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/scatterlist.h>
  26 #include <linux/blkdev.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 *, struct bin_attribute *,
  43                                char *, loff_t, size_t);
  44 static ssize_t smp_portal_write(struct kobject *, struct bin_attribute *,
  45                                 char *, loff_t, size_t);
  46 #endif
  47
  48 /* ---------- SMP task management ---------- */
  49
  50 static void smp_task_timedout(unsigned long _task)
  51 {
  52         struct sas_task *task = (void *) _task;
  53         unsigned long flags;
  54
  55         spin_lock_irqsave(&task->task_state_lock, flags);
  56         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  57                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  58         spin_unlock_irqrestore(&task->task_state_lock, flags);
  59
  60         complete(&task->completion);
  61 }
  62
  63 static void smp_task_done(struct sas_task *task)
  64 {
  65         if (!del_timer(&task->timer))
  66                 return;
  67         complete(&task->completion);
  68 }
  69
  70 /* Give it some long enough timeout. In seconds. */
  71 #define SMP_TIMEOUT 10
  72
  73 static int smp_execute_task(struct domain_device *dev, void *req, int req_size,
  74                             void *resp, int resp_size)
  75 {
  76         int res, retry;
  77         struct sas_task *task = NULL;
  78         struct sas_internal *i =
  79                 to_sas_internal(dev->port->ha->core.shost->transportt);
  80
  81         for (retry = 0; retry < 3; retry++) {
  82                 task = sas_alloc_task(GFP_KERNEL);
  83                 if (!task)
  84                         return -ENOMEM;
  85
  86                 task->dev = dev;
  87                 task->task_proto = dev->tproto;
  88                 sg_init_one(&task->smp_task.smp_req, req, req_size);
  89                 sg_init_one(&task->smp_task.smp_resp, resp, resp_size);
  90
  91                 task->task_done = smp_task_done;
  92
  93                 task->timer.data = (unsigned long) task;
  94                 task->timer.function = smp_task_timedout;
  95                 task->timer.expires = jiffies + SMP_TIMEOUT*HZ;
  96                 add_timer(&task->timer);
  97
  98                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
  99
 100                 if (res) {
 101                         del_timer(&task->timer);
 102                         SAS_DPRINTK("executing SMP task failed:%d\n", res);
 103                         goto ex_err;
 104                 }
 105
 106                 wait_for_completion(&task->completion);
 107                 res = -ETASK;
 108                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 109                         SAS_DPRINTK("smp task timed out or aborted\n");
 110                         i->dft->lldd_abort_task(task);
 111                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 112                                 SAS_DPRINTK("SMP task aborted and not done\n");
 113                                 goto ex_err;
 114                         }
 115                 }
 116                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 117                     task->task_status.stat == SAM_GOOD) {
 118                         res = 0;
 119                         break;
 120                 } else {
 121                         SAS_DPRINTK("%s: task to dev %016llx response: 0x%x "
 122                                     "status 0x%x\n", __FUNCTION__,
 123                                     SAS_ADDR(dev->sas_addr),
 124                                     task->task_status.resp,
 125                                     task->task_status.stat);
 126                         sas_free_task(task);
 127                         task = NULL;
 128                 }
 129         }
 130 ex_err:
 131         BUG_ON(retry == 3 && task != NULL);
 132         if (task != NULL) {
 133                 sas_free_task(task);
 134         }
 135         return res;
 136 }
 137
 138 /* ---------- Allocations ---------- */
 139
 140 static inline void *alloc_smp_req(int size)
 141 {
 142         u8 *p = kzalloc(size, GFP_KERNEL);
 143         if (p)
 144                 p[0] = SMP_REQUEST;
 145         return p;
 146 }
 147
 148 static inline void *alloc_smp_resp(int size)
 149 {
 150         return kzalloc(size, GFP_KERNEL);
 151 }
 152
 153 /* ---------- Expander configuration ---------- */
 154
 155 static void sas_set_ex_phy(struct domain_device *dev, int phy_id,
 156                            void *disc_resp)
 157 {
 158         struct expander_device *ex = &dev->ex_dev;
 159         struct ex_phy *phy = &ex->ex_phy[phy_id];
 160         struct smp_resp *resp = disc_resp;
 161         struct discover_resp *dr = &resp->disc;
 162         struct sas_rphy *rphy = dev->rphy;
 163         int rediscover = (phy->phy != NULL);
 164
 165         if (!rediscover) {
 166                 phy->phy = sas_phy_alloc(&rphy->dev, phy_id);
 167
 168                 /* FIXME: error_handling */
 169                 BUG_ON(!phy->phy);
 170         }
 171
 172         switch (resp->result) {
 173         case SMP_RESP_PHY_VACANT:
 174                 phy->phy_state = PHY_VACANT;
 175                 return;
 176         default:
 177                 phy->phy_state = PHY_NOT_PRESENT;
 178                 return;
 179         case SMP_RESP_FUNC_ACC:
 180                 phy->phy_state = PHY_EMPTY; /* do not know yet */
 181                 break;
 182         }
 183
 184         phy->phy_id = phy_id;
 185         phy->attached_dev_type = dr->attached_dev_type;
 186         phy->linkrate = dr->linkrate;
 187         phy->attached_sata_host = dr->attached_sata_host;
 188         phy->attached_sata_dev  = dr->attached_sata_dev;
 189         phy->attached_sata_ps   = dr->attached_sata_ps;
 190         phy->attached_iproto = dr->iproto << 1;
 191         phy->attached_tproto = dr->tproto << 1;
 192         memcpy(phy->attached_sas_addr, dr->attached_sas_addr, SAS_ADDR_SIZE);
 193         phy->attached_phy_id = dr->attached_phy_id;
 194         phy->phy_change_count = dr->change_count;
 195         phy->routing_attr = dr->routing_attr;
 196         phy->virtual = dr->virtual;
 197         phy->last_da_index = -1;
 198
 199         phy->phy->identify.initiator_port_protocols = phy->attached_iproto;
 200         phy->phy->identify.target_port_protocols = phy->attached_tproto;
 201         phy->phy->identify.phy_identifier = phy_id;
 202         phy->phy->minimum_linkrate_hw = dr->hmin_linkrate;
 203         phy->phy->maximum_linkrate_hw = dr->hmax_linkrate;
 204         phy->phy->minimum_linkrate = dr->pmin_linkrate;
 205         phy->phy->maximum_linkrate = dr->pmax_linkrate;
 206         phy->phy->negotiated_linkrate = phy->linkrate;
 207
 208         if (!rediscover)
 209                 sas_phy_add(phy->phy);
 210
 211         SAS_DPRINTK("ex %016llx phy%02d:%c attached: %016llx\n",
 212                     SAS_ADDR(dev->sas_addr), phy->phy_id,
 213                     phy->routing_attr == TABLE_ROUTING ? 'T' :
 214                     phy->routing_attr == DIRECT_ROUTING ? 'D' :
 215                     phy->routing_attr == SUBTRACTIVE_ROUTING ? 'S' : '?',
 216                     SAS_ADDR(phy->attached_sas_addr));
 217
 218         return;
 219 }
 220
 221 #define DISCOVER_REQ_SIZE  16
 222 #define DISCOVER_RESP_SIZE 56
 223
 224 static int sas_ex_phy_discover_helper(struct domain_device *dev, u8 *disc_req,
 225                                       u8 *disc_resp, int single)
 226 {
 227         int i, res;
 228
 229         disc_req[9] = single;
 230         for (i = 1 ; i < 3; i++) {
 231                 struct discover_resp *dr;
 232
 233                 res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
 234                                        disc_resp, DISCOVER_RESP_SIZE);
 235                 if (res)
 236                         return res;
 237                 /* This is detecting a failure to transmit inital
 238                  * dev to host FIS as described in section G.5 of
 239                  * sas-2 r 04b */
 240                 dr = &((struct smp_resp *)disc_resp)->disc;
 241                 if (!(dr->attached_dev_type == 0 &&
 242                       dr->attached_sata_dev))
 243                         break;
 244                 /* In order to generate the dev to host FIS, we
 245                  * send a link reset to the expander port */
 246                 sas_smp_phy_control(dev, single, PHY_FUNC_LINK_RESET, NULL);
 247                 /* Wait for the reset to trigger the negotiation */
 248                 msleep(500);
 249         }
 250         sas_set_ex_phy(dev, single, disc_resp);
 251         return 0;
 252 }
 253
 254 static int sas_ex_phy_discover(struct domain_device *dev, int single)
 255 {
 256         struct expander_device *ex = &dev->ex_dev;
 257         int  res = 0;
 258         u8   *disc_req;
 259         u8   *disc_resp;
 260
 261         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
 262         if (!disc_req)
 263                 return -ENOMEM;
 264
 265         disc_resp = alloc_smp_req(DISCOVER_RESP_SIZE);
 266         if (!disc_resp) {
 267                 kfree(disc_req);
 268                 return -ENOMEM;
 269         }
 270
 271         disc_req[1] = SMP_DISCOVER;
 272
 273         if (0 <= single && single < ex->num_phys) {
 274                 res = sas_ex_phy_discover_helper(dev, disc_req, disc_resp, single);
 275         } else {
 276                 int i;
 277
 278                 for (i = 0; i < ex->num_phys; i++) {
 279                         res = sas_ex_phy_discover_helper(dev, disc_req,
 280                                                          disc_resp, i);
 281                         if (res)
 282                                 goto out_err;
 283                 }
 284         }
 285 out_err:
 286         kfree(disc_resp);
 287         kfree(disc_req);
 288         return res;
 289 }
 290
 291 static int sas_expander_discover(struct domain_device *dev)
 292 {
 293         struct expander_device *ex = &dev->ex_dev;
 294         int res = -ENOMEM;
 295
 296         ex->ex_phy = kzalloc(sizeof(*ex->ex_phy)*ex->num_phys, GFP_KERNEL);
 297         if (!ex->ex_phy)
 298                 return -ENOMEM;
 299
 300         res = sas_ex_phy_discover(dev, -1);
 301         if (res)
 302                 goto out_err;
 303
 304         return 0;
 305  out_err:
 306         kfree(ex->ex_phy);
 307         ex->ex_phy = NULL;
 308         return res;
 309 }
 310
 311 #define MAX_EXPANDER_PHYS 128
 312
 313 static void ex_assign_report_general(struct domain_device *dev,
 314                                             struct smp_resp *resp)
 315 {
 316         struct report_general_resp *rg = &resp->rg;
 317
 318         dev->ex_dev.ex_change_count = be16_to_cpu(rg->change_count);
 319         dev->ex_dev.max_route_indexes = be16_to_cpu(rg->route_indexes);
 320         dev->ex_dev.num_phys = min(rg->num_phys, (u8)MAX_EXPANDER_PHYS);
 321         dev->ex_dev.conf_route_table = rg->conf_route_table;
 322         dev->ex_dev.configuring = rg->configuring;
 323         memcpy(dev->ex_dev.enclosure_logical_id, rg->enclosure_logical_id, 8);
 324 }
 325
 326 #define RG_REQ_SIZE   8
 327 #define RG_RESP_SIZE 32
 328
 329 static int sas_ex_general(struct domain_device *dev)
 330 {
 331         u8 *rg_req;
 332         struct smp_resp *rg_resp;
 333         int res;
 334         int i;
 335
 336         rg_req = alloc_smp_req(RG_REQ_SIZE);
 337         if (!rg_req)
 338                 return -ENOMEM;
 339
 340         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
 341         if (!rg_resp) {
 342                 kfree(rg_req);
 343                 return -ENOMEM;
 344         }
 345
 346         rg_req[1] = SMP_REPORT_GENERAL;
 347
 348         for (i = 0; i < 5; i++) {
 349                 res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
 350                                        RG_RESP_SIZE);
 351
 352                 if (res) {
 353                         SAS_DPRINTK("RG to ex %016llx failed:0x%x\n",
 354                                     SAS_ADDR(dev->sas_addr), res);
 355                         goto out;
 356                 } else if (rg_resp->result != SMP_RESP_FUNC_ACC) {
 357                         SAS_DPRINTK("RG:ex %016llx returned SMP result:0x%x\n",
 358                                     SAS_ADDR(dev->sas_addr), rg_resp->result);
 359                         res = rg_resp->result;
 360                         goto out;
 361                 }
 362
 363                 ex_assign_report_general(dev, rg_resp);
 364
 365                 if (dev->ex_dev.configuring) {
 366                         SAS_DPRINTK("RG: ex %llx self-configuring...\n",
 367                                     SAS_ADDR(dev->sas_addr));
 368                         schedule_timeout_interruptible(5*HZ);
 369                 } else
 370                         break;
 371         }
 372 out:
 373         kfree(rg_req);
 374         kfree(rg_resp);
 375         return res;
 376 }
 377
 378 static void ex_assign_manuf_info(struct domain_device *dev, void
 379                                         *_mi_resp)
 380 {
 381         u8 *mi_resp = _mi_resp;
 382         struct sas_rphy *rphy = dev->rphy;
 383         struct sas_expander_device *edev = rphy_to_expander_device(rphy);
 384
 385         memcpy(edev->vendor_id, mi_resp + 12, SAS_EXPANDER_VENDOR_ID_LEN);
 386         memcpy(edev->product_id, mi_resp + 20, SAS_EXPANDER_PRODUCT_ID_LEN);
 387         memcpy(edev->product_rev, mi_resp + 36,
 388                SAS_EXPANDER_PRODUCT_REV_LEN);
 389
 390         if (mi_resp[8] & 1) {
 391                 memcpy(edev->component_vendor_id, mi_resp + 40,
 392                        SAS_EXPANDER_COMPONENT_VENDOR_ID_LEN);
 393                 edev->component_id = mi_resp[48] << 8 | mi_resp[49];
 394                 edev->component_revision_id = mi_resp[50];
 395         }
 396 }
 397
 398 #define MI_REQ_SIZE   8
 399 #define MI_RESP_SIZE 64
 400
 401 static int sas_ex_manuf_info(struct domain_device *dev)
 402 {
 403         u8 *mi_req;
 404         u8 *mi_resp;
 405         int res;
 406
 407         mi_req = alloc_smp_req(MI_REQ_SIZE);
 408         if (!mi_req)
 409                 return -ENOMEM;
 410
 411         mi_resp = alloc_smp_resp(MI_RESP_SIZE);
 412         if (!mi_resp) {
 413                 kfree(mi_req);
 414                 return -ENOMEM;
 415         }
 416
 417         mi_req[1] = SMP_REPORT_MANUF_INFO;
 418
 419         res = smp_execute_task(dev, mi_req, MI_REQ_SIZE, mi_resp,MI_RESP_SIZE);
 420         if (res) {
 421                 SAS_DPRINTK("MI: ex %016llx failed:0x%x\n",
 422                             SAS_ADDR(dev->sas_addr), res);
 423                 goto out;
 424         } else if (mi_resp[2] != SMP_RESP_FUNC_ACC) {
 425                 SAS_DPRINTK("MI ex %016llx returned SMP result:0x%x\n",
 426                             SAS_ADDR(dev->sas_addr), mi_resp[2]);
 427                 goto out;
 428         }
 429
 430         ex_assign_manuf_info(dev, mi_resp);
 431 out:
 432         kfree(mi_req);
 433         kfree(mi_resp);
 434         return res;
 435 }
 436
 437 #define PC_REQ_SIZE  44
 438 #define PC_RESP_SIZE 8
 439
 440 int sas_smp_phy_control(struct domain_device *dev, int phy_id,
 441                         enum phy_func phy_func,
 442                         struct sas_phy_linkrates *rates)
 443 {
 444         u8 *pc_req;
 445         u8 *pc_resp;
 446         int res;
 447
 448         pc_req = alloc_smp_req(PC_REQ_SIZE);
 449         if (!pc_req)
 450                 return -ENOMEM;
 451
 452         pc_resp = alloc_smp_resp(PC_RESP_SIZE);
 453         if (!pc_resp) {
 454                 kfree(pc_req);
 455                 return -ENOMEM;
 456         }
 457
 458         pc_req[1] = SMP_PHY_CONTROL;
 459         pc_req[9] = phy_id;
 460         pc_req[10]= phy_func;
 461         if (rates) {
 462                 pc_req[32] = rates->minimum_linkrate << 4;
 463                 pc_req[33] = rates->maximum_linkrate << 4;
 464         }
 465
 466         res = smp_execute_task(dev, pc_req, PC_REQ_SIZE, pc_resp,PC_RESP_SIZE);
 467
 468         kfree(pc_resp);
 469         kfree(pc_req);
 470         return res;
 471 }
 472
 473 static void sas_ex_disable_phy(struct domain_device *dev, int phy_id)
 474 {
 475         struct expander_device *ex = &dev->ex_dev;
 476         struct ex_phy *phy = &ex->ex_phy[phy_id];
 477
 478         sas_smp_phy_control(dev, phy_id, PHY_FUNC_DISABLE, NULL);
 479         phy->linkrate = SAS_PHY_DISABLED;
 480 }
 481
 482 static void sas_ex_disable_port(struct domain_device *dev, u8 *sas_addr)
 483 {
 484         struct expander_device *ex = &dev->ex_dev;
 485         int i;
 486
 487         for (i = 0; i < ex->num_phys; i++) {
 488                 struct ex_phy *phy = &ex->ex_phy[i];
 489
 490                 if (phy->phy_state == PHY_VACANT ||
 491                     phy->phy_state == PHY_NOT_PRESENT)
 492                         continue;
 493
 494                 if (SAS_ADDR(phy->attached_sas_addr) == SAS_ADDR(sas_addr))
 495                         sas_ex_disable_phy(dev, i);
 496         }
 497 }
 498
 499 static int sas_dev_present_in_domain(struct asd_sas_port *port,
 500                                             u8 *sas_addr)
 501 {
 502         struct domain_device *dev;
 503
 504         if (SAS_ADDR(port->sas_addr) == SAS_ADDR(sas_addr))
 505                 return 1;
 506         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 507                 if (SAS_ADDR(dev->sas_addr) == SAS_ADDR(sas_addr))
 508                         return 1;
 509         }
 510         return 0;
 511 }
 512
 513 #define RPEL_REQ_SIZE   16
 514 #define RPEL_RESP_SIZE  32
 515 int sas_smp_get_phy_events(struct sas_phy *phy)
 516 {
 517         int res;
 518         struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent);
 519         struct domain_device *dev = sas_find_dev_by_rphy(rphy);
 520         u8 *req = alloc_smp_req(RPEL_REQ_SIZE);
 521         u8 *resp = kzalloc(RPEL_RESP_SIZE, GFP_KERNEL);
 522
 523         if (!resp)
 524                 return -ENOMEM;
 525
 526         req[1] = SMP_REPORT_PHY_ERR_LOG;
 527         req[9] = phy->number;
 528
 529         res = smp_execute_task(dev, req, RPEL_REQ_SIZE,
 530                                     resp, RPEL_RESP_SIZE);
 531
 532         if (!res)
 533                 goto out;
 534
 535         phy->invalid_dword_count = scsi_to_u32(&resp[12]);
 536         phy->running_disparity_error_count = scsi_to_u32(&resp[16]);
 537         phy->loss_of_dword_sync_count = scsi_to_u32(&resp[20]);
 538         phy->phy_reset_problem_count = scsi_to_u32(&resp[24]);
 539
 540  out:
 541         kfree(resp);
 542         return res;
 543
 544 }
 545
 546 #define RPS_REQ_SIZE  16
 547 #define RPS_RESP_SIZE 60
 548
 549 static int sas_get_report_phy_sata(struct domain_device *dev,
 550                                           int phy_id,
 551                                           struct smp_resp *rps_resp)
 552 {
 553         int res;
 554         u8 *rps_req = alloc_smp_req(RPS_REQ_SIZE);
 555         u8 *resp = (u8 *)rps_resp;
 556
 557         if (!rps_req)
 558                 return -ENOMEM;
 559
 560         rps_req[1] = SMP_REPORT_PHY_SATA;
 561         rps_req[9] = phy_id;
 562
 563         res = smp_execute_task(dev, rps_req, RPS_REQ_SIZE,
 564                                     rps_resp, RPS_RESP_SIZE);
 565
 566         /* 0x34 is the FIS type for the D2H fis.  There's a potential
 567          * standards cockup here.  sas-2 explicitly specifies the FIS
 568          * should be encoded so that FIS type is in resp[24].
 569          * However, some expanders endian reverse this.  Undo the
 570          * reversal here */
 571         if (!res && resp[27] == 0x34 && resp[24] != 0x34) {
 572                 int i;
 573
 574                 for (i = 0; i < 5; i++) {
 575                         int j = 24 + (i*4);
 576                         u8 a, b;
 577                         a = resp[j + 0];
 578                         b = resp[j + 1];
 579                         resp[j + 0] = resp[j + 3];
 580                         resp[j + 1] = resp[j + 2];
 581                         resp[j + 2] = b;
 582                         resp[j + 3] = a;
 583                 }
 584         }
 585
 586         kfree(rps_req);
 587         return res;
 588 }
 589
 590 static void sas_ex_get_linkrate(struct domain_device *parent,
 591                                        struct domain_device *child,
 592                                        struct ex_phy *parent_phy)
 593 {
 594         struct expander_device *parent_ex = &parent->ex_dev;
 595         struct sas_port *port;
 596         int i;
 597
 598         child->pathways = 0;
 599
 600         port = parent_phy->port;
 601
 602         for (i = 0; i < parent_ex->num_phys; i++) {
 603                 struct ex_phy *phy = &parent_ex->ex_phy[i];
 604
 605                 if (phy->phy_state == PHY_VACANT ||
 606                     phy->phy_state == PHY_NOT_PRESENT)
 607                         continue;
 608
 609                 if (SAS_ADDR(phy->attached_sas_addr) ==
 610                     SAS_ADDR(child->sas_addr)) {
 611
 612                         child->min_linkrate = min(parent->min_linkrate,
 613                                                   phy->linkrate);
 614                         child->max_linkrate = max(parent->max_linkrate,
 615                                                   phy->linkrate);
 616                         child->pathways++;
 617                         sas_port_add_phy(port, phy->phy);
 618                 }
 619         }
 620         child->linkrate = min(parent_phy->linkrate, child->max_linkrate);
 621         child->pathways = min(child->pathways, parent->pathways);
 622 }
 623
 624 static struct domain_device *sas_ex_discover_end_dev(
 625         struct domain_device *parent, int phy_id)
 626 {
 627         struct expander_device *parent_ex = &parent->ex_dev;
 628         struct ex_phy *phy = &parent_ex->ex_phy[phy_id];
 629         struct domain_device *child = NULL;
 630         struct sas_rphy *rphy;
 631         int res;
 632
 633         if (phy->attached_sata_host || phy->attached_sata_ps)
 634                 return NULL;
 635
 636         child = kzalloc(sizeof(*child), GFP_KERNEL);
 637         if (!child)
 638                 return NULL;
 639
 640         child->parent = parent;
 641         child->port   = parent->port;
 642         child->iproto = phy->attached_iproto;
 643         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 644         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 645         if (!phy->port) {
 646                 phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 647                 if (unlikely(!phy->port))
 648                         goto out_err;
 649                 if (unlikely(sas_port_add(phy->port) != 0)) {
 650                         sas_port_free(phy->port);
 651                         goto out_err;
 652                 }
 653         }
 654         sas_ex_get_linkrate(parent, child, phy);
 655
 656         if ((phy->attached_tproto & SAS_PROTO_STP) || phy->attached_sata_dev) {
 657                 child->dev_type = SATA_DEV;
 658                 if (phy->attached_tproto & SAS_PROTO_STP)
 659                         child->tproto = phy->attached_tproto;
 660                 if (phy->attached_sata_dev)
 661                         child->tproto |= SATA_DEV;
 662                 res = sas_get_report_phy_sata(parent, phy_id,
 663                                               &child->sata_dev.rps_resp);
 664                 if (res) {
 665                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 666                                     "0x%x\n", SAS_ADDR(parent->sas_addr),
 667                                     phy_id, res);
 668                         goto out_free;
 669                 }
 670                 memcpy(child->frame_rcvd, &child->sata_dev.rps_resp.rps.fis,
 671                        sizeof(struct dev_to_host_fis));
 672
 673                 rphy = sas_end_device_alloc(phy->port);
 674                 if (unlikely(!rphy))
 675                         goto out_free;
 676
 677                 sas_init_dev(child);
 678
 679                 child->rphy = rphy;
 680
 681                 spin_lock_irq(&parent->port->dev_list_lock);
 682                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 683                 spin_unlock_irq(&parent->port->dev_list_lock);
 684
 685                 res = sas_discover_sata(child);
 686                 if (res) {
 687                         SAS_DPRINTK("sas_discover_sata() for device %16llx at "
 688                                     "%016llx:0x%x returned 0x%x\n",
 689                                     SAS_ADDR(child->sas_addr),
 690                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 691                         goto out_list_del;
 692                 }
 693         } else if (phy->attached_tproto & SAS_PROTO_SSP) {
 694                 child->dev_type = SAS_END_DEV;
 695                 rphy = sas_end_device_alloc(phy->port);
 696                 /* FIXME: error handling */
 697                 if (unlikely(!rphy))
 698                         goto out_free;
 699                 child->tproto = phy->attached_tproto;
 700                 sas_init_dev(child);
 701
 702                 child->rphy = rphy;
 703                 sas_fill_in_rphy(child, rphy);
 704
 705                 spin_lock_irq(&parent->port->dev_list_lock);
 706                 list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 707                 spin_unlock_irq(&parent->port->dev_list_lock);
 708
 709                 res = sas_discover_end_dev(child);
 710                 if (res) {
 711                         SAS_DPRINTK("sas_discover_end_dev() for device %16llx "
 712                                     "at %016llx:0x%x returned 0x%x\n",
 713                                     SAS_ADDR(child->sas_addr),
 714                                     SAS_ADDR(parent->sas_addr), phy_id, res);
 715                         goto out_list_del;
 716                 }
 717         } else {
 718                 SAS_DPRINTK("target proto 0x%x at %016llx:0x%x not handled\n",
 719                             phy->attached_tproto, SAS_ADDR(parent->sas_addr),
 720                             phy_id);
 721         }
 722
 723         list_add_tail(&child->siblings, &parent_ex->children);
 724         return child;
 725
 726  out_list_del:
 727         sas_rphy_free(child->rphy);
 728         child->rphy = NULL;
 729         list_del(&child->dev_list_node);
 730  out_free:
 731         sas_port_delete(phy->port);
 732  out_err:
 733         phy->port = NULL;
 734         kfree(child);
 735         return NULL;
 736 }
 737
 738 /* See if this phy is part of a wide port */
 739 static int sas_ex_join_wide_port(struct domain_device *parent, int phy_id)
 740 {
 741         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 742         int i;
 743
 744         for (i = 0; i < parent->ex_dev.num_phys; i++) {
 745                 struct ex_phy *ephy = &parent->ex_dev.ex_phy[i];
 746
 747                 if (ephy == phy)
 748                         continue;
 749
 750                 if (!memcmp(phy->attached_sas_addr, ephy->attached_sas_addr,
 751                             SAS_ADDR_SIZE) && ephy->port) {
 752                         sas_port_add_phy(ephy->port, phy->phy);
 753                         phy->phy_state = PHY_DEVICE_DISCOVERED;
 754                         return 0;
 755                 }
 756         }
 757
 758         return -ENODEV;
 759 }
 760
 761 static struct domain_device *sas_ex_discover_expander(
 762         struct domain_device *parent, int phy_id)
 763 {
 764         struct sas_expander_device *parent_ex = rphy_to_expander_device(parent->rphy);
 765         struct ex_phy *phy = &parent->ex_dev.ex_phy[phy_id];
 766         struct domain_device *child = NULL;
 767         struct sas_rphy *rphy;
 768         struct sas_expander_device *edev;
 769         struct asd_sas_port *port;
 770         int res;
 771
 772         if (phy->routing_attr == DIRECT_ROUTING) {
 773                 SAS_DPRINTK("ex %016llx:0x%x:D <--> ex %016llx:0x%x is not "
 774                             "allowed\n",
 775                             SAS_ADDR(parent->sas_addr), phy_id,
 776                             SAS_ADDR(phy->attached_sas_addr),
 777                             phy->attached_phy_id);
 778                 return NULL;
 779         }
 780         child = kzalloc(sizeof(*child), GFP_KERNEL);
 781         if (!child)
 782                 return NULL;
 783
 784         phy->port = sas_port_alloc(&parent->rphy->dev, phy_id);
 785         /* FIXME: better error handling */
 786         BUG_ON(sas_port_add(phy->port) != 0);
 787
 788
 789         switch (phy->attached_dev_type) {
 790         case EDGE_DEV:
 791                 rphy = sas_expander_alloc(phy->port,
 792                                           SAS_EDGE_EXPANDER_DEVICE);
 793                 break;
 794         case FANOUT_DEV:
 795                 rphy = sas_expander_alloc(phy->port,
 796                                           SAS_FANOUT_EXPANDER_DEVICE);
 797                 break;
 798         default:
 799                 rphy = NULL;    /* shut gcc up */
 800                 BUG();
 801         }
 802         port = parent->port;
 803         child->rphy = rphy;
 804         edev = rphy_to_expander_device(rphy);
 805         child->dev_type = phy->attached_dev_type;
 806         child->parent = parent;
 807         child->port = port;
 808         child->iproto = phy->attached_iproto;
 809         child->tproto = phy->attached_tproto;
 810         memcpy(child->sas_addr, phy->attached_sas_addr, SAS_ADDR_SIZE);
 811         sas_hash_addr(child->hashed_sas_addr, child->sas_addr);
 812         sas_ex_get_linkrate(parent, child, phy);
 813         edev->level = parent_ex->level + 1;
 814         parent->port->disc.max_level = max(parent->port->disc.max_level,
 815                                            edev->level);
 816         sas_init_dev(child);
 817         sas_fill_in_rphy(child, rphy);
 818         sas_rphy_add(rphy);
 819
 820         spin_lock_irq(&parent->port->dev_list_lock);
 821         list_add_tail(&child->dev_list_node, &parent->port->dev_list);
 822         spin_unlock_irq(&parent->port->dev_list_lock);
 823
 824         res = sas_discover_expander(child);
 825         if (res) {
 826                 kfree(child);
 827                 return NULL;
 828         }
 829         list_add_tail(&child->siblings, &parent->ex_dev.children);
 830         return child;
 831 }
 832
 833 static int sas_ex_discover_dev(struct domain_device *dev, int phy_id)
 834 {
 835         struct expander_device *ex = &dev->ex_dev;
 836         struct ex_phy *ex_phy = &ex->ex_phy[phy_id];
 837         struct domain_device *child = NULL;
 838         int res = 0;
 839
 840         /* Phy state */
 841         if (ex_phy->linkrate == SAS_SATA_SPINUP_HOLD) {
 842                 if (!sas_smp_phy_control(dev, phy_id, PHY_FUNC_LINK_RESET, NULL))
 843                         res = sas_ex_phy_discover(dev, phy_id);
 844                 if (res)
 845                         return res;
 846         }
 847
 848         /* Parent and domain coherency */
 849         if (!dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 850                              SAS_ADDR(dev->port->sas_addr))) {
 851                 sas_add_parent_port(dev, phy_id);
 852                 return 0;
 853         }
 854         if (dev->parent && (SAS_ADDR(ex_phy->attached_sas_addr) ==
 855                             SAS_ADDR(dev->parent->sas_addr))) {
 856                 sas_add_parent_port(dev, phy_id);
 857                 if (ex_phy->routing_attr == TABLE_ROUTING)
 858                         sas_configure_phy(dev, phy_id, dev->port->sas_addr, 1);
 859                 return 0;
 860         }
 861
 862         if (sas_dev_present_in_domain(dev->port, ex_phy->attached_sas_addr))
 863                 sas_ex_disable_port(dev, ex_phy->attached_sas_addr);
 864
 865         if (ex_phy->attached_dev_type == NO_DEVICE) {
 866                 if (ex_phy->routing_attr == DIRECT_ROUTING) {
 867                         memset(ex_phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
 868                         sas_configure_routing(dev, ex_phy->attached_sas_addr);
 869                 }
 870                 return 0;
 871         } else if (ex_phy->linkrate == SAS_LINK_RATE_UNKNOWN)
 872                 return 0;
 873
 874         if (ex_phy->attached_dev_type != SAS_END_DEV &&
 875             ex_phy->attached_dev_type != FANOUT_DEV &&
 876             ex_phy->attached_dev_type != EDGE_DEV) {
 877                 SAS_DPRINTK("unknown device type(0x%x) attached to ex %016llx "
 878                             "phy 0x%x\n", ex_phy->attached_dev_type,
 879                             SAS_ADDR(dev->sas_addr),
 880                             phy_id);
 881                 return 0;
 882         }
 883
 884         res = sas_configure_routing(dev, ex_phy->attached_sas_addr);
 885         if (res) {
 886                 SAS_DPRINTK("configure routing for dev %016llx "
 887                             "reported 0x%x. Forgotten\n",
 888                             SAS_ADDR(ex_phy->attached_sas_addr), res);
 889                 sas_disable_routing(dev, ex_phy->attached_sas_addr);
 890                 return res;
 891         }
 892
 893         res = sas_ex_join_wide_port(dev, phy_id);
 894         if (!res) {
 895                 SAS_DPRINTK("Attaching ex phy%d to wide port %016llx\n",
 896                             phy_id, SAS_ADDR(ex_phy->attached_sas_addr));
 897                 return res;
 898         }
 899
 900         switch (ex_phy->attached_dev_type) {
 901         case SAS_END_DEV:
 902                 child = sas_ex_discover_end_dev(dev, phy_id);
 903                 break;
 904         case FANOUT_DEV:
 905                 if (SAS_ADDR(dev->port->disc.fanout_sas_addr)) {
 906                         SAS_DPRINTK("second fanout expander %016llx phy 0x%x "
 907                                     "attached to ex %016llx phy 0x%x\n",
 908                                     SAS_ADDR(ex_phy->attached_sas_addr),
 909                                     ex_phy->attached_phy_id,
 910                                     SAS_ADDR(dev->sas_addr),
 911                                     phy_id);
 912                         sas_ex_disable_phy(dev, phy_id);
 913                         break;
 914                 } else
 915                         memcpy(dev->port->disc.fanout_sas_addr,
 916                                ex_phy->attached_sas_addr, SAS_ADDR_SIZE);
 917                 /* fallthrough */
 918         case EDGE_DEV:
 919                 child = sas_ex_discover_expander(dev, phy_id);
 920                 break;
 921         default:
 922                 break;
 923         }
 924
 925         if (child) {
 926                 int i;
 927
 928                 for (i = 0; i < ex->num_phys; i++) {
 929                         if (ex->ex_phy[i].phy_state == PHY_VACANT ||
 930                             ex->ex_phy[i].phy_state == PHY_NOT_PRESENT)
 931                                 continue;
 932
 933                         if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) ==
 934                             SAS_ADDR(child->sas_addr))
 935                                 ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED;
 936                 }
 937         }
 938
 939         return res;
 940 }
 941
 942 static int sas_find_sub_addr(struct domain_device *dev, u8 *sub_addr)
 943 {
 944         struct expander_device *ex = &dev->ex_dev;
 945         int i;
 946
 947         for (i = 0; i < ex->num_phys; i++) {
 948                 struct ex_phy *phy = &ex->ex_phy[i];
 949
 950                 if (phy->phy_state == PHY_VACANT ||
 951                     phy->phy_state == PHY_NOT_PRESENT)
 952                         continue;
 953
 954                 if ((phy->attached_dev_type == EDGE_DEV ||
 955                      phy->attached_dev_type == FANOUT_DEV) &&
 956                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
 957
 958                         memcpy(sub_addr, phy->attached_sas_addr,SAS_ADDR_SIZE);
 959
 960                         return 1;
 961                 }
 962         }
 963         return 0;
 964 }
 965
 966 static int sas_check_level_subtractive_boundary(struct domain_device *dev)
 967 {
 968         struct expander_device *ex = &dev->ex_dev;
 969         struct domain_device *child;
 970         u8 sub_addr[8] = {0, };
 971
 972         list_for_each_entry(child, &ex->children, siblings) {
 973                 if (child->dev_type != EDGE_DEV &&
 974                     child->dev_type != FANOUT_DEV)
 975                         continue;
 976                 if (sub_addr[0] == 0) {
 977                         sas_find_sub_addr(child, sub_addr);
 978                         continue;
 979                 } else {
 980                         u8 s2[8];
 981
 982                         if (sas_find_sub_addr(child, s2) &&
 983                             (SAS_ADDR(sub_addr) != SAS_ADDR(s2))) {
 984
 985                                 SAS_DPRINTK("ex %016llx->%016llx-?->%016llx "
 986                                             "diverges from subtractive "
 987                                             "boundary %016llx\n",
 988                                             SAS_ADDR(dev->sas_addr),
 989                                             SAS_ADDR(child->sas_addr),
 990                                             SAS_ADDR(s2),
 991                                             SAS_ADDR(sub_addr));
 992
 993                                 sas_ex_disable_port(child, s2);
 994                         }
 995                 }
 996         }
 997         return 0;
 998 }
 999 /**
1000  * sas_ex_discover_devices -- discover devices attached to this expander
1001  * dev: pointer to the expander domain device
1002  * single: if you want to do a single phy, else set to -1;
1003  *
1004  * Configure this expander for use with its devices and register the
1005  * devices of this expander.
1006  */
1007 static int sas_ex_discover_devices(struct domain_device *dev, int single)
1008 {
1009         struct expander_device *ex = &dev->ex_dev;
1010         int i = 0, end = ex->num_phys;
1011         int res = 0;
1012
1013         if (0 <= single && single < end) {
1014                 i = single;
1015                 end = i+1;
1016         }
1017
1018         for ( ; i < end; i++) {
1019                 struct ex_phy *ex_phy = &ex->ex_phy[i];
1020
1021                 if (ex_phy->phy_state == PHY_VACANT ||
1022                     ex_phy->phy_state == PHY_NOT_PRESENT ||
1023                     ex_phy->phy_state == PHY_DEVICE_DISCOVERED)
1024                         continue;
1025
1026                 switch (ex_phy->linkrate) {
1027                 case SAS_PHY_DISABLED:
1028                 case SAS_PHY_RESET_PROBLEM:
1029                 case SAS_SATA_PORT_SELECTOR:
1030                         continue;
1031                 default:
1032                         res = sas_ex_discover_dev(dev, i);
1033                         if (res)
1034                                 break;
1035                         continue;
1036                 }
1037         }
1038
1039         if (!res)
1040                 sas_check_level_subtractive_boundary(dev);
1041
1042         return res;
1043 }
1044
1045 static int sas_check_ex_subtractive_boundary(struct domain_device *dev)
1046 {
1047         struct expander_device *ex = &dev->ex_dev;
1048         int i;
1049         u8  *sub_sas_addr = NULL;
1050
1051         if (dev->dev_type != EDGE_DEV)
1052                 return 0;
1053
1054         for (i = 0; i < ex->num_phys; i++) {
1055                 struct ex_phy *phy = &ex->ex_phy[i];
1056
1057                 if (phy->phy_state == PHY_VACANT ||
1058                     phy->phy_state == PHY_NOT_PRESENT)
1059                         continue;
1060
1061                 if ((phy->attached_dev_type == FANOUT_DEV ||
1062                      phy->attached_dev_type == EDGE_DEV) &&
1063                     phy->routing_attr == SUBTRACTIVE_ROUTING) {
1064
1065                         if (!sub_sas_addr)
1066                                 sub_sas_addr = &phy->attached_sas_addr[0];
1067                         else if (SAS_ADDR(sub_sas_addr) !=
1068                                  SAS_ADDR(phy->attached_sas_addr)) {
1069
1070                                 SAS_DPRINTK("ex %016llx phy 0x%x "
1071                                             "diverges(%016llx) on subtractive "
1072                                             "boundary(%016llx). Disabled\n",
1073                                             SAS_ADDR(dev->sas_addr), i,
1074                                             SAS_ADDR(phy->attached_sas_addr),
1075                                             SAS_ADDR(sub_sas_addr));
1076                                 sas_ex_disable_phy(dev, i);
1077                         }
1078                 }
1079         }
1080         return 0;
1081 }
1082
1083 static void sas_print_parent_topology_bug(struct domain_device *child,
1084                                                  struct ex_phy *parent_phy,
1085                                                  struct ex_phy *child_phy)
1086 {
1087         static const char ra_char[] = {
1088                 [DIRECT_ROUTING] = 'D',
1089                 [SUBTRACTIVE_ROUTING] = 'S',
1090                 [TABLE_ROUTING] = 'T',
1091         };
1092         static const char *ex_type[] = {
1093                 [EDGE_DEV] = "edge",
1094                 [FANOUT_DEV] = "fanout",
1095         };
1096         struct domain_device *parent = child->parent;
1097
1098         sas_printk("%s ex %016llx phy 0x%x <--> %s ex %016llx phy 0x%x "
1099                    "has %c:%c routing link!\n",
1100
1101                    ex_type[parent->dev_type],
1102                    SAS_ADDR(parent->sas_addr),
1103                    parent_phy->phy_id,
1104
1105                    ex_type[child->dev_type],
1106                    SAS_ADDR(child->sas_addr),
1107                    child_phy->phy_id,
1108
1109                    ra_char[parent_phy->routing_attr],
1110                    ra_char[child_phy->routing_attr]);
1111 }
1112
1113 static int sas_check_eeds(struct domain_device *child,
1114                                  struct ex_phy *parent_phy,
1115                                  struct ex_phy *child_phy)
1116 {
1117         int res = 0;
1118         struct domain_device *parent = child->parent;
1119
1120         if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) {
1121                 res = -ENODEV;
1122                 SAS_DPRINTK("edge ex %016llx phy S:0x%x <--> edge ex %016llx "
1123                             "phy S:0x%x, while there is a fanout ex %016llx\n",
1124                             SAS_ADDR(parent->sas_addr),
1125                             parent_phy->phy_id,
1126                             SAS_ADDR(child->sas_addr),
1127                             child_phy->phy_id,
1128                             SAS_ADDR(parent->port->disc.fanout_sas_addr));
1129         } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) {
1130                 memcpy(parent->port->disc.eeds_a, parent->sas_addr,
1131                        SAS_ADDR_SIZE);
1132                 memcpy(parent->port->disc.eeds_b, child->sas_addr,
1133                        SAS_ADDR_SIZE);
1134         } else if (((SAS_ADDR(parent->port->disc.eeds_a) ==
1135                     SAS_ADDR(parent->sas_addr)) ||
1136                    (SAS_ADDR(parent->port->disc.eeds_a) ==
1137                     SAS_ADDR(child->sas_addr)))
1138                    &&
1139                    ((SAS_ADDR(parent->port->disc.eeds_b) ==
1140                      SAS_ADDR(parent->sas_addr)) ||
1141                     (SAS_ADDR(parent->port->disc.eeds_b) ==
1142                      SAS_ADDR(child->sas_addr))))
1143                 ;
1144         else {
1145                 res = -ENODEV;
1146                 SAS_DPRINTK("edge ex %016llx phy 0x%x <--> edge ex %016llx "
1147                             "phy 0x%x link forms a third EEDS!\n",
1148                             SAS_ADDR(parent->sas_addr),
1149                             parent_phy->phy_id,
1150                             SAS_ADDR(child->sas_addr),
1151                             child_phy->phy_id);
1152         }
1153
1154         return res;
1155 }
1156
1157 /* Here we spill over 80 columns.  It is intentional.
1158  */
1159 static int sas_check_parent_topology(struct domain_device *child)
1160 {
1161         struct expander_device *child_ex = &child->ex_dev;
1162         struct expander_device *parent_ex;
1163         int i;
1164         int res = 0;
1165
1166         if (!child->parent)
1167                 return 0;
1168
1169         if (child->parent->dev_type != EDGE_DEV &&
1170             child->parent->dev_type != FANOUT_DEV)
1171                 return 0;
1172
1173         parent_ex = &child->parent->ex_dev;
1174
1175         for (i = 0; i < parent_ex->num_phys; i++) {
1176                 struct ex_phy *parent_phy = &parent_ex->ex_phy[i];
1177                 struct ex_phy *child_phy;
1178
1179                 if (parent_phy->phy_state == PHY_VACANT ||
1180                     parent_phy->phy_state == PHY_NOT_PRESENT)
1181                         continue;
1182
1183                 if (SAS_ADDR(parent_phy->attached_sas_addr) != SAS_ADDR(child->sas_addr))
1184                         continue;
1185
1186                 child_phy = &child_ex->ex_phy[parent_phy->attached_phy_id];
1187
1188                 switch (child->parent->dev_type) {
1189                 case EDGE_DEV:
1190                         if (child->dev_type == FANOUT_DEV) {
1191                                 if (parent_phy->routing_attr != SUBTRACTIVE_ROUTING ||
1192                                     child_phy->routing_attr != TABLE_ROUTING) {
1193                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1194                                         res = -ENODEV;
1195                                 }
1196                         } else if (parent_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1197                                 if (child_phy->routing_attr == SUBTRACTIVE_ROUTING) {
1198                                         res = sas_check_eeds(child, parent_phy, child_phy);
1199                                 } else if (child_phy->routing_attr != TABLE_ROUTING) {
1200                                         sas_print_parent_topology_bug(child, parent_phy, child_phy);
1201                                         res = -ENODEV;
1202                                 }
1203                         } else if (parent_phy->routing_attr == TABLE_ROUTING &&
1204                                    child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1205                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1206                                 res = -ENODEV;
1207                         }
1208                         break;
1209                 case FANOUT_DEV:
1210                         if (parent_phy->routing_attr != TABLE_ROUTING ||
1211                             child_phy->routing_attr != SUBTRACTIVE_ROUTING) {
1212                                 sas_print_parent_topology_bug(child, parent_phy, child_phy);
1213                                 res = -ENODEV;
1214                         }
1215                         break;
1216                 default:
1217                         break;
1218                 }
1219         }
1220
1221         return res;
1222 }
1223
1224 #define RRI_REQ_SIZE  16
1225 #define RRI_RESP_SIZE 44
1226
1227 static int sas_configure_present(struct domain_device *dev, int phy_id,
1228                                  u8 *sas_addr, int *index, int *present)
1229 {
1230         int i, res = 0;
1231         struct expander_device *ex = &dev->ex_dev;
1232         struct ex_phy *phy = &ex->ex_phy[phy_id];
1233         u8 *rri_req;
1234         u8 *rri_resp;
1235
1236         *present = 0;
1237         *index = 0;
1238
1239         rri_req = alloc_smp_req(RRI_REQ_SIZE);
1240         if (!rri_req)
1241                 return -ENOMEM;
1242
1243         rri_resp = alloc_smp_resp(RRI_RESP_SIZE);
1244         if (!rri_resp) {
1245                 kfree(rri_req);
1246                 return -ENOMEM;
1247         }
1248
1249         rri_req[1] = SMP_REPORT_ROUTE_INFO;
1250         rri_req[9] = phy_id;
1251
1252         for (i = 0; i < ex->max_route_indexes ; i++) {
1253                 *(__be16 *)(rri_req+6) = cpu_to_be16(i);
1254                 res = smp_execute_task(dev, rri_req, RRI_REQ_SIZE, rri_resp,
1255                                        RRI_RESP_SIZE);
1256                 if (res)
1257                         goto out;
1258                 res = rri_resp[2];
1259                 if (res == SMP_RESP_NO_INDEX) {
1260                         SAS_DPRINTK("overflow of indexes: dev %016llx "
1261                                     "phy 0x%x index 0x%x\n",
1262                                     SAS_ADDR(dev->sas_addr), phy_id, i);
1263                         goto out;
1264                 } else if (res != SMP_RESP_FUNC_ACC) {
1265                         SAS_DPRINTK("%s: dev %016llx phy 0x%x index 0x%x "
1266                                     "result 0x%x\n", __FUNCTION__,
1267                                     SAS_ADDR(dev->sas_addr), phy_id, i, res);
1268                         goto out;
1269                 }
1270                 if (SAS_ADDR(sas_addr) != 0) {
1271                         if (SAS_ADDR(rri_resp+16) == SAS_ADDR(sas_addr)) {
1272                                 *index = i;
1273                                 if ((rri_resp[12] & 0x80) == 0x80)
1274                                         *present = 0;
1275                                 else
1276                                         *present = 1;
1277                                 goto out;
1278                         } else if (SAS_ADDR(rri_resp+16) == 0) {
1279                                 *index = i;
1280                                 *present = 0;
1281                                 goto out;
1282                         }
1283                 } else if (SAS_ADDR(rri_resp+16) == 0 &&
1284                            phy->last_da_index < i) {
1285                         phy->last_da_index = i;
1286                         *index = i;
1287                         *present = 0;
1288                         goto out;
1289                 }
1290         }
1291         res = -1;
1292 out:
1293         kfree(rri_req);
1294         kfree(rri_resp);
1295         return res;
1296 }
1297
1298 #define CRI_REQ_SIZE  44
1299 #define CRI_RESP_SIZE  8
1300
1301 static int sas_configure_set(struct domain_device *dev, int phy_id,
1302                              u8 *sas_addr, int index, int include)
1303 {
1304         int res;
1305         u8 *cri_req;
1306         u8 *cri_resp;
1307
1308         cri_req = alloc_smp_req(CRI_REQ_SIZE);
1309         if (!cri_req)
1310                 return -ENOMEM;
1311
1312         cri_resp = alloc_smp_resp(CRI_RESP_SIZE);
1313         if (!cri_resp) {
1314                 kfree(cri_req);
1315                 return -ENOMEM;
1316         }
1317
1318         cri_req[1] = SMP_CONF_ROUTE_INFO;
1319         *(__be16 *)(cri_req+6) = cpu_to_be16(index);
1320         cri_req[9] = phy_id;
1321         if (SAS_ADDR(sas_addr) == 0 || !include)
1322                 cri_req[12] |= 0x80;
1323         memcpy(cri_req+16, sas_addr, SAS_ADDR_SIZE);
1324
1325         res = smp_execute_task(dev, cri_req, CRI_REQ_SIZE, cri_resp,
1326                                CRI_RESP_SIZE);
1327         if (res)
1328                 goto out;
1329         res = cri_resp[2];
1330         if (res == SMP_RESP_NO_INDEX) {
1331                 SAS_DPRINTK("overflow of indexes: dev %016llx phy 0x%x "
1332                             "index 0x%x\n",
1333                             SAS_ADDR(dev->sas_addr), phy_id, index);
1334         }
1335 out:
1336         kfree(cri_req);
1337         kfree(cri_resp);
1338         return res;
1339 }
1340
1341 static int sas_configure_phy(struct domain_device *dev, int phy_id,
1342                                     u8 *sas_addr, int include)
1343 {
1344         int index;
1345         int present;
1346         int res;
1347
1348         res = sas_configure_present(dev, phy_id, sas_addr, &index, &present);
1349         if (res)
1350                 return res;
1351         if (include ^ present)
1352                 return sas_configure_set(dev, phy_id, sas_addr, index,include);
1353
1354         return res;
1355 }
1356
1357 /**
1358  * sas_configure_parent -- configure routing table of parent
1359  * parent: parent expander
1360  * child: child expander
1361  * sas_addr: SAS port identifier of device directly attached to child
1362  */
1363 static int sas_configure_parent(struct domain_device *parent,
1364                                 struct domain_device *child,
1365                                 u8 *sas_addr, int include)
1366 {
1367         struct expander_device *ex_parent = &parent->ex_dev;
1368         int res = 0;
1369         int i;
1370
1371         if (parent->parent) {
1372                 res = sas_configure_parent(parent->parent, parent, sas_addr,
1373                                            include);
1374                 if (res)
1375                         return res;
1376         }
1377
1378         if (ex_parent->conf_route_table == 0) {
1379                 SAS_DPRINTK("ex %016llx has self-configuring routing table\n",
1380                             SAS_ADDR(parent->sas_addr));
1381                 return 0;
1382         }
1383
1384         for (i = 0; i < ex_parent->num_phys; i++) {
1385                 struct ex_phy *phy = &ex_parent->ex_phy[i];
1386
1387                 if ((phy->routing_attr == TABLE_ROUTING) &&
1388                     (SAS_ADDR(phy->attached_sas_addr) ==
1389                      SAS_ADDR(child->sas_addr))) {
1390                         res = sas_configure_phy(parent, i, sas_addr, include);
1391                         if (res)
1392                                 return res;
1393                 }
1394         }
1395
1396         return res;
1397 }
1398
1399 /**
1400  * sas_configure_routing -- configure routing
1401  * dev: expander device
1402  * sas_addr: port identifier of device directly attached to the expander device
1403  */
1404 static int sas_configure_routing(struct domain_device *dev, u8 *sas_addr)
1405 {
1406         if (dev->parent)
1407                 return sas_configure_parent(dev->parent, dev, sas_addr, 1);
1408         return 0;
1409 }
1410
1411 static int sas_disable_routing(struct domain_device *dev,  u8 *sas_addr)
1412 {
1413         if (dev->parent)
1414                 return sas_configure_parent(dev->parent, dev, sas_addr, 0);
1415         return 0;
1416 }
1417
1418 #if 0
1419 #define SMP_BIN_ATTR_NAME "smp_portal"
1420
1421 static void sas_ex_smp_hook(struct domain_device *dev)
1422 {
1423         struct expander_device *ex_dev = &dev->ex_dev;
1424         struct bin_attribute *bin_attr = &ex_dev->smp_bin_attr;
1425
1426         memset(bin_attr, 0, sizeof(*bin_attr));
1427
1428         bin_attr->attr.name = SMP_BIN_ATTR_NAME;
1429         bin_attr->attr.mode = 0600;
1430
1431         bin_attr->size = 0;
1432         bin_attr->private = NULL;
1433         bin_attr->read = smp_portal_read;
1434         bin_attr->write= smp_portal_write;
1435         bin_attr->mmap = NULL;
1436
1437         ex_dev->smp_portal_pid = -1;
1438         init_MUTEX(&ex_dev->smp_sema);
1439 }
1440 #endif
1441
1442 /**
1443  * sas_discover_expander -- expander discovery
1444  * @ex: pointer to expander domain device
1445  *
1446  * See comment in sas_discover_sata().
1447  */
1448 static int sas_discover_expander(struct domain_device *dev)
1449 {
1450         int res;
1451
1452         res = sas_notify_lldd_dev_found(dev);
1453         if (res)
1454                 return res;
1455
1456         res = sas_ex_general(dev);
1457         if (res)
1458                 goto out_err;
1459         res = sas_ex_manuf_info(dev);
1460         if (res)
1461                 goto out_err;
1462
1463         res = sas_expander_discover(dev);
1464         if (res) {
1465                 SAS_DPRINTK("expander %016llx discovery failed(0x%x)\n",
1466                             SAS_ADDR(dev->sas_addr), res);
1467                 goto out_err;
1468         }
1469
1470         sas_check_ex_subtractive_boundary(dev);
1471         res = sas_check_parent_topology(dev);
1472         if (res)
1473                 goto out_err;
1474         return 0;
1475 out_err:
1476         sas_notify_lldd_dev_gone(dev);
1477         return res;
1478 }
1479
1480 static int sas_ex_level_discovery(struct asd_sas_port *port, const int level)
1481 {
1482         int res = 0;
1483         struct domain_device *dev;
1484
1485         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
1486                 if (dev->dev_type == EDGE_DEV ||
1487                     dev->dev_type == FANOUT_DEV) {
1488                         struct sas_expander_device *ex =
1489                                 rphy_to_expander_device(dev->rphy);
1490
1491                         if (level == ex->level)
1492                                 res = sas_ex_discover_devices(dev, -1);
1493                         else if (level > 0)
1494                                 res = sas_ex_discover_devices(port->port_dev, -1);
1495
1496                 }
1497         }
1498
1499         return res;
1500 }
1501
1502 static int sas_ex_bfs_disc(struct asd_sas_port *port)
1503 {
1504         int res;
1505         int level;
1506
1507         do {
1508                 level = port->disc.max_level;
1509                 res = sas_ex_level_discovery(port, level);
1510                 mb();
1511         } while (level < port->disc.max_level);
1512
1513         return res;
1514 }
1515
1516 int sas_discover_root_expander(struct domain_device *dev)
1517 {
1518         int res;
1519         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1520
1521         res = sas_rphy_add(dev->rphy);
1522         if (res)
1523                 goto out_err;
1524
1525         ex->level = dev->port->disc.max_level; /* 0 */
1526         res = sas_discover_expander(dev);
1527         if (res)
1528                 goto out_err2;
1529
1530         sas_ex_bfs_disc(dev->port);
1531
1532         return res;
1533
1534 out_err2:
1535         sas_rphy_remove(dev->rphy);
1536 out_err:
1537         return res;
1538 }
1539
1540 /* ---------- Domain revalidation ---------- */
1541
1542 static int sas_get_phy_discover(struct domain_device *dev,
1543                                 int phy_id, struct smp_resp *disc_resp)
1544 {
1545         int res;
1546         u8 *disc_req;
1547
1548         disc_req = alloc_smp_req(DISCOVER_REQ_SIZE);
1549         if (!disc_req)
1550                 return -ENOMEM;
1551
1552         disc_req[1] = SMP_DISCOVER;
1553         disc_req[9] = phy_id;
1554
1555         res = smp_execute_task(dev, disc_req, DISCOVER_REQ_SIZE,
1556                                disc_resp, DISCOVER_RESP_SIZE);
1557         if (res)
1558                 goto out;
1559         else if (disc_resp->result != SMP_RESP_FUNC_ACC) {
1560                 res = disc_resp->result;
1561                 goto out;
1562         }
1563 out:
1564         kfree(disc_req);
1565         return res;
1566 }
1567
1568 static int sas_get_phy_change_count(struct domain_device *dev,
1569                                     int phy_id, int *pcc)
1570 {
1571         int res;
1572         struct smp_resp *disc_resp;
1573
1574         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1575         if (!disc_resp)
1576                 return -ENOMEM;
1577
1578         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1579         if (!res)
1580                 *pcc = disc_resp->disc.change_count;
1581
1582         kfree(disc_resp);
1583         return res;
1584 }
1585
1586 static int sas_get_phy_attached_sas_addr(struct domain_device *dev,
1587                                          int phy_id, u8 *attached_sas_addr)
1588 {
1589         int res;
1590         struct smp_resp *disc_resp;
1591         struct discover_resp *dr;
1592
1593         disc_resp = alloc_smp_resp(DISCOVER_RESP_SIZE);
1594         if (!disc_resp)
1595                 return -ENOMEM;
1596         dr = &disc_resp->disc;
1597
1598         res = sas_get_phy_discover(dev, phy_id, disc_resp);
1599         if (!res) {
1600                 memcpy(attached_sas_addr,disc_resp->disc.attached_sas_addr,8);
1601                 if (dr->attached_dev_type == 0)
1602                         memset(attached_sas_addr, 0, 8);
1603         }
1604         kfree(disc_resp);
1605         return res;
1606 }
1607
1608 static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
1609                               int from_phy)
1610 {
1611         struct expander_device *ex = &dev->ex_dev;
1612         int res = 0;
1613         int i;
1614
1615         for (i = from_phy; i < ex->num_phys; i++) {
1616                 int phy_change_count = 0;
1617
1618                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
1619                 if (res)
1620                         goto out;
1621                 else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
1622                         ex->ex_phy[i].phy_change_count = phy_change_count;
1623                         *phy_id = i;
1624                         return 0;
1625                 }
1626         }
1627 out:
1628         return res;
1629 }
1630
1631 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)
1632 {
1633         int res;
1634         u8  *rg_req;
1635         struct smp_resp  *rg_resp;
1636
1637         rg_req = alloc_smp_req(RG_REQ_SIZE);
1638         if (!rg_req)
1639                 return -ENOMEM;
1640
1641         rg_resp = alloc_smp_resp(RG_RESP_SIZE);
1642         if (!rg_resp) {
1643                 kfree(rg_req);
1644                 return -ENOMEM;
1645         }
1646
1647         rg_req[1] = SMP_REPORT_GENERAL;
1648
1649         res = smp_execute_task(dev, rg_req, RG_REQ_SIZE, rg_resp,
1650                                RG_RESP_SIZE);
1651         if (res)
1652                 goto out;
1653         if (rg_resp->result != SMP_RESP_FUNC_ACC) {
1654                 res = rg_resp->result;
1655                 goto out;
1656         }
1657
1658         *ecc = be16_to_cpu(rg_resp->rg.change_count);
1659 out:
1660         kfree(rg_resp);
1661         kfree(rg_req);
1662         return res;
1663 }
1664
1665 static int sas_find_bcast_dev(struct domain_device *dev,
1666                               struct domain_device **src_dev)
1667 {
1668         struct expander_device *ex = &dev->ex_dev;
1669         int ex_change_count = -1;
1670         int res;
1671
1672         res = sas_get_ex_change_count(dev, &ex_change_count);
1673         if (res)
1674                 goto out;
1675         if (ex_change_count != -1 &&
1676             ex_change_count != ex->ex_change_count) {
1677                 *src_dev = dev;
1678                 ex->ex_change_count = ex_change_count;
1679         } else {
1680                 struct domain_device *ch;
1681
1682                 list_for_each_entry(ch, &ex->children, siblings) {
1683                         if (ch->dev_type == EDGE_DEV ||
1684                             ch->dev_type == FANOUT_DEV) {
1685                                 res = sas_find_bcast_dev(ch, src_dev);
1686                                 if (src_dev)
1687                                         return res;
1688                         }
1689                 }
1690         }
1691 out:
1692         return res;
1693 }
1694
1695 static void sas_unregister_ex_tree(struct domain_device *dev)
1696 {
1697         struct expander_device *ex = &dev->ex_dev;
1698         struct domain_device *child, *n;
1699
1700         list_for_each_entry_safe(child, n, &ex->children, siblings) {
1701                 if (child->dev_type == EDGE_DEV ||
1702                     child->dev_type == FANOUT_DEV)
1703                         sas_unregister_ex_tree(child);
1704                 else
1705                         sas_unregister_dev(child);
1706         }
1707         sas_unregister_dev(dev);
1708 }
1709
1710 static void sas_unregister_devs_sas_addr(struct domain_device *parent,
1711                                          int phy_id)
1712 {
1713         struct expander_device *ex_dev = &parent->ex_dev;
1714         struct ex_phy *phy = &ex_dev->ex_phy[phy_id];
1715         struct domain_device *child, *n;
1716
1717         list_for_each_entry_safe(child, n, &ex_dev->children, siblings) {
1718                 if (SAS_ADDR(child->sas_addr) ==
1719                     SAS_ADDR(phy->attached_sas_addr)) {
1720                         if (child->dev_type == EDGE_DEV ||
1721                             child->dev_type == FANOUT_DEV)
1722                                 sas_unregister_ex_tree(child);
1723                         else
1724                                 sas_unregister_dev(child);
1725                         break;
1726                 }
1727         }
1728         sas_disable_routing(parent, phy->attached_sas_addr);
1729         memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE);
1730         sas_port_delete_phy(phy->port, phy->phy);
1731         if (phy->port->num_phys == 0)
1732                 sas_port_delete(phy->port);
1733         phy->port = NULL;
1734 }
1735
1736 static int sas_discover_bfs_by_root_level(struct domain_device *root,
1737                                           const int level)
1738 {
1739         struct expander_device *ex_root = &root->ex_dev;
1740         struct domain_device *child;
1741         int res = 0;
1742
1743         list_for_each_entry(child, &ex_root->children, siblings) {
1744                 if (child->dev_type == EDGE_DEV ||
1745                     child->dev_type == FANOUT_DEV) {
1746                         struct sas_expander_device *ex =
1747                                 rphy_to_expander_device(child->rphy);
1748
1749                         if (level > ex->level)
1750                                 res = sas_discover_bfs_by_root_level(child,
1751                                                                      level);
1752                         else if (level == ex->level)
1753                                 res = sas_ex_discover_devices(child, -1);
1754                 }
1755         }
1756         return res;
1757 }
1758
1759 static int sas_discover_bfs_by_root(struct domain_device *dev)
1760 {
1761         int res;
1762         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
1763         int level = ex->level+1;
1764
1765         res = sas_ex_discover_devices(dev, -1);
1766         if (res)
1767                 goto out;
1768         do {
1769                 res = sas_discover_bfs_by_root_level(dev, level);
1770                 mb();
1771                 level += 1;
1772         } while (level <= dev->port->disc.max_level);
1773 out:
1774         return res;
1775 }
1776
1777 static int sas_discover_new(struct domain_device *dev, int phy_id)
1778 {
1779         struct ex_phy *ex_phy = &dev->ex_dev.ex_phy[phy_id];
1780         struct domain_device *child;
1781         int res;
1782
1783         SAS_DPRINTK("ex %016llx phy%d new device attached\n",
1784                     SAS_ADDR(dev->sas_addr), phy_id);
1785         res = sas_ex_phy_discover(dev, phy_id);
1786         if (res)
1787                 goto out;
1788         res = sas_ex_discover_devices(dev, phy_id);
1789         if (res)
1790                 goto out;
1791         list_for_each_entry(child, &dev->ex_dev.children, siblings) {
1792                 if (SAS_ADDR(child->sas_addr) ==
1793                     SAS_ADDR(ex_phy->attached_sas_addr)) {
1794                         if (child->dev_type == EDGE_DEV ||
1795                             child->dev_type == FANOUT_DEV)
1796                                 res = sas_discover_bfs_by_root(child);
1797                         break;
1798                 }
1799         }
1800 out:
1801         return res;
1802 }
1803
1804 static int sas_rediscover_dev(struct domain_device *dev, int phy_id)
1805 {
1806         struct expander_device *ex = &dev->ex_dev;
1807         struct ex_phy *phy = &ex->ex_phy[phy_id];
1808         u8 attached_sas_addr[8];
1809         int res;
1810
1811         res = sas_get_phy_attached_sas_addr(dev, phy_id, attached_sas_addr);
1812         switch (res) {
1813         case SMP_RESP_NO_PHY:
1814                 phy->phy_state = PHY_NOT_PRESENT;
1815                 sas_unregister_devs_sas_addr(dev, phy_id);
1816                 goto out; break;
1817         case SMP_RESP_PHY_VACANT:
1818                 phy->phy_state = PHY_VACANT;
1819                 sas_unregister_devs_sas_addr(dev, phy_id);
1820                 goto out; break;
1821         case SMP_RESP_FUNC_ACC:
1822                 break;
1823         }
1824
1825         if (SAS_ADDR(attached_sas_addr) == 0) {
1826                 phy->phy_state = PHY_EMPTY;
1827                 sas_unregister_devs_sas_addr(dev, phy_id);
1828         } else if (SAS_ADDR(attached_sas_addr) ==
1829                    SAS_ADDR(phy->attached_sas_addr)) {
1830                 SAS_DPRINTK("ex %016llx phy 0x%x broadcast flutter\n",
1831                             SAS_ADDR(dev->sas_addr), phy_id);
1832                 sas_ex_phy_discover(dev, phy_id);
1833         } else
1834                 res = sas_discover_new(dev, phy_id);
1835 out:
1836         return res;
1837 }
1838
1839 static int sas_rediscover(struct domain_device *dev, const int phy_id)
1840 {
1841         struct expander_device *ex = &dev->ex_dev;
1842         struct ex_phy *changed_phy = &ex->ex_phy[phy_id];
1843         int res = 0;
1844         int i;
1845
1846         SAS_DPRINTK("ex %016llx phy%d originated BROADCAST(CHANGE)\n",
1847                     SAS_ADDR(dev->sas_addr), phy_id);
1848
1849         if (SAS_ADDR(changed_phy->attached_sas_addr) != 0) {
1850                 for (i = 0; i < ex->num_phys; i++) {
1851                         struct ex_phy *phy = &ex->ex_phy[i];
1852
1853                         if (i == phy_id)
1854                                 continue;
1855                         if (SAS_ADDR(phy->attached_sas_addr) ==
1856                             SAS_ADDR(changed_phy->attached_sas_addr)) {
1857                                 SAS_DPRINTK("phy%d part of wide port with "
1858                                             "phy%d\n", phy_id, i);
1859                                 goto out;
1860                         }
1861                 }
1862                 res = sas_rediscover_dev(dev, phy_id);
1863         } else
1864                 res = sas_discover_new(dev, phy_id);
1865 out:
1866         return res;
1867 }
1868
1869 /**
1870  * sas_revalidate_domain -- revalidate the domain
1871  * @port: port to the domain of interest
1872  *
1873  * NOTE: this process _must_ quit (return) as soon as any connection
1874  * errors are encountered.  Connection recovery is done elsewhere.
1875  * Discover process only interrogates devices in order to discover the
1876  * domain.
1877  */
1878 int sas_ex_revalidate_domain(struct domain_device *port_dev)
1879 {
1880         int res;
1881         struct domain_device *dev = NULL;
1882
1883         res = sas_find_bcast_dev(port_dev, &dev);
1884         if (res)
1885                 goto out;
1886         if (dev) {
1887                 struct expander_device *ex = &dev->ex_dev;
1888                 int i = 0, phy_id;
1889
1890                 do {
1891                         phy_id = -1;
1892                         res = sas_find_bcast_phy(dev, &phy_id, i);
1893                         if (phy_id == -1)
1894                                 break;
1895                         res = sas_rediscover(dev, phy_id);
1896                         i = phy_id + 1;
1897                 } while (i < ex->num_phys);
1898         }
1899 out:
1900         return res;
1901 }
1902
1903 #if 0
1904 /* ---------- SMP portal ---------- */
1905
1906 static ssize_t smp_portal_write(struct kobject *kobj,
1907                                 struct bin_attribute *bin_attr,
1908                                 char *buf, loff_t offs, size_t size)
1909 {
1910         struct domain_device *dev = to_dom_device(kobj);
1911         struct expander_device *ex = &dev->ex_dev;
1912
1913         if (offs != 0)
1914                 return -EFBIG;
1915         else if (size == 0)
1916                 return 0;
1917
1918         down_interruptible(&ex->smp_sema);
1919         if (ex->smp_req)
1920                 kfree(ex->smp_req);
1921         ex->smp_req = kzalloc(size, GFP_USER);
1922         if (!ex->smp_req) {
1923                 up(&ex->smp_sema);
1924                 return -ENOMEM;
1925         }
1926         memcpy(ex->smp_req, buf, size);
1927         ex->smp_req_size = size;
1928         ex->smp_portal_pid = current->pid;
1929         up(&ex->smp_sema);
1930
1931         return size;
1932 }
1933
1934 static ssize_t smp_portal_read(struct kobject *kobj,
1935                                struct bin_attribute *bin_attr,
1936                                char *buf, loff_t offs, size_t size)
1937 {
1938         struct domain_device *dev = to_dom_device(kobj);
1939         struct expander_device *ex = &dev->ex_dev;
1940         u8 *smp_resp;
1941         int res = -EINVAL;
1942
1943         /* XXX: sysfs gives us an offset of 0x10 or 0x8 while in fact
1944          *  it should be 0.
1945          */
1946
1947         down_interruptible(&ex->smp_sema);
1948         if (!ex->smp_req || ex->smp_portal_pid != current->pid)
1949                 goto out;
1950
1951         res = 0;
1952         if (size == 0)
1953                 goto out;
1954
1955         res = -ENOMEM;
1956         smp_resp = alloc_smp_resp(size);
1957         if (!smp_resp)
1958                 goto out;
1959         res = smp_execute_task(dev, ex->smp_req, ex->smp_req_size,
1960                                smp_resp, size);
1961         if (!res) {
1962                 memcpy(buf, smp_resp, size);
1963                 res = size;
1964         }
1965
1966         kfree(smp_resp);
1967 out:
1968         kfree(ex->smp_req);
1969         ex->smp_req = NULL;
1970         ex->smp_req_size = 0;
1971         ex->smp_portal_pid = -1;
1972         up(&ex->smp_sema);
1973         return res;
1974 }
1975 #endif
1976
1977 int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
1978                     struct request *req)
1979 {
1980         struct domain_device *dev;
1981         int ret, type = rphy->identify.device_type;
1982         struct request *rsp = req->next_rq;
1983
1984         if (!rsp) {
1985                 printk("%s: space for a smp response is missing\n",
1986                        __FUNCTION__);
1987                 return -EINVAL;
1988         }
1989
1990         /* seems aic94xx doesn't support */
1991         if (!rphy) {
1992                 printk("%s: can we send a smp request to a host?\n",
1993                        __FUNCTION__);
1994                 return -EINVAL;
1995         }
1996
1997         if (type != SAS_EDGE_EXPANDER_DEVICE &&
1998             type != SAS_FANOUT_EXPANDER_DEVICE) {
1999                 printk("%s: can we send a smp request to a device?\n",
2000                        __FUNCTION__);
2001                 return -EINVAL;
2002         }
2003
2004         dev = sas_find_dev_by_rphy(rphy);
2005         if (!dev) {
2006                 printk("%s: fail to find a domain_device?\n", __FUNCTION__);
2007                 return -EINVAL;
2008         }
2009
2010         /* do we need to support multiple segments? */
2011         if (req->bio->bi_vcnt > 1 || rsp->bio->bi_vcnt > 1) {
2012                 printk("%s: multiple segments req %u %u, rsp %u %u\n",
2013                        __FUNCTION__, req->bio->bi_vcnt, req->data_len,
2014                        rsp->bio->bi_vcnt, rsp->data_len);
2015                 return -EINVAL;
2016         }
2017
2018         ret = smp_execute_task(dev, bio_data(req->bio), req->data_len,
2019                                bio_data(rsp->bio), rsp->data_len);
2020
2021         return ret;
2022 }