drivers/scsi/isci/port_config.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 #include "host.h"
  57 #include "timers.h"
  58
  59 #define SCIC_SDS_MPC_RECONFIGURATION_TIMEOUT    (10)
  60 #define SCIC_SDS_APC_RECONFIGURATION_TIMEOUT    (10)
  61 #define SCIC_SDS_APC_WAIT_LINK_UP_NOTIFICATION  (100)
  62
  63 enum SCIC_SDS_APC_ACTIVITY {
  64         SCIC_SDS_APC_SKIP_PHY,
  65         SCIC_SDS_APC_ADD_PHY,
  66         SCIC_SDS_APC_START_TIMER,
  67
  68         SCIC_SDS_APC_ACTIVITY_MAX
  69 };
  70
  71 /*
  72  * ******************************************************************************
  73  * General port configuration agent routines
  74  * ****************************************************************************** */
  75
  76 /**
  77  *
  78  * @address_one: A SAS Address to be compared.
  79  * @address_two: A SAS Address to be compared.
  80  *
  81  * Compare the two SAS Address and if SAS Address One is greater than SAS
  82  * Address Two then return > 0 else if SAS Address One is less than SAS Address
  83  * Two return < 0 Otherwise they are the same return 0 A signed value of x > 0
  84  * > y where x is returned for Address One > Address Two y is returned for
  85  * Address One < Address Two 0 is returned ofr Address One = Address Two
  86  */
  87 static s32 sci_sas_address_compare(
  88         struct sci_sas_address address_one,
  89         struct sci_sas_address address_two)
  90 {
  91         if (address_one.high > address_two.high) {
  92                 return 1;
  93         } else if (address_one.high < address_two.high) {
  94                 return -1;
  95         } else if (address_one.low > address_two.low) {
  96                 return 1;
  97         } else if (address_one.low < address_two.low) {
  98                 return -1;
  99         }
 100
 101         /* The two SAS Address must be identical */
 102         return 0;
 103 }
 104
 105 /**
 106  *
 107  * @controller: The controller object used for the port search.
 108  * @phy: The phy object to match.
 109  *
 110  * This routine will find a matching port for the phy.  This means that the
 111  * port and phy both have the same broadcast sas address and same received sas
 112  * address. The port address or the NULL if there is no matching
 113  * port. port address if the port can be found to match the phy.
 114  * NULL if there is no matching port for the phy.
 115  */
 116 static struct scic_sds_port *scic_sds_port_configuration_agent_find_port(
 117         struct scic_sds_controller *scic,
 118         struct scic_sds_phy *phy)
 119 {
 120         u8 i;
 121         struct sci_sas_address port_sas_address;
 122         struct sci_sas_address port_attached_device_address;
 123         struct sci_sas_address phy_sas_address;
 124         struct sci_sas_address phy_attached_device_address;
 125
 126         /*
 127          * Since this phy can be a member of a wide port check to see if one or
 128          * more phys match the sent and received SAS address as this phy in which
 129          * case it should participate in the same port.
 130          */
 131         scic_sds_phy_get_sas_address(phy, &phy_sas_address);
 132         scic_sds_phy_get_attached_sas_address(phy, &phy_attached_device_address);
 133
 134         for (i = 0; i < scic->logical_port_entries; i++) {
 135                 struct isci_host *ihost = scic_to_ihost(scic);
 136                 struct scic_sds_port *sci_port = &ihost->ports[i].sci;
 137
 138                 scic_sds_port_get_sas_address(sci_port, &port_sas_address);
 139                 scic_sds_port_get_attached_sas_address(sci_port, &port_attached_device_address);
 140
 141                 if (sci_sas_address_compare(port_sas_address, phy_sas_address) == 0 &&
 142                     sci_sas_address_compare(port_attached_device_address, phy_attached_device_address) == 0)
 143                         return sci_port;
 144         }
 145
 146         return NULL;
 147 }
 148
 149 /**
 150  *
 151  * @controller: This is the controller object that contains the port agent
 152  * @port_agent: This is the port configruation agent for the controller.
 153  *
 154  * This routine will validate the port configuration is correct for the SCU
 155  * hardware.  The SCU hardware allows for port configurations as follows. LP0
 156  * -> (PE0), (PE0, PE1), (PE0, PE1, PE2, PE3) LP1 -> (PE1) LP2 -> (PE2), (PE2,
 157  * PE3) LP3 -> (PE3) enum sci_status SCI_SUCCESS the port configuration is valid for
 158  * this port configuration agent. SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION
 159  * the port configuration is not valid for this port configuration agent.
 160  */
 161 static enum sci_status scic_sds_port_configuration_agent_validate_ports(
 162         struct scic_sds_controller *controller,
 163         struct scic_sds_port_configuration_agent *port_agent)
 164 {
 165         struct isci_host *ihost = scic_to_ihost(controller);
 166         struct sci_sas_address first_address;
 167         struct sci_sas_address second_address;
 168
 169         /*
 170          * Sanity check the max ranges for all the phys the max index
 171          * is always equal to the port range index */
 172         if (port_agent->phy_valid_port_range[0].max_index != 0 ||
 173             port_agent->phy_valid_port_range[1].max_index != 1 ||
 174             port_agent->phy_valid_port_range[2].max_index != 2 ||
 175             port_agent->phy_valid_port_range[3].max_index != 3)
 176                 return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 177
 178         /*
 179          * This is a request to configure a single x4 port or at least attempt
 180          * to make all the phys into a single port */
 181         if (port_agent->phy_valid_port_range[0].min_index == 0 &&
 182             port_agent->phy_valid_port_range[1].min_index == 0 &&
 183             port_agent->phy_valid_port_range[2].min_index == 0 &&
 184             port_agent->phy_valid_port_range[3].min_index == 0)
 185                 return SCI_SUCCESS;
 186
 187         /*
 188          * This is a degenerate case where phy 1 and phy 2 are assigned
 189          * to the same port this is explicitly disallowed by the hardware
 190          * unless they are part of the same x4 port and this condition was
 191          * already checked above. */
 192         if (port_agent->phy_valid_port_range[2].min_index == 1) {
 193                 return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 194         }
 195
 196         /*
 197          * PE0 and PE3 can never have the same SAS Address unless they
 198          * are part of the same x4 wide port and we have already checked
 199          * for this condition. */
 200         scic_sds_phy_get_sas_address(&ihost->phys[0].sci, &first_address);
 201         scic_sds_phy_get_sas_address(&ihost->phys[3].sci, &second_address);
 202
 203         if (sci_sas_address_compare(first_address, second_address) == 0) {
 204                 return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 205         }
 206
 207         /*
 208          * PE0 and PE1 are configured into a 2x1 ports make sure that the
 209          * SAS Address for PE0 and PE2 are different since they can not be
 210          * part of the same port. */
 211         if (port_agent->phy_valid_port_range[0].min_index == 0 &&
 212             port_agent->phy_valid_port_range[1].min_index == 1) {
 213                 scic_sds_phy_get_sas_address(&ihost->phys[0].sci, &first_address);
 214                 scic_sds_phy_get_sas_address(&ihost->phys[2].sci, &second_address);
 215
 216                 if (sci_sas_address_compare(first_address, second_address) == 0) {
 217                         return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 218                 }
 219         }
 220
 221         /*
 222          * PE2 and PE3 are configured into a 2x1 ports make sure that the
 223          * SAS Address for PE1 and PE3 are different since they can not be
 224          * part of the same port. */
 225         if (port_agent->phy_valid_port_range[2].min_index == 2 &&
 226             port_agent->phy_valid_port_range[3].min_index == 3) {
 227                 scic_sds_phy_get_sas_address(&ihost->phys[1].sci, &first_address);
 228                 scic_sds_phy_get_sas_address(&ihost->phys[3].sci, &second_address);
 229
 230                 if (sci_sas_address_compare(first_address, second_address) == 0) {
 231                         return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 232                 }
 233         }
 234
 235         return SCI_SUCCESS;
 236 }
 237
 238 /*
 239  * ******************************************************************************
 240  * Manual port configuration agent routines
 241  * ****************************************************************************** */
 242
 243 /**
 244  *
 245  *
 246  * This routine will verify that all of the phys in the same port are using the
 247  * same SAS address.
 248  */
 249 static enum sci_status scic_sds_mpc_agent_validate_phy_configuration(
 250         struct scic_sds_controller *controller,
 251         struct scic_sds_port_configuration_agent *port_agent)
 252 {
 253         struct isci_host *ihost = scic_to_ihost(controller);
 254         u32 phy_mask;
 255         u32 assigned_phy_mask;
 256         struct sci_sas_address sas_address;
 257         struct sci_sas_address phy_assigned_address;
 258         u8 port_index;
 259         u8 phy_index;
 260
 261         assigned_phy_mask = 0;
 262         sas_address.high = 0;
 263         sas_address.low = 0;
 264
 265         for (port_index = 0; port_index < SCI_MAX_PORTS; port_index++) {
 266                 phy_mask = controller->oem_parameters.sds1.ports[port_index].phy_mask;
 267
 268                 if (!phy_mask)
 269                         continue;
 270                 /*
 271                  * Make sure that one or more of the phys were not already assinged to
 272                  * a different port. */
 273                 if ((phy_mask & ~assigned_phy_mask) == 0) {
 274                         return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 275                 }
 276
 277                 /* Find the starting phy index for this round through the loop */
 278                 for (phy_index = 0; phy_index < SCI_MAX_PHYS; phy_index++) {
 279                         if ((phy_mask & (1 << phy_index)) == 0)
 280                                 continue;
 281                         scic_sds_phy_get_sas_address(&ihost->phys[phy_index].sci,
 282                                                      &sas_address);
 283
 284                         /*
 285                          * The phy_index can be used as the starting point for the
 286                          * port range since the hardware starts all logical ports
 287                          * the same as the PE index. */
 288                         port_agent->phy_valid_port_range[phy_index].min_index = port_index;
 289                         port_agent->phy_valid_port_range[phy_index].max_index = phy_index;
 290
 291                         if (phy_index != port_index) {
 292                                 return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 293                         }
 294
 295                         break;
 296                 }
 297
 298                 /*
 299                  * See how many additional phys are being added to this logical port.
 300                  * Note: We have not moved the current phy_index so we will actually
 301                  *       compare the startting phy with itself.
 302                  *       This is expected and required to add the phy to the port. */
 303                 while (phy_index < SCI_MAX_PHYS) {
 304                         if ((phy_mask & (1 << phy_index)) == 0)
 305                                 continue;
 306                         scic_sds_phy_get_sas_address(&ihost->phys[phy_index].sci,
 307                                                      &phy_assigned_address);
 308
 309                         if (sci_sas_address_compare(sas_address, phy_assigned_address) != 0) {
 310                                 /*
 311                                  * The phy mask specified that this phy is part of the same port
 312                                  * as the starting phy and it is not so fail this configuration */
 313                                 return SCI_FAILURE_UNSUPPORTED_PORT_CONFIGURATION;
 314                         }
 315
 316                         port_agent->phy_valid_port_range[phy_index].min_index = port_index;
 317                         port_agent->phy_valid_port_range[phy_index].max_index = phy_index;
 318
 319                         scic_sds_port_add_phy(&ihost->ports[port_index].sci,
 320                                               &ihost->phys[phy_index].sci);
 321
 322                         assigned_phy_mask |= (1 << phy_index);
 323                 }
 324
 325                 phy_index++;
 326         }
 327
 328         return scic_sds_port_configuration_agent_validate_ports(controller, port_agent);
 329 }
 330
 331 static void mpc_agent_timeout(unsigned long data)
 332 {
 333         u8 index;
 334         struct sci_timer *tmr = (struct sci_timer *)data;
 335         struct scic_sds_port_configuration_agent *port_agent;
 336         struct scic_sds_controller *scic;
 337         struct isci_host *ihost;
 338         unsigned long flags;
 339         u16 configure_phy_mask;
 340
 341         port_agent = container_of(tmr, typeof(*port_agent), timer);
 342         scic = container_of(port_agent, typeof(*scic), port_agent);
 343         ihost = scic_to_ihost(scic);
 344
 345         spin_lock_irqsave(&ihost->scic_lock, flags);
 346
 347         if (tmr->cancel)
 348                 goto done;
 349
 350         port_agent->timer_pending = false;
 351
 352         /* Find the mask of phys that are reported read but as yet unconfigured into a port */
 353         configure_phy_mask = ~port_agent->phy_configured_mask & port_agent->phy_ready_mask;
 354
 355         for (index = 0; index < SCI_MAX_PHYS; index++) {
 356                 struct scic_sds_phy *sci_phy = &ihost->phys[index].sci;
 357
 358                 if (configure_phy_mask & (1 << index)) {
 359                         port_agent->link_up_handler(scic, port_agent,
 360                                                     phy_get_non_dummy_port(sci_phy),
 361                                                     sci_phy);
 362                 }
 363         }
 364
 365 done:
 366         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 367 }
 368
 369 /**
 370  *
 371  * @controller: This is the controller object that receives the link up
 372  *    notification.
 373  * @port: This is the port object associated with the phy.  If the is no
 374  *    associated port this is an NULL.
 375  * @phy: This is the phy object which has gone ready.
 376  *
 377  * This method handles the manual port configuration link up notifications.
 378  * Since all ports and phys are associate at initialization time we just turn
 379  * around and notifiy the port object that there is a link up.  If this PHY is
 380  * not associated with a port there is no action taken. Is it possible to get a
 381  * link up notification from a phy that has no assocoated port?
 382  */
 383 static void scic_sds_mpc_agent_link_up(
 384         struct scic_sds_controller *controller,
 385         struct scic_sds_port_configuration_agent *port_agent,
 386         struct scic_sds_port *port,
 387         struct scic_sds_phy *phy)
 388 {
 389         /*
 390          * If the port has an invalid handle then the phy was not assigned to
 391          * a port.  This is because the phy was not given the same SAS Address
 392          * as the other PHYs in the port. */
 393         if (port != NULL) {
 394                 port_agent->phy_ready_mask |= (1 << scic_sds_phy_get_index(phy));
 395
 396                 scic_sds_port_link_up(port, phy);
 397
 398                 if ((port->active_phy_mask & (1 << scic_sds_phy_get_index(phy))) != 0) {
 399                         port_agent->phy_configured_mask |= (1 << scic_sds_phy_get_index(phy));
 400                 }
 401         }
 402 }
 403
 404 /**
 405  *
 406  * @controller: This is the controller object that receives the link down
 407  *    notification.
 408  * @port: This is the port object associated with the phy.  If the is no
 409  *    associated port this is an NULL.  The port is an invalid
 410  *    handle only if the phy was never port of this port.  This happens when
 411  *    the phy is not broadcasting the same SAS address as the other phys in the
 412  *    assigned port.
 413  * @phy: This is the phy object which has gone link down.
 414  *
 415  * This function handles the manual port configuration link down notifications.
 416  * Since all ports and phys are associated at initialization time we just turn
 417  * around and notifiy the port object of the link down event.  If this PHY is
 418  * not associated with a port there is no action taken. Is it possible to get a
 419  * link down notification from a phy that has no assocoated port?
 420  */
 421 static void scic_sds_mpc_agent_link_down(
 422         struct scic_sds_controller *scic,
 423         struct scic_sds_port_configuration_agent *port_agent,
 424         struct scic_sds_port *sci_port,
 425         struct scic_sds_phy *sci_phy)
 426 {
 427         if (sci_port != NULL) {
 428                 /*
 429                  * If we can form a new port from the remainder of the phys
 430                  * then we want to start the timer to allow the SCI User to
 431                  * cleanup old devices and rediscover the port before
 432                  * rebuilding the port with the phys that remain in the ready
 433                  * state.
 434                  */
 435                 port_agent->phy_ready_mask &=
 436                         ~(1 << scic_sds_phy_get_index(sci_phy));
 437                 port_agent->phy_configured_mask &=
 438                         ~(1 << scic_sds_phy_get_index(sci_phy));
 439
 440                 /*
 441                  * Check to see if there are more phys waiting to be
 442                  * configured into a port. If there are allow the SCI User
 443                  * to tear down this port, if necessary, and then reconstruct
 444                  * the port after the timeout.
 445                  */
 446                 if ((port_agent->phy_configured_mask == 0x0000) &&
 447                     (port_agent->phy_ready_mask != 0x0000) &&
 448                     !port_agent->timer_pending) {
 449                         port_agent->timer_pending = true;
 450
 451                         sci_mod_timer(&port_agent->timer,
 452                                       SCIC_SDS_MPC_RECONFIGURATION_TIMEOUT);
 453                 }
 454
 455                 scic_sds_port_link_down(sci_port, sci_phy);
 456         }
 457 }
 458
 459 /*
 460  * ******************************************************************************
 461  * Automatic port configuration agent routines
 462  * ****************************************************************************** */
 463
 464 /**
 465  *
 466  *
 467  * This routine will verify that the phys are assigned a valid SAS address for
 468  * automatic port configuration mode.
 469  */
 470 static enum sci_status scic_sds_apc_agent_validate_phy_configuration(
 471         struct scic_sds_controller *controller,
 472         struct scic_sds_port_configuration_agent *port_agent)
 473 {
 474         u8 phy_index;
 475         u8 port_index;
 476         struct sci_sas_address sas_address;
 477         struct sci_sas_address phy_assigned_address;
 478         struct isci_host *ihost = scic_to_ihost(controller);
 479
 480         phy_index = 0;
 481
 482         while (phy_index < SCI_MAX_PHYS) {
 483                 port_index = phy_index;
 484
 485                 /* Get the assigned SAS Address for the first PHY on the controller. */
 486                 scic_sds_phy_get_sas_address(&ihost->phys[phy_index].sci,
 487                                             &sas_address);
 488
 489                 while (++phy_index < SCI_MAX_PHYS) {
 490                         scic_sds_phy_get_sas_address(&ihost->phys[phy_index].sci,
 491                                                      &phy_assigned_address);
 492
 493                         /* Verify each of the SAS address are all the same for every PHY */
 494                         if (sci_sas_address_compare(sas_address, phy_assigned_address) == 0) {
 495                                 port_agent->phy_valid_port_range[phy_index].min_index = port_index;
 496                                 port_agent->phy_valid_port_range[phy_index].max_index = phy_index;
 497                         } else {
 498                                 port_agent->phy_valid_port_range[phy_index].min_index = phy_index;
 499                                 port_agent->phy_valid_port_range[phy_index].max_index = phy_index;
 500                                 break;
 501                         }
 502                 }
 503         }
 504
 505         return scic_sds_port_configuration_agent_validate_ports(controller, port_agent);
 506 }
 507
 508 /**
 509  *
 510  * @controller: This is the controller object that receives the link up
 511  *    notification.
 512  * @phy: This is the phy object which has gone link up.
 513  *
 514  * This method handles the automatic port configuration for link up
 515  * notifications.
 516  */
 517 static void scic_sds_apc_agent_configure_ports(
 518         struct scic_sds_controller *controller,
 519         struct scic_sds_port_configuration_agent *port_agent,
 520         struct scic_sds_phy *phy,
 521         bool start_timer)
 522 {
 523         u8 port_index;
 524         enum sci_status status;
 525         struct scic_sds_port *port;
 526         enum SCIC_SDS_APC_ACTIVITY apc_activity = SCIC_SDS_APC_SKIP_PHY;
 527         struct isci_host *ihost = scic_to_ihost(controller);
 528
 529         port = scic_sds_port_configuration_agent_find_port(controller, phy);
 530
 531         if (port != NULL) {
 532                 if (scic_sds_port_is_valid_phy_assignment(port, phy->phy_index))
 533                         apc_activity = SCIC_SDS_APC_ADD_PHY;
 534                 else
 535                         apc_activity = SCIC_SDS_APC_SKIP_PHY;
 536         } else {
 537                 /*
 538                  * There is no matching Port for this PHY so lets search through the
 539                  * Ports and see if we can add the PHY to its own port or maybe start
 540                  * the timer and wait to see if a wider port can be made.
 541                  *
 542                  * Note the break when we reach the condition of the port id == phy id */
 543                 for (
 544                         port_index = port_agent->phy_valid_port_range[phy->phy_index].min_index;
 545                         port_index <= port_agent->phy_valid_port_range[phy->phy_index].max_index;
 546                         port_index++
 547                         ) {
 548
 549                         port = &ihost->ports[port_index].sci;
 550
 551                         /* First we must make sure that this PHY can be added to this Port. */
 552                         if (scic_sds_port_is_valid_phy_assignment(port, phy->phy_index)) {
 553                                 /*
 554                                  * Port contains a PHY with a greater PHY ID than the current
 555                                  * PHY that has gone link up.  This phy can not be part of any
 556                                  * port so skip it and move on. */
 557                                 if (port->active_phy_mask > (1 << phy->phy_index)) {
 558                                         apc_activity = SCIC_SDS_APC_SKIP_PHY;
 559                                         break;
 560                                 }
 561
 562                                 /*
 563                                  * We have reached the end of our Port list and have not found
 564                                  * any reason why we should not either add the PHY to the port
 565                                  * or wait for more phys to become active. */
 566                                 if (port->physical_port_index == phy->phy_index) {
 567                                         /*
 568                                          * The Port either has no active PHYs.
 569                                          * Consider that if the port had any active PHYs we would have
 570                                          * or active PHYs with
 571                                          * a lower PHY Id than this PHY. */
 572                                         if (apc_activity != SCIC_SDS_APC_START_TIMER) {
 573                                                 apc_activity = SCIC_SDS_APC_ADD_PHY;
 574                                         }
 575
 576                                         break;
 577                                 }
 578
 579                                 /*
 580                                  * The current Port has no active PHYs and this PHY could be part
 581                                  * of this Port.  Since we dont know as yet setup to start the
 582                                  * timer and see if there is a better configuration. */
 583                                 if (port->active_phy_mask == 0) {
 584                                         apc_activity = SCIC_SDS_APC_START_TIMER;
 585                                 }
 586                         } else if (port->active_phy_mask != 0) {
 587                                 /*
 588                                  * The Port has an active phy and the current Phy can not
 589                                  * participate in this port so skip the PHY and see if
 590                                  * there is a better configuration. */
 591                                 apc_activity = SCIC_SDS_APC_SKIP_PHY;
 592                         }
 593                 }
 594         }
 595
 596         /*
 597          * Check to see if the start timer operations should instead map to an
 598          * add phy operation.  This is caused because we have been waiting to
 599          * add a phy to a port but could not becuase the automatic port
 600          * configuration engine had a choice of possible ports for the phy.
 601          * Since we have gone through a timeout we are going to restrict the
 602          * choice to the smallest possible port. */
 603         if (
 604                 (start_timer == false)
 605                 && (apc_activity == SCIC_SDS_APC_START_TIMER)
 606                 ) {
 607                 apc_activity = SCIC_SDS_APC_ADD_PHY;
 608         }
 609
 610         switch (apc_activity) {
 611         case SCIC_SDS_APC_ADD_PHY:
 612                 status = scic_sds_port_add_phy(port, phy);
 613
 614                 if (status == SCI_SUCCESS) {
 615                         port_agent->phy_configured_mask |= (1 << phy->phy_index);
 616                 }
 617                 break;
 618
 619         case SCIC_SDS_APC_START_TIMER:
 620                 /*
 621                  * This can occur for either a link down event, or a link
 622                  * up event where we cannot yet tell the port to which a
 623                  * phy belongs.
 624                  */
 625                 if (port_agent->timer_pending)
 626                         sci_del_timer(&port_agent->timer);
 627
 628                 port_agent->timer_pending = true;
 629                 sci_mod_timer(&port_agent->timer,
 630                               SCIC_SDS_APC_WAIT_LINK_UP_NOTIFICATION);
 631                 break;
 632
 633         case SCIC_SDS_APC_SKIP_PHY:
 634         default:
 635                 /* do nothing the PHY can not be made part of a port at this time. */
 636                 break;
 637         }
 638 }
 639
 640 /**
 641  * scic_sds_apc_agent_link_up - handle apc link up events
 642  * @scic: This is the controller object that receives the link up
 643  *    notification.
 644  * @sci_port: This is the port object associated with the phy.  If the is no
 645  *    associated port this is an NULL.
 646  * @sci_phy: This is the phy object which has gone link up.
 647  *
 648  * This method handles the automatic port configuration for link up
 649  * notifications. Is it possible to get a link down notification from a phy
 650  * that has no assocoated port?
 651  */
 652 static void scic_sds_apc_agent_link_up(struct scic_sds_controller *scic,
 653                                        struct scic_sds_port_configuration_agent *port_agent,
 654                                        struct scic_sds_port *sci_port,
 655                                        struct scic_sds_phy *sci_phy)
 656 {
 657         u8 phy_index  = sci_phy->phy_index;
 658
 659         if (!sci_port) {
 660                 /* the phy is not the part of this port */
 661                 port_agent->phy_ready_mask |= 1 << phy_index;
 662                 scic_sds_apc_agent_configure_ports(scic, port_agent, sci_phy, true);
 663         } else {
 664                 /* the phy is already the part of the port */
 665                 u32 port_state = sci_port->state_machine.current_state_id;
 666
 667                 /* if the PORT'S state is resetting then the link up is from
 668                  * port hard reset in this case, we need to tell the port
 669                  * that link up is recieved
 670                  */
 671                 BUG_ON(port_state != SCI_BASE_PORT_STATE_RESETTING);
 672                 port_agent->phy_ready_mask |= 1 << phy_index;
 673                 scic_sds_port_link_up(sci_port, sci_phy);
 674         }
 675 }
 676
 677 /**
 678  *
 679  * @controller: This is the controller object that receives the link down
 680  *    notification.
 681  * @port: This is the port object associated with the phy.  If the is no
 682  *    associated port this is an NULL.
 683  * @phy: This is the phy object which has gone link down.
 684  *
 685  * This method handles the automatic port configuration link down
 686  * notifications. not associated with a port there is no action taken. Is it
 687  * possible to get a link down notification from a phy that has no assocoated
 688  * port?
 689  */
 690 static void scic_sds_apc_agent_link_down(
 691         struct scic_sds_controller *controller,
 692         struct scic_sds_port_configuration_agent *port_agent,
 693         struct scic_sds_port *port,
 694         struct scic_sds_phy *phy)
 695 {
 696         port_agent->phy_ready_mask &= ~(1 << scic_sds_phy_get_index(phy));
 697
 698         if (port != NULL) {
 699                 if (port_agent->phy_configured_mask & (1 << phy->phy_index)) {
 700                         enum sci_status status;
 701
 702                         status = scic_sds_port_remove_phy(port, phy);
 703
 704                         if (status == SCI_SUCCESS) {
 705                                 port_agent->phy_configured_mask &= ~(1 << phy->phy_index);
 706                         }
 707                 }
 708         }
 709 }
 710
 711 /* configure the phys into ports when the timer fires */
 712 static void apc_agent_timeout(unsigned long data)
 713 {
 714         u32 index;
 715         struct sci_timer *tmr = (struct sci_timer *)data;
 716         struct scic_sds_port_configuration_agent *port_agent;
 717         struct scic_sds_controller *scic;
 718         struct isci_host *ihost;
 719         unsigned long flags;
 720         u16 configure_phy_mask;
 721
 722         port_agent = container_of(tmr, typeof(*port_agent), timer);
 723         scic = container_of(port_agent, typeof(*scic), port_agent);
 724         ihost = scic_to_ihost(scic);
 725
 726         spin_lock_irqsave(&ihost->scic_lock, flags);
 727
 728         if (tmr->cancel)
 729                 goto done;
 730
 731         port_agent->timer_pending = false;
 732
 733         configure_phy_mask = ~port_agent->phy_configured_mask & port_agent->phy_ready_mask;
 734
 735         if (!configure_phy_mask)
 736                 return;
 737
 738         for (index = 0; index < SCI_MAX_PHYS; index++) {
 739                 if ((configure_phy_mask & (1 << index)) == 0)
 740                         continue;
 741
 742                 scic_sds_apc_agent_configure_ports(scic, port_agent,
 743                                                    &ihost->phys[index].sci, false);
 744         }
 745
 746 done:
 747         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 748 }
 749
 750 /*
 751  * ******************************************************************************
 752  * Public port configuration agent routines
 753  * ****************************************************************************** */
 754
 755 /**
 756  *
 757  *
 758  * This method will construct the port configuration agent for operation. This
 759  * call is universal for both manual port configuration and automatic port
 760  * configuration modes.
 761  */
 762 void scic_sds_port_configuration_agent_construct(
 763         struct scic_sds_port_configuration_agent *port_agent)
 764 {
 765         u32 index;
 766
 767         port_agent->phy_configured_mask = 0x00;
 768         port_agent->phy_ready_mask = 0x00;
 769
 770         port_agent->link_up_handler = NULL;
 771         port_agent->link_down_handler = NULL;
 772
 773         port_agent->timer_pending = false;
 774
 775         for (index = 0; index < SCI_MAX_PORTS; index++) {
 776                 port_agent->phy_valid_port_range[index].min_index = 0;
 777                 port_agent->phy_valid_port_range[index].max_index = 0;
 778         }
 779 }
 780
 781 enum sci_status scic_sds_port_configuration_agent_initialize(
 782         struct scic_sds_controller *scic,
 783         struct scic_sds_port_configuration_agent *port_agent)
 784 {
 785         enum sci_status status;
 786         enum scic_port_configuration_mode mode;
 787
 788         mode = scic->oem_parameters.sds1.controller.mode_type;
 789
 790         if (mode == SCIC_PORT_MANUAL_CONFIGURATION_MODE) {
 791                 status = scic_sds_mpc_agent_validate_phy_configuration(
 792                                 scic, port_agent);
 793
 794                 port_agent->link_up_handler = scic_sds_mpc_agent_link_up;
 795                 port_agent->link_down_handler = scic_sds_mpc_agent_link_down;
 796
 797                 sci_init_timer(&port_agent->timer, mpc_agent_timeout);
 798         } else {
 799                 status = scic_sds_apc_agent_validate_phy_configuration(
 800                                 scic, port_agent);
 801
 802                 port_agent->link_up_handler = scic_sds_apc_agent_link_up;
 803                 port_agent->link_down_handler = scic_sds_apc_agent_link_down;
 804
 805                 sci_init_timer(&port_agent->timer, apc_agent_timeout);
 806         }
 807
 808         return status;
 809 }