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.
  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_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 sci_request_protocol {
  81         SCIC_NO_PROTOCOL,
  82         SCIC_SMP_PROTOCOL,
  83         SCIC_SSP_PROTOCOL,
  84         SCIC_STP_PROTOCOL
  85 }; /* XXX remove me, use sas_task.{dev|task_proto} instead */;
  86
  87 /**
  88  * isci_stp_request - extra request infrastructure to handle pio/atapi protocol
  89  * @pio_len - number of bytes requested at PIO setup
  90  * @status - pio setup ending status value to tell us if we need
  91  *           to wait for another fis or if the transfer is complete.  Upon
  92  *           receipt of a d2h fis this will be the status field of that fis.
  93  * @sgl - track pio transfer progress as we iterate through the sgl
  94  */
  95 struct isci_stp_request {
  96         u32 pio_len;
  97         u8 status;
  98
  99         struct isci_stp_pio_sgl {
 100                 int index;
 101                 u8 set;
 102                 u32 offset;
 103         } sgl;
 104 };
 105
 106 struct isci_request {
 107         enum isci_request_status status;
 108         #define IREQ_COMPLETE_IN_TARGET 0
 109         #define IREQ_TERMINATED 1
 110         #define IREQ_TMF 2
 111         #define IREQ_ACTIVE 3
 112         unsigned long flags;
 113         /* XXX kill ttype and ttype_ptr, allocate full sas_task */
 114         union ttype_ptr_union {
 115                 struct sas_task *io_task_ptr;   /* When ttype==io_task  */
 116                 struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
 117         } ttype_ptr;
 118         struct isci_host *isci_host;
 119         /* For use in the requests_to_{complete|abort} lists: */
 120         struct list_head completed_node;
 121         /* For use in the reqs_in_process list: */
 122         struct list_head dev_node;
 123         spinlock_t state_lock;
 124         dma_addr_t request_daddr;
 125         dma_addr_t zero_scatter_daddr;
 126         unsigned int num_sg_entries;
 127         /* Note: "io_request_completion" is completed in two different ways
 128          * depending on whether this is a TMF or regular request.
 129          * - TMF requests are completed in the thread that started them;
 130          * - regular requests are completed in the request completion callback
 131          *   function.
 132          * This difference in operation allows the aborter of a TMF request
 133          * to be sure that once the TMF request completes, the I/O that the
 134          * TMF was aborting is guaranteed to have completed.
 135          *
 136          * XXX kill io_request_completion
 137          */
 138         struct completion *io_request_completion;
 139         struct sci_base_state_machine sm;
 140         struct isci_host *owning_controller;
 141         struct isci_remote_device *target_device;
 142         u16 io_tag;
 143         enum sci_request_protocol protocol;
 144         u32 scu_status; /* hardware result */
 145         u32 sci_status; /* upper layer disposition */
 146         u32 post_context;
 147         struct scu_task_context *tc;
 148         /* could be larger with sg chaining */
 149         #define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
 150         struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
 151         /* This field is a pointer to the stored rx frame data.  It is used in
 152          * STP internal requests and SMP response frames.  If this field is
 153          * non-NULL the saved frame must be released on IO request completion.
 154          */
 155         u32 saved_rx_frame_index;
 156
 157         union {
 158                 struct {
 159                         union {
 160                                 struct ssp_cmd_iu cmd;
 161                                 struct ssp_task_iu tmf;
 162                         };
 163                         union {
 164                                 struct ssp_response_iu rsp;
 165                                 u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
 166                         };
 167                 } ssp;
 168                 struct {
 169                         struct isci_stp_request req;
 170                         struct host_to_dev_fis cmd;
 171                         struct dev_to_host_fis rsp;
 172                 } stp;
 173         };
 174 };
 175
 176 static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
 177 {
 178         struct isci_request *ireq;
 179
 180         ireq = container_of(stp_req, typeof(*ireq), stp.req);
 181         return ireq;
 182 }
 183
 184 /**
 185  * enum sci_base_request_states - request state machine states
 186  *
 187  * @SCI_REQ_INIT: Simply the initial state for the base request state machine.
 188  *
 189  * @SCI_REQ_CONSTRUCTED: This state indicates that the request has been
 190  * constructed.  This state is entered from the INITIAL state.
 191  *
 192  * @SCI_REQ_STARTED: This state indicates that the request has been started.
 193  * This state is entered from the CONSTRUCTED state.
 194  *
 195  * @SCI_REQ_STP_UDMA_WAIT_TC_COMP:
 196  * @SCI_REQ_STP_UDMA_WAIT_D2H:
 197  * @SCI_REQ_STP_NON_DATA_WAIT_H2D:
 198  * @SCI_REQ_STP_NON_DATA_WAIT_D2H:
 199  *
 200  * @SCI_REQ_STP_PIO_WAIT_H2D: While in this state the IO request object is
 201  * waiting for the TC completion notification for the H2D Register FIS
 202  *
 203  * @SCI_REQ_STP_PIO_WAIT_FRAME: While in this state the IO request object is
 204  * waiting for either a PIO Setup FIS or a D2H register FIS.  The type of frame
 205  * received is based on the result of the prior frame and line conditions.
 206  *
 207  * @SCI_REQ_STP_PIO_DATA_IN: While in this state the IO request object is
 208  * waiting for a DATA frame from the device.
 209  *
 210  * @SCI_REQ_STP_PIO_DATA_OUT: While in this state the IO request object is
 211  * waiting to transmit the next data frame to the device.
 212  *
 213  * @SCI_REQ_ATAPI_WAIT_H2D: While in this state the IO request object is
 214  * waiting for the TC completion notification for the H2D Register FIS
 215  *
 216  * @SCI_REQ_ATAPI_WAIT_PIO_SETUP: While in this state the IO request object is
 217  * waiting for either a PIO Setup.
 218  *
 219  * @SCI_REQ_ATAPI_WAIT_D2H: The non-data IO transit to this state in this state
 220  * after receiving TC completion. While in this state IO request object is
 221  * waiting for D2H status frame as UF.
 222  *
 223  * @SCI_REQ_ATAPI_WAIT_TC_COMP: When transmitting raw frames hardware reports
 224  * task context completion after every frame submission, so in the
 225  * non-accelerated case we need to expect the completion for the "cdb" frame.
 226  *
 227  * @SCI_REQ_TASK_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
 228  * the started raw task management request is waiting for the transmission of
 229  * the initial frame (i.e. command, task, etc.).
 230  *
 231  * @SCI_REQ_TASK_WAIT_TC_RESP: This sub-state indicates that the started task
 232  * management request is waiting for the reception of an unsolicited frame
 233  * (i.e.  response IU).
 234  *
 235  * @SCI_REQ_SMP_WAIT_RESP: This sub-state indicates that the started task
 236  * management request is waiting for the reception of an unsolicited frame
 237  * (i.e.  response IU).
 238  *
 239  * @SCI_REQ_SMP_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
 240  * the started SMP request is waiting for the transmission of the initial frame
 241  * (i.e.  command, task, etc.).
 242  *
 243  * @SCI_REQ_COMPLETED: This state indicates that the request has completed.
 244  * This state is entered from the STARTED state. This state is entered from the
 245  * ABORTING state.
 246  *
 247  * @SCI_REQ_ABORTING: This state indicates that the request is in the process
 248  * of being terminated/aborted.  This state is entered from the CONSTRUCTED
 249  * state.  This state is entered from the STARTED state.
 250  *
 251  * @SCI_REQ_FINAL: Simply the final state for the base request state machine.
 252  */
 253 #define REQUEST_STATES {\
 254         C(REQ_INIT),\
 255         C(REQ_CONSTRUCTED),\
 256         C(REQ_STARTED),\
 257         C(REQ_STP_UDMA_WAIT_TC_COMP),\
 258         C(REQ_STP_UDMA_WAIT_D2H),\
 259         C(REQ_STP_NON_DATA_WAIT_H2D),\
 260         C(REQ_STP_NON_DATA_WAIT_D2H),\
 261         C(REQ_STP_PIO_WAIT_H2D),\
 262         C(REQ_STP_PIO_WAIT_FRAME),\
 263         C(REQ_STP_PIO_DATA_IN),\
 264         C(REQ_STP_PIO_DATA_OUT),\
 265         C(REQ_ATAPI_WAIT_H2D),\
 266         C(REQ_ATAPI_WAIT_PIO_SETUP),\
 267         C(REQ_ATAPI_WAIT_D2H),\
 268         C(REQ_ATAPI_WAIT_TC_COMP),\
 269         C(REQ_TASK_WAIT_TC_COMP),\
 270         C(REQ_TASK_WAIT_TC_RESP),\
 271         C(REQ_SMP_WAIT_RESP),\
 272         C(REQ_SMP_WAIT_TC_COMP),\
 273         C(REQ_COMPLETED),\
 274         C(REQ_ABORTING),\
 275         C(REQ_FINAL),\
 276         }
 277 #undef C
 278 #define C(a) SCI_##a
 279 enum sci_base_request_states REQUEST_STATES;
 280 #undef C
 281 const char *req_state_name(enum sci_base_request_states state);
 282
 283 enum sci_status sci_request_start(struct isci_request *ireq);
 284 enum sci_status sci_io_request_terminate(struct isci_request *ireq);
 285 enum sci_status
 286 sci_io_request_event_handler(struct isci_request *ireq,
 287                                   u32 event_code);
 288 enum sci_status
 289 sci_io_request_frame_handler(struct isci_request *ireq,
 290                                   u32 frame_index);
 291 enum sci_status
 292 sci_task_request_terminate(struct isci_request *ireq);
 293 extern enum sci_status
 294 sci_request_complete(struct isci_request *ireq);
 295 extern enum sci_status
 296 sci_io_request_tc_completion(struct isci_request *ireq, u32 code);
 297
 298 /* XXX open code in caller */
 299 static inline dma_addr_t
 300 sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
 301 {
 302
 303         char *requested_addr = (char *)virt_addr;
 304         char *base_addr = (char *)ireq;
 305
 306         BUG_ON(requested_addr < base_addr);
 307         BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
 308
 309         return ireq->request_daddr + (requested_addr - base_addr);
 310 }
 311
 312 /**
 313  * isci_request_change_state() - This function sets the status of the request
 314  *    object.
 315  * @request: This parameter points to the isci_request object
 316  * @status: This Parameter is the new status of the object
 317  *
 318  */
 319 static inline enum isci_request_status
 320 isci_request_change_state(struct isci_request *isci_request,
 321                           enum isci_request_status status)
 322 {
 323         enum isci_request_status old_state;
 324         unsigned long flags;
 325
 326         dev_dbg(&isci_request->isci_host->pdev->dev,
 327                 "%s: isci_request = %p, state = 0x%x\n",
 328                 __func__,
 329                 isci_request,
 330                 status);
 331
 332         BUG_ON(isci_request == NULL);
 333
 334         spin_lock_irqsave(&isci_request->state_lock, flags);
 335         old_state = isci_request->status;
 336         isci_request->status = status;
 337         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 338
 339         return old_state;
 340 }
 341
 342 /**
 343  * isci_request_change_started_to_newstate() - This function sets the status of
 344  *    the request object.
 345  * @request: This parameter points to the isci_request object
 346  * @status: This Parameter is the new status of the object
 347  *
 348  * state previous to any change.
 349  */
 350 static inline enum isci_request_status
 351 isci_request_change_started_to_newstate(struct isci_request *isci_request,
 352                                         struct completion *completion_ptr,
 353                                         enum isci_request_status newstate)
 354 {
 355         enum isci_request_status old_state;
 356         unsigned long flags;
 357
 358         spin_lock_irqsave(&isci_request->state_lock, flags);
 359
 360         old_state = isci_request->status;
 361
 362         if (old_state == started || old_state == aborting) {
 363                 BUG_ON(isci_request->io_request_completion != NULL);
 364
 365                 isci_request->io_request_completion = completion_ptr;
 366                 isci_request->status = newstate;
 367         }
 368
 369         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 370
 371         dev_dbg(&isci_request->isci_host->pdev->dev,
 372                 "%s: isci_request = %p, old_state = 0x%x\n",
 373                 __func__,
 374                 isci_request,
 375                 old_state);
 376
 377         return old_state;
 378 }
 379
 380 /**
 381  * isci_request_change_started_to_aborted() - This function sets the status of
 382  *    the request object.
 383  * @request: This parameter points to the isci_request object
 384  * @completion_ptr: This parameter is saved as the kernel completion structure
 385  *    signalled when the old request completes.
 386  *
 387  * state previous to any change.
 388  */
 389 static inline enum isci_request_status
 390 isci_request_change_started_to_aborted(struct isci_request *isci_request,
 391                                        struct completion *completion_ptr)
 392 {
 393         return isci_request_change_started_to_newstate(isci_request,
 394                                                        completion_ptr,
 395                                                        aborted);
 396 }
 397
 398 #define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
 399
 400 #define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
 401
 402 struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
 403                                                struct isci_tmf *isci_tmf,
 404                                                u16 tag);
 405 int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
 406                          struct sas_task *task, u16 tag);
 407 void isci_terminate_pending_requests(struct isci_host *ihost,
 408                                      struct isci_remote_device *idev);
 409 enum sci_status
 410 sci_task_request_construct(struct isci_host *ihost,
 411                             struct isci_remote_device *idev,
 412                             u16 io_tag,
 413                             struct isci_request *ireq);
 414 enum sci_status sci_task_request_construct_ssp(struct isci_request *ireq);
 415 void sci_smp_request_copy_response(struct isci_request *ireq);
 416
 417 static inline int isci_task_is_ncq_recovery(struct sas_task *task)
 418 {
 419         return (sas_protocol_ata(task->task_proto) &&
 420                 task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
 421                 task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
 422
 423 }
 424
 425 #endif /* !defined(_ISCI_REQUEST_H_) */