drivers/scsi/libsas/sas_discover.c

   1 /*
   2  * Serial Attached SCSI (SAS) Discover process
   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 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_eh.h>
  29 #include "sas_internal.h"
  30
  31 #include <scsi/scsi_transport.h>
  32 #include <scsi/scsi_transport_sas.h>
  33 #include "../scsi_sas_internal.h"
  34
  35 /* ---------- Basic task processing for discovery purposes ---------- */
  36
  37 void sas_init_dev(struct domain_device *dev)
  38 {
  39         INIT_LIST_HEAD(&dev->siblings);
  40         INIT_LIST_HEAD(&dev->dev_list_node);
  41         switch (dev->dev_type) {
  42         case SAS_END_DEV:
  43                 break;
  44         case EDGE_DEV:
  45         case FANOUT_DEV:
  46                 INIT_LIST_HEAD(&dev->ex_dev.children);
  47                 break;
  48         case SATA_DEV:
  49         case SATA_PM:
  50         case SATA_PM_PORT:
  51                 INIT_LIST_HEAD(&dev->sata_dev.children);
  52                 break;
  53         default:
  54                 break;
  55         }
  56 }
  57
  58 static void sas_task_timedout(unsigned long _task)
  59 {
  60         struct sas_task *task = (void *) _task;
  61         unsigned long flags;
  62
  63         spin_lock_irqsave(&task->task_state_lock, flags);
  64         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
  65                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
  66         spin_unlock_irqrestore(&task->task_state_lock, flags);
  67
  68         complete(&task->completion);
  69 }
  70
  71 static void sas_disc_task_done(struct sas_task *task)
  72 {
  73         if (!del_timer(&task->timer))
  74                 return;
  75         complete(&task->completion);
  76 }
  77
  78 #define SAS_DEV_TIMEOUT 10
  79
  80 /**
  81  * sas_execute_task -- Basic task processing for discovery
  82  * @task: the task to be executed
  83  * @buffer: pointer to buffer to do I/O
  84  * @size: size of @buffer
  85  * @pci_dma_dir: PCI_DMA_...
  86  */
  87 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
  88                             int pci_dma_dir)
  89 {
  90         int res = 0;
  91         struct scatterlist *scatter = NULL;
  92         struct task_status_struct *ts = &task->task_status;
  93         int num_scatter = 0;
  94         int retries = 0;
  95         struct sas_internal *i =
  96                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
  97
  98         if (pci_dma_dir != PCI_DMA_NONE) {
  99                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 100                 if (!scatter)
 101                         goto out;
 102
 103                 sg_init_one(scatter, buffer, size);
 104                 num_scatter = 1;
 105         }
 106
 107         task->task_proto = task->dev->tproto;
 108         task->scatter = scatter;
 109         task->num_scatter = num_scatter;
 110         task->total_xfer_len = size;
 111         task->data_dir = pci_dma_dir;
 112         task->task_done = sas_disc_task_done;
 113         if (pci_dma_dir != PCI_DMA_NONE &&
 114             sas_protocol_ata(task->task_proto)) {
 115                 task->num_scatter = pci_map_sg(task->dev->port->ha->pcidev,
 116                                                task->scatter,
 117                                                task->num_scatter,
 118                                                task->data_dir);
 119         }
 120
 121         for (retries = 0; retries < 5; retries++) {
 122                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 123                 init_completion(&task->completion);
 124
 125                 task->timer.data = (unsigned long) task;
 126                 task->timer.function = sas_task_timedout;
 127                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 128                 add_timer(&task->timer);
 129
 130                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 131                 if (res) {
 132                         del_timer(&task->timer);
 133                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 134                                     res);
 135                         goto ex_err;
 136                 }
 137                 wait_for_completion(&task->completion);
 138                 res = -ETASK;
 139                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 140                         int res2;
 141                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 142                                     task->task_state_flags);
 143                         res2 = i->dft->lldd_abort_task(task);
 144                         SAS_DPRINTK("came back from abort task\n");
 145                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 146                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 147                                         continue; /* Retry the task */
 148                                 else
 149                                         goto ex_err;
 150                         }
 151                 }
 152                 if (task->task_status.stat == SAM_BUSY ||
 153                            task->task_status.stat == SAM_TASK_SET_FULL ||
 154                            task->task_status.stat == SAS_QUEUE_FULL) {
 155                         SAS_DPRINTK("task: q busy, sleeping...\n");
 156                         schedule_timeout_interruptible(HZ);
 157                 } else if (task->task_status.stat == SAM_CHECK_COND) {
 158                         struct scsi_sense_hdr shdr;
 159
 160                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 161                                                   &shdr)) {
 162                                 SAS_DPRINTK("couldn't normalize sense\n");
 163                                 continue;
 164                         }
 165                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 166                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 167                              shdr.ascq == 1)) {
 168                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 169                                             "powering up or not ready yet, "
 170                                             "sleeping...\n",
 171                                             SAS_ADDR(task->dev->sas_addr),
 172                                             SAS_ADDR(task->ssp_task.LUN));
 173
 174                                 schedule_timeout_interruptible(5*HZ);
 175                         } else if (shdr.sense_key == 1) {
 176                                 res = 0;
 177                                 break;
 178                         } else if (shdr.sense_key == 5) {
 179                                 break;
 180                         } else {
 181                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 182                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 183                                             "\n",
 184                                             SAS_ADDR(task->dev->sas_addr),
 185                                             SAS_ADDR(task->ssp_task.LUN),
 186                                             shdr.sense_key,
 187                                             shdr.asc, shdr.ascq);
 188                         }
 189                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 190                            task->task_status.stat != SAM_GOOD) {
 191                         SAS_DPRINTK("task finished with resp:0x%x, "
 192                                     "stat:0x%x\n",
 193                                     task->task_status.resp,
 194                                     task->task_status.stat);
 195                         goto ex_err;
 196                 } else {
 197                         res = 0;
 198                         break;
 199                 }
 200         }
 201 ex_err:
 202         if (pci_dma_dir != PCI_DMA_NONE) {
 203                 if (sas_protocol_ata(task->task_proto))
 204                         pci_unmap_sg(task->dev->port->ha->pcidev,
 205                                      task->scatter, task->num_scatter,
 206                                      task->data_dir);
 207                 kfree(scatter);
 208         }
 209 out:
 210         return res;
 211 }
 212
 213 /* ---------- Domain device discovery ---------- */
 214
 215 /**
 216  * sas_get_port_device -- Discover devices which caused port creation
 217  * @port: pointer to struct sas_port of interest
 218  *
 219  * Devices directly attached to a HA port, have no parent.  This is
 220  * how we know they are (domain) "root" devices.  All other devices
 221  * do, and should have their "parent" pointer set appropriately as
 222  * soon as a child device is discovered.
 223  */
 224 static int sas_get_port_device(struct asd_sas_port *port)
 225 {
 226         unsigned long flags;
 227         struct asd_sas_phy *phy;
 228         struct sas_rphy *rphy;
 229         struct domain_device *dev;
 230
 231         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 232         if (!dev)
 233                 return -ENOMEM;
 234
 235         spin_lock_irqsave(&port->phy_list_lock, flags);
 236         if (list_empty(&port->phy_list)) {
 237                 spin_unlock_irqrestore(&port->phy_list_lock, flags);
 238                 kfree(dev);
 239                 return -ENODEV;
 240         }
 241         phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el);
 242         spin_lock(&phy->frame_rcvd_lock);
 243         memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd),
 244                                              (size_t)phy->frame_rcvd_size));
 245         spin_unlock(&phy->frame_rcvd_lock);
 246         spin_unlock_irqrestore(&port->phy_list_lock, flags);
 247
 248         if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) {
 249                 struct dev_to_host_fis *fis =
 250                         (struct dev_to_host_fis *) dev->frame_rcvd;
 251                 if (fis->interrupt_reason == 1 && fis->lbal == 1 &&
 252                     fis->byte_count_low==0x69 && fis->byte_count_high == 0x96
 253                     && (fis->device & ~0x10) == 0)
 254                         dev->dev_type = SATA_PM;
 255                 else
 256                         dev->dev_type = SATA_DEV;
 257                 dev->tproto = SATA_PROTO;
 258         } else {
 259                 struct sas_identify_frame *id =
 260                         (struct sas_identify_frame *) dev->frame_rcvd;
 261                 dev->dev_type = id->dev_type;
 262                 dev->iproto = id->initiator_bits;
 263                 dev->tproto = id->target_bits;
 264         }
 265
 266         sas_init_dev(dev);
 267
 268         switch (dev->dev_type) {
 269         case SAS_END_DEV:
 270         case SATA_DEV:
 271                 rphy = sas_end_device_alloc(port->port);
 272                 break;
 273         case EDGE_DEV:
 274                 rphy = sas_expander_alloc(port->port,
 275                                           SAS_EDGE_EXPANDER_DEVICE);
 276                 break;
 277         case FANOUT_DEV:
 278                 rphy = sas_expander_alloc(port->port,
 279                                           SAS_FANOUT_EXPANDER_DEVICE);
 280                 break;
 281         default:
 282                 printk("ERROR: Unidentified device type %d\n", dev->dev_type);
 283                 rphy = NULL;
 284                 break;
 285         }
 286
 287         if (!rphy) {
 288                 kfree(dev);
 289                 return -ENODEV;
 290         }
 291         rphy->identify.phy_identifier = phy->phy->identify.phy_identifier;
 292         memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE);
 293         sas_fill_in_rphy(dev, rphy);
 294         sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
 295         port->port_dev = dev;
 296         dev->port = port;
 297         dev->linkrate = port->linkrate;
 298         dev->min_linkrate = port->linkrate;
 299         dev->max_linkrate = port->linkrate;
 300         dev->pathways = port->num_phys;
 301         memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE);
 302         memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE);
 303         memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE);
 304         port->disc.max_level = 0;
 305
 306         dev->rphy = rphy;
 307         spin_lock_irq(&port->dev_list_lock);
 308         list_add_tail(&dev->dev_list_node, &port->dev_list);
 309         spin_unlock_irq(&port->dev_list_lock);
 310
 311         return 0;
 312 }
 313
 314 /* ---------- Discover and Revalidate ---------- */
 315
 316 /* ---------- SATA ---------- */
 317
 318 static void sas_get_ata_command_set(struct domain_device *dev)
 319 {
 320         struct dev_to_host_fis *fis =
 321                 (struct dev_to_host_fis *) dev->frame_rcvd;
 322
 323         if ((fis->sector_count == 1 && /* ATA */
 324              fis->lbal         == 1 &&
 325              fis->lbam         == 0 &&
 326              fis->lbah         == 0 &&
 327              fis->device       == 0)
 328             ||
 329             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 330              fis->lbal         == 0 &&
 331              fis->lbam         == 0xCE &&
 332              fis->lbah         == 0xAA &&
 333              (fis->device & ~0x10) == 0))
 334
 335                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 336
 337         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 338                   fis->lbal             == 1 &&
 339                   fis->byte_count_low   == 0x14 &&
 340                   fis->byte_count_high  == 0xEB &&
 341                   (fis->device & ~0x10) == 0))
 342
 343                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 344
 345         else if ((fis->sector_count == 1 && /* SEMB */
 346                   fis->lbal         == 1 &&
 347                   fis->lbam         == 0x3C &&
 348                   fis->lbah         == 0xC3 &&
 349                   fis->device       == 0)
 350                 ||
 351                  (fis->interrupt_reason == 1 && /* SATA PM */
 352                   fis->lbal             == 1 &&
 353                   fis->byte_count_low   == 0x69 &&
 354                   fis->byte_count_high  == 0x96 &&
 355                   (fis->device & ~0x10) == 0))
 356
 357                 /* Treat it as a superset? */
 358                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 359 }
 360
 361 /**
 362  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 363  * @dev: the device to send the command to
 364  * @command: the command register
 365  * @features: the features register
 366  * @buffer: pointer to buffer to do I/O
 367  * @size: size of @buffer
 368  * @pci_dma_dir: PCI_DMA_...
 369  */
 370 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 371                              u8 features, void *buffer, int size,
 372                              int pci_dma_dir)
 373 {
 374         int res = 0;
 375         struct sas_task *task;
 376         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 377                 &dev->frame_rcvd[0];
 378
 379         res = -ENOMEM;
 380         task = sas_alloc_task(GFP_KERNEL);
 381         if (!task)
 382                 goto out;
 383
 384         task->dev = dev;
 385
 386         task->ata_task.fis.fis_type = 0x27;
 387         task->ata_task.fis.command = command;
 388         task->ata_task.fis.features = features;
 389         task->ata_task.fis.device = d2h_fis->device;
 390         task->ata_task.retry_count = 1;
 391
 392         res = sas_execute_task(task, buffer, size, pci_dma_dir);
 393
 394         sas_free_task(task);
 395 out:
 396         return res;
 397 }
 398
 399 static void sas_sata_propagate_sas_addr(struct domain_device *dev)
 400 {
 401         unsigned long flags;
 402         struct asd_sas_port *port = dev->port;
 403         struct asd_sas_phy  *phy;
 404
 405         BUG_ON(dev->parent);
 406
 407         memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
 408         spin_lock_irqsave(&port->phy_list_lock, flags);
 409         list_for_each_entry(phy, &port->phy_list, port_phy_el)
 410                 memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
 411         spin_unlock_irqrestore(&port->phy_list_lock, flags);
 412 }
 413
 414 #define ATA_IDENTIFY_DEV         0xEC
 415 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 416 #define ATA_SET_FEATURES         0xEF
 417 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 418
 419 /**
 420  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 421  * @dev: STP/SATA device of interest (ATA/ATAPI)
 422  *
 423  * The LLDD has already been notified of this device, so that we can
 424  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 425  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 426  * performance for this device.
 427  */
 428 static int sas_discover_sata_dev(struct domain_device *dev)
 429 {
 430         int     res;
 431         __le16  *identify_x;
 432         u8      command;
 433
 434         identify_x = kzalloc(512, GFP_KERNEL);
 435         if (!identify_x)
 436                 return -ENOMEM;
 437
 438         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 439                 dev->sata_dev.identify_device = identify_x;
 440                 command = ATA_IDENTIFY_DEV;
 441         } else {
 442                 dev->sata_dev.identify_packet_device = identify_x;
 443                 command = ATA_IDENTIFY_PACKET_DEV;
 444         }
 445
 446         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 447                                 PCI_DMA_FROMDEVICE);
 448         if (res)
 449                 goto out_err;
 450
 451         /* lives on the media? */
 452         if (le16_to_cpu(identify_x[0]) & 4) {
 453                 /* incomplete response */
 454                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 455                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 456                 if (!le16_to_cpu(identify_x[83] & (1<<6)))
 457                         goto cont1;
 458                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 459                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 460                                         NULL, 0, PCI_DMA_NONE);
 461                 if (res)
 462                         goto cont1;
 463
 464                 schedule_timeout_interruptible(5*HZ); /* More time? */
 465                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 466                                         PCI_DMA_FROMDEVICE);
 467                 if (res)
 468                         goto out_err;
 469         }
 470 cont1:
 471         /* Get WWN */
 472         if (dev->port->oob_mode != SATA_OOB_MODE) {
 473                 memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
 474                        SAS_ADDR_SIZE);
 475         } else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
 476                    (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
 477                    == 0x5000) {
 478                 int i;
 479
 480                 for (i = 0; i < 4; i++) {
 481                         dev->sas_addr[2*i] =
 482              (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
 483                         dev->sas_addr[2*i+1] =
 484               le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
 485                 }
 486         }
 487         sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
 488         if (!dev->parent)
 489                 sas_sata_propagate_sas_addr(dev);
 490
 491         /* XXX Hint: register this SATA device with SATL.
 492            When this returns, dev->sata_dev->lu is alive and
 493            present.
 494         sas_satl_register_dev(dev);
 495         */
 496
 497         sas_fill_in_rphy(dev, dev->rphy);
 498
 499         return 0;
 500 out_err:
 501         dev->sata_dev.identify_packet_device = NULL;
 502         dev->sata_dev.identify_device = NULL;
 503         kfree(identify_x);
 504         return res;
 505 }
 506
 507 static int sas_discover_sata_pm(struct domain_device *dev)
 508 {
 509         return -ENODEV;
 510 }
 511
 512 int sas_notify_lldd_dev_found(struct domain_device *dev)
 513 {
 514         int res = 0;
 515         struct sas_ha_struct *sas_ha = dev->port->ha;
 516         struct Scsi_Host *shost = sas_ha->core.shost;
 517         struct sas_internal *i = to_sas_internal(shost->transportt);
 518
 519         if (i->dft->lldd_dev_found) {
 520                 res = i->dft->lldd_dev_found(dev);
 521                 if (res) {
 522                         printk("sas: driver on pcidev %s cannot handle "
 523                                "device %llx, error:%d\n",
 524                                pci_name(sas_ha->pcidev),
 525                                SAS_ADDR(dev->sas_addr), res);
 526                 }
 527         }
 528         return res;
 529 }
 530
 531
 532 void sas_notify_lldd_dev_gone(struct domain_device *dev)
 533 {
 534         struct sas_ha_struct *sas_ha = dev->port->ha;
 535         struct Scsi_Host *shost = sas_ha->core.shost;
 536         struct sas_internal *i = to_sas_internal(shost->transportt);
 537
 538         if (i->dft->lldd_dev_gone)
 539                 i->dft->lldd_dev_gone(dev);
 540 }
 541
 542 /* ---------- Common/dispatchers ---------- */
 543
 544 /**
 545  * sas_discover_sata -- discover an STP/SATA domain device
 546  * @dev: pointer to struct domain_device of interest
 547  *
 548  * First we notify the LLDD of this device, so we can send frames to
 549  * it.  Then depending on the type of device we call the appropriate
 550  * discover functions.  Once device discover is done, we notify the
 551  * LLDD so that it can fine-tune its parameters for the device, by
 552  * removing it and then adding it.  That is, the second time around,
 553  * the driver would have certain fields, that it is looking at, set.
 554  * Finally we initialize the kobj so that the device can be added to
 555  * the system at registration time.  Devices directly attached to a HA
 556  * port, have no parents.  All other devices do, and should have their
 557  * "parent" pointer set appropriately before calling this function.
 558  */
 559 int sas_discover_sata(struct domain_device *dev)
 560 {
 561         int res;
 562
 563         sas_get_ata_command_set(dev);
 564
 565         res = sas_notify_lldd_dev_found(dev);
 566         if (res)
 567                 return res;
 568
 569         switch (dev->dev_type) {
 570         case SATA_DEV:
 571                 res = sas_discover_sata_dev(dev);
 572                 break;
 573         case SATA_PM:
 574                 res = sas_discover_sata_pm(dev);
 575                 break;
 576         default:
 577                 break;
 578         }
 579         sas_notify_lldd_dev_gone(dev);
 580         if (!res) {
 581                 sas_notify_lldd_dev_found(dev);
 582                 res = sas_rphy_add(dev->rphy);
 583         }
 584
 585         return res;
 586 }
 587
 588 /**
 589  * sas_discover_end_dev -- discover an end device (SSP, etc)
 590  * @end: pointer to domain device of interest
 591  *
 592  * See comment in sas_discover_sata().
 593  */
 594 int sas_discover_end_dev(struct domain_device *dev)
 595 {
 596         int res;
 597
 598         res = sas_notify_lldd_dev_found(dev);
 599         if (res)
 600                 goto out_err2;
 601
 602         res = sas_rphy_add(dev->rphy);
 603         if (res)
 604                 goto out_err;
 605
 606         return 0;
 607
 608 out_err:
 609         sas_notify_lldd_dev_gone(dev);
 610 out_err2:
 611         return res;
 612 }
 613
 614 /* ---------- Device registration and unregistration ---------- */
 615
 616 static inline void sas_unregister_common_dev(struct domain_device *dev)
 617 {
 618         sas_notify_lldd_dev_gone(dev);
 619         if (!dev->parent)
 620                 dev->port->port_dev = NULL;
 621         else
 622                 list_del_init(&dev->siblings);
 623         list_del_init(&dev->dev_list_node);
 624 }
 625
 626 void sas_unregister_dev(struct domain_device *dev)
 627 {
 628         if (dev->rphy) {
 629                 sas_remove_children(&dev->rphy->dev);
 630                 sas_rphy_delete(dev->rphy);
 631                 dev->rphy = NULL;
 632         }
 633         if (dev->dev_type == EDGE_DEV || dev->dev_type == FANOUT_DEV) {
 634                 /* remove the phys and ports, everything else should be gone */
 635                 kfree(dev->ex_dev.ex_phy);
 636                 dev->ex_dev.ex_phy = NULL;
 637         }
 638         sas_unregister_common_dev(dev);
 639 }
 640
 641 void sas_unregister_domain_devices(struct asd_sas_port *port)
 642 {
 643         struct domain_device *dev, *n;
 644
 645         list_for_each_entry_safe_reverse(dev,n,&port->dev_list,dev_list_node)
 646                 sas_unregister_dev(dev);
 647
 648         port->port->rphy = NULL;
 649
 650 }
 651
 652 /* ---------- Discovery and Revalidation ---------- */
 653
 654 /**
 655  * sas_discover_domain -- discover the domain
 656  * @port: port to the domain of interest
 657  *
 658  * NOTE: this process _must_ quit (return) as soon as any connection
 659  * errors are encountered.  Connection recovery is done elsewhere.
 660  * Discover process only interrogates devices in order to discover the
 661  * domain.
 662  */
 663 static void sas_discover_domain(struct work_struct *work)
 664 {
 665         struct domain_device *dev;
 666         int error = 0;
 667         struct sas_discovery_event *ev =
 668                 container_of(work, struct sas_discovery_event, work);
 669         struct asd_sas_port *port = ev->port;
 670
 671         sas_begin_event(DISCE_DISCOVER_DOMAIN, &port->disc.disc_event_lock,
 672                         &port->disc.pending);
 673
 674         if (port->port_dev)
 675                 return;
 676
 677         error = sas_get_port_device(port);
 678         if (error)
 679                 return;
 680         dev = port->port_dev;
 681
 682         SAS_DPRINTK("DOING DISCOVERY on port %d, pid:%d\n", port->id,
 683                     current->pid);
 684
 685         switch (dev->dev_type) {
 686         case SAS_END_DEV:
 687                 error = sas_discover_end_dev(dev);
 688                 break;
 689         case EDGE_DEV:
 690         case FANOUT_DEV:
 691                 error = sas_discover_root_expander(dev);
 692                 break;
 693         case SATA_DEV:
 694         case SATA_PM:
 695                 error = sas_discover_sata(dev);
 696                 break;
 697         default:
 698                 SAS_DPRINTK("unhandled device %d\n", dev->dev_type);
 699                 break;
 700         }
 701
 702         if (error) {
 703                 sas_rphy_free(dev->rphy);
 704                 dev->rphy = NULL;
 705
 706                 spin_lock_irq(&port->dev_list_lock);
 707                 list_del_init(&dev->dev_list_node);
 708                 spin_unlock_irq(&port->dev_list_lock);
 709
 710                 kfree(dev); /* not kobject_register-ed yet */
 711                 port->port_dev = NULL;
 712         }
 713
 714         SAS_DPRINTK("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id,
 715                     current->pid, error);
 716 }
 717
 718 static void sas_revalidate_domain(struct work_struct *work)
 719 {
 720         int res = 0;
 721         struct sas_discovery_event *ev =
 722                 container_of(work, struct sas_discovery_event, work);
 723         struct asd_sas_port *port = ev->port;
 724
 725         sas_begin_event(DISCE_REVALIDATE_DOMAIN, &port->disc.disc_event_lock,
 726                         &port->disc.pending);
 727
 728         SAS_DPRINTK("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id,
 729                     current->pid);
 730         if (port->port_dev)
 731                 res = sas_ex_revalidate_domain(port->port_dev);
 732
 733         SAS_DPRINTK("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n",
 734                     port->id, current->pid, res);
 735 }
 736
 737 /* ---------- Events ---------- */
 738
 739 int sas_discover_event(struct asd_sas_port *port, enum discover_event ev)
 740 {
 741         struct sas_discovery *disc;
 742
 743         if (!port)
 744                 return 0;
 745         disc = &port->disc;
 746
 747         BUG_ON(ev >= DISC_NUM_EVENTS);
 748
 749         sas_queue_event(ev, &disc->disc_event_lock, &disc->pending,
 750                         &disc->disc_work[ev].work, port->ha);
 751
 752         return 0;
 753 }
 754
 755 /**
 756  * sas_init_disc -- initialize the discovery struct in the port
 757  * @port: pointer to struct port
 758  *
 759  * Called when the ports are being initialized.
 760  */
 761 void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port)
 762 {
 763         int i;
 764
 765         static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = {
 766                 [DISCE_DISCOVER_DOMAIN] = sas_discover_domain,
 767                 [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain,
 768         };
 769
 770         spin_lock_init(&disc->disc_event_lock);
 771         disc->pending = 0;
 772         for (i = 0; i < DISC_NUM_EVENTS; i++) {
 773                 INIT_WORK(&disc->disc_work[i].work, sas_event_fns[i]);
 774                 disc->disc_work[i].port = port;
 775         }
 776 }