git.oblomov.eu Git - linux-2.6/blob - 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, retry;
  75         struct sas_task *task = NULL;
  76         struct sas_internal *i =
  77                 to_sas_internal(dev->port->ha->core.shost->transportt);
  78
  79         for (retry = 0; retry < 3; retry++) {
  80                 task = sas_alloc_task(GFP_KERNEL);
  81                 if (!task)
  82                         return -ENOMEM;
  83
  84                 task->dev = dev;
  85                 task->task_proto = dev->tproto;
  86                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  87                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  88
  89                 task->task_done = smp_task_done;
  90
  91                 task->timer.data = (unsigned long) task;
  92                 task->timer.function = smp_task_timedout;
  93                 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  94                 add_timer(&task->timer);
  95
  96                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  97
  98                 if (res) {
  99                         del_timer(&task->timer);
 100                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
 101                         goto ex_err;
 102                 }
 103
 104                 wait_for_completion(&task->completion);
 105                 res = -ETASK;
 106                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 107                         SAS_DPRINTK("smp task timed out or aborted\n");
 108                         i->dft->lldd_abort_task(task);
 109                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 110                                 SAS_DPRINTK("SMP task aborted and not done\n");
 111                                 goto ex_err;
 112                         }
 113                 }
 114                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 115                     task->task_status.stat == SAM_GOOD) {
 116                         res = 0;
 117                         break;
 118                 } else {
 119                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 120                                     "status 0x%x\n", __FUNCTION__,
 121                                     SAS_ADDR(dev->sas_addr),
 122                                     task->task_status.resp,
 123                                     task->task_status.stat);
 124                         sas_free_task(task);
 125                         task = NULL;
 126                 }
 127         }
 128 ex_err:
 129         BUG_ON(retry == 3 && task != NULL);
 130         if (task != NULL) {
 131                 sas_free_task(task);
 132         }
 133         return res;
 134 }
 135
 136 /* ---------- Allocations ---------- */
 137
 138 static inline void *alloc_smp_req(int size)
 139 {
 140         u8 *p = kzalloc(size, GFP_KERNEL);
 141         if (p)
 142                 p[0] = SMP_REQUEST;
 143         return p;
 144 }
 145
 146 static inline void *alloc_smp_resp(int size)
 147 {
 148         return kzalloc(size, GFP_KERNEL);
 149 }
 150
 151 /* ---------- Expander configuration ---------- */
 152
 153 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 154                            void *disc_resp)
 155 {
 156         struct expander_device *ex = &dev->ex_dev;
 157         struct ex_phy *phy = &ex->ex_phy[phy_id];
 158         struct smp_resp *resp = disc_resp;
 159         struct discover_resp *dr = &resp->disc;
 160         struct sas_rphy *rphy = dev->rphy;
 161         int rediscover = (phy->phy != NULL);
 162
 163         if (!rediscover) {
 164                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 165
 166                 /* FIXME: error_handling */
 167                 BUG_ON(!phy->phy);
 168         }
 169
 170         switch (resp->result) {
 171         case SMP_RESP_PHY_VACANT:
 172                 phy->phy_state = PHY_VACANT;
 173                 return;
 174         default:
 175                 phy->phy_state = PHY_NOT_PRESENT;
 176                 return;
 177         case SMP_RESP_FUNC_ACC:
 178                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 179                 break;
 180         }
 181
 182         phy->phy_id = phy_id;
 183         phy->attached_dev_type = dr->attached_dev_type;
 184         phy->linkrate = dr->linkrate;
 185         phy->attached_sata_host = dr->attached_sata_host;
 186         phy->attached_sata_dev  = dr->attached_sata_dev;
 187         phy->attached_sata_ps   = dr->attached_sata_ps;
 188         phy->attached_iproto = dr->iproto << 1;
 189         phy->attached_tproto = dr->tproto << 1;
 190         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 191         phy->attached_phy_id = dr->attached_phy_id;
 192         phy->phy_change_count = dr->change_count;
 193         phy->routing_attr = dr->routing_attr;
 194         phy->virtual = dr->virtual;
 195         phy->last_da_index = -1;
 196
 197         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 198         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 199         phy->phy->identify.phy_identifier = phy_id;
 200         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 201         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 202         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 203         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 204         phy->phy->negotiated_linkrate = phy->linkrate;
 205
 206         if (!rediscover)
 207                 sas_phy_add(phy->phy);
 208
 209         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 210                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 211                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 212                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 213                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 214                     SAS_ADDR(phy->attached_sas_addr));
 215
 216         return;
 217 }
 218
 219 #define DISCOVER_REQ_SIZE  16
 220 #define DISCOVER_RESP_SIZE 56
 221
 222 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 223 {
 224         struct expander_device *ex = &dev->ex_dev;
 225         int  res = 0;
 226         u8   *disc_req;
 227         u8   *disc_resp;
 228
 229         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 230         if (!disc_req)
 231                 return -ENOMEM;
 232
 233         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 234         if (!disc_resp) {
 235                 kfree(disc_req);
 236                 return -ENOMEM;
 237         }
 238
 239         disc_req[1] = SMP_DISCOVER;
 240
 241         if (0 <= single && single < ex->num_phys) {
 242                 disc_req[9] = single;
 243                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 244                                        disc_resp, DISCOVER_RESP_SIZE);
 245                 if (res)
 246                         goto out_err;
 247                 sas_set_ex_phy(dev, single, disc_resp);
 248         } else {
 249                 int i;
 250
 251                 for (i = 0; i < ex->num_phys; i++) {
 252                         disc_req[9] = i;
 253                         res = smp_execute_task(dev, disc_req,
 254                                                DISCOVER_REQ_SIZE, disc_resp,
 255                                                DISCOVER_RESP_SIZE);
 256                         if (res)
 257                                 goto out_err;
 258                         sas_set_ex_phy(dev, i, disc_resp);
 259                 }
 260         }
 261 out_err:
 262         kfree(disc_resp);
 263         kfree(disc_req);
 264         return res;
 265 }
 266
 267 static int sas_expander_discover(struct domain_device *dev)
 268 {
 269         struct expander_device *ex = &dev->ex_dev;
 270         int res = -ENOMEM;
 271
 272         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 273         if (!ex->ex_phy)
 274                 return -ENOMEM;
 275
 276         res = sas_ex_phy_discover(dev, -1);
 277         if (res)
 278                 goto out_err;
 279
 280         return 0;
 281  out_err:
 282         kfree(ex->ex_phy);
 283         ex->ex_phy = NULL;
 284         return res;
 285 }
 286
 287 #define MAX_EXPANDER_PHYS 128
 288
 289 static void ex_assign_report_general(struct domain_device *dev,
 290                                             struct smp_resp *resp)
 291 {
 292         struct report_general_resp *rg = &resp->rg;
 293
 294         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 295         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 296         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 297         dev->ex_dev.conf_route_table = rg->conf_route_table;
 298         dev->ex_dev.configuring = rg->configuring;
 299         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 300 }
 301
 302 #define RG_REQ_SIZE   8
 303 #define RG_RESP_SIZE 32
 304
 305 static int sas_ex_general(struct domain_device *dev)
 306 {
 307         u8 *rg_req;
 308         struct smp_resp *rg_resp;
 309         int res;
 310         int i;
 311
 312         rg_req = alloc_smp_req(RG_REQ_SIZE);
 313         if (!rg_req)
 314                 return -ENOMEM;
 315
 316         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 317         if (!rg_resp) {
 318                 kfree(rg_req);
 319                 return -ENOMEM;
 320         }
 321
 322         rg_req[1] = SMP_REPORT_GENERAL;
 323
 324         for (i = 0; i < 5; i++) {
 325                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 326                                        RG_RESP_SIZE);
 327
 328                 if (res) {
 329                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 330                                     SAS_ADDR(dev->sas_addr), res);
 331                         goto out;
 332                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 333                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 334                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 335                         res = rg_resp->result;
 336                         goto out;
 337                 }
 338
 339                 ex_assign_report_general(dev, rg_resp);
 340
 341                 if (dev->ex_dev.configuring) {
 342                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 343                                     SAS_ADDR(dev->sas_addr));
 344                         schedule_timeout_interruptible(5*HZ);
 345                 } else
 346                         break;
 347         }
 348 out:
 349         kfree(rg_req);
 350         kfree(rg_resp);
 351         return res;
 352 }
 353
 354 static void ex_assign_manuf_info(struct domain_device *dev, void
 355                                         *_mi_resp)
 356 {
 357         u8 *mi_resp = _mi_resp;
 358         struct sas_rphy *rphy = dev->rphy;
 359         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 360
 361         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 362         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 363         memcpy(edev->product_rev, mi_resp + 36,
 364                SAS_EXPANDER_PRODUCT_REV_LEN);
 365
 366         if (mi_resp[8] & 1) {
 367                 memcpy(edev->component_vendor_id, mi_resp + 40,
 368                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 369                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 370                 edev->component_revision_id = mi_resp[50];
 371         }
 372 }
 373
 374 #define MI_REQ_SIZE   8
 375 #define MI_RESP_SIZE 64
 376
 377 static int sas_ex_manuf_info(struct domain_device *dev)
 378 {
 379         u8 *mi_req;
 380         u8 *mi_resp;
 381         int res;
 382
 383         mi_req = alloc_smp_req(MI_REQ_SIZE);
 384         if (!mi_req)
 385                 return -ENOMEM;
 386
 387         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 388         if (!mi_resp) {
 389                 kfree(mi_req);
 390                 return -ENOMEM;
 391         }
 392
 393         mi_req[1] = SMP_REPORT_MANUF_INFO;
 394
 395         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 396         if (res) {
 397                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 398                             SAS_ADDR(dev->sas_addr), res);
 399                 goto out;
 400         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 401                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 402                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 403                 goto out;
 404         }
 405
 406         ex_assign_manuf_info(dev, mi_resp);
 407 out:
 408         kfree(mi_req);
 409         kfree(mi_resp);
 410         return res;
 411 }
 412
 413 #define PC_REQ_SIZE  44
 414 #define PC_RESP_SIZE 8
 415
 416 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 417                         enum phy_func phy_func,
 418                         struct sas_phy_linkrates *rates)
 419 {
 420         u8 *pc_req;
 421         u8 *pc_resp;
 422         int res;
 423
 424         pc_req = alloc_smp_req(PC_REQ_SIZE);
 425         if (!pc_req)
 426                 return -ENOMEM;
 427
 428         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 429         if (!pc_resp) {
 430                 kfree(pc_req);
 431                 return -ENOMEM;
 432         }
 433
 434         pc_req[1] = SMP_PHY_CONTROL;
 435         pc_req[9] = phy_id;
 436         pc_req[10]= phy_func;
 437         if (rates) {
 438                 pc_req[32] = rates->minimum_linkrate << 4;
 439                 pc_req[33] = rates->maximum_linkrate << 4;
 440         }
 441
 442         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 443
 444         kfree(pc_resp);
 445         kfree(pc_req);
 446         return res;
 447 }
 448
 449 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 450 {
 451         struct expander_device *ex = &dev->ex_dev;
 452         struct ex_phy *phy = &ex->ex_phy[phy_id];
 453
 454         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 455         phy->linkrate = SAS_PHY_DISABLED;
 456 }
 457
 458 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 459 {
 460         struct expander_device *ex = &dev->ex_dev;
 461         int i;
 462
 463         for (i = 0; i < ex->num_phys; i++) {
 464                 struct ex_phy *phy = &ex->ex_phy[i];
 465
 466                 if (phy->phy_state == PHY_VACANT ||
 467                     phy->phy_state == PHY_NOT_PRESENT)
 468                         continue;
 469
 470                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 471                         sas_ex_disable_phy(dev, i);
 472         }
 473 }
 474
 475 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 476                                             u8 *sas_addr)
 477 {
 478         struct domain_device *dev;
 479
 480         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 481                 return 1;
 482         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 483                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 484                         return 1;
 485         }
 486         return 0;
 487 }
 488
 489 #define RPEL_REQ_SIZE   16
 490 #define RPEL_RESP_SIZE  32
 491 int sas_smp_get_phy_events(struct sas_phy *phy)
 492 {
 493         int res;
 494         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 495         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 496         u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
 497         u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
 498
 499         if (!resp)
 500                 return -ENOMEM;
 501
 502         req[1] = SMP_REPORT_PHY_ERR_LOG;
 503         req[9] = phy->number;
 504
 505         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 506                                     resp, RPEL_RESP_SIZE);
 507
 508         if (!res)
 509                 goto out;
 510
 511         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 512         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 513         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 514         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 515
 516  out:
 517         kfree(resp);
 518         return res;
 519
 520 }
 521
 522 #define RPS_REQ_SIZE  16
 523 #define RPS_RESP_SIZE 60
 524
 525 static int sas_get_report_phy_sata(struct domain_device *dev,
 526                                           int phy_id,
 527                                           struct smp_resp *rps_resp)
 528 {
 529         int res;
 530         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 531
 532         if (!rps_req)
 533                 return -ENOMEM;
 534
 535         rps_req[1] = SMP_REPORT_PHY_SATA;
 536         rps_req[9] = phy_id;
 537
 538         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 539                                     rps_resp, RPS_RESP_SIZE);
 540
 541         kfree(rps_req);
 542         return 0;
 543 }
 544
 545 static void sas_ex_get_linkrate(struct domain_device *parent,
 546                                        struct domain_device *child,
 547                                        struct ex_phy *parent_phy)
 548 {
 549         struct expander_device *parent_ex = &parent->ex_dev;
 550         struct sas_port *port;
 551         int i;
 552
 553         child->pathways = 0;
 554
 555         port = parent_phy->port;
 556
 557         for (i = 0; i < parent_ex->num_phys; i++) {
 558                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 559
 560                 if (phy->phy_state == PHY_VACANT ||
 561                     phy->phy_state == PHY_NOT_PRESENT)
 562                         continue;
 563
 564                 if (SAS_ADDR(phy->attached_sas_addr) ==
 565                     SAS_ADDR(child->sas_addr)) {
 566
 567                         child->min_linkrate = min(parent->min_linkrate,
 568                                                   phy->linkrate);
 569                         child->max_linkrate = max(parent->max_linkrate,
 570                                                   phy->linkrate);
 571                         child->pathways++;
 572                         sas_port_add_phy(port, phy->phy);
 573                 }
 574         }
 575         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 576         child->pathways = min(child->pathways, parent->pathways);
 577 }
 578
 579 static struct domain_device *sas_ex_discover_end_dev(
 580         struct domain_device *parent, int phy_id)
 581 {
 582         struct expander_device *parent_ex = &parent->ex_dev;
 583         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 584         struct domain_device *child = NULL;
 585         struct sas_rphy *rphy;
 586         int res;
 587
 588         if (phy->attached_sata_host || phy->attached_sata_ps)
 589                 return NULL;
 590
 591         child = kzalloc(sizeof(*child), GFP_KERNEL);
 592         if (!child)
 593                 return NULL;
 594
 595         child->parent = parent;
 596         child->port   = parent->port;
 597         child->iproto = phy->attached_iproto;
 598         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 599         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 600         if (!phy->port) {
 601                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 602                 if (unlikely(!phy->port))
 603                         goto out_err;
 604                 if (unlikely(sas_port_add(phy->port) != 0)) {
 605                         sas_port_free(phy->port);
 606                         goto out_err;
 607                 }
 608         }
 609         sas_ex_get_linkrate(parent, child, phy);
 610
 611         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 612                 child->dev_type = SATA_DEV;
 613                 if (phy->attached_tproto & SAS_PROTO_STP)
 614                         child->tproto = phy->attached_tproto;
 615                 if (phy->attached_sata_dev)
 616                         child->tproto |= SATA_DEV;
 617                 res = sas_get_report_phy_sata(parent, phy_id,
 618                                               &child->sata_dev.rps_resp);
 619                 if (res) {
 620                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 621                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 622                                     phy_id, res);
 623                         goto out_free;
 624                 }
 625                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 626                        sizeof(struct dev_to_host_fis));
 627                 sas_init_dev(child);
 628                 res = sas_discover_sata(child);
 629                 if (res) {
 630                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 631                                     "%016llx:0x%x returned 0x%x\n",
 632                                     SAS_ADDR(child->sas_addr),
 633                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 634                         goto out_free;
 635                 }
 636         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 637                 child->dev_type = SAS_END_DEV;
 638                 rphy = sas_end_device_alloc(phy->port);
 639                 /* FIXME: error handling */
 640                 if (unlikely(!rphy))
 641                         goto out_free;
 642                 child->tproto = phy->attached_tproto;
 643                 sas_init_dev(child);
 644
 645                 child->rphy = rphy;
 646                 sas_fill_in_rphy(child, rphy);
 647
 648                 spin_lock(&parent->port->dev_list_lock);
 649                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 650                 spin_unlock(&parent->port->dev_list_lock);
 651
 652                 res = sas_discover_end_dev(child);
 653                 if (res) {
 654                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 655                                     "at %016llx:0x%x returned 0x%x\n",
 656                                     SAS_ADDR(child->sas_addr),
 657                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 658                         goto out_list_del;
 659                 }
 660         } else {
 661                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 662                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 663                             phy_id);
 664         }
 665
 666         list_add_tail(&child->siblings, &parent_ex->children);
 667         return child;
 668
 669  out_list_del:
 670         list_del(&child->dev_list_node);
 671  out_free:
 672         sas_port_delete(phy->port);
 673  out_err:
 674         phy->port = NULL;
 675         kfree(child);
 676         return NULL;
 677 }
 678
 679 static struct domain_device *sas_ex_discover_expander(
 680         struct domain_device *parent, int phy_id)
 681 {
 682         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 683         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 684         struct domain_device *child = NULL;
 685         struct sas_rphy *rphy;
 686         struct sas_expander_device *edev;
 687         struct asd_sas_port *port;
 688         int res;
 689
 690         if (phy->routing_attr == DIRECT_ROUTING) {
 691                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 692                             "allowed\n",
 693                             SAS_ADDR(parent->sas_addr), phy_id,
 694                             SAS_ADDR(phy->attached_sas_addr),
 695                             phy->attached_phy_id);
 696                 return NULL;
 697         }
 698         child = kzalloc(sizeof(*child), GFP_KERNEL);
 699         if (!child)
 700                 return NULL;
 701
 702         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 703         /* FIXME: better error handling */
 704         BUG_ON(sas_port_add(phy->port) != 0);
 705
 706
 707         switch (phy->attached_dev_type) {
 708         case EDGE_DEV:
 709                 rphy = sas_expander_alloc(phy->port,
 710                                           SAS_EDGE_EXPANDER_DEVICE);
 711                 break;
 712         case FANOUT_DEV:
 713                 rphy = sas_expander_alloc(phy->port,
 714                                           SAS_FANOUT_EXPANDER_DEVICE);
 715                 break;
 716         default:
 717                 rphy = NULL;    /* shut gcc up */
 718                 BUG();
 719         }
 720         port = parent->port;
 721         child->rphy = rphy;
 722         edev = rphy_to_expander_device(rphy);
 723         child->dev_type = phy->attached_dev_type;
 724         child->parent = parent;
 725         child->port = port;
 726         child->iproto = phy->attached_iproto;
 727         child->tproto = phy->attached_tproto;
 728         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 729         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 730         sas_ex_get_linkrate(parent, child, phy);
 731         edev->level = parent_ex->level + 1;
 732         parent->port->disc.max_level = max(parent->port->disc.max_level,
 733                                            edev->level);
 734         sas_init_dev(child);
 735         sas_fill_in_rphy(child, rphy);
 736         sas_rphy_add(rphy);
 737
 738         spin_lock(&parent->port->dev_list_lock);
 739         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 740         spin_unlock(&parent->port->dev_list_lock);
 741
 742         res = sas_discover_expander(child);
 743         if (res) {
 744                 kfree(child);
 745                 return NULL;
 746         }
 747         list_add_tail(&child->siblings, &parent->ex_dev.children);
 748         return child;
 749 }
 750
 751 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 752 {
 753         struct expander_device *ex = &dev->ex_dev;
 754         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 755         struct domain_device *child = NULL;
 756         int res = 0;
 757
 758         /* Phy state */
 759         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 760                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 761                         res = sas_ex_phy_discover(dev, phy_id);
 762                 if (res)
 763                         return res;
 764         }
 765
 766         /* Parent and domain coherency */
 767         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 768                              SAS_ADDR(dev->port->sas_addr))) {
 769                 sas_add_parent_port(dev, phy_id);
 770                 return 0;
 771         }
 772         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 773                             SAS_ADDR(dev->parent->sas_addr))) {
 774                 sas_add_parent_port(dev, phy_id);
 775                 if (ex_phy->routing_attr == TABLE_ROUTING)
 776                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 777                 return 0;
 778         }
 779
 780         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 781                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 782
 783         if (ex_phy->attached_dev_type == NO_DEVICE) {
 784                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 785                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 786                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 787                 }
 788                 return 0;
 789         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 790                 return 0;
 791
 792         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 793             ex_phy->attached_dev_type != FANOUT_DEV &&
 794             ex_phy->attached_dev_type != EDGE_DEV) {
 795                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 796                             "phy 0x%x\n", ex_phy->attached_dev_type,
 797                             SAS_ADDR(dev->sas_addr),
 798                             phy_id);
 799                 return 0;
 800         }
 801
 802         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 803         if (res) {
 804                 SAS_DPRINTK("configure routing for dev %016llx "
 805                             "reported 0x%x. Forgotten\n",
 806                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 807                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 808                 return res;
 809         }
 810
 811         switch (ex_phy->attached_dev_type) {
 812         case SAS_END_DEV:
 813                 child = sas_ex_discover_end_dev(dev, phy_id);
 814                 break;
 815         case FANOUT_DEV:
 816                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 817                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 818                                     "attached to ex %016llx phy 0x%x\n",
 819                                     SAS_ADDR(ex_phy->attached_sas_addr),
 820                                     ex_phy->attached_phy_id,
 821                                     SAS_ADDR(dev->sas_addr),
 822                                     phy_id);
 823                         sas_ex_disable_phy(dev, phy_id);
 824                         break;
 825                 } else
 826                         memcpy(dev->port->disc.fanout_sas_addr,
 827                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 828                 /* fallthrough */
 829         case EDGE_DEV:
 830                 child = sas_ex_discover_expander(dev, phy_id);
 831                 break;
 832         default:
 833                 break;
 834         }
 835
 836         if (child) {
 837                 int i;
 838
 839                 for (i = 0; i < ex->num_phys; i++) {
 840                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 841                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 842                                 continue;
 843
 844                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 845                             SAS_ADDR(child->sas_addr))
 846                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 847                 }
 848         }
 849
 850         return res;
 851 }
 852
 853 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 854 {
 855         struct expander_device *ex = &dev->ex_dev;
 856         int i;
 857
 858         for (i = 0; i < ex->num_phys; i++) {
 859                 struct ex_phy *phy = &ex->ex_phy[i];
 860
 861                 if (phy->phy_state == PHY_VACANT ||
 862                     phy->phy_state == PHY_NOT_PRESENT)
 863                         continue;
 864
 865                 if ((phy->attached_dev_type == EDGE_DEV ||
 866                      phy->attached_dev_type == FANOUT_DEV) &&
 867                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 868
 869                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 870
 871                         return 1;
 872                 }
 873         }
 874         return 0;
 875 }
 876
 877 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 878 {
 879         struct expander_device *ex = &dev->ex_dev;
 880         struct domain_device *child;
 881         u8 sub_addr[8] = {0, };
 882
 883         list_for_each_entry(child, &ex->children, siblings) {
 884                 if (child->dev_type != EDGE_DEV &&
 885                     child->dev_type != FANOUT_DEV)
 886                         continue;
 887                 if (sub_addr[0] == 0) {
 888                         sas_find_sub_addr(child, sub_addr);
 889                         continue;
 890                 } else {
 891                         u8 s2[8];
 892
 893                         if (sas_find_sub_addr(child, s2) &&
 894                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 895
 896                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 897                                             "diverges from subtractive "
 898                                             "boundary %016llx\n",
 899                                             SAS_ADDR(dev->sas_addr),
 900                                             SAS_ADDR(child->sas_addr),
 901                                             SAS_ADDR(s2),
 902                                             SAS_ADDR(sub_addr));
 903
 904                                 sas_ex_disable_port(child, s2);
 905                         }
 906                 }
 907         }
 908         return 0;
 909 }
 910 /**
 911  * sas_ex_discover_devices -- discover devices attached to this expander
 912  * dev: pointer to the expander domain device
 913  * single: if you want to do a single phy, else set to -1;
 914  *
 915  * Configure this expander for use with its devices and register the
 916  * devices of this expander.
 917  */
 918 static int sas_ex_discover_devices(struct domain_device *dev, int single)
 919 {
 920         struct expander_device *ex = &dev->ex_dev;
 921         int i = 0, end = ex->num_phys;
 922         int res = 0;
 923
 924         if (0 <= single && single < end) {
 925                 i = single;
 926                 end = i+1;
 927         }
 928
 929         for ( ; i < end; i++) {
 930                 struct ex_phy *ex_phy = &ex->ex_phy[i];
 931
 932                 if (ex_phy->phy_state == PHY_VACANT ||
 933                     ex_phy->phy_state == PHY_NOT_PRESENT ||
 934                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
 935                         continue;
 936
 937                 switch (ex_phy->linkrate) {
 938                 case SAS_PHY_DISABLED:
 939                 case SAS_PHY_RESET_PROBLEM:
 940                 case SAS_SATA_PORT_SELECTOR:
 941                         continue;
 942                 default:
 943                         res = sas_ex_discover_dev(dev, i);
 944                         if (res)
 945                                 break;
 946                         continue;
 947                 }
 948         }
 949
 950         if (!res)
 951                 sas_check_level_subtractive_boundary(dev);
 952
 953         return res;
 954 }
 955
 956 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
 957 {
 958         struct expander_device *ex = &dev->ex_dev;
 959         int i;
 960         u8  *sub_sas_addr = NULL;
 961
 962         if (dev->dev_type != EDGE_DEV)
 963                 return 0;
 964
 965         for (i = 0; i < ex->num_phys; i++) {
 966                 struct ex_phy *phy = &ex->ex_phy[i];
 967
 968                 if (phy->phy_state == PHY_VACANT ||
 969                     phy->phy_state == PHY_NOT_PRESENT)
 970                         continue;
 971
 972                 if ((phy->attached_dev_type == FANOUT_DEV ||
 973                      phy->attached_dev_type == EDGE_DEV) &&
 974                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 975
 976                         if (!sub_sas_addr)
 977                                 sub_sas_addr = &phy->attached_sas_addr[0];
 978                         else if (SAS_ADDR(sub_sas_addr) !=
 979                                  SAS_ADDR(phy->attached_sas_addr)) {
 980
 981                                 SAS_DPRINTK("ex %016llx phy 0x%x "
 982                                             "diverges(%016llx) on subtractive "
 983                                             "boundary(%016llx). Disabled\n",
 984                                             SAS_ADDR(dev->sas_addr), i,
 985                                             SAS_ADDR(phy->attached_sas_addr),
 986                                             SAS_ADDR(sub_sas_addr));
 987                                 sas_ex_disable_phy(dev, i);
 988                         }
 989                 }
 990         }
 991         return 0;
 992 }
 993
 994 static void sas_print_parent_topology_bug(struct domain_device *child,
 995                                                  struct ex_phy *parent_phy,
 996                                                  struct ex_phy *child_phy)
 997 {
 998         static const char ra_char[] = {
 999                 [DIRECT_ROUTING] = 'D',
1000                 [SUBTRACTIVE_ROUTING] = 'S',
1001                 [TABLE_ROUTING] = 'T',
1002         };
1003         static const char *ex_type[] = {
1004                 [EDGE_DEV] = "edge",
1005                 [FANOUT_DEV] = "fanout",
1006         };
1007         struct domain_device *parent = child->parent;
1008
1009         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1010                    "has %c:%c routing link!\n",
1011
1012                    ex_type[parent->dev_type],
1013                    SAS_ADDR(parent->sas_addr),
1014                    parent_phy->phy_id,
1015
1016                    ex_type[child->dev_type],
1017                    SAS_ADDR(child->sas_addr),
1018                    child_phy->phy_id,
1019
1020                    ra_char[parent_phy->routing_attr],
1021                    ra_char[child_phy->routing_attr]);
1022 }
1023
1024 static int sas_check_eeds(struct domain_device *child,
1025                                  struct ex_phy *parent_phy,
1026                                  struct ex_phy *child_phy)
1027 {
1028         int res = 0;
1029         struct domain_device *parent = child->parent;
1030
1031         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1032                 res = -ENODEV;
1033                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1034                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1035                             SAS_ADDR(parent->sas_addr),
1036                             parent_phy->phy_id,
1037                             SAS_ADDR(child->sas_addr),
1038                             child_phy->phy_id,
1039                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1040         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1041                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1042                        SAS_ADDR_SIZE);
1043                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1044                        SAS_ADDR_SIZE);
1045         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1046                     SAS_ADDR(parent->sas_addr)) ||
1047                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1048                     SAS_ADDR(child->sas_addr)))
1049                    &&
1050                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1051                      SAS_ADDR(parent->sas_addr)) ||
1052                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1053                      SAS_ADDR(child->sas_addr))))
1054                 ;
1055         else {
1056                 res = -ENODEV;
1057                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1058                             "phy 0x%x link forms a third EEDS!\n",
1059                             SAS_ADDR(parent->sas_addr),
1060                             parent_phy->phy_id,
1061                             SAS_ADDR(child->sas_addr),
1062                             child_phy->phy_id);
1063         }
1064
1065         return res;
1066 }
1067
1068 /* Here we spill over 80 columns.  It is intentional.
1069  */
1070 static int sas_check_parent_topology(struct domain_device *child)
1071 {
1072         struct expander_device *child_ex = &child->ex_dev;
1073         struct expander_device *parent_ex;
1074         int i;
1075         int res = 0;
1076
1077         if (!child->parent)
1078                 return 0;
1079
1080         if (child->parent->dev_type != EDGE_DEV &&
1081             child->parent->dev_type != FANOUT_DEV)
1082                 return 0;
1083
1084         parent_ex = &child->parent->ex_dev;
1085
1086         for (i = 0; i < parent_ex->num_phys; i++) {
1087                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1088                 struct ex_phy *child_phy;
1089
1090                 if (parent_phy->phy_state == PHY_VACANT ||
1091                     parent_phy->phy_state == PHY_NOT_PRESENT)
1092                         continue;
1093
1094                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1095                         continue;
1096
1097                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1098
1099                 switch (child->parent->dev_type) {
1100                 case EDGE_DEV:
1101                         if (child->dev_type == FANOUT_DEV) {
1102                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1103                                     child_phy->routing_attr != TABLE_ROUTING) {
1104                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1105                                         res = -ENODEV;
1106                                 }
1107                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1108                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1109                                         res = sas_check_eeds(child, parent_phy, child_phy);
1110                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1111                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1112                                         res = -ENODEV;
1113                                 }
1114                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1115                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1116                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1117                                 res = -ENODEV;
1118                         }
1119                         break;
1120                 case FANOUT_DEV:
1121                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1122                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1123                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1124                                 res = -ENODEV;
1125                         }
1126                         break;
1127                 default:
1128                         break;
1129                 }
1130         }
1131
1132         return res;
1133 }
1134
1135 #define RRI_REQ_SIZE  16
1136 #define RRI_RESP_SIZE 44
1137
1138 static int sas_configure_present(struct domain_device *dev, int phy_id,
1139                                  u8 *sas_addr, int *index, int *present)
1140 {
1141         int i, res = 0;
1142         struct expander_device *ex = &dev->ex_dev;
1143         struct ex_phy *phy = &ex->ex_phy[phy_id];
1144         u8 *rri_req;
1145         u8 *rri_resp;
1146
1147         *present = 0;
1148         *index = 0;
1149
1150         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1151         if (!rri_req)
1152                 return -ENOMEM;
1153
1154         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1155         if (!rri_resp) {
1156                 kfree(rri_req);
1157                 return -ENOMEM;
1158         }
1159
1160         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1161         rri_req[9] = phy_id;
1162
1163         for (i = 0; i < ex->max_route_indexes ; i++) {
1164                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1165                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1166                                        RRI_RESP_SIZE);
1167                 if (res)
1168                         goto out;
1169                 res = rri_resp[2];
1170                 if (res == SMP_RESP_NO_INDEX) {
1171                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1172                                     "phy 0x%x index 0x%x\n",
1173                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1174                         goto out;
1175                 } else if (res != SMP_RESP_FUNC_ACC) {
1176                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1177                                     "result 0x%x\n", __FUNCTION__,
1178                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1179                         goto out;
1180                 }
1181                 if (SAS_ADDR(sas_addr) != 0) {
1182                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1183                                 *index = i;
1184                                 if ((rri_resp[12] & 0x80) == 0x80)
1185                                         *present = 0;
1186                                 else
1187                                         *present = 1;
1188                                 goto out;
1189                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1190                                 *index = i;
1191                                 *present = 0;
1192                                 goto out;
1193                         }
1194                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1195                            phy->last_da_index < i) {
1196                         phy->last_da_index = i;
1197                         *index = i;
1198                         *present = 0;
1199                         goto out;
1200                 }
1201         }
1202         res = -1;
1203 out:
1204         kfree(rri_req);
1205         kfree(rri_resp);
1206         return res;
1207 }
1208
1209 #define CRI_REQ_SIZE  44
1210 #define CRI_RESP_SIZE  8
1211
1212 static int sas_configure_set(struct domain_device *dev, int phy_id,
1213                              u8 *sas_addr, int index, int include)
1214 {
1215         int res;
1216         u8 *cri_req;
1217         u8 *cri_resp;
1218
1219         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1220         if (!cri_req)
1221                 return -ENOMEM;
1222
1223         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1224         if (!cri_resp) {
1225                 kfree(cri_req);
1226                 return -ENOMEM;
1227         }
1228
1229         cri_req[1] = SMP_CONF_ROUTE_INFO;
1230         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1231         cri_req[9] = phy_id;
1232         if (SAS_ADDR(sas_addr) == 0 || !include)
1233                 cri_req[12] |= 0x80;
1234         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1235
1236         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1237                                CRI_RESP_SIZE);
1238         if (res)
1239                 goto out;
1240         res = cri_resp[2];
1241         if (res == SMP_RESP_NO_INDEX) {
1242                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1243                             "index 0x%x\n",
1244                             SAS_ADDR(dev->sas_addr), phy_id, index);
1245         }
1246 out:
1247         kfree(cri_req);
1248         kfree(cri_resp);
1249         return res;
1250 }
1251
1252 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1253                                     u8 *sas_addr, int include)
1254 {
1255         int index;
1256         int present;
1257         int res;
1258
1259         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1260         if (res)
1261                 return res;
1262         if (include ^ present)
1263                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1264
1265         return res;
1266 }
1267
1268 /**
1269  * sas_configure_parent -- configure routing table of parent
1270  * parent: parent expander
1271  * child: child expander
1272  * sas_addr: SAS port identifier of device directly attached to child
1273  */
1274 static int sas_configure_parent(struct domain_device *parent,
1275                                 struct domain_device *child,
1276                                 u8 *sas_addr, int include)
1277 {
1278         struct expander_device *ex_parent = &parent->ex_dev;
1279         int res = 0;
1280         int i;
1281
1282         if (parent->parent) {
1283                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1284                                            include);
1285                 if (res)
1286                         return res;
1287         }
1288
1289         if (ex_parent->conf_route_table == 0) {
1290                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1291                             SAS_ADDR(parent->sas_addr));
1292                 return 0;
1293         }
1294
1295         for (i = 0; i < ex_parent->num_phys; i++) {
1296                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1297
1298                 if ((phy->routing_attr == TABLE_ROUTING) &&
1299                     (SAS_ADDR(phy->attached_sas_addr) ==
1300                      SAS_ADDR(child->sas_addr))) {
1301                         res = sas_configure_phy(parent, i, sas_addr, include);
1302                         if (res)
1303                                 return res;
1304                 }
1305         }
1306
1307         return res;
1308 }
1309
1310 /**
1311  * sas_configure_routing -- configure routing
1312  * dev: expander device
1313  * sas_addr: port identifier of device directly attached to the expander device
1314  */
1315 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1316 {
1317         if (dev->parent)
1318                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1319         return 0;
1320 }
1321
1322 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1323 {
1324         if (dev->parent)
1325                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1326         return 0;
1327 }
1328
1329 #if 0
1330 #define SMP_BIN_ATTR_NAME "smp_portal"
1331
1332 static void sas_ex_smp_hook(struct domain_device *dev)
1333 {
1334         struct expander_device *ex_dev = &dev->ex_dev;
1335         struct bin_attribute *bin_attr = &ex_dev->smp_bin_attr;
1336
1337         memset(bin_attr, 0, sizeof(*bin_attr));
1338
1339         bin_attr->attr.name = SMP_BIN_ATTR_NAME;
1340         bin_attr->attr.owner = THIS_MODULE;
1341         bin_attr->attr.mode = 0600;
1342
1343         bin_attr->size = 0;
1344         bin_attr->private = NULL;
1345         bin_attr->read = smp_portal_read;
1346         bin_attr->write= smp_portal_write;
1347         bin_attr->mmap = NULL;
1348
1349         ex_dev->smp_portal_pid = -1;
1350         init_MUTEX(&ex_dev->smp_sema);
1351 }
1352 #endif
1353
1354 /**
1355  * sas_discover_expander -- expander discovery
1356  * @ex: pointer to expander domain device
1357  *
1358  * See comment in sas_discover_sata().
1359  */
1360 static int sas_discover_expander(struct domain_device *dev)
1361 {
1362         int res;
1363
1364         res = sas_notify_lldd_dev_found(dev);
1365         if (res)
1366                 return res;
1367
1368         res = sas_ex_general(dev);
1369         if (res)
1370                 goto out_err;
1371         res = sas_ex_manuf_info(dev);
1372         if (res)
1373                 goto out_err;
1374
1375         res = sas_expander_discover(dev);
1376         if (res) {
1377                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1378                             SAS_ADDR(dev->sas_addr), res);
1379                 goto out_err;
1380         }
1381
1382         sas_check_ex_subtractive_boundary(dev);
1383         res = sas_check_parent_topology(dev);
1384         if (res)
1385                 goto out_err;
1386         return 0;
1387 out_err:
1388         sas_notify_lldd_dev_gone(dev);
1389         return res;
1390 }
1391
1392 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1393 {
1394         int res = 0;
1395         struct domain_device *dev;
1396
1397         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1398                 if (dev->dev_type == EDGE_DEV ||
1399                     dev->dev_type == FANOUT_DEV) {
1400                         struct sas_expander_device *ex =
1401                                 rphy_to_expander_device(dev->rphy);
1402
1403                         if (level == ex->level)
1404                                 res = sas_ex_discover_devices(dev, -1);
1405                         else if (level > 0)
1406                                 res = sas_ex_discover_devices(port->port_dev, -1);
1407
1408                 }
1409         }
1410
1411         return res;
1412 }
1413
1414 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1415 {
1416         int res;
1417         int level;
1418
1419         do {
1420                 level = port->disc.max_level;
1421                 res = sas_ex_level_discovery(port, level);
1422                 mb();
1423         } while (level < port->disc.max_level);
1424
1425         return res;
1426 }
1427
1428 int sas_discover_root_expander(struct domain_device *dev)
1429 {
1430         int res;
1431         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1432
1433         res = sas_rphy_add(dev->rphy);
1434         if (res)
1435                 goto out_err;
1436
1437         ex->level = dev->port->disc.max_level; /* 0 */
1438         res = sas_discover_expander(dev);
1439         if (res)
1440                 goto out_err2;
1441
1442         sas_ex_bfs_disc(dev->port);
1443
1444         return res;
1445
1446 out_err2:
1447         sas_rphy_delete(dev->rphy);
1448         dev->rphy = NULL;
1449         return res;
1450 out_err:
1451         sas_rphy_free(dev->rphy);
1452         dev->rphy = NULL;
1453         return res;
1454 }
1455
1456 /* ---------- Domain revalidation ---------- */
1457
1458 static int sas_get_phy_discover(struct domain_device *dev,
1459                                 int phy_id, struct smp_resp *disc_resp)
1460 {
1461         int res;
1462         u8 *disc_req;
1463
1464         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1465         if (!disc_req)
1466                 return -ENOMEM;
1467
1468         disc_req[1] = SMP_DISCOVER;
1469         disc_req[9] = phy_id;
1470
1471         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1472                                disc_resp, DISCOVER_RESP_SIZE);
1473         if (res)
1474                 goto out;
1475         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1476                 res = disc_resp->result;
1477                 goto out;
1478         }
1479 out:
1480         kfree(disc_req);
1481         return res;
1482 }
1483
1484 static int sas_get_phy_change_count(struct domain_device *dev,
1485                                     int phy_id, int *pcc)
1486 {
1487         int res;
1488         struct smp_resp *disc_resp;
1489
1490         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1491         if (!disc_resp)
1492                 return -ENOMEM;
1493
1494         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1495         if (!res)
1496                 *pcc = disc_resp->disc.change_count;
1497
1498         kfree(disc_resp);
1499         return res;
1500 }
1501
1502 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1503                                          int phy_id, u8 *attached_sas_addr)
1504 {
1505         int res;
1506         struct smp_resp *disc_resp;
1507         struct discover_resp *dr;
1508
1509         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1510         if (!disc_resp)
1511                 return -ENOMEM;
1512         dr = &disc_resp->disc;
1513
1514         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1515         if (!res) {
1516                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1517                 if (dr->attached_dev_type == 0)
1518                         memset(attached_sas_addr, 0, 8);
1519         }
1520         kfree(disc_resp);
1521         return res;
1522 }
1523
1524 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1525                               int from_phy)
1526 {
1527         struct expander_device *ex = &dev->ex_dev;
1528         int res = 0;
1529         int i;
1530
1531         for (i = from_phy; i < ex->num_phys; i++) {
1532                 int phy_change_count = 0;
1533
1534                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1535                 if (res)
1536                         goto out;
1537                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1538                         ex->ex_phy[i].phy_change_count = phy_change_count;
1539                         *phy_id = i;
1540                         return 0;
1541                 }
1542         }
1543 out:
1544         return res;
1545 }
1546
1547 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1548 {
1549         int res;
1550         u8  *rg_req;
1551         struct smp_resp  *rg_resp;
1552
1553         rg_req = alloc_smp_req(RG_REQ_SIZE);
1554         if (!rg_req)
1555                 return -ENOMEM;
1556
1557         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1558         if (!rg_resp) {
1559                 kfree(rg_req);
1560                 return -ENOMEM;
1561         }
1562
1563         rg_req[1] = SMP_REPORT_GENERAL;
1564
1565         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1566                                RG_RESP_SIZE);
1567         if (res)
1568                 goto out;
1569         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1570                 res = rg_resp->result;
1571                 goto out;
1572         }
1573
1574         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1575 out:
1576         kfree(rg_resp);
1577         kfree(rg_req);
1578         return res;
1579 }
1580
1581 static int sas_find_bcast_dev(struct domain_device *dev,
1582                               struct domain_device **src_dev)
1583 {
1584         struct expander_device *ex = &dev->ex_dev;
1585         int ex_change_count = -1;
1586         int res;
1587
1588         res = sas_get_ex_change_count(dev, &ex_change_count);
1589         if (res)
1590                 goto out;
1591         if (ex_change_count != -1 &&
1592             ex_change_count != ex->ex_change_count) {
1593                 *src_dev = dev;
1594                 ex->ex_change_count = ex_change_count;
1595         } else {
1596                 struct domain_device *ch;
1597
1598                 list_for_each_entry(ch, &ex->children, siblings) {
1599                         if (ch->dev_type == EDGE_DEV ||
1600                             ch->dev_type == FANOUT_DEV) {
1601                                 res = sas_find_bcast_dev(ch, src_dev);
1602                                 if (src_dev)
1603                                         return res;
1604                         }
1605                 }
1606         }
1607 out:
1608         return res;
1609 }
1610
1611 static void sas_unregister_ex_tree(struct domain_device *dev)
1612 {
1613         struct expander_device *ex = &dev->ex_dev;
1614         struct domain_device *child, *n;
1615
1616         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1617                 if (child->dev_type == EDGE_DEV ||
1618                     child->dev_type == FANOUT_DEV)
1619                         sas_unregister_ex_tree(child);
1620                 else
1621                         sas_unregister_dev(child);
1622         }
1623         sas_unregister_dev(dev);
1624 }
1625
1626 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1627                                          int phy_id)
1628 {
1629         struct expander_device *ex_dev = &parent->ex_dev;
1630         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1631         struct domain_device *child, *n;
1632
1633         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1634                 if (SAS_ADDR(child->sas_addr) ==
1635                     SAS_ADDR(phy->attached_sas_addr)) {
1636                         if (child->dev_type == EDGE_DEV ||
1637                             child->dev_type == FANOUT_DEV)
1638                                 sas_unregister_ex_tree(child);
1639                         else
1640                                 sas_unregister_dev(child);
1641                         break;
1642                 }
1643         }
1644         sas_disable_routing(parent, phy->attached_sas_addr);
1645         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1646         sas_port_delete_phy(phy->port, phy->phy);
1647         if (phy->port->num_phys == 0)
1648                 sas_port_delete(phy->port);
1649         phy->port = NULL;
1650 }
1651
1652 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1653                                           const int level)
1654 {
1655         struct expander_device *ex_root = &root->ex_dev;
1656         struct domain_device *child;
1657         int res = 0;
1658
1659         list_for_each_entry(child, &ex_root->children, siblings) {
1660                 if (child->dev_type == EDGE_DEV ||
1661                     child->dev_type == FANOUT_DEV) {
1662                         struct sas_expander_device *ex =
1663                                 rphy_to_expander_device(child->rphy);
1664
1665                         if (level > ex->level)
1666                                 res = sas_discover_bfs_by_root_level(child,
1667                                                                      level);
1668                         else if (level == ex->level)
1669                                 res = sas_ex_discover_devices(child, -1);
1670                 }
1671         }
1672         return res;
1673 }
1674
1675 static int sas_discover_bfs_by_root(struct domain_device *dev)
1676 {
1677         int res;
1678         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1679         int level = ex->level+1;
1680
1681         res = sas_ex_discover_devices(dev, -1);
1682         if (res)
1683                 goto out;
1684         do {
1685                 res = sas_discover_bfs_by_root_level(dev, level);
1686                 mb();
1687                 level += 1;
1688         } while (level <= dev->port->disc.max_level);
1689 out:
1690         return res;
1691 }
1692
1693 static int sas_discover_new(struct domain_device *dev, int phy_id)
1694 {
1695         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1696         struct domain_device *child;
1697         int res;
1698
1699         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1700                     SAS_ADDR(dev->sas_addr), phy_id);
1701         res = sas_ex_phy_discover(dev, phy_id);
1702         if (res)
1703                 goto out;
1704         res = sas_ex_discover_devices(dev, phy_id);
1705         if (res)
1706                 goto out;
1707         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1708                 if (SAS_ADDR(child->sas_addr) ==
1709                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1710                         if (child->dev_type == EDGE_DEV ||
1711                             child->dev_type == FANOUT_DEV)
1712                                 res = sas_discover_bfs_by_root(child);
1713                         break;
1714                 }
1715         }
1716 out:
1717         return res;
1718 }
1719
1720 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1721 {
1722         struct expander_device *ex = &dev->ex_dev;
1723         struct ex_phy *phy = &ex->ex_phy[phy_id];
1724         u8 attached_sas_addr[8];
1725         int res;
1726
1727         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1728         switch (res) {
1729         case SMP_RESP_NO_PHY:
1730                 phy->phy_state = PHY_NOT_PRESENT;
1731                 sas_unregister_devs_sas_addr(dev, phy_id);
1732                 goto out; break;
1733         case SMP_RESP_PHY_VACANT:
1734                 phy->phy_state = PHY_VACANT;
1735                 sas_unregister_devs_sas_addr(dev, phy_id);
1736                 goto out; break;
1737         case SMP_RESP_FUNC_ACC:
1738                 break;
1739         }
1740
1741         if (SAS_ADDR(attached_sas_addr) == 0) {
1742                 phy->phy_state = PHY_EMPTY;
1743                 sas_unregister_devs_sas_addr(dev, phy_id);
1744         } else if (SAS_ADDR(attached_sas_addr) ==
1745                    SAS_ADDR(phy->attached_sas_addr)) {
1746                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1747                             SAS_ADDR(dev->sas_addr), phy_id);
1748                 sas_ex_phy_discover(dev, phy_id);
1749         } else
1750                 res = sas_discover_new(dev, phy_id);
1751 out:
1752         return res;
1753 }
1754
1755 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1756 {
1757         struct expander_device *ex = &dev->ex_dev;
1758         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1759         int res = 0;
1760         int i;
1761
1762         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1763                     SAS_ADDR(dev->sas_addr), phy_id);
1764
1765         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1766                 for (i = 0; i < ex->num_phys; i++) {
1767                         struct ex_phy *phy = &ex->ex_phy[i];
1768
1769                         if (i == phy_id)
1770                                 continue;
1771                         if (SAS_ADDR(phy->attached_sas_addr) ==
1772                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1773                                 SAS_DPRINTK("phy%d part of wide port with "
1774                                             "phy%d\n", phy_id, i);
1775                                 goto out;
1776                         }
1777                 }
1778                 res = sas_rediscover_dev(dev, phy_id);
1779         } else
1780                 res = sas_discover_new(dev, phy_id);
1781 out:
1782         return res;
1783 }
1784
1785 /**
1786  * sas_revalidate_domain -- revalidate the domain
1787  * @port: port to the domain of interest
1788  *
1789  * NOTE: this process _must_ quit (return) as soon as any connection
1790  * errors are encountered.  Connection recovery is done elsewhere.
1791  * Discover process only interrogates devices in order to discover the
1792  * domain.
1793  */
1794 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1795 {
1796         int res;
1797         struct domain_device *dev = NULL;
1798
1799         res = sas_find_bcast_dev(port_dev, &dev);
1800         if (res)
1801                 goto out;
1802         if (dev) {
1803                 struct expander_device *ex = &dev->ex_dev;
1804                 int i = 0, phy_id;
1805
1806                 do {
1807                         phy_id = -1;
1808                         res = sas_find_bcast_phy(dev, &phy_id, i);
1809                         if (phy_id == -1)
1810                                 break;
1811                         res = sas_rediscover(dev, phy_id);
1812                         i = phy_id + 1;
1813                 } while (i < ex->num_phys);
1814         }
1815 out:
1816         return res;
1817 }
1818
1819 #if 0
1820 /* ---------- SMP portal ---------- */
1821
1822 static ssize_t smp_portal_write(struct kobject *kobj, char *buf, loff_t offs,
1823                                 size_t size)
1824 {
1825         struct domain_device *dev = to_dom_device(kobj);
1826         struct expander_device *ex = &dev->ex_dev;
1827
1828         if (offs != 0)
1829                 return -EFBIG;
1830         else if (size == 0)
1831                 return 0;
1832
1833         down_interruptible(&ex->smp_sema);
1834         if (ex->smp_req)
1835                 kfree(ex->smp_req);
1836         ex->smp_req = kzalloc(size, GFP_USER);
1837         if (!ex->smp_req) {
1838                 up(&ex->smp_sema);
1839                 return -ENOMEM;
1840         }
1841         memcpy(ex->smp_req, buf, size);
1842         ex->smp_req_size = size;
1843         ex->smp_portal_pid = current->pid;
1844         up(&ex->smp_sema);
1845
1846         return size;
1847 }
1848
1849 static ssize_t smp_portal_read(struct kobject *kobj, char *buf, loff_t offs,
1850                                size_t size)
1851 {
1852         struct domain_device *dev = to_dom_device(kobj);
1853         struct expander_device *ex = &dev->ex_dev;
1854         u8 *smp_resp;
1855         int res = -EINVAL;
1856
1857         /* XXX: sysfs gives us an offset of 0x10 or 0x8 while in fact
1858          *  it should be 0.
1859          */
1860
1861         down_interruptible(&ex->smp_sema);
1862         if (!ex->smp_req || ex->smp_portal_pid != current->pid)
1863                 goto out;
1864
1865         res = 0;
1866         if (size == 0)
1867                 goto out;
1868
1869         res = -ENOMEM;
1870         smp_resp = alloc_smp_resp(size);
1871         if (!smp_resp)
1872                 goto out;
1873         res = smp_execute_task(dev, ex->smp_req, ex->smp_req_size,
1874                                smp_resp, size);
1875         if (!res) {
1876                 memcpy(buf, smp_resp, size);
1877                 res = size;
1878         }
1879
1880         kfree(smp_resp);
1881 out:
1882         kfree(ex->smp_req);
1883         ex->smp_req = NULL;
1884         ex->smp_req_size = 0;
1885         ex->smp_portal_pid = -1;
1886         up(&ex->smp_sema);
1887         return res;
1888 }
1889 #endif