drivers/scsi/isci/request.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.
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  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_REQUEST_H_
  57 #define _ISCI_REQUEST_H_
  58
  59 #include "isci.h"
  60 #include "host.h"
  61 #include "scu_task_context.h"
  62
  63 /**
  64  * struct isci_request_status - This enum defines the possible states of an I/O
  65  *    request.
  66  *
  67  *
  68  */
  69 enum isci_request_status {
  70         unallocated = 0x00,
  71         allocated   = 0x01,
  72         started     = 0x02,
  73         completed   = 0x03,
  74         aborting    = 0x04,
  75         aborted     = 0x05,
  76         terminating = 0x06,
  77         dead        = 0x07
  78 };
  79
  80 enum task_type {
  81         io_task  = 0,
  82         tmf_task = 1
  83 };
  84
  85 enum sci_request_protocol {
  86         SCIC_NO_PROTOCOL,
  87         SCIC_SMP_PROTOCOL,
  88         SCIC_SSP_PROTOCOL,
  89         SCIC_STP_PROTOCOL
  90 }; /* XXX remove me, use sas_task.{dev|task_proto} instead */;
  91
  92 struct scic_sds_stp_request {
  93         union {
  94                 u32 ncq;
  95
  96                 u32 udma;
  97
  98                 struct scic_sds_stp_pio_request {
  99                         /**
 100                          * Total transfer for the entire PIO request recorded at request constuction
 101                          * time.
 102                          *
 103                          * @todo Should we just decrement this value for each byte of data transitted
 104                          *       or received to elemenate the current_transfer_bytes field?
 105                          */
 106                         u32 total_transfer_bytes;
 107
 108                         /**
 109                          * Total number of bytes received/transmitted in data frames since the start
 110                          * of the IO request.  At the end of the IO request this should equal the
 111                          * total_transfer_bytes.
 112                          */
 113                         u32 current_transfer_bytes;
 114
 115                         /**
 116                          * The number of bytes requested in the in the PIO setup.
 117                          */
 118                         u32 pio_transfer_bytes;
 119
 120                         /**
 121                          * PIO Setup ending status value to tell us if we need to wait for another FIS
 122                          * or if the transfer is complete. On the receipt of a D2H FIS this will be
 123                          * the status field of that FIS.
 124                          */
 125                         u8 ending_status;
 126
 127                         /**
 128                          * On receipt of a D2H FIS this will be the ending error field if the
 129                          * ending_status has the SATA_STATUS_ERR bit set.
 130                          */
 131                         u8 ending_error;
 132
 133                         struct scic_sds_request_pio_sgl {
 134                                 struct scu_sgl_element_pair *sgl_pair;
 135                                 u8 sgl_set;
 136                                 u32 sgl_offset;
 137                         } request_current;
 138                 } pio;
 139
 140                 struct {
 141                         /**
 142                          * The number of bytes requested in the PIO setup before CDB data frame.
 143                          */
 144                         u32 device_preferred_cdb_length;
 145                 } packet;
 146         } type;
 147 };
 148
 149 struct scic_sds_request {
 150         /**
 151          * This field contains the information for the base request state machine.
 152          */
 153         struct sci_base_state_machine state_machine;
 154
 155         /**
 156          * This field simply points to the controller to which this IO request
 157          * is associated.
 158          */
 159         struct scic_sds_controller *owning_controller;
 160
 161         /**
 162          * This field simply points to the remote device to which this IO request
 163          * is associated.
 164          */
 165         struct scic_sds_remote_device *target_device;
 166
 167         /**
 168          * This field is utilized to determine if the SCI user is managing
 169          * the IO tag for this request or if the core is managing it.
 170          */
 171         bool was_tag_assigned_by_user;
 172
 173         /**
 174          * This field indicates the IO tag for this request.  The IO tag is
 175          * comprised of the task_index and a sequence count. The sequence count
 176          * is utilized to help identify tasks from one life to another.
 177          */
 178         u16 io_tag;
 179
 180         /**
 181          * This field specifies the protocol being utilized for this
 182          * IO request.
 183          */
 184         enum sci_request_protocol protocol;
 185
 186         /**
 187          * This field indicates the completion status taken from the SCUs
 188          * completion code.  It indicates the completion result for the SCU hardware.
 189          */
 190         u32 scu_status;
 191
 192         /**
 193          * This field indicates the completion status returned to the SCI user.  It
 194          * indicates the users view of the io request completion.
 195          */
 196         u32 sci_status;
 197
 198         /**
 199          * This field contains the value to be utilized when posting (e.g. Post_TC,
 200          * Post_TC_Abort) this request to the silicon.
 201          */
 202         u32 post_context;
 203
 204         struct scu_task_context *task_context_buffer;
 205         struct scu_task_context tc ____cacheline_aligned;
 206
 207         /* could be larger with sg chaining */
 208         #define SCU_SGL_SIZE ((SCU_IO_REQUEST_SGE_COUNT + 1) / 2)
 209         struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
 210
 211         /**
 212          * This field indicates if this request is a task management request or
 213          * normal IO request.
 214          */
 215         bool is_task_management_request;
 216
 217         /**
 218          * This field is a pointer to the stored rx frame data.  It is used in STP
 219          * internal requests and SMP response frames.  If this field is non-NULL the
 220          * saved frame must be released on IO request completion.
 221          *
 222          * @todo In the future do we want to keep a list of RX frame buffers?
 223          */
 224         u32 saved_rx_frame_index;
 225
 226         /**
 227          * This field specifies the current state handlers in place for this
 228          * IO Request object.  This field is updated each time the request
 229          * changes state.
 230          */
 231         const struct scic_sds_io_request_state_handler *state_handlers;
 232
 233         /**
 234          * This field in the recorded device sequence for the io request.  This is
 235          * recorded during the build operation and is compared in the start
 236          * operation.  If the sequence is different then there was a change of
 237          * devices from the build to start operations.
 238          */
 239         u8 device_sequence;
 240
 241         union {
 242                 struct {
 243                         union {
 244                                 struct ssp_cmd_iu cmd;
 245                                 struct ssp_task_iu tmf;
 246                         };
 247                         union {
 248                                 struct ssp_response_iu rsp;
 249                                 u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
 250                         };
 251                 } ssp;
 252
 253                 struct {
 254                         struct smp_req cmd;
 255                         struct smp_resp rsp;
 256                 } smp;
 257
 258                 struct {
 259                         struct scic_sds_stp_request req;
 260                         struct host_to_dev_fis cmd;
 261                         struct dev_to_host_fis rsp;
 262                 } stp;
 263         };
 264
 265 };
 266
 267 static inline struct scic_sds_request *to_sci_req(struct scic_sds_stp_request *stp_req)
 268 {
 269         struct scic_sds_request *sci_req;
 270
 271         sci_req = container_of(stp_req, typeof(*sci_req), stp.req);
 272         return sci_req;
 273 }
 274
 275 struct isci_request {
 276         enum isci_request_status status;
 277         enum task_type ttype;
 278         unsigned short io_tag;
 279         bool complete_in_target;
 280         bool terminated;
 281
 282         union ttype_ptr_union {
 283                 struct sas_task *io_task_ptr;   /* When ttype==io_task  */
 284                 struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
 285         } ttype_ptr;
 286         struct isci_host *isci_host;
 287         struct isci_remote_device *isci_device;
 288         /* For use in the requests_to_{complete|abort} lists: */
 289         struct list_head completed_node;
 290         /* For use in the reqs_in_process list: */
 291         struct list_head dev_node;
 292         spinlock_t state_lock;
 293         dma_addr_t request_daddr;
 294         dma_addr_t zero_scatter_daddr;
 295
 296         unsigned int num_sg_entries;                    /* returned by pci_alloc_sg */
 297
 298         /** Note: "io_request_completion" is completed in two different ways
 299          * depending on whether this is a TMF or regular request.
 300          * - TMF requests are completed in the thread that started them;
 301          * - regular requests are completed in the request completion callback
 302          *   function.
 303          * This difference in operation allows the aborter of a TMF request
 304          * to be sure that once the TMF request completes, the I/O that the
 305          * TMF was aborting is guaranteed to have completed.
 306          */
 307         struct completion *io_request_completion;
 308         struct scic_sds_request sci;
 309 };
 310
 311 static inline struct isci_request *sci_req_to_ireq(struct scic_sds_request *sci_req)
 312 {
 313         struct isci_request *ireq = container_of(sci_req, typeof(*ireq), sci);
 314
 315         return ireq;
 316 }
 317
 318 /**
 319  * enum sci_base_request_states - This enumeration depicts all the states for
 320  *    the common request state machine.
 321  *
 322  *
 323  */
 324 enum sci_base_request_states {
 325         /**
 326          * Simply the initial state for the base request state machine.
 327          */
 328         SCI_BASE_REQUEST_STATE_INITIAL,
 329
 330         /**
 331          * This state indicates that the request has been constructed. This state
 332          * is entered from the INITIAL state.
 333          */
 334         SCI_BASE_REQUEST_STATE_CONSTRUCTED,
 335
 336         /**
 337          * This state indicates that the request has been started. This state is
 338          * entered from the CONSTRUCTED state.
 339          */
 340         SCI_BASE_REQUEST_STATE_STARTED,
 341
 342         SCIC_SDS_STP_REQUEST_STARTED_UDMA_AWAIT_TC_COMPLETION_SUBSTATE,
 343         SCIC_SDS_STP_REQUEST_STARTED_UDMA_AWAIT_D2H_REG_FIS_SUBSTATE,
 344
 345         SCIC_SDS_STP_REQUEST_STARTED_NON_DATA_AWAIT_H2D_COMPLETION_SUBSTATE,
 346         SCIC_SDS_STP_REQUEST_STARTED_NON_DATA_AWAIT_D2H_SUBSTATE,
 347
 348         SCIC_SDS_STP_REQUEST_STARTED_SOFT_RESET_AWAIT_H2D_ASSERTED_COMPLETION_SUBSTATE,
 349         SCIC_SDS_STP_REQUEST_STARTED_SOFT_RESET_AWAIT_H2D_DIAGNOSTIC_COMPLETION_SUBSTATE,
 350         SCIC_SDS_STP_REQUEST_STARTED_SOFT_RESET_AWAIT_D2H_RESPONSE_FRAME_SUBSTATE,
 351
 352         /**
 353          * While in this state the IO request object is waiting for the TC completion
 354          * notification for the H2D Register FIS
 355          */
 356         SCIC_SDS_STP_REQUEST_STARTED_PIO_AWAIT_H2D_COMPLETION_SUBSTATE,
 357
 358         /**
 359          * While in this state the IO request object is waiting for either a PIO Setup
 360          * FIS or a D2H register FIS.  The type of frame received is based on the
 361          * result of the prior frame and line conditions.
 362          */
 363         SCIC_SDS_STP_REQUEST_STARTED_PIO_AWAIT_FRAME_SUBSTATE,
 364
 365         /**
 366          * While in this state the IO request object is waiting for a DATA frame from
 367          * the device.
 368          */
 369         SCIC_SDS_STP_REQUEST_STARTED_PIO_DATA_IN_AWAIT_DATA_SUBSTATE,
 370
 371         /**
 372          * While in this state the IO request object is waiting to transmit the next data
 373          * frame to the device.
 374          */
 375         SCIC_SDS_STP_REQUEST_STARTED_PIO_DATA_OUT_TRANSMIT_DATA_SUBSTATE,
 376
 377         /**
 378          * The AWAIT_TC_COMPLETION sub-state indicates that the started raw
 379          * task management request is waiting for the transmission of the
 380          * initial frame (i.e. command, task, etc.).
 381          */
 382         SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION,
 383
 384         /**
 385          * This sub-state indicates that the started task management request
 386          * is waiting for the reception of an unsolicited frame
 387          * (i.e. response IU).
 388          */
 389         SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE,
 390
 391         /**
 392          * This sub-state indicates that the started task management request
 393          * is waiting for the reception of an unsolicited frame
 394          * (i.e. response IU).
 395          */
 396         SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE,
 397
 398         /**
 399          * The AWAIT_TC_COMPLETION sub-state indicates that the started SMP request is
 400          * waiting for the transmission of the initial frame (i.e. command, task, etc.).
 401          */
 402         SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION,
 403
 404         /**
 405          * This state indicates that the request has completed.
 406          * This state is entered from the STARTED state. This state is entered from
 407          * the ABORTING state.
 408          */
 409         SCI_BASE_REQUEST_STATE_COMPLETED,
 410
 411         /**
 412          * This state indicates that the request is in the process of being
 413          * terminated/aborted.
 414          * This state is entered from the CONSTRUCTED state.
 415          * This state is entered from the STARTED state.
 416          */
 417         SCI_BASE_REQUEST_STATE_ABORTING,
 418
 419         /**
 420          * Simply the final state for the base request state machine.
 421          */
 422         SCI_BASE_REQUEST_STATE_FINAL,
 423 };
 424
 425 typedef enum sci_status (*scic_sds_io_request_handler_t)
 426                                 (struct scic_sds_request *request);
 427 typedef enum sci_status (*scic_sds_io_request_event_handler_t)
 428                                 (struct scic_sds_request *req, u32 event);
 429 typedef enum sci_status (*scic_sds_io_request_task_completion_handler_t)
 430                                 (struct scic_sds_request *req, u32 completion_code);
 431
 432 /**
 433  * struct scic_sds_io_request_state_handler - This is the SDS core definition
 434  *    of the state handlers.
 435  *
 436  *
 437  */
 438 struct scic_sds_io_request_state_handler {
 439         /**
 440          * The complete_handler specifies the method invoked when a user attempts to
 441          * complete a request.
 442          */
 443         scic_sds_io_request_handler_t complete_handler;
 444
 445         scic_sds_io_request_task_completion_handler_t tc_completion_handler;
 446         scic_sds_io_request_event_handler_t event_handler;
 447 };
 448
 449 /**
 450  * scic_sds_request_get_controller() -
 451  *
 452  * This macro will return the controller for this io request object
 453  */
 454 #define scic_sds_request_get_controller(sci_req) \
 455         ((sci_req)->owning_controller)
 456
 457 /**
 458  * scic_sds_request_get_device() -
 459  *
 460  * This macro will return the device for this io request object
 461  */
 462 #define scic_sds_request_get_device(sci_req) \
 463         ((sci_req)->target_device)
 464
 465 /**
 466  * scic_sds_request_get_port() -
 467  *
 468  * This macro will return the port for this io request object
 469  */
 470 #define scic_sds_request_get_port(sci_req)      \
 471         scic_sds_remote_device_get_port(scic_sds_request_get_device(sci_req))
 472
 473 /**
 474  * scic_sds_request_get_post_context() -
 475  *
 476  * This macro returns the constructed post context result for the io request.
 477  */
 478 #define scic_sds_request_get_post_context(sci_req)      \
 479         ((sci_req)->post_context)
 480
 481 /**
 482  * scic_sds_request_get_task_context() -
 483  *
 484  * This is a helper macro to return the os handle for this request object.
 485  */
 486 #define scic_sds_request_get_task_context(request) \
 487         ((request)->task_context_buffer)
 488
 489 /**
 490  * scic_sds_request_set_status() -
 491  *
 492  * This macro will set the scu hardware status and sci request completion
 493  * status for an io request.
 494  */
 495 #define scic_sds_request_set_status(request, scu_status_code, sci_status_code) \
 496         { \
 497                 (request)->scu_status = (scu_status_code); \
 498                 (request)->sci_status = (sci_status_code); \
 499         }
 500
 501 #define scic_sds_request_complete(a_request) \
 502         ((a_request)->state_handlers->complete_handler(a_request))
 503
 504
 505 extern enum sci_status
 506 scic_sds_io_request_tc_completion(struct scic_sds_request *request, u32 completion_code);
 507
 508 /**
 509  * SCU_SGL_ZERO() -
 510  *
 511  * This macro zeros the hardware SGL element data
 512  */
 513 #define SCU_SGL_ZERO(scu_sge) \
 514         { \
 515                 (scu_sge).length = 0; \
 516                 (scu_sge).address_lower = 0; \
 517                 (scu_sge).address_upper = 0; \
 518                 (scu_sge).address_modifier = 0; \
 519         }
 520
 521 /**
 522  * SCU_SGL_COPY() -
 523  *
 524  * This macro copys the SGL Element data from the host os to the hardware SGL
 525  * elment data
 526  */
 527 #define SCU_SGL_COPY(scu_sge, os_sge) \
 528         { \
 529                 (scu_sge).length = sg_dma_len(sg); \
 530                 (scu_sge).address_upper = \
 531                         upper_32_bits(sg_dma_address(sg)); \
 532                 (scu_sge).address_lower = \
 533                         lower_32_bits(sg_dma_address(sg)); \
 534                 (scu_sge).address_modifier = 0; \
 535         }
 536
 537 enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req);
 538 enum sci_status scic_sds_io_request_terminate(struct scic_sds_request *sci_req);
 539 enum sci_status scic_sds_io_request_event_handler(struct scic_sds_request *sci_req,
 540                                                   u32 event_code);
 541 enum sci_status scic_sds_io_request_frame_handler(struct scic_sds_request *sci_req,
 542                                                   u32 frame_index);
 543 enum sci_status scic_sds_task_request_terminate(struct scic_sds_request *sci_req);
 544
 545 /* XXX open code in caller */
 546 static inline void *scic_request_get_virt_addr(struct scic_sds_request *sci_req,
 547                                                dma_addr_t phys_addr)
 548 {
 549         struct isci_request *ireq = sci_req_to_ireq(sci_req);
 550         dma_addr_t offset;
 551
 552         BUG_ON(phys_addr < ireq->request_daddr);
 553
 554         offset = phys_addr - ireq->request_daddr;
 555
 556         BUG_ON(offset >= sizeof(*ireq));
 557
 558         return (char *)ireq + offset;
 559 }
 560
 561 /* XXX open code in caller */
 562 static inline dma_addr_t scic_io_request_get_dma_addr(struct scic_sds_request *sci_req,
 563                                                       void *virt_addr)
 564 {
 565         struct isci_request *ireq = sci_req_to_ireq(sci_req);
 566
 567         char *requested_addr = (char *)virt_addr;
 568         char *base_addr = (char *)ireq;
 569
 570         BUG_ON(requested_addr < base_addr);
 571         BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
 572
 573         return ireq->request_daddr + (requested_addr - base_addr);
 574 }
 575
 576 /**
 577  * This function gets the status of the request object.
 578  * @request: This parameter points to the isci_request object
 579  *
 580  * status of the object as a isci_request_status enum.
 581  */
 582 static inline
 583 enum isci_request_status isci_request_get_state(
 584         struct isci_request *isci_request)
 585 {
 586         BUG_ON(isci_request == NULL);
 587
 588         /*probably a bad sign...        */
 589         if (isci_request->status == unallocated)
 590                 dev_warn(&isci_request->isci_host->pdev->dev,
 591                          "%s: isci_request->status == unallocated\n",
 592                          __func__);
 593
 594         return isci_request->status;
 595 }
 596
 597
 598 /**
 599  * isci_request_change_state() - This function sets the status of the request
 600  *    object.
 601  * @request: This parameter points to the isci_request object
 602  * @status: This Parameter is the new status of the object
 603  *
 604  */
 605 static inline enum isci_request_status isci_request_change_state(
 606         struct isci_request *isci_request,
 607         enum isci_request_status status)
 608 {
 609         enum isci_request_status old_state;
 610         unsigned long flags;
 611
 612         dev_dbg(&isci_request->isci_host->pdev->dev,
 613                 "%s: isci_request = %p, state = 0x%x\n",
 614                 __func__,
 615                 isci_request,
 616                 status);
 617
 618         BUG_ON(isci_request == NULL);
 619
 620         spin_lock_irqsave(&isci_request->state_lock, flags);
 621         old_state = isci_request->status;
 622         isci_request->status = status;
 623         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 624
 625         return old_state;
 626 }
 627
 628 /**
 629  * isci_request_change_started_to_newstate() - This function sets the status of
 630  *    the request object.
 631  * @request: This parameter points to the isci_request object
 632  * @status: This Parameter is the new status of the object
 633  *
 634  * state previous to any change.
 635  */
 636 static inline enum isci_request_status isci_request_change_started_to_newstate(
 637         struct isci_request *isci_request,
 638         struct completion *completion_ptr,
 639         enum isci_request_status newstate)
 640 {
 641         enum isci_request_status old_state;
 642         unsigned long flags;
 643
 644         spin_lock_irqsave(&isci_request->state_lock, flags);
 645
 646         old_state = isci_request->status;
 647
 648         if (old_state == started || old_state == aborting) {
 649                 BUG_ON(isci_request->io_request_completion != NULL);
 650
 651                 isci_request->io_request_completion = completion_ptr;
 652                 isci_request->status = newstate;
 653         }
 654         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 655
 656         dev_dbg(&isci_request->isci_host->pdev->dev,
 657                 "%s: isci_request = %p, old_state = 0x%x\n",
 658                 __func__,
 659                 isci_request,
 660                 old_state);
 661
 662         return old_state;
 663 }
 664
 665 /**
 666  * isci_request_change_started_to_aborted() - This function sets the status of
 667  *    the request object.
 668  * @request: This parameter points to the isci_request object
 669  * @completion_ptr: This parameter is saved as the kernel completion structure
 670  *    signalled when the old request completes.
 671  *
 672  * state previous to any change.
 673  */
 674 static inline enum isci_request_status isci_request_change_started_to_aborted(
 675         struct isci_request *isci_request,
 676         struct completion *completion_ptr)
 677 {
 678         return isci_request_change_started_to_newstate(
 679                        isci_request, completion_ptr, aborted
 680                        );
 681 }
 682 /**
 683  * isci_request_free() - This function frees the request object.
 684  * @isci_host: This parameter specifies the ISCI host object
 685  * @isci_request: This parameter points to the isci_request object
 686  *
 687  */
 688 static inline void isci_request_free(
 689         struct isci_host *isci_host,
 690         struct isci_request *isci_request)
 691 {
 692         if (!isci_request)
 693                 return;
 694
 695         /* release the dma memory if we fail. */
 696         dma_pool_free(isci_host->dma_pool, isci_request,
 697                       isci_request->request_daddr);
 698 }
 699
 700
 701 /* #define ISCI_REQUEST_VALIDATE_ACCESS
 702  */
 703
 704 #ifdef ISCI_REQUEST_VALIDATE_ACCESS
 705
 706 static inline
 707 struct sas_task *isci_request_access_task(struct isci_request *isci_request)
 708 {
 709         BUG_ON(isci_request->ttype != io_task);
 710         return isci_request->ttype_ptr.io_task_ptr;
 711 }
 712
 713 static inline
 714 struct isci_tmf *isci_request_access_tmf(struct isci_request *isci_request)
 715 {
 716         BUG_ON(isci_request->ttype != tmf_task);
 717         return isci_request->ttype_ptr.tmf_task_ptr;
 718 }
 719
 720 #else  /* not ISCI_REQUEST_VALIDATE_ACCESS */
 721
 722 #define isci_request_access_task(RequestPtr) \
 723         ((RequestPtr)->ttype_ptr.io_task_ptr)
 724
 725 #define isci_request_access_tmf(RequestPtr)  \
 726         ((RequestPtr)->ttype_ptr.tmf_task_ptr)
 727
 728 #endif /* not ISCI_REQUEST_VALIDATE_ACCESS */
 729
 730
 731 int isci_request_alloc_tmf(
 732         struct isci_host *isci_host,
 733         struct isci_tmf *isci_tmf,
 734         struct isci_request **isci_request,
 735         struct isci_remote_device *isci_device,
 736         gfp_t gfp_flags);
 737
 738
 739 int isci_request_execute(
 740         struct isci_host *isci_host,
 741         struct sas_task *task,
 742         struct isci_request **request,
 743         gfp_t gfp_flags);
 744
 745 /**
 746  * isci_request_unmap_sgl() - This function unmaps the DMA address of a given
 747  *    sgl
 748  * @request: This parameter points to the isci_request object
 749  * @*pdev: This Parameter is the pci_device struct for the controller
 750  *
 751  */
 752 static inline void isci_request_unmap_sgl(
 753         struct isci_request *request,
 754         struct pci_dev *pdev)
 755 {
 756         struct sas_task *task = isci_request_access_task(request);
 757
 758         dev_dbg(&request->isci_host->pdev->dev,
 759                 "%s: request = %p, task = %p,\n"
 760                 "task->data_dir = %d, is_sata = %d\n ",
 761                 __func__,
 762                 request,
 763                 task,
 764                 task->data_dir,
 765                 sas_protocol_ata(task->task_proto));
 766
 767         if ((task->data_dir != PCI_DMA_NONE) &&
 768             !sas_protocol_ata(task->task_proto)) {
 769                 if (task->num_scatter == 0)
 770                         /* 0 indicates a single dma address */
 771                         dma_unmap_single(
 772                                 &pdev->dev,
 773                                 request->zero_scatter_daddr,
 774                                 task->total_xfer_len,
 775                                 task->data_dir
 776                                 );
 777
 778                 else  /* unmap the sgl dma addresses */
 779                         dma_unmap_sg(
 780                                 &pdev->dev,
 781                                 task->scatter,
 782                                 request->num_sg_entries,
 783                                 task->data_dir
 784                                 );
 785         }
 786 }
 787
 788 /**
 789  * isci_request_io_request_get_next_sge() - This function is called by the sci
 790  *    core to retrieve the next sge for a given request.
 791  * @request: This parameter is the isci_request object.
 792  * @current_sge_address: This parameter is the last sge retrieved by the sci
 793  *    core for this request.
 794  *
 795  * pointer to the next sge for specified request.
 796  */
 797 static inline void *isci_request_io_request_get_next_sge(
 798         struct isci_request *request,
 799         void *current_sge_address)
 800 {
 801         struct sas_task *task = isci_request_access_task(request);
 802         void *ret = NULL;
 803
 804         dev_dbg(&request->isci_host->pdev->dev,
 805                 "%s: request = %p, "
 806                 "current_sge_address = %p, "
 807                 "num_scatter = %d\n",
 808                 __func__,
 809                 request,
 810                 current_sge_address,
 811                 task->num_scatter);
 812
 813         if (!current_sge_address)       /* First time through.. */
 814                 ret = task->scatter;    /* always task->scatter */
 815         else if (task->num_scatter == 0) /* Next element, if num_scatter == 0 */
 816                 ret = NULL;              /* there is only one element. */
 817         else
 818                 ret = sg_next(current_sge_address);     /* sg_next returns NULL
 819                                                          * for the last element
 820                                                          */
 821
 822         dev_dbg(&request->isci_host->pdev->dev,
 823                 "%s: next sge address = %p\n",
 824                 __func__,
 825                 ret);
 826
 827         return ret;
 828 }
 829
 830 void isci_terminate_pending_requests(struct isci_host *isci_host,
 831                                      struct isci_remote_device *isci_device,
 832                                      enum isci_request_status new_request_state);
 833 enum sci_status scic_task_request_construct(struct scic_sds_controller *scic,
 834                                             struct scic_sds_remote_device *sci_dev,
 835                                             u16 io_tag,
 836                                             struct scic_sds_request *sci_req);
 837 enum sci_status scic_task_request_construct_ssp(struct scic_sds_request *sci_req);
 838 enum sci_status scic_task_request_construct_sata(struct scic_sds_request *sci_req);
 839 void scic_stp_io_request_set_ncq_tag(struct scic_sds_request *sci_req, u16 ncq_tag);
 840 void scic_sds_smp_request_copy_response(struct scic_sds_request *sci_req);
 841 #endif /* !defined(_ISCI_REQUEST_H_) */