if (!res)
1232                 sas_check_level_subtractive_boundary(dev);
1233
1234         return res;
1235 }
1236
1237 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1238 {
1239         struct expander_device *ex = &dev->ex_dev;
1240         int i;
1241         u8  *sub_sas_addr = NULL;
1242
1243         if (dev->dev_type != SAS_EDGE_EXPANDER_DEVICE)
1244                 return 0;
1245
1246         for (i = 0; i < ex->num_phys; i++) {
1247                 struct ex_phy *phy = &ex->ex_phy[i];
1248
1249                 if (phy->phy_state == PHY_VACANT ||
1250                     phy->phy_state == PHY_NOT_PRESENT)
1251                         continue;
1252
1253                 if ((phy->attached_dev_type == SAS_FANOUT_EXPANDER_DEVICE ||
1254                      phy->attached_dev_type == SAS_EDGE_EXPANDER_DEVICE) &&
1255                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1256
1257                         if (!sub_sas_addr)
1258                                 sub_sas_addr = &phy->attached_sas_addr[0];
1259                         else if (SAS_ADDR(sub_sas_addr) !=
1260                                  SAS_ADDR(phy->attached_sas_addr)) {
1261
1262                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1263                                             "diverges(%016llx) on subtractive "
1264                                             "boundary(%016llx). Disabled\n",
1265                                             SAS_ADDR(dev->sas_addr), i,
1266                                             SAS_ADDR(phy->attached_sas_addr),
1267                                             SAS_ADDR(sub_sas_addr));
1268                                 sas_ex_disable_phy(dev, i);
1269                         }
1270                 }
1271         }
1272         return 0;
1273 }
1274
1275 static void sas_print_parent_topology_bug(struct domain_device *child,
1276                                                  struct ex_phy *parent_phy,
1277                                                  struct ex_phy *child_phy)
1278 {
1279         static const char *ex_type[] = {
1280                 [SAS_EDGE_EXPANDER_DEVICE] = "edge",
1281                 [SAS_FANOUT_EXPANDER_DEVICE] = "fanout",
1282         };
1283         struct domain_device *parent = child->parent;
1284
1285         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx "
1286                    "phy 0x%x has %c:%c routing link!\n",
1287
1288                    ex_type[parent->dev_type],
1289                    SAS_ADDR(parent->sas_addr),
1290                    parent_phy->phy_id,
1291
1292                    ex_type[child->dev_type],
1293                    SAS_ADDR(child->sas_addr),
1294                    child_phy->phy_id,
1295
1296                    sas_route_char(parent, parent_phy),
1297                    sas_route_char(child, child_phy));
1298 }
1299
1300 static int sas_check_eeds(struct domain_device *child,
1301                                  struct ex_phy *parent_phy,
1302                                  struct ex_phy *child_phy)
1303 {
1304         int res = 0;
1305         struct domain_device *parent = child->parent;
1306
1307         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1308                 res = -ENODEV;
1309                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1310                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1311                             SAS_ADDR(parent->sas_addr),
1312                             parent_phy->phy_id,
1313                             SAS_ADDR(child->sas_addr),
1314                             child_phy->phy_id,
1315                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1316         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1317                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1318                        SAS_ADDR_SIZE);
1319                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1320                        SAS_ADDR_SIZE);
1321         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1322                     SAS_ADDR(parent->sas_addr)) ||
1323                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1324                     SAS_ADDR(child->sas_addr)))
1325                    &&
1326                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1327                      SAS_ADDR(parent->sas_addr)) ||
1328                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1329                      SAS_ADDR(child->sas_addr))))
1330                 ;
1331         else {
1332                 res = -ENODEV;
1333                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1334                             "phy 0x%x link forms a third EEDS!\n",
1335                             SAS_ADDR(parent->sas_addr),
1336                             parent_phy->phy_id,
1337                             SAS_ADDR(child->sas_addr),
1338                             child_phy->phy_id);
1339         }
1340
1341         return res;
1342 }
1343
1344 /* Here we spill over 80 columns.  It is intentional.
1345  */
1346 static int sas_check_parent_topology(struct domain_device *child)
1347 {
1348         struct expander_device *child_ex = &child->ex_dev;
1349         struct expander_device *parent_ex;
1350         int i;
1351         int res = 0;
1352
1353         if (!child->parent)
1354                 return 0;
1355
1356         if (child->parent->dev_type != SAS_EDGE_EXPANDER_DEVICE &&
1357             child->parent->dev_type != SAS_FANOUT_EXPANDER_DEVICE)
1358                 return 0;
1359
1360         parent_ex = &child->parent->ex_dev;
1361
1362         for (i = 0; i < parent_ex->num_phys; i++) {
1363                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1364                 struct ex_phy *child_phy;
1365
1366                 if (parent_phy->phy_state == PHY_VACANT ||
1367                     parent_phy->phy_state == PHY_NOT_PRESENT)
1368                         continue;
1369
1370                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1371                         continue;
1372
1373                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1374
1375                 switch (child->parent->dev_type) {
1376                 case SAS_EDGE_EXPANDER_DEVICE:
1377                         if (child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1378                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1379                                     child_phy->routing_attr != TABLE_ROUTING) {
1380                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1381                                         res = -ENODEV;
1382                                 }
1383                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1384                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1385                                         res = sas_check_eeds(child, parent_phy, child_phy);
1386                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1387                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1388                                         res = -ENODEV;
1389                                 }
1390                         } else if (parent_phy->routing_attr == TABLE_ROUTING) {
1391                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING ||
1392                                     (child_phy->routing_attr == TABLE_ROUTING &&
1393                                      child_ex->t2t_supp && parent_ex->t2t_supp)) {
1394                                         /* All good */;
1395                                 } else {
1396                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1397                                         res = -ENODEV;
1398                                 }
1399                         }
1400                         break;
1401                 case SAS_FANOUT_EXPANDER_DEVICE:
1402                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1403                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1404                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1405                                 res = -ENODEV;
1406                         }
1407                         break;
1408                 default:
1409                         break;
1410                 }
1411         }
1412
1413         return res;
1414 }
1415
1416 #define RRI_REQ_SIZE  16
1417 #define RRI_RESP_SIZE 44
1418
1419 static int sas_configure_present(struct domain_device *dev, int phy_id,
1420                                  u8 *sas_addr, int *index, int *present)
1421 {
1422         int i, res = 0;
1423         struct expander_device *ex = &dev->ex_dev;
1424         struct ex_phy *phy = &ex->ex_phy[phy_id];
1425         u8 *rri_req;
1426         u8 *rri_resp;
1427
1428         *present = 0;
1429         *index = 0;
1430
1431         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1432         if (!rri_req)
1433                 return -ENOMEM;
1434
1435         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1436         if (!rri_resp) {
1437                 kfree(rri_req);
1438                 return -ENOMEM;
1439         }
1440
1441         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1442         rri_req[9] = phy_id;
1443
1444         for (i = 0; i < ex->max_route_indexes ; i++) {
1445                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1446                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1447                                        RRI_RESP_SIZE);
1448                 if (res)
1449                         goto out;
1450                 res = rri_resp[2];
1451                 if (res == SMP_RESP_NO_INDEX) {
1452                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1453                                     "phy 0x%x index 0x%x\n",
1454                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1455                         goto out;
1456                 } else if (res != SMP_RESP_FUNC_ACC) {
1457                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1458                                     "result 0x%x\n", __func__,
1459                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1460                         goto out;
1461                 }
1462                 if (SAS_ADDR(sas_addr) != 0) {
1463                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1464                                 *index = i;
1465                                 if ((rri_resp[12] & 0x80) == 0x80)
1466                                         *present = 0;
1467                                 else
1468                                         *present = 1;
1469                                 goto out;
1470                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1471                                 *index = i;
1472                                 *present = 0;
1473                                 goto out;
1474                         }
1475                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1476                            phy->last_da_index < i) {
1477                         phy->last_da_index = i;
1478                         *index = i;
1479                         *present = 0;
1480                         goto out;
1481                 }
1482         }
1483         res = -1;
1484 out:
1485         kfree(rri_req);
1486         kfree(rri_resp);
1487         return res;
1488 }
1489
1490 #define CRI_REQ_SIZE  44
1491 #define CRI_RESP_SIZE  8
1492
1493 static int sas_configure_set(struct domain_device *dev, int phy_id,
1494                              u8 *sas_addr, int index, int include)
1495 {
1496         int res;
1497         u8 *cri_req;
1498         u8 *cri_resp;
1499
1500         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1501         if (!cri_req)
1502                 return -ENOMEM;
1503
1504         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1505         if (!cri_resp) {
1506                 kfree(cri_req);
1507                 return -ENOMEM;
1508         }
1509
1510         cri_req[1] = SMP_CONF_ROUTE_INFO;
1511         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1512         cri_req[9] = phy_id;
1513         if (SAS_ADDR(sas_addr) == 0 || !include)
1514                 cri_req[12] |= 0x80;
1515         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1516
1517         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1518                                CRI_RESP_SIZE);
1519         if (res)
1520                 goto out;
1521         res = cri_resp[2];
1522         if (res == SMP_RESP_NO_INDEX) {
1523                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1524                             "index 0x%x\n",
1525                             SAS_ADDR(dev->sas_addr), phy_id, index);
1526         }
1527 out:
1528         kfree(cri_req);
1529         kfree(cri_resp);
1530         return res;
1531 }
1532
1533 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1534                                     u8 *sas_addr, int include)
1535 {
1536         int index;
1537         int present;
1538         int res;
1539
1540         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1541         if (res)
1542                 return res;
1543         if (include ^ present)
1544                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1545
1546         return res;
1547 }
1548
1549 /**
1550  * sas_configure_parent -- configure routing table of parent
1551  * parent: parent expander
1552  * child: child expander
1553  * sas_addr: SAS port identifier of device directly attached to child
1554  */
1555 static int sas_configure_parent(struct domain_device *parent,
1556                                 struct domain_device *child,
1557                                 u8 *sas_addr, int include)
1558 {
1559         struct expander_device *ex_parent = &parent->ex_dev;
1560         int res = 0;
1561         int i;
1562
1563         if (parent->parent) {
1564                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1565                                            include);
1566                 if (res)
1567                         return res;
1568         }
1569
1570         if (ex_parent->conf_route_table == 0) {
1571                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1572                             SAS_ADDR(parent->sas_addr));
1573                 return 0;
1574         }
1575
1576         for (i = 0; i < ex_parent->num_phys; i++) {
1577                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1578
1579                 if ((phy->routing_attr == TABLE_ROUTING) &&
1580                     (SAS_ADDR(phy->attached_sas_addr) ==
1581                      SAS_ADDR(child->sas_addr))) {
1582                         res = sas_configure_phy(parent, i, sas_addr, include);
1583                         if (res)
1584                                 return res;
1585                 }
1586         }
1587
1588         return res;
1589 }
1590
1591 /**
1592  * sas_configure_routing -- configure routing
1593  * dev: expander device
1594  * sas_addr: port identifier of device directly attached to the expander device
1595  */
1596 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1597 {
1598         if (dev->parent)
1599                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1600         return 0;
1601 }
1602
1603 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1604 {
1605         if (dev->parent)
1606                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1607         return 0;
1608 }
1609
1610 /**
1611  * sas_discover_expander -- expander discovery
1612  * @ex: pointer to expander domain device
1613  *
1614  * See comment in sas_discover_sata().
1615  */
1616 static int sas_discover_expander(struct domain_device *dev)
1617 {
1618         int res;
1619
1620         res = sas_notify_lldd_dev_found(dev);
1621         if (res)
1622                 return res;
1623
1624         res = sas_ex_general(dev);
1625         if (res)
1626                 goto out_err;
1627         res = sas_ex_manuf_info(dev);
1628         if (res)
1629                 goto out_err;
1630
1631         res = sas_expander_discover(dev);
1632         if (res) {
1633                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1634                             SAS_ADDR(dev->sas_addr), res);
1635                 goto out_err;
1636         }
1637
1638         sas_check_ex_subtractive_boundary(dev);
1639         res = sas_check_parent_topology(dev);
1640         if (res)
1641                 goto out_err;
1642         return 0;
1643 out_err:
1644         sas_notify_lldd_dev_gone(dev);
1645         return res;
1646 }
1647
1648 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1649 {
1650         int res = 0;
1651         struct domain_device *dev;
1652
1653         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1654                 if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
1655                     dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1656                         struct sas_expander_device *ex =
1657                                 rphy_to_expander_device(dev->rphy);
1658
1659                         if (level == ex->level)
1660                                 res = sas_ex_discover_devices(dev, -1);
1661                         else if (level > 0)
1662                                 res = sas_ex_discover_devices(port->port_dev, -1);
1663
1664                 }
1665         }
1666
1667         return res;
1668 }
1669
1670 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1671 {
1672         int res;
1673         int level;
1674
1675         do {
1676                 level = port->disc.max_level;
1677                 res = sas_ex_level_discovery(port, level);
1678                 mb();
1679         } while (level < port->disc.max_level);
1680
1681         return res;
1682 }
1683
1684 int sas_discover_root_expander(struct domain_device *dev)
1685 {
1686         int res;
1687         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1688
1689         res = sas_rphy_add(dev->rphy);
1690         if (res)
1691                 goto out_err;
1692
1693         ex->level = dev->port->disc.max_level; /* 0 */
1694         res = sas_discover_expander(dev);
1695         if (res)
1696                 goto out_err2;
1697
1698         sas_ex_bfs_disc(dev->port);
1699
1700         return res;
1701
1702 out_err2:
1703         sas_rphy_remove(dev->rphy);
1704 out_err:
1705         return res;
1706 }
1707
1708 /* ---------- Domain revalidation ---------- */
1709
1710 static int sas_get_phy_discover(struct domain_device *dev,
1711                                 int phy_id, struct smp_resp *disc_resp)
1712 {
1713         int res;
1714         u8 *disc_req;
1715
1716         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1717         if (!disc_req)
1718                 return -ENOMEM;
1719
1720         disc_req[1] = SMP_DISCOVER;
1721         disc_req[9] = phy_id;
1722
1723         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1724                                disc_resp, DISCOVER_RESP_SIZE);
1725         if (res)
1726                 goto out;
1727         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1728                 res = disc_resp->result;
1729                 goto out;
1730         }
1731 out:
1732         kfree(disc_req);
1733         return res;
1734 }
1735
1736 static int sas_get_phy_change_count(struct domain_device *dev,
1737                                     int phy_id, int *pcc)
1738 {
1739         int res;
1740         struct smp_resp *disc_resp;
1741
1742         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1743         if (!disc_resp)
1744                 return -ENOMEM;
1745
1746         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1747         if (!res)
1748                 *pcc = disc_resp->disc.change_count;
1749
1750         kfree(disc_resp);
1751         return res;
1752 }
1753
1754 static int sas_get_phy_attached_dev(struct domain_device *dev, int phy_id,
1755                                     u8 *sas_addr, enum sas_device_type *type)
1756 {
1757         int res;
1758         struct smp_resp *disc_resp;
1759         struct discover_resp *dr;
1760
1761         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1762         if (!disc_resp)
1763                 return -ENOMEM;
1764         dr = &disc_resp->disc;
1765
1766         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1767         if (res == 0) {
1768                 memcpy(sas_addr, disc_resp->disc.attached_sas_addr, 8);
1769                 *type = to_dev_type(dr);
1770                 if (*type == 0)
1771                         memset(sas_addr, 0, 8);
1772         }
1773         kfree(disc_resp);
1774         return res;
1775 }
1776
1777 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1778                               int from_phy, bool update)
1779 {
1780         struct expander_device *ex = &dev->ex_dev;
1781         int res = 0;
1782         int i;
1783
1784         for (i = from_phy; i < ex->num_phys; i++) {
1785                 int phy_change_count = 0;
1786
1787                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1788                 switch (res) {
1789                 case SMP_RESP_PHY_VACANT:
1790                 case SMP_RESP_NO_PHY:
1791                         continue;
1792                 case SMP_RESP_FUNC_ACC:
1793                         break;
1794                 default:
1795                         return res;
1796                 }
1797
1798                 if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1799                         if (update)
1800                                 ex->ex_phy[i].phy_change_count =
1801                                         phy_change_count;
1802                         *phy_id = i;
1803                         return 0;
1804                 }
1805         }
1806         return 0;
1807 }
1808
1809 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1810 {
1811         int res;
1812         u8  *rg_req;
1813         struct smp_resp  *rg_resp;
1814
1815         rg_req = alloc_smp_req(RG_REQ_SIZE);
1816         if (!rg_req)
1817                 return -ENOMEM;
1818
1819         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1820         if (!rg_resp) {
1821                 kfree(rg_req);
1822                 return -ENOMEM;
1823         }
1824
1825         rg_req[1] = SMP_REPORT_GENERAL;
1826
1827         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1828                                RG_RESP_SIZE);
1829         if (res)
1830                 goto out;
1831         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1832                 res = rg_resp->result;
1833                 goto out;
1834         }
1835
1836         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1837 out:
1838         kfree(rg_resp);
1839         kfree(rg_req);
1840         return res;
1841 }
1842 /**
1843  * sas_find_bcast_dev -  find the device issue BROADCAST(CHANGE).
1844  * @dev:domain device to be detect.
1845  * @src_dev: the device which originated BROADCAST(CHANGE).
1846  *
1847  * Add self-configuration expander support. Suppose two expander cascading,
1848  * when the first level expander is self-configuring, hotplug the disks in
1849  * second level expander, BROADCAST(CHANGE) will not only be originated
1850  * in the second level expander, but also be originated in the first level
1851  * expander (see SAS protocol SAS 2r-14, 7.11 for detail), it is to say,
1852  * expander changed count in two level expanders will all increment at least
1853  * once, but the phy which chang count has changed is the source device which
1854  * we concerned.
1855  */
1856
1857 static int sas_find_bcast_dev(struct domain_device *dev,
1858                               struct domain_device **src_dev)
1859 {
1860         struct expander_device *ex = &dev->ex_dev;
1861         int ex_change_count = -1;
1862         int phy_id = -1;
1863         int res;
1864         struct domain_device *ch;
1865
1866         res = sas_get_ex_change_count(dev, &ex_change_count);
1867         if (res)
1868                 goto out;
1869         if (ex_change_count != -1 && ex_change_count != ex->ex_change_count) {
1870                 /* Just detect if this expander phys phy change count changed,
1871                 * in order to determine if this expander originate BROADCAST,
1872                 * and do not update phy change count field in our structure.
1873                 */
1874                 res = sas_find_bcast_phy(dev, &phy_id, 0, false);
1875                 if (phy_id != -1) {
1876                         *src_dev = dev;
1877                         ex->ex_change_count = ex_change_count;
1878                         SAS_DPRINTK("Expander phy change count has changed\n");
1879                         return res;
1880                 } else
1881                         SAS_DPRINTK("Expander phys DID NOT change\n");
1882         }
1883         list_for_each_entry(ch, &ex->children, siblings) {
1884                 if (ch->dev_type == SAS_EDGE_EXPANDER_DEVICE || ch->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1885                         res = sas_find_bcast_dev(ch, src_dev);
1886                         if (*src_dev)
1887                                 return res;
1888                 }
1889         }
1890 out:
1891         return res;
1892 }
1893
1894 static void sas_unregister_ex_tree(struct asd_sas_port *port, struct domain_device *dev)
1895 {
1896         struct expander_device *ex = &dev->ex_dev;
1897         struct domain_device *child, *n;
1898
1899         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1900                 set_bit(SAS_DEV_GONE, &child->state);
1901                 if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
1902                     child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
1903                         sas_unregister_ex_tree(port, child);
1904                 else
1905                         sas_unregister_dev(port, child);
1906         }
1907         sas_unregister_dev(port, dev);
1908 }
1909
1910 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1911                                          int phy_id, bool last)
1912 {
1913         struct expander_device *ex_dev = &parent->ex_dev;
1914         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1915         struct domain_device *child, *n, *found = NULL;
1916         if (last) {
1917                 list_for_each_entry_safe(child, n,
1918                         &ex_dev->children, siblings) {
1919                         if (SAS_ADDR(child->sas_addr) ==
1920                             SAS_ADDR(phy->attached_sas_addr)) {
1921                                 set_bit(SAS_DEV_GONE, &child->state);
1922                                 if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
1923                                     child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
1924                                         sas_unregister_ex_tree(parent->port, child);
1925                                 else
1926                                         sas_unregister_dev(parent->port, child);
1927                                 found = child;
1928                                 break;
1929                         }
1930                 }
1931                 sas_disable_routing(parent, phy->attached_sas_addr);
1932         }
1933         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1934         if (phy->port) {
1935                 sas_port_delete_phy(phy->port, phy->phy);
1936                 sas_device_set_phy(found, phy->port);
1937                 if (phy->port->num_phys == 0)
1938                         sas_port_delete(phy->port);
1939                 phy->port = NULL;
1940         }
1941 }
1942
1943 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1944                                           const int level)
1945 {
1946         struct expander_device *ex_root = &root->ex_dev;
1947         struct domain_device *child;
1948         int res = 0;
1949
1950         list_for_each_entry(child, &ex_root->children, siblings) {
1951                 if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
1952                     child->dev_type == SAS_FANOUT_EXPANDER_DEVICE) {
1953                         struct sas_expander_device *ex =
1954                                 rphy_to_expander_device(child->rphy);
1955
1956                         if (level > ex->level)
1957                                 res = sas_discover_bfs_by_root_level(child,
1958                                                                      level);
1959                         else if (level == ex->level)
1960                                 res = sas_ex_discover_devices(child, -1);
1961                 }
1962         }
1963         return res;
1964 }
1965
1966 static int sas_discover_bfs_by_root(struct domain_device *dev)
1967 {
1968         int res;
1969         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1970         int level = ex->level+1;
1971
1972         res = sas_ex_discover_devices(dev, -1);
1973         if (res)
1974                 goto out;
1975         do {
1976                 res = sas_discover_bfs_by_root_level(dev, level);
1977                 mb();
1978                 level += 1;
1979         } while (level <= dev->port->disc.max_level);
1980 out:
1981         return res;
1982 }
1983
1984 static int sas_discover_new(struct domain_device *dev, int phy_id)
1985 {
1986         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1987         struct domain_device *child;
1988         int res;
1989
1990         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1991                     SAS_ADDR(dev->sas_addr), phy_id);
1992         res = sas_ex_phy_discover(dev, phy_id);
1993         if (res)
1994                 return res;
1995
1996         if (sas_ex_join_wide_port(dev, phy_id))
1997                 return 0;
1998
1999         res = sas_ex_discover_devices(dev, phy_id);
2000         if (res)
2001                 return res;
2002         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
2003                 if (SAS_ADDR(child->sas_addr) ==
2004                     SAS_ADDR(ex_phy->attached_sas_addr)) {
2005                         if (child->dev_type == SAS_EDGE_EXPANDER_DEVICE ||
2006                             child->dev_type == SAS_FANOUT_EXPANDER_DEVICE)
2007                                 res = sas_discover_bfs_by_root(child);
2008                         break;
2009                 }
2010         }
2011         return res;
2012 }
2013
2014 static bool dev_type_flutter(enum sas_device_type new, enum sas_device_type old)
2015 {
2016         if (old == new)
2017                 return true;
2018
2019         /* treat device directed resets as flutter, if we went
2020          * SAS_END_DEVICE to SAS_SATA_PENDING the link needs recovery
2021          */
2022         if ((old == SAS_SATA_PENDING && new == SAS_END_DEVICE) ||
2023             (old == SAS_END_DEVICE && new == SAS_SATA_PENDING))
2024                 return true;
2025
2026         return false;
2027 }
2028
2029 static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
2030 {
2031         struct expander_device *ex = &dev->ex_dev;
2032         struct ex_phy *phy = &ex->ex_phy[phy_id];
2033         enum sas_device_type type = SAS_PHY_UNUSED;
2034         u8 sas_addr[8];
2035         int res;
2036
2037         memset(sas_addr, 0, 8);
2038         res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
2039         switch (res) {
2040         case SMP_RESP_NO_PHY:
2041                 phy->phy_state = PHY_NOT_PRESENT;
2042                 sas_unregister_devs_sas_addr(dev, phy_id, last);
2043                 return res;
2044         case SMP_RESP_PHY_VACANT:
2045                 phy->phy_state = PHY_VACANT;
2046                 sas_unregister_devs_sas_addr(dev, phy_id, last);
2047                 return res;
2048         case SMP_RESP_FUNC_ACC:
2049                 break;
2050         case -ECOMM:
2051                 break;
2052         default:
2053                 return res;
2054         }
2055
2056         if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
2057                 phy->phy_state = PHY_EMPTY;
2058                 sas_unregister_devs_sas_addr(dev, phy_id, last);
2059                 /*
2060                  * Even though the PHY is empty, for convenience we discover
2061                  * the PHY to update the PHY info, like negotiated linkrate.
2062                  */
2063                 sas_ex_phy_discover(dev, phy_id);
2064                 return res;
2065         } else if (SAS_ADDR(sas_addr) == SAS_ADDR(phy->attached_sas_addr) &&
2066                    dev_type_flutter(type, phy->attached_dev_type)) {
2067                 struct domain_device *ata_dev = sas_ex_to_ata(dev, phy_id);
2068                 char *action = "";
2069
2070                 sas_ex_phy_discover(dev, phy_id);
2071
2072                 if (ata_dev && phy->attached_dev_type == SAS_SATA_PENDING)
2073                         action = ", needs recovery";
2074                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter%s\n",
2075                             SAS_ADDR(dev->sas_addr), phy_id, action);
2076                 return res;
2077         }
2078
2079         /* we always have to delete the old device when we went here */
2080         SAS_DPRINTK("ex %016llx phy 0x%x replace %016llx\n",
2081                     SAS_ADDR(dev->sas_addr), phy_id,
2082                     SAS_ADDR(phy->attached_sas_addr));
2083         sas_unregister_devs_sas_addr(dev, phy_id, last);
2084
2085         return sas_discover_new(dev, phy_id);
2086 }
2087
2088 /**
2089  * sas_rediscover - revalidate the domain.
2090  * @dev:domain device to be detect.
2091  * @phy_id: the phy id will be detected.
2092  *
2093  * NOTE: this process _must_ quit (return) as soon as any connection
2094  * errors are encountered.  Connection recovery is done elsewhere.
2095  * Discover process only interrogates devices in order to discover the
2096  * domain.For plugging out, we un-register the device only when it is
2097  * the last phy in the port, for other phys in this port, we just delete it
2098  * from the port.For inserting, we do discovery when it is the
2099  * first phy,for other phys in this port, we add it to the port to
2100  * forming the wide-port.
2101  */
2102 static int sas_rediscover(struct domain_device *dev, const int phy_id)
2103 {
2104         struct expander_device *ex = &dev->ex_dev;
2105         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
2106         int res = 0;
2107         int i;
2108         bool last = true;       /* is this the last phy of the port */
2109
2110         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
2111                     SAS_ADDR(dev->sas_addr), phy_id);
2112
2113         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
2114                 for (i = 0; i < ex->num_phys; i++) {
2115                         struct ex_phy *phy = &ex->ex_phy[i];
2116
2117                         if (i == phy_id)
2118                                 continue;
2119                         if (SAS_ADDR(phy->attached_sas_addr) ==
2120                             SAS_ADDR(changed_phy->attached_sas_addr)) {
2121                                 SAS_DPRINTK("phy%d part of wide port with "
2122                                             "phy%d\n", phy_id, i);
2123                                 last = false;
2124                                 break;
2125                         }
2126                 }
2127                 res = sas_rediscover_dev(dev, phy_id, last);
2128         } else
2129                 res = sas_discover_new(dev, phy_id);
2130         return res;
2131 }
2132
2133 /**
2134  * sas_revalidate_domain -- revalidate the domain
2135  * @port: port to the domain of interest
2136  *
2137  * NOTE: this process _must_ quit (return) as soon as any connection
2138  * errors are encountered.  Connection recovery is done elsewhere.
2139  * Discover process only interrogates devices in order to discover the
2140  * domain.
2141  */
2142 int sas_ex_revalidate_domain(struct domain_device *port_dev)
2143 {
2144         int res;
2145         struct domain_device *dev = NULL;
2146
2147         res = sas_find_bcast_dev(port_dev, &dev);
2148         while (res == 0 && dev) {
2149                 struct expander_device *ex = &dev->ex_dev;
2150                 int i = 0, phy_id;
2151
2152                 do {
2153                         phy_id = -1;
2154                         res = sas_find_bcast_phy(dev, &phy_id, i, true);
2155                         if (phy_id == -1)
2156                                 break;
2157                         res = sas_rediscover(dev, phy_id);
2158                         i = phy_id + 1;
2159                 } while (i < ex->num_phys);
2160
2161                 dev = NULL;
2162                 res = sas_find_bcast_dev(port_dev, &dev);
2163         }
2164         return res;
2165 }
2166
2167 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
2168                     struct request *req)
2169 {
2170         struct domain_device *dev;
2171         int ret, type;
2172         struct request *rsp = req->next_rq;
2173
2174         if (!rsp) {
2175                 printk("%s: space for a smp response is missing\n",
2176                        __func__);
2177                 return -EINVAL;
2178         }
2179
2180         /* no rphy means no smp target support (ie aic94xx host) */
2181         if (!rphy)
2182                 return sas_smp_host_handler(shost, req, rsp);
2183
2184         type = rphy->identify.device_type;
2185
2186         if (type != SAS_EDGE_EXPANDER_DEVICE &&
2187             type != SAS_FANOUT_EXPANDER_DEVICE) {
2188                 printk("%s: can we send a smp request to a device?\n",
2189                        __func__);
2190                 return -EINVAL;
2191         }
2192
2193         dev = sas_find_dev_by_rphy(rphy);
2194         if (!dev) {
2195                 printk("%s: fail to find a domain_device?\n", __func__);
2196                 return -EINVAL;
2197         }
2198
2199         /* do we need to support multiple segments? */
2200         if (bio_multiple_segments(req->bio) ||
2201             bio_multiple_segments(rsp->bio)) {
2202                 printk("%s: multiple segments req %u, rsp %u\n",
2203                        __func__, blk_rq_bytes(req), blk_rq_bytes(rsp));
2204                 return -EINVAL;
2205         }
2206
2207         ret = smp_execute_task(dev, bio_data(req->bio), blk_rq_bytes(req),
2208                                bio_data(rsp->bio), blk_rq_bytes(rsp));
2209         if (ret > 0) {
2210                 /* positive number is the untransferred residual */
2211                 rsp->resid_len = ret;
2212                 req->resid_len = 0;
2213                 ret = 0;
2214         } else if (ret == 0) {
2215                 rsp->resid_len = 0;
2216                 req->resid_len = 0;
2217         }
2218
2219         return ret;
2220 }