drivers/scsi/isci/port.h

   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 #ifndef _ISCI_PORT_H_
  57 #define _ISCI_PORT_H_
  58
  59 #include <scsi/libsas.h>
  60 #include "isci.h"
  61 #include "sas.h"
  62 #include "phy.h"
  63
  64 #define SCIC_SDS_DUMMY_PORT   0xFF
  65
  66 struct isci_phy;
  67 struct isci_host;
  68
  69 enum isci_status {
  70         isci_freed        = 0x00,
  71         isci_starting     = 0x01,
  72         isci_ready        = 0x02,
  73         isci_ready_for_io = 0x03,
  74         isci_stopping     = 0x04,
  75         isci_stopped      = 0x05,
  76 };
  77
  78 /**
  79  * struct scic_sds_port
  80  *
  81  * The core port object provides the the abstraction for an SCU port.
  82  */
  83 struct scic_sds_port {
  84         /**
  85          * This field contains the information for the base port state machine.
  86          */
  87         struct sci_base_state_machine state_machine;
  88
  89         bool ready_exit;
  90
  91         /**
  92          * This field is the port index that is reported to the SCI USER.
  93          * This allows the actual hardware physical port to change without
  94          * the SCI USER getting a different answer for the get port index.
  95          */
  96         u8 logical_port_index;
  97
  98         /**
  99          * This field is the port index used to program the SCU hardware.
 100          */
 101         u8 physical_port_index;
 102
 103         /**
 104          * This field contains the active phy mask for the port.
 105          * This mask is used in conjunction with the phy state to determine
 106          * which phy to select for some port operations.
 107          */
 108         u8 active_phy_mask;
 109
 110         u16 reserved_rni;
 111         u16 reserved_tci;
 112
 113         /**
 114          * This field contains the count of the io requests started on this port
 115          * object.  It is used to control controller shutdown.
 116          */
 117         u32 started_request_count;
 118
 119         /**
 120          * This field contains the number of devices assigned to this port.
 121          * It is used to control port start requests.
 122          */
 123         u32 assigned_device_count;
 124
 125         /**
 126          * This field contains the reason for the port not going ready.  It is
 127          * assigned in the state handlers and used in the state transition.
 128          */
 129         u32 not_ready_reason;
 130
 131         /**
 132          * This field is the table of phys assigned to the port.
 133          */
 134         struct scic_sds_phy *phy_table[SCI_MAX_PHYS];
 135
 136         /**
 137          * This field is a pointer back to the controller that owns this
 138          * port object.
 139          */
 140         struct scic_sds_controller *owning_controller;
 141
 142         /**
 143          * This field contains the port start/stop timer handle.
 144          */
 145         void *timer_handle;
 146
 147         /**
 148          * This field points to the current set of state handlers for this port
 149          * object.  These state handlers are assigned at each enter state of
 150          * the state machine.
 151          */
 152         struct scic_sds_port_state_handler *state_handlers;
 153
 154         /* / Memory mapped hardware register space */
 155
 156         /**
 157          * This field is the pointer to the port task scheduler registers
 158          * for the SCU hardware.
 159          */
 160         struct scu_port_task_scheduler_registers __iomem
 161                 *port_task_scheduler_registers;
 162
 163         /**
 164          * This field is identical for all port objects and points to the port
 165          * task scheduler group PE configuration registers.
 166          * It is used to assign PEs to a port.
 167          */
 168         u32 __iomem *port_pe_configuration_register;
 169
 170         /**
 171          * This field is the VIIT register space for ths port object.
 172          */
 173         struct scu_viit_entry __iomem *viit_registers;
 174 };
 175
 176
 177
 178 /**
 179  * struct isci_port - This class represents the port object used to internally
 180  *    represent libsas port objects. It also keeps a list of remote device
 181  *    objects.
 182  *
 183  *
 184  */
 185 struct isci_port {
 186         enum isci_status status;
 187         struct isci_host *isci_host;
 188         struct asd_sas_port sas_port;
 189         struct list_head remote_dev_list;
 190         spinlock_t state_lock;
 191         struct list_head domain_dev_list;
 192         struct completion start_complete;
 193         struct completion hard_reset_complete;
 194         enum sci_status hard_reset_status;
 195         struct scic_sds_port sci;
 196 };
 197
 198 static inline struct isci_port *sci_port_to_iport(struct scic_sds_port *sci_port)
 199 {
 200         struct isci_port *iport = container_of(sci_port, typeof(*iport), sci);
 201
 202         return iport;
 203 }
 204
 205 enum scic_port_not_ready_reason_code {
 206         SCIC_PORT_NOT_READY_NO_ACTIVE_PHYS,
 207         SCIC_PORT_NOT_READY_HARD_RESET_REQUESTED,
 208         SCIC_PORT_NOT_READY_INVALID_PORT_CONFIGURATION,
 209         SCIC_PORT_NOT_READY_RECONFIGURING,
 210
 211         SCIC_PORT_NOT_READY_REASON_CODE_MAX
 212 };
 213
 214 struct scic_port_end_point_properties {
 215         struct sci_sas_address sas_address;
 216         struct scic_phy_proto protocols;
 217 };
 218
 219 struct scic_port_properties {
 220         u32 index;
 221         struct scic_port_end_point_properties local;
 222         struct scic_port_end_point_properties remote;
 223         u32 phy_mask;
 224 };
 225
 226 /**
 227  * enum scic_sds_port_states - This enumeration depicts all the states for the
 228  *    common port state machine.
 229  *
 230  *
 231  */
 232 enum scic_sds_port_states {
 233         /**
 234          * This state indicates that the port has successfully been stopped.
 235          * In this state no new IO operations are permitted.
 236          * This state is entered from the STOPPING state.
 237          */
 238         SCI_BASE_PORT_STATE_STOPPED,
 239
 240         /**
 241          * This state indicates that the port is in the process of stopping.
 242          * In this state no new IO operations are permitted, but existing IO
 243          * operations are allowed to complete.
 244          * This state is entered from the READY state.
 245          */
 246         SCI_BASE_PORT_STATE_STOPPING,
 247
 248         /**
 249          * This state indicates the port is now ready.  Thus, the user is
 250          * able to perform IO operations on this port.
 251          * This state is entered from the STARTING state.
 252          */
 253         SCI_BASE_PORT_STATE_READY,
 254
 255         /**
 256          * The substate where the port is started and ready but has no
 257          * active phys.
 258          */
 259         SCIC_SDS_PORT_READY_SUBSTATE_WAITING,
 260
 261         /**
 262          * The substate where the port is started and ready and there is
 263          * at least one phy operational.
 264          */
 265         SCIC_SDS_PORT_READY_SUBSTATE_OPERATIONAL,
 266
 267         /**
 268          * The substate where the port is started and there was an
 269          * add/remove phy event.  This state is only used in Automatic
 270          * Port Configuration Mode (APC)
 271          */
 272         SCIC_SDS_PORT_READY_SUBSTATE_CONFIGURING,
 273
 274         /**
 275          * This state indicates the port is in the process of performing a hard
 276          * reset.  Thus, the user is unable to perform IO operations on this
 277          * port.
 278          * This state is entered from the READY state.
 279          */
 280         SCI_BASE_PORT_STATE_RESETTING,
 281
 282         /**
 283          * This state indicates the port has failed a reset request.  This state
 284          * is entered when a port reset request times out.
 285          * This state is entered from the RESETTING state.
 286          */
 287         SCI_BASE_PORT_STATE_FAILED,
 288
 289         SCI_BASE_PORT_MAX_STATES
 290
 291 };
 292
 293 struct scic_sds_remote_device;
 294 struct scic_sds_request;
 295
 296 typedef enum sci_status (*scic_sds_port_handler_t)(struct scic_sds_port *);
 297
 298 typedef enum sci_status (*scic_sds_port_phy_handler_t)(struct scic_sds_port *,
 299                                                        struct scic_sds_phy *);
 300
 301 typedef enum sci_status (*scic_sds_port_reset_handler_t)(struct scic_sds_port *,
 302                                                          u32 timeout);
 303
 304 typedef enum sci_status (*scic_sds_port_event_handler_t)(struct scic_sds_port *, u32);
 305
 306 typedef enum sci_status (*scic_sds_port_frame_handler_t)(struct scic_sds_port *, u32);
 307
 308 typedef void (*scic_sds_port_link_handler_t)(struct scic_sds_port *, struct scic_sds_phy *);
 309
 310 typedef enum sci_status (*scic_sds_port_io_request_handler_t)(struct scic_sds_port *,
 311                                                               struct scic_sds_remote_device *,
 312                                                               struct scic_sds_request *);
 313
 314 struct scic_sds_port_state_handler {
 315         /**
 316          * The destruct_handler specifies the method invoked when attempting to
 317          * destruct a port.
 318          */
 319         scic_sds_port_handler_t destruct_handler;
 320
 321         /**
 322          * The reset_handler specifies the method invoked when a user
 323          * attempts to hard reset a port.
 324          */
 325         scic_sds_port_reset_handler_t reset_handler;
 326
 327         /**
 328          * The add_phy_handler specifies the method invoked when a user
 329          * attempts to add another phy into the port.
 330          */
 331         scic_sds_port_phy_handler_t add_phy_handler;
 332
 333         /**
 334          * The remove_phy_handler specifies the method invoked when a user
 335          * attempts to remove a phy from the port.
 336          */
 337         scic_sds_port_phy_handler_t remove_phy_handler;
 338
 339         scic_sds_port_frame_handler_t frame_handler;
 340         scic_sds_port_event_handler_t event_handler;
 341
 342         scic_sds_port_link_handler_t link_up_handler;
 343         scic_sds_port_link_handler_t link_down_handler;
 344
 345         scic_sds_port_io_request_handler_t start_io_handler;
 346         scic_sds_port_io_request_handler_t complete_io_handler;
 347
 348 };
 349
 350 /**
 351  * scic_sds_port_get_controller() -
 352  *
 353  * Helper macro to get the owning controller of this port
 354  */
 355 #define scic_sds_port_get_controller(this_port) \
 356         ((this_port)->owning_controller)
 357
 358 /**
 359  * scic_sds_port_set_base_state_handlers() -
 360  *
 361  * This macro will change the state handlers to those of the specified state id
 362  */
 363 #define scic_sds_port_set_base_state_handlers(this_port, state_id) \
 364         scic_sds_port_set_state_handlers(\
 365                 (this_port), &scic_sds_port_state_handler_table[(state_id)])
 366
 367 /**
 368  * scic_sds_port_set_state_handlers() -
 369  *
 370  * Helper macro to set the port object state handlers
 371  */
 372 #define scic_sds_port_set_state_handlers(this_port, handlers) \
 373         ((this_port)->state_handlers = (handlers))
 374
 375 /**
 376  * scic_sds_port_get_index() -
 377  *
 378  * This macro returns the physical port index for this port object
 379  */
 380 #define scic_sds_port_get_index(this_port) \
 381         ((this_port)->physical_port_index)
 382
 383
 384 static inline void scic_sds_port_decrement_request_count(struct scic_sds_port *sci_port)
 385 {
 386         if (WARN_ONCE(sci_port->started_request_count == 0,
 387                        "%s: tried to decrement started_request_count past 0!?",
 388                         __func__))
 389                 /* pass */;
 390         else
 391                 sci_port->started_request_count--;
 392 }
 393
 394 #define scic_sds_port_active_phy(port, phy) \
 395         (((port)->active_phy_mask & (1 << (phy)->phy_index)) != 0)
 396
 397 void scic_sds_port_construct(
 398         struct scic_sds_port *sci_port,
 399         u8 port_index,
 400         struct scic_sds_controller *scic);
 401
 402 enum sci_status scic_sds_port_initialize(
 403         struct scic_sds_port *sci_port,
 404         void __iomem *port_task_scheduler_registers,
 405         void __iomem *port_configuration_regsiter,
 406         void __iomem *viit_registers);
 407
 408 enum sci_status scic_sds_port_start(struct scic_sds_port *sci_port);
 409 enum sci_status scic_sds_port_stop(struct scic_sds_port *sci_port);
 410
 411 enum sci_status scic_sds_port_add_phy(
 412         struct scic_sds_port *sci_port,
 413         struct scic_sds_phy *sci_phy);
 414
 415 enum sci_status scic_sds_port_remove_phy(
 416         struct scic_sds_port *sci_port,
 417         struct scic_sds_phy *sci_phy);
 418
 419 void scic_sds_port_setup_transports(
 420         struct scic_sds_port *sci_port,
 421         u32 device_id);
 422
 423
 424 void scic_sds_port_deactivate_phy(
 425         struct scic_sds_port *sci_port,
 426         struct scic_sds_phy *sci_phy,
 427         bool do_notify_user);
 428
 429 bool scic_sds_port_link_detected(
 430         struct scic_sds_port *sci_port,
 431         struct scic_sds_phy *sci_phy);
 432
 433 void scic_sds_port_link_up(
 434         struct scic_sds_port *sci_port,
 435         struct scic_sds_phy *sci_phy);
 436
 437 void scic_sds_port_link_down(
 438         struct scic_sds_port *sci_port,
 439         struct scic_sds_phy *sci_phy);
 440
 441 enum sci_status scic_sds_port_start_io(
 442         struct scic_sds_port *sci_port,
 443         struct scic_sds_remote_device *sci_dev,
 444         struct scic_sds_request *sci_req);
 445
 446 enum sci_status scic_sds_port_complete_io(
 447         struct scic_sds_port *sci_port,
 448         struct scic_sds_remote_device *sci_dev,
 449         struct scic_sds_request *sci_req);
 450
 451 enum sas_linkrate scic_sds_port_get_max_allowed_speed(
 452         struct scic_sds_port *sci_port);
 453
 454 void scic_sds_port_broadcast_change_received(
 455         struct scic_sds_port *sci_port,
 456         struct scic_sds_phy *sci_phy);
 457
 458 bool scic_sds_port_is_valid_phy_assignment(
 459         struct scic_sds_port *sci_port,
 460         u32 phy_index);
 461
 462 void scic_sds_port_get_sas_address(
 463         struct scic_sds_port *sci_port,
 464         struct sci_sas_address *sas_address);
 465
 466 void scic_sds_port_get_attached_sas_address(
 467         struct scic_sds_port *sci_port,
 468         struct sci_sas_address *sas_address);
 469
 470 enum isci_status isci_port_get_state(
 471         struct isci_port *isci_port);
 472
 473 void isci_port_formed(struct asd_sas_phy *);
 474 void isci_port_deformed(struct asd_sas_phy *);
 475
 476 void isci_port_init(
 477         struct isci_port *port,
 478         struct isci_host *host,
 479         int index);
 480
 481 int isci_port_perform_hard_reset(struct isci_host *ihost, struct isci_port *iport,
 482                                  struct isci_phy *iphy);
 483 #endif /* !defined(_ISCI_PORT_H_) */