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/pci.h>
  26 #include <linux/scatterlist.h>
  27
  28 #include "sas_internal.h"
  29
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_sas.h>
  32 #include "../scsi_sas_internal.h"
  33
  34 static int sas_discover_expander(struct domain_device *dev);
  35 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr);
  36 static int sas_configure_phy(struct domain_device *dev, int phy_id,
  37                              u8 *sas_addr, int include);
  38 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr);
  39
  40 #if 0
  41 /* FIXME: smp needs to migrate into the sas class */
  42 static ssize_t smp_portal_read(struct kobject *, char *, loff_t, size_t);
  43 static ssize_t smp_portal_write(struct kobject *, char *, loff_t, size_t);
  44 #endif
  45
  46 /* ---------- SMP task management ---------- */
  47
  48 static void smp_task_timedout(unsigned long _task)
  49 {
  50         struct sas_task *task = (void *) _task;
  51         unsigned long flags;
  52
  53         spin_lock_irqsave(&task->task_state_lock, flags);
  54         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  55                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  56         spin_unlock_irqrestore(&task->task_state_lock, flags);
  57
  58         complete(&task->completion);
  59 }
  60
  61 static void smp_task_done(struct sas_task *task)
  62 {
  63         if (!del_timer(&task->timer))
  64                 return;
  65         complete(&task->completion);
  66 }
  67
  68 /* Give it some long enough timeout. In seconds. */
  69 #define SMP_TIMEOUT 10
  70
  71 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  72                             void *resp, int resp_size)
  73 {
  74         int res;
  75         struct sas_task *task = sas_alloc_task(GFP_KERNEL);
  76         struct sas_internal *i =
  77                 to_sas_internal(dev->port->ha->core.shost->transportt);
  78
  79         if (!task)
  80                 return -ENOMEM;
  81
  82         task->dev = dev;
  83         task->task_proto = dev->tproto;
  84         sg_init_one(&task->smp_task.smp_req, req, req_size);
  85         sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  86
  87         task->task_done = smp_task_done;
  88
  89         task->timer.data = (unsigned long) task;
  90         task->timer.function = smp_task_timedout;
  91         task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  92         add_timer(&task->timer);
  93
  94         res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  95
  96         if (res) {
  97                 del_timer(&task->timer);
  98                 SAS_DPRINTK("executing SMP task failed:%d\n", res);
  99                 goto ex_err;
 100         }
 101
 102         wait_for_completion(&task->completion);
 103         res = -ETASK;
 104         if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 105                 SAS_DPRINTK("smp task timed out or aborted\n");
 106                 i->dft->lldd_abort_task(task);
 107                 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 108                         SAS_DPRINTK("SMP task aborted and not done\n");
 109                         goto ex_err;
 110                 }
 111         }
 112         if (task->task_status.resp == SAS_TASK_COMPLETE &&
 113             task->task_status.stat == SAM_GOOD)
 114                 res = 0;
 115         else
 116                 SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 117                             "status 0x%x\n", __FUNCTION__,
 118                             SAS_ADDR(dev->sas_addr),
 119                             task->task_status.resp,
 120                             task->task_status.stat);
 121 ex_err:
 122         sas_free_task(task);
 123         return res;
 124 }
 125
 126 /* ---------- Allocations ---------- */
 127
 128 static inline void *alloc_smp_req(int size)
 129 {
 130         u8 *p = kzalloc(size, GFP_KERNEL);
 131         if (p)
 132                 p[0] = SMP_REQUEST;
 133         return p;
 134 }
 135
 136 static inline void *alloc_smp_resp(int size)
 137 {
 138         return kzalloc(size, GFP_KERNEL);
 139 }
 140
 141 /* ---------- Expander configuration ---------- */
 142
 143 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 144                            void *disc_resp)
 145 {
 146         struct expander_device *ex = &dev->ex_dev;
 147         struct ex_phy *phy = &ex->ex_phy[phy_id];
 148         struct smp_resp *resp = disc_resp;
 149         struct discover_resp *dr = &resp->disc;
 150         struct sas_rphy *rphy = dev->rphy;
 151         int rediscover = (phy->phy != NULL);
 152
 153         if (!rediscover) {
 154                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 155
 156                 /* FIXME: error_handling */
 157                 BUG_ON(!phy->phy);
 158         }
 159
 160         switch (resp->result) {
 161         case SMP_RESP_PHY_VACANT:
 162                 phy->phy_state = PHY_VACANT;
 163                 return;
 164         default:
 165                 phy->phy_state = PHY_NOT_PRESENT;
 166                 return;
 167         case SMP_RESP_FUNC_ACC:
 168                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 169                 break;
 170         }
 171
 172         phy->phy_id = phy_id;
 173         phy->attached_dev_type = dr->attached_dev_type;
 174         phy->linkrate = dr->linkrate;
 175         phy->attached_sata_host = dr->attached_sata_host;
 176         phy->attached_sata_dev  = dr->attached_sata_dev;
 177         phy->attached_sata_ps   = dr->attached_sata_ps;
 178         phy->attached_iproto = dr->iproto << 1;
 179         phy->attached_tproto = dr->tproto << 1;
 180         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 181         phy->attached_phy_id = dr->attached_phy_id;
 182         phy->phy_change_count = dr->change_count;
 183         phy->routing_attr = dr->routing_attr;
 184         phy->virtual = dr->virtual;
 185         phy->last_da_index = -1;
 186
 187         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 188         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 189         phy->phy->identify.phy_identifier = phy_id;
 190         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 191         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 192         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 193         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 194         phy->phy->negotiated_linkrate = phy->linkrate;
 195
 196         if (!rediscover)
 197                 sas_phy_add(phy->phy);
 198
 199         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 200                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 201                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 202                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 203                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 204                     SAS_ADDR(phy->attached_sas_addr));
 205
 206         return;
 207 }
 208
 209 #define DISCOVER_REQ_SIZE  16
 210 #define DISCOVER_RESP_SIZE 56
 211
 212 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 213 {
 214         struct expander_device *ex = &dev->ex_dev;
 215         int  res = 0;
 216         u8   *disc_req;
 217         u8   *disc_resp;
 218
 219         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 220         if (!disc_req)
 221                 return -ENOMEM;
 222
 223         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 224         if (!disc_resp) {
 225                 kfree(disc_req);
 226                 return -ENOMEM;
 227         }
 228
 229         disc_req[1] = SMP_DISCOVER;
 230
 231         if (0 <= single && single < ex->num_phys) {
 232                 disc_req[9] = single;
 233                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 234                                        disc_resp, DISCOVER_RESP_SIZE);
 235                 if (res)
 236                         goto out_err;
 237                 sas_set_ex_phy(dev, single, disc_resp);
 238         } else {
 239                 int i;
 240
 241                 for (i = 0; i < ex->num_phys; i++) {
 242                         disc_req[9] = i;
 243                         res = smp_execute_task(dev, disc_req,
 244                                                DISCOVER_REQ_SIZE, disc_resp,
 245                                                DISCOVER_RESP_SIZE);
 246                         if (res)
 247                                 goto out_err;
 248                         sas_set_ex_phy(dev, i, disc_resp);
 249                 }
 250         }
 251 out_err:
 252         kfree(disc_resp);
 253         kfree(disc_req);
 254         return res;
 255 }
 256
 257 static int sas_expander_discover(struct domain_device *dev)
 258 {
 259         struct expander_device *ex = &dev->ex_dev;
 260         int res = -ENOMEM;
 261
 262         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 263         if (!ex->ex_phy)
 264                 return -ENOMEM;
 265
 266         res = sas_ex_phy_discover(dev, -1);
 267         if (res)
 268                 goto out_err;
 269
 270         return 0;
 271  out_err:
 272         kfree(ex->ex_phy);
 273         ex->ex_phy = NULL;
 274         return res;
 275 }
 276
 277 #define MAX_EXPANDER_PHYS 128
 278
 279 static void ex_assign_report_general(struct domain_device *dev,
 280                                             struct smp_resp *resp)
 281 {
 282         struct report_general_resp *rg = &resp->rg;
 283
 284         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 285         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 286         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 287         dev->ex_dev.conf_route_table = rg->conf_route_table;
 288         dev->ex_dev.configuring = rg->configuring;
 289         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 290 }
 291
 292 #define RG_REQ_SIZE   8
 293 #define RG_RESP_SIZE 32
 294
 295 static int sas_ex_general(struct domain_device *dev)
 296 {
 297         u8 *rg_req;
 298         struct smp_resp *rg_resp;
 299         int res;
 300         int i;
 301
 302         rg_req = alloc_smp_req(RG_REQ_SIZE);
 303         if (!rg_req)
 304                 return -ENOMEM;
 305
 306         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 307         if (!rg_resp) {
 308                 kfree(rg_req);
 309                 return -ENOMEM;
 310         }
 311
 312         rg_req[1] = SMP_REPORT_GENERAL;
 313
 314         for (i = 0; i < 5; i++) {
 315                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 316                                        RG_RESP_SIZE);
 317
 318                 if (res) {
 319                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 320                                     SAS_ADDR(dev->sas_addr), res);
 321                         goto out;
 322                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 323                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 324                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 325                         res = rg_resp->result;
 326                         goto out;
 327                 }
 328
 329                 ex_assign_report_general(dev, rg_resp);
 330
 331                 if (dev->ex_dev.configuring) {
 332                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 333                                     SAS_ADDR(dev->sas_addr));
 334                         schedule_timeout_interruptible(5*HZ);
 335                 } else
 336                         break;
 337         }
 338 out:
 339         kfree(rg_req);
 340         kfree(rg_resp);
 341         return res;
 342 }
 343
 344 static void ex_assign_manuf_info(struct domain_device *dev, void
 345                                         *_mi_resp)
 346 {
 347         u8 *mi_resp = _mi_resp;
 348         struct sas_rphy *rphy = dev->rphy;
 349         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 350
 351         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 352         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 353         memcpy(edev->product_rev, mi_resp + 36,
 354                SAS_EXPANDER_PRODUCT_REV_LEN);
 355
 356         if (mi_resp[8] & 1) {
 357                 memcpy(edev->component_vendor_id, mi_resp + 40,
 358                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 359                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 360                 edev->component_revision_id = mi_resp[50];
 361         }
 362 }
 363
 364 #define MI_REQ_SIZE   8
 365 #define MI_RESP_SIZE 64
 366
 367 static int sas_ex_manuf_info(struct domain_device *dev)
 368 {
 369         u8 *mi_req;
 370         u8 *mi_resp;
 371         int res;
 372
 373         mi_req = alloc_smp_req(MI_REQ_SIZE);
 374         if (!mi_req)
 375                 return -ENOMEM;
 376
 377         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 378         if (!mi_resp) {
 379                 kfree(mi_req);
 380                 return -ENOMEM;
 381         }
 382
 383         mi_req[1] = SMP_REPORT_MANUF_INFO;
 384
 385         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 386         if (res) {
 387                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 388                             SAS_ADDR(dev->sas_addr), res);
 389                 goto out;
 390         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 391                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 392                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 393                 goto out;
 394         }
 395
 396         ex_assign_manuf_info(dev, mi_resp);
 397 out:
 398         kfree(mi_req);
 399         kfree(mi_resp);
 400         return res;
 401 }
 402
 403 #define PC_REQ_SIZE  44
 404 #define PC_RESP_SIZE 8
 405
 406 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 407                         enum phy_func phy_func,
 408                         struct sas_phy_linkrates *rates)
 409 {
 410         u8 *pc_req;
 411         u8 *pc_resp;
 412         int res;
 413
 414         pc_req = alloc_smp_req(PC_REQ_SIZE);
 415         if (!pc_req)
 416                 return -ENOMEM;
 417
 418         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 419         if (!pc_resp) {
 420                 kfree(pc_req);
 421                 return -ENOMEM;
 422         }
 423
 424         pc_req[1] = SMP_PHY_CONTROL;
 425         pc_req[9] = phy_id;
 426         pc_req[10]= phy_func;
 427         if (rates) {
 428                 pc_req[32] = rates->minimum_linkrate << 4;
 429                 pc_req[33] = rates->maximum_linkrate << 4;
 430         }
 431
 432         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 433
 434         kfree(pc_resp);
 435         kfree(pc_req);
 436         return res;
 437 }
 438
 439 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 440 {
 441         struct expander_device *ex = &dev->ex_dev;
 442         struct ex_phy *phy = &ex->ex_phy[phy_id];
 443
 444         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 445         phy->linkrate = SAS_PHY_DISABLED;
 446 }
 447
 448 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 449 {
 450         struct expander_device *ex = &dev->ex_dev;
 451         int i;
 452
 453         for (i = 0; i < ex->num_phys; i++) {
 454                 struct ex_phy *phy = &ex->ex_phy[i];
 455
 456                 if (phy->phy_state == PHY_VACANT ||
 457                     phy->phy_state == PHY_NOT_PRESENT)
 458                         continue;
 459
 460                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 461                         sas_ex_disable_phy(dev, i);
 462         }
 463 }
 464
 465 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 466                                             u8 *sas_addr)
 467 {
 468         struct domain_device *dev;
 469
 470         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 471                 return 1;
 472         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 473                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 474                         return 1;
 475         }
 476         return 0;
 477 }
 478
 479 #define RPEL_REQ_SIZE   16
 480 #define RPEL_RESP_SIZE  32
 481 int sas_smp_get_phy_events(struct sas_phy *phy)
 482 {
 483         int res;
 484         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 485         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 486         u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
 487         u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
 488
 489         if (!resp)
 490                 return -ENOMEM;
 491
 492         req[1] = SMP_REPORT_PHY_ERR_LOG;
 493         req[9] = phy->number;
 494
 495         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 496                                     resp, RPEL_RESP_SIZE);
 497
 498         if (!res)
 499                 goto out;
 500
 501         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 502         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 503         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 504         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 505
 506  out:
 507         kfree(resp);
 508         return res;
 509
 510 }
 511
 512 #define RPS_REQ_SIZE  16
 513 #define RPS_RESP_SIZE 60
 514
 515 static int sas_get_report_phy_sata(struct domain_device *dev,
 516                                           int phy_id,
 517                                           struct smp_resp *rps_resp)
 518 {
 519         int res;
 520         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 521
 522         if (!rps_req)
 523                 return -ENOMEM;
 524
 525         rps_req[1] = SMP_REPORT_PHY_SATA;
 526         rps_req[9] = phy_id;
 527
 528         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 529                                     rps_resp, RPS_RESP_SIZE);
 530
 531         kfree(rps_req);
 532         return 0;
 533 }
 534
 535 static void sas_ex_get_linkrate(struct domain_device *parent,
 536                                        struct domain_device *child,
 537                                        struct ex_phy *parent_phy)
 538 {
 539         struct expander_device *parent_ex = &parent->ex_dev;
 540         struct sas_port *port;
 541         int i;
 542
 543         child->pathways = 0;
 544
 545         port = parent_phy->port;
 546
 547         for (i = 0; i < parent_ex->num_phys; i++) {
 548                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 549
 550                 if (phy->phy_state == PHY_VACANT ||
 551                     phy->phy_state == PHY_NOT_PRESENT)
 552                         continue;
 553
 554                 if (SAS_ADDR(phy->attached_sas_addr) ==
 555                     SAS_ADDR(child->sas_addr)) {
 556
 557                         child->min_linkrate = min(parent->min_linkrate,
 558                                                   phy->linkrate);
 559                         child->max_linkrate = max(parent->max_linkrate,
 560                                                   phy->linkrate);
 561                         child->pathways++;
 562                         sas_port_add_phy(port, phy->phy);
 563                 }
 564         }
 565         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 566         child->pathways = min(child->pathways, parent->pathways);
 567 }
 568
 569 static struct domain_device *sas_ex_discover_end_dev(
 570         struct domain_device *parent, int phy_id)
 571 {
 572         struct expander_device *parent_ex = &parent->ex_dev;
 573         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 574         struct domain_device *child = NULL;
 575         struct sas_rphy *rphy;
 576         int res;
 577
 578         if (phy->attached_sata_host || phy->attached_sata_ps)
 579                 return NULL;
 580
 581         child = kzalloc(sizeof(*child), GFP_KERNEL);
 582         if (!child)
 583                 return NULL;
 584
 585         child->parent = parent;
 586         child->port   = parent->port;
 587         child->iproto = phy->attached_iproto;
 588         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 589         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 590         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 591         BUG_ON(!phy->port);
 592         /* FIXME: better error handling*/
 593         BUG_ON(sas_port_add(phy->port) != 0);
 594         sas_ex_get_linkrate(parent, child, phy);
 595
 596         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 597                 child->dev_type = SATA_DEV;
 598                 if (phy->attached_tproto & SAS_PROTO_STP)
 599                         child->tproto = phy->attached_tproto;
 600                 if (phy->attached_sata_dev)
 601                         child->tproto |= SATA_DEV;
 602                 res = sas_get_report_phy_sata(parent, phy_id,
 603                                               &child->sata_dev.rps_resp);
 604                 if (res) {
 605                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 606                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 607                                     phy_id, res);
 608                         kfree(child);
 609                         return NULL;
 610                 }
 611                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 612                        sizeof(struct dev_to_host_fis));
 613                 sas_init_dev(child);
 614                 res = sas_discover_sata(child);
 615                 if (res) {
 616                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 617                                     "%016llx:0x%x returned 0x%x\n",
 618                                     SAS_ADDR(child->sas_addr),
 619                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 620                         kfree(child);
 621                         return NULL;
 622                 }
 623         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 624                 child->dev_type = SAS_END_DEV;
 625                 rphy = sas_end_device_alloc(phy->port);
 626                 /* FIXME: error handling */
 627                 BUG_ON(!rphy);
 628                 child->tproto = phy->attached_tproto;
 629                 sas_init_dev(child);
 630
 631                 child->rphy = rphy;
 632                 sas_fill_in_rphy(child, rphy);
 633
 634                 spin_lock(&parent->port->dev_list_lock);
 635                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 636                 spin_unlock(&parent->port->dev_list_lock);
 637
 638                 res = sas_discover_end_dev(child);
 639                 if (res) {
 640                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 641                                     "at %016llx:0x%x returned 0x%x\n",
 642                                     SAS_ADDR(child->sas_addr),
 643                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 644                         /* FIXME: this kfrees list elements without removing them */
 645                         //kfree(child);
 646                         return NULL;
 647                 }
 648         } else {
 649                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 650                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 651                             phy_id);
 652         }
 653
 654         list_add_tail(&child->siblings, &parent_ex->children);
 655         return child;
 656 }
 657
 658 static struct domain_device *sas_ex_discover_expander(
 659         struct domain_device *parent, int phy_id)
 660 {
 661         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 662         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 663         struct domain_device *child = NULL;
 664         struct sas_rphy *rphy;
 665         struct sas_expander_device *edev;
 666         struct asd_sas_port *port;
 667         int res;
 668
 669         if (phy->routing_attr == DIRECT_ROUTING) {
 670                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 671                             "allowed\n",
 672                             SAS_ADDR(parent->sas_addr), phy_id,
 673                             SAS_ADDR(phy->attached_sas_addr),
 674                             phy->attached_phy_id);
 675                 return NULL;
 676         }
 677         child = kzalloc(sizeof(*child), GFP_KERNEL);
 678         if (!child)
 679                 return NULL;
 680
 681         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 682         /* FIXME: better error handling */
 683         BUG_ON(sas_port_add(phy->port) != 0);
 684
 685
 686         switch (phy->attached_dev_type) {
 687         case EDGE_DEV:
 688                 rphy = sas_expander_alloc(phy->port,
 689                                           SAS_EDGE_EXPANDER_DEVICE);
 690                 break;
 691         case FANOUT_DEV:
 692                 rphy = sas_expander_alloc(phy->port,
 693                                           SAS_FANOUT_EXPANDER_DEVICE);
 694                 break;
 695         default:
 696                 rphy = NULL;    /* shut gcc up */
 697                 BUG();
 698         }
 699         port = parent->port;
 700         child->rphy = rphy;
 701         edev = rphy_to_expander_device(rphy);
 702         child->dev_type = phy->attached_dev_type;
 703         child->parent = parent;
 704         child->port = port;
 705         child->iproto = phy->attached_iproto;
 706         child->tproto = phy->attached_tproto;
 707         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 708         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 709         sas_ex_get_linkrate(parent, child, phy);
 710         edev->level = parent_ex->level + 1;
 711         parent->port->disc.max_level = max(parent->port->disc.max_level,
 712                                            edev->level);
 713         sas_init_dev(child);
 714         sas_fill_in_rphy(child, rphy);
 715         sas_rphy_add(rphy);
 716
 717         spin_lock(&parent->port->dev_list_lock);
 718         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 719         spin_unlock(&parent->port->dev_list_lock);
 720
 721         res = sas_discover_expander(child);
 722         if (res) {
 723                 kfree(child);
 724                 return NULL;
 725         }
 726         list_add_tail(&child->siblings, &parent->ex_dev.children);
 727         return child;
 728 }
 729
 730 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 731 {
 732         struct expander_device *ex = &dev->ex_dev;
 733         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 734         struct domain_device *child = NULL;
 735         int res = 0;
 736
 737         /* Phy state */
 738         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 739                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 740                         res = sas_ex_phy_discover(dev, phy_id);
 741                 if (res)
 742                         return res;
 743         }
 744
 745         /* Parent and domain coherency */
 746         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 747                              SAS_ADDR(dev->port->sas_addr))) {
 748                 sas_add_parent_port(dev, phy_id);
 749                 return 0;
 750         }
 751         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 752                             SAS_ADDR(dev->parent->sas_addr))) {
 753                 sas_add_parent_port(dev, phy_id);
 754                 if (ex_phy->routing_attr == TABLE_ROUTING)
 755                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 756                 return 0;
 757         }
 758
 759         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 760                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 761
 762         if (ex_phy->attached_dev_type == NO_DEVICE) {
 763                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 764                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 765                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 766                 }
 767                 return 0;
 768         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 769                 return 0;
 770
 771         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 772             ex_phy->attached_dev_type != FANOUT_DEV &&
 773             ex_phy->attached_dev_type != EDGE_DEV) {
 774                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 775                             "phy 0x%x\n", ex_phy->attached_dev_type,
 776                             SAS_ADDR(dev->sas_addr),
 777                             phy_id);
 778                 return 0;
 779         }
 780
 781         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 782         if (res) {
 783                 SAS_DPRINTK("configure routing for dev %016llx "
 784                             "reported 0x%x. Forgotten\n",
 785                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 786                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 787                 return res;
 788         }
 789
 790         switch (ex_phy->attached_dev_type) {
 791         case SAS_END_DEV:
 792                 child = sas_ex_discover_end_dev(dev, phy_id);
 793                 break;
 794         case FANOUT_DEV:
 795                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 796                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 797                                     "attached to ex %016llx phy 0x%x\n",
 798                                     SAS_ADDR(ex_phy->attached_sas_addr),
 799                                     ex_phy->attached_phy_id,
 800                                     SAS_ADDR(dev->sas_addr),
 801                                     phy_id);
 802                         sas_ex_disable_phy(dev, phy_id);
 803                         break;
 804                 } else
 805                         memcpy(dev->port->disc.fanout_sas_addr,
 806                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 807                 /* fallthrough */
 808         case EDGE_DEV:
 809                 child = sas_ex_discover_expander(dev, phy_id);
 810                 break;
 811         default:
 812                 break;
 813         }
 814
 815         if (child) {
 816                 int i;
 817
 818                 for (i = 0; i < ex->num_phys; i++) {
 819                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 820                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 821                                 continue;
 822
 823                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 824                             SAS_ADDR(child->sas_addr))
 825                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 826                 }
 827         }
 828
 829         return res;
 830 }
 831
 832 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 833 {
 834         struct expander_device *ex = &dev->ex_dev;
 835         int i;
 836
 837         for (i = 0; i < ex->num_phys; i++) {
 838                 struct ex_phy *phy = &ex->ex_phy[i];
 839
 840                 if (phy->phy_state == PHY_VACANT ||
 841                     phy->phy_state == PHY_NOT_PRESENT)
 842                         continue;
 843
 844                 if ((phy->attached_dev_type == EDGE_DEV ||
 845                      phy->attached_dev_type == FANOUT_DEV) &&
 846                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 847
 848                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 849
 850                         return 1;
 851                 }
 852         }
 853         return 0;
 854 }
 855
 856 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 857 {
 858         struct expander_device *ex = &dev->ex_dev;
 859         struct domain_device *child;
 860         u8 sub_addr[8] = {0, };
 861
 862         list_for_each_entry(child, &ex->children, siblings) {
 863                 if (child->dev_type != EDGE_DEV &&
 864                     child->dev_type != FANOUT_DEV)
 865                         continue;
 866                 if (sub_addr[0] == 0) {
 867                         sas_find_sub_addr(child, sub_addr);
 868                         continue;
 869                 } else {
 870                         u8 s2[8];
 871
 872                         if (sas_find_sub_addr(child, s2) &&
 873                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 874
 875                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 876                                             "diverges from subtractive "
 877                                             "boundary %016llx\n",
 878                                             SAS_ADDR(dev->sas_addr),
 879                                             SAS_ADDR(child->sas_addr),
 880                                             SAS_ADDR(s2),
 881                                             SAS_ADDR(sub_addr));
 882
 883                                 sas_ex_disable_port(child, s2);
 884                         }
 885                 }
 886         }
 887         return 0;
 888 }
 889 /**
 890  * sas_ex_discover_devices -- discover devices attached to this expander
 891  * dev: pointer to the expander domain device
 892  * single: if you want to do a single phy, else set to -1;
 893  *
 894  * Configure this expander for use with its devices and register the
 895  * devices of this expander.
 896  */
 897 static int sas_ex_discover_devices(struct domain_device *dev, int single)
 898 {
 899         struct expander_device *ex = &dev->ex_dev;
 900         int i = 0, end = ex->num_phys;
 901         int res = 0;
 902
 903         if (0 <= single && single < end) {
 904                 i = single;
 905                 end = i+1;
 906         }
 907
 908         for ( ; i < end; i++) {
 909                 struct ex_phy *ex_phy = &ex->ex_phy[i];
 910
 911                 if (ex_phy->phy_state == PHY_VACANT ||
 912                     ex_phy->phy_state == PHY_NOT_PRESENT ||
 913                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
 914                         continue;
 915
 916                 switch (ex_phy->linkrate) {
 917                 case SAS_PHY_DISABLED:
 918                 case SAS_PHY_RESET_PROBLEM:
 919                 case SAS_SATA_PORT_SELECTOR:
 920                         continue;
 921                 default:
 922                         res = sas_ex_discover_dev(dev, i);
 923                         if (res)
 924                                 break;
 925                         continue;
 926                 }
 927         }
 928
 929         if (!res)
 930                 sas_check_level_subtractive_boundary(dev);
 931
 932         return res;
 933 }
 934
 935 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
 936 {
 937         struct expander_device *ex = &dev->ex_dev;
 938         int i;
 939         u8  *sub_sas_addr = NULL;
 940
 941         if (dev->dev_type != EDGE_DEV)
 942                 return 0;
 943
 944         for (i = 0; i < ex->num_phys; i++) {
 945                 struct ex_phy *phy = &ex->ex_phy[i];
 946
 947                 if (phy->phy_state == PHY_VACANT ||
 948                     phy->phy_state == PHY_NOT_PRESENT)
 949                         continue;
 950
 951                 if ((phy->attached_dev_type == FANOUT_DEV ||
 952                      phy->attached_dev_type == EDGE_DEV) &&
 953                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 954
 955                         if (!sub_sas_addr)
 956                                 sub_sas_addr = &phy->attached_sas_addr[0];
 957                         else if (SAS_ADDR(sub_sas_addr) !=
 958                                  SAS_ADDR(phy->attached_sas_addr)) {
 959
 960                                 SAS_DPRINTK("ex %016llx phy 0x%x "
 961                                             "diverges(%016llx) on subtractive "
 962                                             "boundary(%016llx). Disabled\n",
 963                                             SAS_ADDR(dev->sas_addr), i,
 964                                             SAS_ADDR(phy->attached_sas_addr),
 965                                             SAS_ADDR(sub_sas_addr));
 966                                 sas_ex_disable_phy(dev, i);
 967                         }
 968                 }
 969         }
 970         return 0;
 971 }
 972
 973 static void sas_print_parent_topology_bug(struct domain_device *child,
 974                                                  struct ex_phy *parent_phy,
 975                                                  struct ex_phy *child_phy)
 976 {
 977         static const char ra_char[] = {
 978                 [DIRECT_ROUTING] = 'D',
 979                 [SUBTRACTIVE_ROUTING] = 'S',
 980                 [TABLE_ROUTING] = 'T',
 981         };
 982         static const char *ex_type[] = {
 983                 [EDGE_DEV] = "edge",
 984                 [FANOUT_DEV] = "fanout",
 985         };
 986         struct domain_device *parent = child->parent;
 987
 988         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
 989                    "has %c:%c routing link!\n",
 990
 991                    ex_type[parent->dev_type],
 992                    SAS_ADDR(parent->sas_addr),
 993                    parent_phy->phy_id,
 994
 995                    ex_type[child->dev_type],
 996                    SAS_ADDR(child->sas_addr),
 997                    child_phy->phy_id,
 998
 999                    ra_char[parent_phy->routing_attr],
1000                    ra_char[child_phy->routing_attr]);
1001 }
1002
1003 static int sas_check_eeds(struct domain_device *child,
1004                                  struct ex_phy *parent_phy,
1005                                  struct ex_phy *child_phy)
1006 {
1007         int res = 0;
1008         struct domain_device *parent = child->parent;
1009
1010         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1011                 res = -ENODEV;
1012                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1013                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1014                             SAS_ADDR(parent->sas_addr),
1015                             parent_phy->phy_id,
1016                             SAS_ADDR(child->sas_addr),
1017                             child_phy->phy_id,
1018                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1019         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1020                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1021                        SAS_ADDR_SIZE);
1022                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1023                        SAS_ADDR_SIZE);
1024         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1025                     SAS_ADDR(parent->sas_addr)) ||
1026                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1027                     SAS_ADDR(child->sas_addr)))
1028                    &&
1029                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1030                      SAS_ADDR(parent->sas_addr)) ||
1031                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1032                      SAS_ADDR(child->sas_addr))))
1033                 ;
1034         else {
1035                 res = -ENODEV;
1036                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1037                             "phy 0x%x link forms a third EEDS!\n",
1038                             SAS_ADDR(parent->sas_addr),
1039                             parent_phy->phy_id,
1040                             SAS_ADDR(child->sas_addr),
1041                             child_phy->phy_id);
1042         }
1043
1044         return res;
1045 }
1046
1047 /* Here we spill over 80 columns.  It is intentional.
1048  */
1049 static int sas_check_parent_topology(struct domain_device *child)
1050 {
1051         struct expander_device *child_ex = &child->ex_dev;
1052         struct expander_device *parent_ex;
1053         int i;
1054         int res = 0;
1055
1056         if (!child->parent)
1057                 return 0;
1058
1059         if (child->parent->dev_type != EDGE_DEV &&
1060             child->parent->dev_type != FANOUT_DEV)
1061                 return 0;
1062
1063         parent_ex = &child->parent->ex_dev;
1064
1065         for (i = 0; i < parent_ex->num_phys; i++) {
1066                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1067                 struct ex_phy *child_phy;
1068
1069                 if (parent_phy->phy_state == PHY_VACANT ||
1070                     parent_phy->phy_state == PHY_NOT_PRESENT)
1071                         continue;
1072
1073                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1074                         continue;
1075
1076                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1077
1078                 switch (child->parent->dev_type) {
1079                 case EDGE_DEV:
1080                         if (child->dev_type == FANOUT_DEV) {
1081                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1082                                     child_phy->routing_attr != TABLE_ROUTING) {
1083                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1084                                         res = -ENODEV;
1085                                 }
1086                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1087                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1088                                         res = sas_check_eeds(child, parent_phy, child_phy);
1089                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1090                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1091                                         res = -ENODEV;
1092                                 }
1093                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1094                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1095                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1096                                 res = -ENODEV;
1097                         }
1098                         break;
1099                 case FANOUT_DEV:
1100                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1101                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1102                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1103                                 res = -ENODEV;
1104                         }
1105                         break;
1106                 default:
1107                         break;
1108                 }
1109         }
1110
1111         return res;
1112 }
1113
1114 #define RRI_REQ_SIZE  16
1115 #define RRI_RESP_SIZE 44
1116
1117 static int sas_configure_present(struct domain_device *dev, int phy_id,
1118                                  u8 *sas_addr, int *index, int *present)
1119 {
1120         int i, res = 0;
1121         struct expander_device *ex = &dev->ex_dev;
1122         struct ex_phy *phy = &ex->ex_phy[phy_id];
1123         u8 *rri_req;
1124         u8 *rri_resp;
1125
1126         *present = 0;
1127         *index = 0;
1128
1129         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1130         if (!rri_req)
1131                 return -ENOMEM;
1132
1133         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1134         if (!rri_resp) {
1135                 kfree(rri_req);
1136                 return -ENOMEM;
1137         }
1138
1139         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1140         rri_req[9] = phy_id;
1141
1142         for (i = 0; i < ex->max_route_indexes ; i++) {
1143                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1144                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1145                                        RRI_RESP_SIZE);
1146                 if (res)
1147                         goto out;
1148                 res = rri_resp[2];
1149                 if (res == SMP_RESP_NO_INDEX) {
1150                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1151                                     "phy 0x%x index 0x%x\n",
1152                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1153                         goto out;
1154                 } else if (res != SMP_RESP_FUNC_ACC) {
1155                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1156                                     "result 0x%x\n", __FUNCTION__,
1157                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1158                         goto out;
1159                 }
1160                 if (SAS_ADDR(sas_addr) != 0) {
1161                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1162                                 *index = i;
1163                                 if ((rri_resp[12] & 0x80) == 0x80)
1164                                         *present = 0;
1165                                 else
1166                                         *present = 1;
1167                                 goto out;
1168                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1169                                 *index = i;
1170                                 *present = 0;
1171                                 goto out;
1172                         }
1173                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1174                            phy->last_da_index < i) {
1175                         phy->last_da_index = i;
1176                         *index = i;
1177                         *present = 0;
1178                         goto out;
1179                 }
1180         }
1181         res = -1;
1182 out:
1183         kfree(rri_req);
1184         kfree(rri_resp);
1185         return res;
1186 }
1187
1188 #define CRI_REQ_SIZE  44
1189 #define CRI_RESP_SIZE  8
1190
1191 static int sas_configure_set(struct domain_device *dev, int phy_id,
1192                              u8 *sas_addr, int index, int include)
1193 {
1194         int res;
1195         u8 *cri_req;
1196         u8 *cri_resp;
1197
1198         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1199         if (!cri_req)
1200                 return -ENOMEM;
1201
1202         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1203         if (!cri_resp) {
1204                 kfree(cri_req);
1205                 return -ENOMEM;
1206         }
1207
1208         cri_req[1] = SMP_CONF_ROUTE_INFO;
1209         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1210         cri_req[9] = phy_id;
1211         if (SAS_ADDR(sas_addr) == 0 || !include)
1212                 cri_req[12] |= 0x80;
1213         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1214
1215         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1216                                CRI_RESP_SIZE);
1217         if (res)
1218                 goto out;
1219         res = cri_resp[2];
1220         if (res == SMP_RESP_NO_INDEX) {
1221                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1222                             "index 0x%x\n",
1223                             SAS_ADDR(dev->sas_addr), phy_id, index);
1224         }
1225 out:
1226         kfree(cri_req);
1227         kfree(cri_resp);
1228         return res;
1229 }
1230
1231 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1232                                     u8 *sas_addr, int include)
1233 {
1234         int index;
1235         int present;
1236         int res;
1237
1238         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1239         if (res)
1240                 return res;
1241         if (include ^ present)
1242                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1243
1244         return res;
1245 }
1246
1247 /**
1248  * sas_configure_parent -- configure routing table of parent
1249  * parent: parent expander
1250  * child: child expander
1251  * sas_addr: SAS port identifier of device directly attached to child
1252  */
1253 static int sas_configure_parent(struct domain_device *parent,
1254                                 struct domain_device *child,
1255                                 u8 *sas_addr, int include)
1256 {
1257         struct expander_device *ex_parent = &parent->ex_dev;
1258         int res = 0;
1259         int i;
1260
1261         if (parent->parent) {
1262                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1263                                            include);
1264                 if (res)
1265                         return res;
1266         }
1267
1268         if (ex_parent->conf_route_table == 0) {
1269                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1270                             SAS_ADDR(parent->sas_addr));
1271                 return 0;
1272         }
1273
1274         for (i = 0; i < ex_parent->num_phys; i++) {
1275                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1276
1277                 if ((phy->routing_attr == TABLE_ROUTING) &&
1278                     (SAS_ADDR(phy->attached_sas_addr) ==
1279                      SAS_ADDR(child->sas_addr))) {
1280                         res = sas_configure_phy(parent, i, sas_addr, include);
1281                         if (res)
1282                                 return res;
1283                 }
1284         }
1285
1286         return res;
1287 }
1288
1289 /**
1290  * sas_configure_routing -- configure routing
1291  * dev: expander device
1292  * sas_addr: port identifier of device directly attached to the expander device
1293  */
1294 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1295 {
1296         if (dev->parent)
1297                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1298         return 0;
1299 }
1300
1301 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1302 {
1303         if (dev->parent)
1304                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1305         return 0;
1306 }
1307
1308 #if 0
1309 #define SMP_BIN_ATTR_NAME "smp_portal"
1310
1311 static void sas_ex_smp_hook(struct domain_device *dev)
1312 {
1313         struct expander_device *ex_dev = &dev->ex_dev;
1314         struct bin_attribute *bin_attr = &ex_dev->smp_bin_attr;
1315
1316         memset(bin_attr, 0, sizeof(*bin_attr));
1317
1318         bin_attr->attr.name = SMP_BIN_ATTR_NAME;
1319         bin_attr->attr.owner = THIS_MODULE;
1320         bin_attr->attr.mode = 0600;
1321
1322         bin_attr->size = 0;
1323         bin_attr->private = NULL;
1324         bin_attr->read = smp_portal_read;
1325         bin_attr->write= smp_portal_write;
1326         bin_attr->mmap = NULL;
1327
1328         ex_dev->smp_portal_pid = -1;
1329         init_MUTEX(&ex_dev->smp_sema);
1330 }
1331 #endif
1332
1333 /**
1334  * sas_discover_expander -- expander discovery
1335  * @ex: pointer to expander domain device
1336  *
1337  * See comment in sas_discover_sata().
1338  */
1339 static int sas_discover_expander(struct domain_device *dev)
1340 {
1341         int res;
1342
1343         res = sas_notify_lldd_dev_found(dev);
1344         if (res)
1345                 return res;
1346
1347         res = sas_ex_general(dev);
1348         if (res)
1349                 goto out_err;
1350         res = sas_ex_manuf_info(dev);
1351         if (res)
1352                 goto out_err;
1353
1354         res = sas_expander_discover(dev);
1355         if (res) {
1356                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1357                             SAS_ADDR(dev->sas_addr), res);
1358                 goto out_err;
1359         }
1360
1361         sas_check_ex_subtractive_boundary(dev);
1362         res = sas_check_parent_topology(dev);
1363         if (res)
1364                 goto out_err;
1365         return 0;
1366 out_err:
1367         sas_notify_lldd_dev_gone(dev);
1368         return res;
1369 }
1370
1371 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1372 {
1373         int res = 0;
1374         struct domain_device *dev;
1375
1376         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1377                 if (dev->dev_type == EDGE_DEV ||
1378                     dev->dev_type == FANOUT_DEV) {
1379                         struct sas_expander_device *ex =
1380                                 rphy_to_expander_device(dev->rphy);
1381
1382                         if (level == ex->level)
1383                                 res = sas_ex_discover_devices(dev, -1);
1384                         else if (level > 0)
1385                                 res = sas_ex_discover_devices(port->port_dev, -1);
1386
1387                 }
1388         }
1389
1390         return res;
1391 }
1392
1393 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1394 {
1395         int res;
1396         int level;
1397
1398         do {
1399                 level = port->disc.max_level;
1400                 res = sas_ex_level_discovery(port, level);
1401                 mb();
1402         } while (level < port->disc.max_level);
1403
1404         return res;
1405 }
1406
1407 int sas_discover_root_expander(struct domain_device *dev)
1408 {
1409         int res;
1410         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1411
1412         sas_rphy_add(dev->rphy);
1413
1414         ex->level = dev->port->disc.max_level; /* 0 */
1415         res = sas_discover_expander(dev);
1416         if (!res)
1417                 sas_ex_bfs_disc(dev->port);
1418
1419         return res;
1420 }
1421
1422 /* ---------- Domain revalidation ---------- */
1423
1424 static int sas_get_phy_discover(struct domain_device *dev,
1425                                 int phy_id, struct smp_resp *disc_resp)
1426 {
1427         int res;
1428         u8 *disc_req;
1429
1430         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1431         if (!disc_req)
1432                 return -ENOMEM;
1433
1434         disc_req[1] = SMP_DISCOVER;
1435         disc_req[9] = phy_id;
1436
1437         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1438                                disc_resp, DISCOVER_RESP_SIZE);
1439         if (res)
1440                 goto out;
1441         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1442                 res = disc_resp->result;
1443                 goto out;
1444         }
1445 out:
1446         kfree(disc_req);
1447         return res;
1448 }
1449
1450 static int sas_get_phy_change_count(struct domain_device *dev,
1451                                     int phy_id, int *pcc)
1452 {
1453         int res;
1454         struct smp_resp *disc_resp;
1455
1456         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1457         if (!disc_resp)
1458                 return -ENOMEM;
1459
1460         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1461         if (!res)
1462                 *pcc = disc_resp->disc.change_count;
1463
1464         kfree(disc_resp);
1465         return res;
1466 }
1467
1468 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1469                                          int phy_id, u8 *attached_sas_addr)
1470 {
1471         int res;
1472         struct smp_resp *disc_resp;
1473         struct discover_resp *dr;
1474
1475         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1476         if (!disc_resp)
1477                 return -ENOMEM;
1478         dr = &disc_resp->disc;
1479
1480         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1481         if (!res) {
1482                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1483                 if (dr->attached_dev_type == 0)
1484                         memset(attached_sas_addr, 0, 8);
1485         }
1486         kfree(disc_resp);
1487         return res;
1488 }
1489
1490 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1491                               int from_phy)
1492 {
1493         struct expander_device *ex = &dev->ex_dev;
1494         int res = 0;
1495         int i;
1496
1497         for (i = from_phy; i < ex->num_phys; i++) {
1498                 int phy_change_count = 0;
1499
1500                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1501                 if (res)
1502                         goto out;
1503                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1504                         ex->ex_phy[i].phy_change_count = phy_change_count;
1505                         *phy_id = i;
1506                         return 0;
1507                 }
1508         }
1509 out:
1510         return res;
1511 }
1512
1513 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1514 {
1515         int res;
1516         u8  *rg_req;
1517         struct smp_resp  *rg_resp;
1518
1519         rg_req = alloc_smp_req(RG_REQ_SIZE);
1520         if (!rg_req)
1521                 return -ENOMEM;
1522
1523         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1524         if (!rg_resp) {
1525                 kfree(rg_req);
1526                 return -ENOMEM;
1527         }
1528
1529         rg_req[1] = SMP_REPORT_GENERAL;
1530
1531         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1532                                RG_RESP_SIZE);
1533         if (res)
1534                 goto out;
1535         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1536                 res = rg_resp->result;
1537                 goto out;
1538         }
1539
1540         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1541 out:
1542         kfree(rg_resp);
1543         kfree(rg_req);
1544         return res;
1545 }
1546
1547 static int sas_find_bcast_dev(struct domain_device *dev,
1548                               struct domain_device **src_dev)
1549 {
1550         struct expander_device *ex = &dev->ex_dev;
1551         int ex_change_count = -1;
1552         int res;
1553
1554         res = sas_get_ex_change_count(dev, &ex_change_count);
1555         if (res)
1556                 goto out;
1557         if (ex_change_count != -1 &&
1558             ex_change_count != ex->ex_change_count) {
1559                 *src_dev = dev;
1560                 ex->ex_change_count = ex_change_count;
1561         } else {
1562                 struct domain_device *ch;
1563
1564                 list_for_each_entry(ch, &ex->children, siblings) {
1565                         if (ch->dev_type == EDGE_DEV ||
1566                             ch->dev_type == FANOUT_DEV) {
1567                                 res = sas_find_bcast_dev(ch, src_dev);
1568                                 if (src_dev)
1569                                         return res;
1570                         }
1571                 }
1572         }
1573 out:
1574         return res;
1575 }
1576
1577 static void sas_unregister_ex_tree(struct domain_device *dev)
1578 {
1579         struct expander_device *ex = &dev->ex_dev;
1580         struct domain_device *child, *n;
1581
1582         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1583                 if (child->dev_type == EDGE_DEV ||
1584                     child->dev_type == FANOUT_DEV)
1585                         sas_unregister_ex_tree(child);
1586                 else
1587                         sas_unregister_dev(child);
1588         }
1589         sas_unregister_dev(dev);
1590 }
1591
1592 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1593                                          int phy_id)
1594 {
1595         struct expander_device *ex_dev = &parent->ex_dev;
1596         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1597         struct domain_device *child, *n;
1598
1599         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1600                 if (SAS_ADDR(child->sas_addr) ==
1601                     SAS_ADDR(phy->attached_sas_addr)) {
1602                         if (child->dev_type == EDGE_DEV ||
1603                             child->dev_type == FANOUT_DEV)
1604                                 sas_unregister_ex_tree(child);
1605                         else
1606                                 sas_unregister_dev(child);
1607                         break;
1608                 }
1609         }
1610         sas_disable_routing(parent, phy->attached_sas_addr);
1611         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1612         sas_port_delete_phy(phy->port, phy->phy);
1613         if (phy->port->num_phys == 0)
1614                 sas_port_delete(phy->port);
1615         phy->port = NULL;
1616 }
1617
1618 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1619                                           const int level)
1620 {
1621         struct expander_device *ex_root = &root->ex_dev;
1622         struct domain_device *child;
1623         int res = 0;
1624
1625         list_for_each_entry(child, &ex_root->children, siblings) {
1626                 if (child->dev_type == EDGE_DEV ||
1627                     child->dev_type == FANOUT_DEV) {
1628                         struct sas_expander_device *ex =
1629                                 rphy_to_expander_device(child->rphy);
1630
1631                         if (level > ex->level)
1632                                 res = sas_discover_bfs_by_root_level(child,
1633                                                                      level);
1634                         else if (level == ex->level)
1635                                 res = sas_ex_discover_devices(child, -1);
1636                 }
1637         }
1638         return res;
1639 }
1640
1641 static int sas_discover_bfs_by_root(struct domain_device *dev)
1642 {
1643         int res;
1644         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1645         int level = ex->level+1;
1646
1647         res = sas_ex_discover_devices(dev, -1);
1648         if (res)
1649                 goto out;
1650         do {
1651                 res = sas_discover_bfs_by_root_level(dev, level);
1652                 mb();
1653                 level += 1;
1654         } while (level <= dev->port->disc.max_level);
1655 out:
1656         return res;
1657 }
1658
1659 static int sas_discover_new(struct domain_device *dev, int phy_id)
1660 {
1661         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1662         struct domain_device *child;
1663         int res;
1664
1665         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1666                     SAS_ADDR(dev->sas_addr), phy_id);
1667         res = sas_ex_phy_discover(dev, phy_id);
1668         if (res)
1669                 goto out;
1670         res = sas_ex_discover_devices(dev, phy_id);
1671         if (res)
1672                 goto out;
1673         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1674                 if (SAS_ADDR(child->sas_addr) ==
1675                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1676                         if (child->dev_type == EDGE_DEV ||
1677                             child->dev_type == FANOUT_DEV)
1678                                 res = sas_discover_bfs_by_root(child);
1679                         break;
1680                 }
1681         }
1682 out:
1683         return res;
1684 }
1685
1686 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1687 {
1688         struct expander_device *ex = &dev->ex_dev;
1689         struct ex_phy *phy = &ex->ex_phy[phy_id];
1690         u8 attached_sas_addr[8];
1691         int res;
1692
1693         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1694         switch (res) {
1695         case SMP_RESP_NO_PHY:
1696                 phy->phy_state = PHY_NOT_PRESENT;
1697                 sas_unregister_devs_sas_addr(dev, phy_id);
1698                 goto out; break;
1699         case SMP_RESP_PHY_VACANT:
1700                 phy->phy_state = PHY_VACANT;
1701                 sas_unregister_devs_sas_addr(dev, phy_id);
1702                 goto out; break;
1703         case SMP_RESP_FUNC_ACC:
1704                 break;
1705         }
1706
1707         if (SAS_ADDR(attached_sas_addr) == 0) {
1708                 phy->phy_state = PHY_EMPTY;
1709                 sas_unregister_devs_sas_addr(dev, phy_id);
1710         } else if (SAS_ADDR(attached_sas_addr) ==
1711                    SAS_ADDR(phy->attached_sas_addr)) {
1712                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1713                             SAS_ADDR(dev->sas_addr), phy_id);
1714                 sas_ex_phy_discover(dev, phy_id);
1715         } else
1716                 res = sas_discover_new(dev, phy_id);
1717 out:
1718         return res;
1719 }
1720
1721 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1722 {
1723         struct expander_device *ex = &dev->ex_dev;
1724         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1725         int res = 0;
1726         int i;
1727
1728         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1729                     SAS_ADDR(dev->sas_addr), phy_id);
1730
1731         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1732                 for (i = 0; i < ex->num_phys; i++) {
1733                         struct ex_phy *phy = &ex->ex_phy[i];
1734
1735                         if (i == phy_id)
1736                                 continue;
1737                         if (SAS_ADDR(phy->attached_sas_addr) ==
1738                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1739                                 SAS_DPRINTK("phy%d part of wide port with "
1740                                             "phy%d\n", phy_id, i);
1741                                 goto out;
1742                         }
1743                 }
1744                 res = sas_rediscover_dev(dev, phy_id);
1745         } else
1746                 res = sas_discover_new(dev, phy_id);
1747 out:
1748         return res;
1749 }
1750
1751 /**
1752  * sas_revalidate_domain -- revalidate the domain
1753  * @port: port to the domain of interest
1754  *
1755  * NOTE: this process _must_ quit (return) as soon as any connection
1756  * errors are encountered.  Connection recovery is done elsewhere.
1757  * Discover process only interrogates devices in order to discover the
1758  * domain.
1759  */
1760 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1761 {
1762         int res;
1763         struct domain_device *dev = NULL;
1764
1765         res = sas_find_bcast_dev(port_dev, &dev);
1766         if (res)
1767                 goto out;
1768         if (dev) {
1769                 struct expander_device *ex = &dev->ex_dev;
1770                 int i = 0, phy_id;
1771
1772                 do {
1773                         phy_id = -1;
1774                         res = sas_find_bcast_phy(dev, &phy_id, i);
1775                         if (phy_id == -1)
1776                                 break;
1777                         res = sas_rediscover(dev, phy_id);
1778                         i = phy_id + 1;
1779                 } while (i < ex->num_phys);
1780         }
1781 out:
1782         return res;
1783 }
1784
1785 #if 0
1786 /* ---------- SMP portal ---------- */
1787
1788 static ssize_t smp_portal_write(struct kobject *kobj, char *buf, loff_t offs,
1789                                 size_t size)
1790 {
1791         struct domain_device *dev = to_dom_device(kobj);
1792         struct expander_device *ex = &dev->ex_dev;
1793
1794         if (offs != 0)
1795                 return -EFBIG;
1796         else if (size == 0)
1797                 return 0;
1798
1799         down_interruptible(&ex->smp_sema);
1800         if (ex->smp_req)
1801                 kfree(ex->smp_req);
1802         ex->smp_req = kzalloc(size, GFP_USER);
1803         if (!ex->smp_req) {
1804                 up(&ex->smp_sema);
1805                 return -ENOMEM;
1806         }
1807         memcpy(ex->smp_req, buf, size);
1808         ex->smp_req_size = size;
1809         ex->smp_portal_pid = current->pid;
1810         up(&ex->smp_sema);
1811
1812         return size;
1813 }
1814
1815 static ssize_t smp_portal_read(struct kobject *kobj, char *buf, loff_t offs,
1816                                size_t size)
1817 {
1818         struct domain_device *dev = to_dom_device(kobj);
1819         struct expander_device *ex = &dev->ex_dev;
1820         u8 *smp_resp;
1821         int res = -EINVAL;
1822
1823         /* XXX: sysfs gives us an offset of 0x10 or 0x8 while in fact
1824          *  it should be 0.
1825          */
1826
1827         down_interruptible(&ex->smp_sema);
1828         if (!ex->smp_req || ex->smp_portal_pid != current->pid)
1829                 goto out;
1830
1831         res = 0;
1832         if (size == 0)
1833                 goto out;
1834
1835         res = -ENOMEM;
1836         smp_resp = alloc_smp_resp(size);
1837         if (!smp_resp)
1838                 goto out;
1839         res = smp_execute_task(dev, ex->smp_req, ex->smp_req_size,
1840                                smp_resp, size);
1841         if (!res) {
1842                 memcpy(buf, smp_resp, size);
1843                 res = size;
1844         }
1845
1846         kfree(smp_resp);
1847 out:
1848         kfree(ex->smp_req);
1849         ex->smp_req = NULL;
1850         ex->smp_req_size = 0;
1851         ex->smp_portal_pid = -1;
1852         up(&ex->smp_sema);
1853         return res;
1854 }
1855 #endif