drivers/scsi/isci/port.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 /**
  57  * This file contains the isci port implementation.
  58  *
  59  *
  60  */
  61
  62
  63 #include <linux/workqueue.h>
  64 #include "isci.h"
  65 #include "scic_io_request.h"
  66 #include "scic_phy.h"
  67 #include "scic_sds_phy.h"
  68 #include "scic_port.h"
  69 #include "port.h"
  70 #include "request.h"
  71
  72 static void isci_port_change_state(
  73         struct isci_port *isci_port,
  74         enum isci_status status);
  75
  76
  77
  78 /**
  79  * isci_port_init() - This function initializes the given isci_port object.
  80  * @isci_port: This parameter specifies the port object to be initialized.
  81  * @isci_host: This parameter specifies parent controller object for the port.
  82  * @index: This parameter specifies which SCU port the isci_port associates
  83  *    with. Generally, SCU port 0 relates to isci_port 0, etc.
  84  *
  85  */
  86 void isci_port_init(
  87         struct isci_port *isci_port,
  88         struct isci_host *isci_host,
  89         int index)
  90 {
  91         struct scic_sds_port *scic_port;
  92         struct scic_sds_controller *controller = isci_host->core_controller;
  93
  94         INIT_LIST_HEAD(&isci_port->remote_dev_list);
  95         INIT_LIST_HEAD(&isci_port->domain_dev_list);
  96         spin_lock_init(&isci_port->state_lock);
  97         init_completion(&isci_port->start_complete);
  98         isci_port->isci_host = isci_host;
  99         isci_port_change_state(isci_port, isci_freed);
 100
 101         (void)scic_controller_get_port_handle(controller, index, &scic_port);
 102         sci_object_set_association(scic_port, isci_port);
 103         isci_port->sci_port_handle = scic_port;
 104 }
 105
 106
 107 /**
 108  * isci_port_get_state() - This function gets the status of the port object.
 109  * @isci_port: This parameter points to the isci_port object
 110  *
 111  * status of the object as a isci_status enum.
 112  */
 113 enum isci_status isci_port_get_state(
 114         struct isci_port *isci_port)
 115 {
 116         return isci_port->status;
 117 }
 118
 119 static void isci_port_change_state(
 120         struct isci_port *isci_port,
 121         enum isci_status status)
 122 {
 123         unsigned long flags;
 124
 125         dev_dbg(&isci_port->isci_host->pdev->dev,
 126                 "%s: isci_port = %p, state = 0x%x\n",
 127                 __func__, isci_port, status);
 128
 129         spin_lock_irqsave(&isci_port->state_lock, flags);
 130         isci_port->status = status;
 131         spin_unlock_irqrestore(&isci_port->state_lock, flags);
 132 }
 133
 134 void isci_port_bc_change_received(
 135         struct isci_host *isci_host,
 136         struct scic_sds_port *port,
 137         struct scic_sds_phy *phy)
 138 {
 139         struct isci_phy *isci_phy =
 140                 (struct isci_phy *)sci_object_get_association(phy);
 141
 142         dev_dbg(&isci_host->pdev->dev,
 143                 "%s: isci_phy = %p, sas_phy = %p\n",
 144                 __func__,
 145                 isci_phy,
 146                 &isci_phy->sas_phy);
 147
 148         isci_host->sas_ha.notify_port_event(
 149                 &isci_phy->sas_phy,
 150                 PORTE_BROADCAST_RCVD
 151                 );
 152
 153         scic_port_enable_broadcast_change_notification(port);
 154 }
 155
 156 /**
 157  * isci_port_link_up() - This function is called by the sci core when a link
 158  *    becomes active. the identify address frame is retrieved from the core and
 159  *    a notify port event is sent to libsas.
 160  * @isci_host: This parameter specifies the isci host object.
 161  * @port: This parameter specifies the sci port with the active link.
 162  * @phy: This parameter specifies the sci phy with the active link.
 163  *
 164  */
 165 void isci_port_link_up(
 166         struct isci_host *isci_host,
 167         struct scic_sds_port *port,
 168         struct scic_sds_phy *phy)
 169 {
 170         unsigned long flags;
 171         struct scic_port_properties properties;
 172         struct isci_phy *isci_phy
 173                 = (struct isci_phy *)sci_object_get_association(phy);
 174         struct isci_port *isci_port
 175                 = (struct isci_port *)sci_object_get_association(port);
 176         enum sci_status call_status;
 177         unsigned long success = true;
 178
 179         BUG_ON(isci_phy->isci_port != NULL);
 180
 181         isci_phy->isci_port = isci_port;
 182
 183         dev_dbg(&isci_host->pdev->dev,
 184                 "%s: isci_port = %p\n",
 185                 __func__, isci_port);
 186
 187         spin_lock_irqsave(&isci_phy->sas_phy.frame_rcvd_lock, flags);
 188
 189         isci_port_change_state(isci_phy->isci_port, isci_starting);
 190
 191         scic_port_get_properties(port, &properties);
 192
 193         if (properties.remote.protocols.u.bits.stp_target) {
 194                 u64 attached_sas_address;
 195
 196                 struct scic_sata_phy_properties sata_phy_properties;
 197
 198                 isci_phy->sas_phy.oob_mode = SATA_OOB_MODE;
 199
 200                 /* Get a copy of the signature fis for libsas */
 201                 call_status = scic_sata_phy_get_properties(phy,
 202                                                            &sata_phy_properties);
 203
 204                 /*
 205                  * XXX I am concerned about this "assert". shouldn't we
 206                  * handle the return appropriately?
 207                  */
 208                 BUG_ON(call_status != SCI_SUCCESS);
 209
 210                 memcpy(isci_phy->frame_rcvd.fis,
 211                        &sata_phy_properties.signature_fis,
 212                        sizeof(struct sata_fis_reg_d2h));
 213
 214                 isci_phy->sas_phy.frame_rcvd_size = sizeof(struct sata_fis_reg_d2h);
 215
 216                 /*
 217                  * For direct-attached SATA devices, the SCI core will
 218                  * automagically assign a SAS address to the end device
 219                  * for the purpose of creating a port. This SAS address
 220                  * will not be the same as assigned to the PHY and needs
 221                  * to be obtained from struct scic_port_properties properties.
 222                  */
 223                 attached_sas_address = properties.remote.sas_address.high;
 224                 attached_sas_address <<= 32;
 225                 attached_sas_address |= properties.remote.sas_address.low;
 226                 swab64s(&attached_sas_address);
 227
 228                 memcpy(&isci_phy->sas_phy.attached_sas_addr,
 229                        &attached_sas_address, sizeof(attached_sas_address));
 230
 231         } else if (properties.remote.protocols.u.bits.ssp_target ||
 232                    properties.remote.protocols.u.bits.smp_target) {
 233
 234                 struct scic_sas_phy_properties sas_phy_properties;
 235
 236                 isci_phy->sas_phy.oob_mode = SAS_OOB_MODE;
 237
 238                 /* Get a copy of the identify address frame for libsas */
 239                 call_status = scic_sas_phy_get_properties(phy,
 240                                                           &sas_phy_properties);
 241
 242                 BUG_ON(call_status != SCI_SUCCESS);
 243
 244                 memcpy(isci_phy->frame_rcvd.aif,
 245                        &(sas_phy_properties.received_iaf),
 246                        sizeof(struct sci_sas_identify_address_frame));
 247
 248                 isci_phy->sas_phy.frame_rcvd_size
 249                         = sizeof(struct sci_sas_identify_address_frame);
 250
 251                 /* Copy the attached SAS address from the IAF */
 252                 memcpy(isci_phy->sas_phy.attached_sas_addr,
 253                        ((struct sas_identify_frame *)
 254                         (&isci_phy->frame_rcvd.aif))->sas_addr,
 255                        SAS_ADDR_SIZE);
 256
 257         } else {
 258                 dev_err(&isci_host->pdev->dev, "%s: unkown target\n", __func__);
 259                 success = false;
 260         }
 261
 262         isci_phy->sas_phy.phy->negotiated_linkrate = sci_phy_linkrate(phy);
 263
 264         spin_unlock_irqrestore(&isci_phy->sas_phy.frame_rcvd_lock, flags);
 265
 266         /* Notify libsas that we have an address frame, if indeed
 267          * we've found an SSP, SMP, or STP target */
 268         if (success)
 269                 isci_host->sas_ha.notify_port_event(&isci_phy->sas_phy,
 270                                                     PORTE_BYTES_DMAED);
 271 }
 272
 273
 274 /**
 275  * isci_port_link_down() - This function is called by the sci core when a link
 276  *    becomes inactive.
 277  * @isci_host: This parameter specifies the isci host object.
 278  * @phy: This parameter specifies the isci phy with the active link.
 279  * @port: This parameter specifies the isci port with the active link.
 280  *
 281  */
 282 void isci_port_link_down(struct isci_host *isci_host, struct isci_phy *isci_phy,
 283                          struct isci_port *isci_port)
 284 {
 285         struct isci_remote_device *isci_device;
 286
 287         dev_dbg(&isci_host->pdev->dev,
 288                 "%s: isci_port = %p\n", __func__, isci_port);
 289
 290         if (isci_port) {
 291
 292                 /* check to see if this is the last phy on this port. */
 293                 if (isci_phy->sas_phy.port
 294                     && isci_phy->sas_phy.port->num_phys == 1) {
 295
 296                         /* change the state for all devices on this port.
 297                          * The next task sent to this device will be returned
 298                          * as SAS_TASK_UNDELIVERED, and the scsi mid layer
 299                          * will remove the target
 300                          */
 301                         list_for_each_entry(isci_device,
 302                                             &isci_port->remote_dev_list,
 303                                             node) {
 304                                 dev_dbg(&isci_host->pdev->dev,
 305                                         "%s: isci_device = %p\n",
 306                                         __func__, isci_device);
 307                                 isci_remote_device_change_state(isci_device,
 308                                                                 isci_stopping);
 309                         }
 310                 }
 311                 isci_port_change_state(isci_port, isci_stopping);
 312         }
 313
 314         /* Notify libsas of the borken link, this will trigger calls to our
 315          * isci_port_deformed and isci_dev_gone functions.
 316          */
 317         sas_phy_disconnected(&isci_phy->sas_phy);
 318         isci_host->sas_ha.notify_phy_event(&isci_phy->sas_phy,
 319                                            PHYE_LOSS_OF_SIGNAL);
 320
 321         isci_phy->isci_port = NULL;
 322
 323         dev_dbg(&isci_host->pdev->dev,
 324                 "%s: isci_port = %p - Done\n", __func__, isci_port);
 325 }
 326
 327
 328 /**
 329  * isci_port_deformed() - This function is called by libsas when a port becomes
 330  *    inactive.
 331  * @phy: This parameter specifies the libsas phy with the inactive port.
 332  *
 333  */
 334 void isci_port_deformed(
 335         struct asd_sas_phy *phy)
 336 {
 337         pr_debug("%s: sas_phy = %p\n", __func__, phy);
 338 }
 339
 340 /**
 341  * isci_port_formed() - This function is called by libsas when a port becomes
 342  *    active.
 343  * @phy: This parameter specifies the libsas phy with the active port.
 344  *
 345  */
 346 void isci_port_formed(
 347         struct asd_sas_phy *phy)
 348 {
 349         pr_debug("%s: sas_phy = %p, sas_port = %p\n", __func__, phy, phy->port);
 350 }
 351
 352 /**
 353  * isci_port_ready() - This function is called by the sci core when a link
 354  *    becomes ready.
 355  * @isci_host: This parameter specifies the isci host object.
 356  * @port: This parameter specifies the sci port with the active link.
 357  *
 358  */
 359 void isci_port_ready(struct isci_host *isci_host, struct isci_port *isci_port)
 360 {
 361         dev_dbg(&isci_host->pdev->dev,
 362                 "%s: isci_port = %p\n", __func__, isci_port);
 363
 364         complete_all(&isci_port->start_complete);
 365         isci_port_change_state(isci_port, isci_ready);
 366         return;
 367 }
 368
 369 /**
 370  * isci_port_not_ready() - This function is called by the sci core when a link
 371  *    is not ready. All remote devices on this link will be removed if they are
 372  *    in the stopping state.
 373  * @isci_host: This parameter specifies the isci host object.
 374  * @port: This parameter specifies the sci port with the active link.
 375  *
 376  */
 377 void isci_port_not_ready(struct isci_host *isci_host, struct isci_port *isci_port)
 378 {
 379         dev_dbg(&isci_host->pdev->dev,
 380                 "%s: isci_port = %p\n", __func__, isci_port);
 381 }
 382
 383 /**
 384  * isci_port_hard_reset_complete() - This function is called by the sci core
 385  *    when the hard reset complete notification has been received.
 386  * @port: This parameter specifies the sci port with the active link.
 387  * @completion_status: This parameter specifies the core status for the reset
 388  *    process.
 389  *
 390  */
 391 void isci_port_hard_reset_complete(struct isci_port *isci_port,
 392                                    enum sci_status completion_status)
 393 {
 394         dev_dbg(&isci_port->isci_host->pdev->dev,
 395                 "%s: isci_port = %p, completion_status=%x\n",
 396                      __func__, isci_port, completion_status);
 397
 398         /* Save the status of the hard reset from the port. */
 399         isci_port->hard_reset_status = completion_status;
 400
 401         complete_all(&isci_port->hard_reset_complete);
 402 }
 403
 404 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
 405                                  struct isci_phy *iphy)
 406 {
 407         unsigned long flags;
 408         enum sci_status status;
 409         int ret = TMF_RESP_FUNC_COMPLETE;
 410
 411         dev_dbg(&ihost->pdev->dev, "%s: iport = %p\n",
 412                 __func__, iport);
 413
 414         init_completion(&iport->hard_reset_complete);
 415
 416         spin_lock_irqsave(&ihost->scic_lock, flags);
 417
 418         #define ISCI_PORT_RESET_TIMEOUT SCIC_SDS_SIGNATURE_FIS_TIMEOUT
 419         status = scic_port_hard_reset(iport->sci_port_handle,
 420                                       ISCI_PORT_RESET_TIMEOUT);
 421
 422         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 423
 424         if (status == SCI_SUCCESS) {
 425                 wait_for_completion(&iport->hard_reset_complete);
 426
 427                 dev_dbg(&ihost->pdev->dev,
 428                         "%s: iport = %p; hard reset completion\n",
 429                         __func__, iport);
 430
 431                 if (iport->hard_reset_status != SCI_SUCCESS)
 432                         ret = TMF_RESP_FUNC_FAILED;
 433         } else {
 434                 ret = TMF_RESP_FUNC_FAILED;
 435
 436                 dev_err(&ihost->pdev->dev,
 437                         "%s: iport = %p; scic_port_hard_reset call"
 438                         " failed 0x%x\n",
 439                         __func__, iport, status);
 440
 441         }
 442
 443         /* If the hard reset for the port has failed, consider this
 444          * the same as link failures on all phys in the port.
 445          */
 446         if (ret != TMF_RESP_FUNC_COMPLETE) {
 447                 dev_err(&ihost->pdev->dev,
 448                         "%s: iport = %p; hard reset failed "
 449                         "(0x%x) - sending link down to libsas for phy %p\n",
 450                         __func__, iport, iport->hard_reset_status, iphy);
 451
 452                 isci_port_link_down(ihost, iphy, iport);
 453         }
 454
 455         return ret;
 456 }
 457
 458 /**
 459  * isci_port_invalid_link_up() - This function informs the SCI Core user that
 460  *    a phy/link became ready, but the phy is not allowed in the port.  In some
 461  *    situations the underlying hardware only allows for certain phy to port
 462  *    mappings.  If these mappings are violated, then this API is invoked.
 463  * @controller: This parameter represents the controller which contains the
 464  *    port.
 465  * @port: This parameter specifies the SCI port object for which the callback
 466  *    is being invoked.
 467  * @phy: This parameter specifies the phy that came ready, but the phy can't be
 468  *    a valid member of the port.
 469  *
 470  */
 471 void isci_port_invalid_link_up(struct scic_sds_controller *scic,
 472                                       struct scic_sds_port *sci_port,
 473                                       struct scic_sds_phy *phy)
 474 {
 475         struct isci_host *ihost = sci_object_get_association(scic);
 476
 477         dev_warn(&ihost->pdev->dev, "Invalid link up!\n");
 478 }
 479
 480 void isci_port_stop_complete(struct scic_sds_controller *scic,
 481                                           struct scic_sds_port *sci_port,
 482                                           enum sci_status completion_status)
 483 {
 484         struct isci_host *ihost = sci_object_get_association(scic);
 485
 486         dev_dbg(&ihost->pdev->dev, "Port stop complete\n");
 487 }