drivers/scsi/isci/request.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 "isci.h"
  57 #include "task.h"
  58 #include "request.h"
  59 #include "scu_completion_codes.h"
  60 #include "scu_event_codes.h"
  61 #include "sas.h"
  62
  63 static struct scu_sgl_element_pair *to_sgl_element_pair(struct isci_request *ireq,
  64                                                         int idx)
  65 {
  66         if (idx == 0)
  67                 return &ireq->tc->sgl_pair_ab;
  68         else if (idx == 1)
  69                 return &ireq->tc->sgl_pair_cd;
  70         else if (idx < 0)
  71                 return NULL;
  72         else
  73                 return &ireq->sg_table[idx - 2];
  74 }
  75
  76 static dma_addr_t to_sgl_element_pair_dma(struct isci_host *ihost,
  77                                           struct isci_request *ireq, u32 idx)
  78 {
  79         u32 offset;
  80
  81         if (idx == 0) {
  82                 offset = (void *) &ireq->tc->sgl_pair_ab -
  83                          (void *) &ihost->task_context_table[0];
  84                 return ihost->task_context_dma + offset;
  85         } else if (idx == 1) {
  86                 offset = (void *) &ireq->tc->sgl_pair_cd -
  87                          (void *) &ihost->task_context_table[0];
  88                 return ihost->task_context_dma + offset;
  89         }
  90
  91         return sci_io_request_get_dma_addr(ireq, &ireq->sg_table[idx - 2]);
  92 }
  93
  94 static void init_sgl_element(struct scu_sgl_element *e, struct scatterlist *sg)
  95 {
  96         e->length = sg_dma_len(sg);
  97         e->address_upper = upper_32_bits(sg_dma_address(sg));
  98         e->address_lower = lower_32_bits(sg_dma_address(sg));
  99         e->address_modifier = 0;
 100 }
 101
 102 static void sci_request_build_sgl(struct isci_request *ireq)
 103 {
 104         struct isci_host *ihost = ireq->isci_host;
 105         struct sas_task *task = isci_request_access_task(ireq);
 106         struct scatterlist *sg = NULL;
 107         dma_addr_t dma_addr;
 108         u32 sg_idx = 0;
 109         struct scu_sgl_element_pair *scu_sg   = NULL;
 110         struct scu_sgl_element_pair *prev_sg  = NULL;
 111
 112         if (task->num_scatter > 0) {
 113                 sg = task->scatter;
 114
 115                 while (sg) {
 116                         scu_sg = to_sgl_element_pair(ireq, sg_idx);
 117                         init_sgl_element(&scu_sg->A, sg);
 118                         sg = sg_next(sg);
 119                         if (sg) {
 120                                 init_sgl_element(&scu_sg->B, sg);
 121                                 sg = sg_next(sg);
 122                         } else
 123                                 memset(&scu_sg->B, 0, sizeof(scu_sg->B));
 124
 125                         if (prev_sg) {
 126                                 dma_addr = to_sgl_element_pair_dma(ihost,
 127                                                                    ireq,
 128                                                                    sg_idx);
 129
 130                                 prev_sg->next_pair_upper =
 131                                         upper_32_bits(dma_addr);
 132                                 prev_sg->next_pair_lower =
 133                                         lower_32_bits(dma_addr);
 134                         }
 135
 136                         prev_sg = scu_sg;
 137                         sg_idx++;
 138                 }
 139         } else {        /* handle when no sg */
 140                 scu_sg = to_sgl_element_pair(ireq, sg_idx);
 141
 142                 dma_addr = dma_map_single(&ihost->pdev->dev,
 143                                           task->scatter,
 144                                           task->total_xfer_len,
 145                                           task->data_dir);
 146
 147                 ireq->zero_scatter_daddr = dma_addr;
 148
 149                 scu_sg->A.length = task->total_xfer_len;
 150                 scu_sg->A.address_upper = upper_32_bits(dma_addr);
 151                 scu_sg->A.address_lower = lower_32_bits(dma_addr);
 152         }
 153
 154         if (scu_sg) {
 155                 scu_sg->next_pair_upper = 0;
 156                 scu_sg->next_pair_lower = 0;
 157         }
 158 }
 159
 160 static void sci_io_request_build_ssp_command_iu(struct isci_request *ireq)
 161 {
 162         struct ssp_cmd_iu *cmd_iu;
 163         struct sas_task *task = isci_request_access_task(ireq);
 164
 165         cmd_iu = &ireq->ssp.cmd;
 166
 167         memcpy(cmd_iu->LUN, task->ssp_task.LUN, 8);
 168         cmd_iu->add_cdb_len = 0;
 169         cmd_iu->_r_a = 0;
 170         cmd_iu->_r_b = 0;
 171         cmd_iu->en_fburst = 0; /* unsupported */
 172         cmd_iu->task_prio = task->ssp_task.task_prio;
 173         cmd_iu->task_attr = task->ssp_task.task_attr;
 174         cmd_iu->_r_c = 0;
 175
 176         sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb,
 177                        sizeof(task->ssp_task.cdb) / sizeof(u32));
 178 }
 179
 180 static void sci_task_request_build_ssp_task_iu(struct isci_request *ireq)
 181 {
 182         struct ssp_task_iu *task_iu;
 183         struct sas_task *task = isci_request_access_task(ireq);
 184         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
 185
 186         task_iu = &ireq->ssp.tmf;
 187
 188         memset(task_iu, 0, sizeof(struct ssp_task_iu));
 189
 190         memcpy(task_iu->LUN, task->ssp_task.LUN, 8);
 191
 192         task_iu->task_func = isci_tmf->tmf_code;
 193         task_iu->task_tag =
 194                 (test_bit(IREQ_TMF, &ireq->flags)) ?
 195                 isci_tmf->io_tag :
 196                 SCI_CONTROLLER_INVALID_IO_TAG;
 197 }
 198
 199 /**
 200  * This method is will fill in the SCU Task Context for any type of SSP request.
 201  * @sci_req:
 202  * @task_context:
 203  *
 204  */
 205 static void scu_ssp_reqeust_construct_task_context(
 206         struct isci_request *ireq,
 207         struct scu_task_context *task_context)
 208 {
 209         dma_addr_t dma_addr;
 210         struct isci_remote_device *idev;
 211         struct isci_port *iport;
 212
 213         idev = ireq->target_device;
 214         iport = idev->owning_port;
 215
 216         /* Fill in the TC with the its required data */
 217         task_context->abort = 0;
 218         task_context->priority = 0;
 219         task_context->initiator_request = 1;
 220         task_context->connection_rate = idev->connection_rate;
 221         task_context->protocol_engine_index = ISCI_PEG;
 222         task_context->logical_port_index = iport->physical_port_index;
 223         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
 224         task_context->valid = SCU_TASK_CONTEXT_VALID;
 225         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
 226
 227         task_context->remote_node_index = idev->rnc.remote_node_index;
 228         task_context->command_code = 0;
 229
 230         task_context->link_layer_control = 0;
 231         task_context->do_not_dma_ssp_good_response = 1;
 232         task_context->strict_ordering = 0;
 233         task_context->control_frame = 0;
 234         task_context->timeout_enable = 0;
 235         task_context->block_guard_enable = 0;
 236
 237         task_context->address_modifier = 0;
 238
 239         /* task_context->type.ssp.tag = ireq->io_tag; */
 240         task_context->task_phase = 0x01;
 241
 242         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 243                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 244                               (iport->physical_port_index <<
 245                                SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
 246                               ISCI_TAG_TCI(ireq->io_tag));
 247
 248         /*
 249          * Copy the physical address for the command buffer to the
 250          * SCU Task Context
 251          */
 252         dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.cmd);
 253
 254         task_context->command_iu_upper = upper_32_bits(dma_addr);
 255         task_context->command_iu_lower = lower_32_bits(dma_addr);
 256
 257         /*
 258          * Copy the physical address for the response buffer to the
 259          * SCU Task Context
 260          */
 261         dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.rsp);
 262
 263         task_context->response_iu_upper = upper_32_bits(dma_addr);
 264         task_context->response_iu_lower = lower_32_bits(dma_addr);
 265 }
 266
 267 /**
 268  * This method is will fill in the SCU Task Context for a SSP IO request.
 269  * @sci_req:
 270  *
 271  */
 272 static void scu_ssp_io_request_construct_task_context(struct isci_request *ireq,
 273                                                       enum dma_data_direction dir,
 274                                                       u32 len)
 275 {
 276         struct scu_task_context *task_context = ireq->tc;
 277
 278         scu_ssp_reqeust_construct_task_context(ireq, task_context);
 279
 280         task_context->ssp_command_iu_length =
 281                 sizeof(struct ssp_cmd_iu) / sizeof(u32);
 282         task_context->type.ssp.frame_type = SSP_COMMAND;
 283
 284         switch (dir) {
 285         case DMA_FROM_DEVICE:
 286         case DMA_NONE:
 287         default:
 288                 task_context->task_type = SCU_TASK_TYPE_IOREAD;
 289                 break;
 290         case DMA_TO_DEVICE:
 291                 task_context->task_type = SCU_TASK_TYPE_IOWRITE;
 292                 break;
 293         }
 294
 295         task_context->transfer_length_bytes = len;
 296
 297         if (task_context->transfer_length_bytes > 0)
 298                 sci_request_build_sgl(ireq);
 299 }
 300
 301 /**
 302  * This method will fill in the SCU Task Context for a SSP Task request.  The
 303  *    following important settings are utilized: -# priority ==
 304  *    SCU_TASK_PRIORITY_HIGH.  This ensures that the task request is issued
 305  *    ahead of other task destined for the same Remote Node. -# task_type ==
 306  *    SCU_TASK_TYPE_IOREAD.  This simply indicates that a normal request type
 307  *    (i.e. non-raw frame) is being utilized to perform task management. -#
 308  *    control_frame == 1.  This ensures that the proper endianess is set so
 309  *    that the bytes are transmitted in the right order for a task frame.
 310  * @sci_req: This parameter specifies the task request object being
 311  *    constructed.
 312  *
 313  */
 314 static void scu_ssp_task_request_construct_task_context(struct isci_request *ireq)
 315 {
 316         struct scu_task_context *task_context = ireq->tc;
 317
 318         scu_ssp_reqeust_construct_task_context(ireq, task_context);
 319
 320         task_context->control_frame                = 1;
 321         task_context->priority                     = SCU_TASK_PRIORITY_HIGH;
 322         task_context->task_type                    = SCU_TASK_TYPE_RAW_FRAME;
 323         task_context->transfer_length_bytes        = 0;
 324         task_context->type.ssp.frame_type          = SSP_TASK;
 325         task_context->ssp_command_iu_length =
 326                 sizeof(struct ssp_task_iu) / sizeof(u32);
 327 }
 328
 329 /**
 330  * This method is will fill in the SCU Task Context for any type of SATA
 331  *    request.  This is called from the various SATA constructors.
 332  * @sci_req: The general IO request object which is to be used in
 333  *    constructing the SCU task context.
 334  * @task_context: The buffer pointer for the SCU task context which is being
 335  *    constructed.
 336  *
 337  * The general io request construction is complete. The buffer assignment for
 338  * the command buffer is complete. none Revisit task context construction to
 339  * determine what is common for SSP/SMP/STP task context structures.
 340  */
 341 static void scu_sata_reqeust_construct_task_context(
 342         struct isci_request *ireq,
 343         struct scu_task_context *task_context)
 344 {
 345         dma_addr_t dma_addr;
 346         struct isci_remote_device *idev;
 347         struct isci_port *iport;
 348
 349         idev = ireq->target_device;
 350         iport = idev->owning_port;
 351
 352         /* Fill in the TC with the its required data */
 353         task_context->abort = 0;
 354         task_context->priority = SCU_TASK_PRIORITY_NORMAL;
 355         task_context->initiator_request = 1;
 356         task_context->connection_rate = idev->connection_rate;
 357         task_context->protocol_engine_index = ISCI_PEG;
 358         task_context->logical_port_index = iport->physical_port_index;
 359         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_STP;
 360         task_context->valid = SCU_TASK_CONTEXT_VALID;
 361         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
 362
 363         task_context->remote_node_index = idev->rnc.remote_node_index;
 364         task_context->command_code = 0;
 365
 366         task_context->link_layer_control = 0;
 367         task_context->do_not_dma_ssp_good_response = 1;
 368         task_context->strict_ordering = 0;
 369         task_context->control_frame = 0;
 370         task_context->timeout_enable = 0;
 371         task_context->block_guard_enable = 0;
 372
 373         task_context->address_modifier = 0;
 374         task_context->task_phase = 0x01;
 375
 376         task_context->ssp_command_iu_length =
 377                 (sizeof(struct host_to_dev_fis) - sizeof(u32)) / sizeof(u32);
 378
 379         /* Set the first word of the H2D REG FIS */
 380         task_context->type.words[0] = *(u32 *)&ireq->stp.cmd;
 381
 382         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 383                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 384                               (iport->physical_port_index <<
 385                                SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
 386                               ISCI_TAG_TCI(ireq->io_tag));
 387         /*
 388          * Copy the physical address for the command buffer to the SCU Task
 389          * Context. We must offset the command buffer by 4 bytes because the
 390          * first 4 bytes are transfered in the body of the TC.
 391          */
 392         dma_addr = sci_io_request_get_dma_addr(ireq,
 393                                                 ((char *) &ireq->stp.cmd) +
 394                                                 sizeof(u32));
 395
 396         task_context->command_iu_upper = upper_32_bits(dma_addr);
 397         task_context->command_iu_lower = lower_32_bits(dma_addr);
 398
 399         /* SATA Requests do not have a response buffer */
 400         task_context->response_iu_upper = 0;
 401         task_context->response_iu_lower = 0;
 402 }
 403
 404 static void scu_stp_raw_request_construct_task_context(struct isci_request *ireq)
 405 {
 406         struct scu_task_context *task_context = ireq->tc;
 407
 408         scu_sata_reqeust_construct_task_context(ireq, task_context);
 409
 410         task_context->control_frame         = 0;
 411         task_context->priority              = SCU_TASK_PRIORITY_NORMAL;
 412         task_context->task_type             = SCU_TASK_TYPE_SATA_RAW_FRAME;
 413         task_context->type.stp.fis_type     = FIS_REGH2D;
 414         task_context->transfer_length_bytes = sizeof(struct host_to_dev_fis) - sizeof(u32);
 415 }
 416
 417 static enum sci_status sci_stp_pio_request_construct(struct isci_request *ireq,
 418                                                           bool copy_rx_frame)
 419 {
 420         struct isci_stp_request *stp_req = &ireq->stp.req;
 421
 422         scu_stp_raw_request_construct_task_context(ireq);
 423
 424         stp_req->status = 0;
 425         stp_req->sgl.offset = 0;
 426         stp_req->sgl.set = SCU_SGL_ELEMENT_PAIR_A;
 427
 428         if (copy_rx_frame) {
 429                 sci_request_build_sgl(ireq);
 430                 stp_req->sgl.index = 0;
 431         } else {
 432                 /* The user does not want the data copied to the SGL buffer location */
 433                 stp_req->sgl.index = -1;
 434         }
 435
 436         return SCI_SUCCESS;
 437 }
 438
 439 /**
 440  *
 441  * @sci_req: This parameter specifies the request to be constructed as an
 442  *    optimized request.
 443  * @optimized_task_type: This parameter specifies whether the request is to be
 444  *    an UDMA request or a NCQ request. - A value of 0 indicates UDMA. - A
 445  *    value of 1 indicates NCQ.
 446  *
 447  * This method will perform request construction common to all types of STP
 448  * requests that are optimized by the silicon (i.e. UDMA, NCQ). This method
 449  * returns an indication as to whether the construction was successful.
 450  */
 451 static void sci_stp_optimized_request_construct(struct isci_request *ireq,
 452                                                      u8 optimized_task_type,
 453                                                      u32 len,
 454                                                      enum dma_data_direction dir)
 455 {
 456         struct scu_task_context *task_context = ireq->tc;
 457
 458         /* Build the STP task context structure */
 459         scu_sata_reqeust_construct_task_context(ireq, task_context);
 460
 461         /* Copy over the SGL elements */
 462         sci_request_build_sgl(ireq);
 463
 464         /* Copy over the number of bytes to be transfered */
 465         task_context->transfer_length_bytes = len;
 466
 467         if (dir == DMA_TO_DEVICE) {
 468                 /*
 469                  * The difference between the DMA IN and DMA OUT request task type
 470                  * values are consistent with the difference between FPDMA READ
 471                  * and FPDMA WRITE values.  Add the supplied task type parameter
 472                  * to this difference to set the task type properly for this
 473                  * DATA OUT (WRITE) case. */
 474                 task_context->task_type = optimized_task_type + (SCU_TASK_TYPE_DMA_OUT
 475                                                                  - SCU_TASK_TYPE_DMA_IN);
 476         } else {
 477                 /*
 478                  * For the DATA IN (READ) case, simply save the supplied
 479                  * optimized task type. */
 480                 task_context->task_type = optimized_task_type;
 481         }
 482 }
 483
 484 static void sci_atapi_construct(struct isci_request *ireq)
 485 {
 486         struct host_to_dev_fis *h2d_fis = &ireq->stp.cmd;
 487         struct sas_task *task;
 488
 489         /* To simplify the implementation we take advantage of the
 490          * silicon's partial acceleration of atapi protocol (dma data
 491          * transfers), so we promote all commands to dma protocol.  This
 492          * breaks compatibility with ATA_HORKAGE_ATAPI_MOD16_DMA drives.
 493          */
 494         h2d_fis->features |= ATAPI_PKT_DMA;
 495
 496         scu_stp_raw_request_construct_task_context(ireq);
 497
 498         task = isci_request_access_task(ireq);
 499         if (task->data_dir == DMA_NONE)
 500                 task->total_xfer_len = 0;
 501
 502         /* clear the response so we can detect arrivial of an
 503          * unsolicited h2d fis
 504          */
 505         ireq->stp.rsp.fis_type = 0;
 506 }
 507
 508 static enum sci_status
 509 sci_io_request_construct_sata(struct isci_request *ireq,
 510                                u32 len,
 511                                enum dma_data_direction dir,
 512                                bool copy)
 513 {
 514         enum sci_status status = SCI_SUCCESS;
 515         struct sas_task *task = isci_request_access_task(ireq);
 516         struct domain_device *dev = ireq->target_device->domain_dev;
 517
 518         /* check for management protocols */
 519         if (test_bit(IREQ_TMF, &ireq->flags)) {
 520                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 521
 522                 if (tmf->tmf_code == isci_tmf_sata_srst_high ||
 523                     tmf->tmf_code == isci_tmf_sata_srst_low) {
 524                         scu_stp_raw_request_construct_task_context(ireq);
 525                         return SCI_SUCCESS;
 526                 } else {
 527                         dev_err(&ireq->owning_controller->pdev->dev,
 528                                 "%s: Request 0x%p received un-handled SAT "
 529                                 "management protocol 0x%x.\n",
 530                                 __func__, ireq, tmf->tmf_code);
 531
 532                         return SCI_FAILURE;
 533                 }
 534         }
 535
 536         if (!sas_protocol_ata(task->task_proto)) {
 537                 dev_err(&ireq->owning_controller->pdev->dev,
 538                         "%s: Non-ATA protocol in SATA path: 0x%x\n",
 539                         __func__,
 540                         task->task_proto);
 541                 return SCI_FAILURE;
 542
 543         }
 544
 545         /* ATAPI */
 546         if (dev->sata_dev.command_set == ATAPI_COMMAND_SET &&
 547             task->ata_task.fis.command == ATA_CMD_PACKET) {
 548                 sci_atapi_construct(ireq);
 549                 return SCI_SUCCESS;
 550         }
 551
 552         /* non data */
 553         if (task->data_dir == DMA_NONE) {
 554                 scu_stp_raw_request_construct_task_context(ireq);
 555                 return SCI_SUCCESS;
 556         }
 557
 558         /* NCQ */
 559         if (task->ata_task.use_ncq) {
 560                 sci_stp_optimized_request_construct(ireq,
 561                                                          SCU_TASK_TYPE_FPDMAQ_READ,
 562                                                          len, dir);
 563                 return SCI_SUCCESS;
 564         }
 565
 566         /* DMA */
 567         if (task->ata_task.dma_xfer) {
 568                 sci_stp_optimized_request_construct(ireq,
 569                                                          SCU_TASK_TYPE_DMA_IN,
 570                                                          len, dir);
 571                 return SCI_SUCCESS;
 572         } else /* PIO */
 573                 return sci_stp_pio_request_construct(ireq, copy);
 574
 575         return status;
 576 }
 577
 578 static enum sci_status sci_io_request_construct_basic_ssp(struct isci_request *ireq)
 579 {
 580         struct sas_task *task = isci_request_access_task(ireq);
 581
 582         ireq->protocol = SCIC_SSP_PROTOCOL;
 583
 584         scu_ssp_io_request_construct_task_context(ireq,
 585                                                   task->data_dir,
 586                                                   task->total_xfer_len);
 587
 588         sci_io_request_build_ssp_command_iu(ireq);
 589
 590         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 591
 592         return SCI_SUCCESS;
 593 }
 594
 595 enum sci_status sci_task_request_construct_ssp(
 596         struct isci_request *ireq)
 597 {
 598         /* Construct the SSP Task SCU Task Context */
 599         scu_ssp_task_request_construct_task_context(ireq);
 600
 601         /* Fill in the SSP Task IU */
 602         sci_task_request_build_ssp_task_iu(ireq);
 603
 604         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 605
 606         return SCI_SUCCESS;
 607 }
 608
 609 static enum sci_status sci_io_request_construct_basic_sata(struct isci_request *ireq)
 610 {
 611         enum sci_status status;
 612         bool copy = false;
 613         struct sas_task *task = isci_request_access_task(ireq);
 614
 615         ireq->protocol = SCIC_STP_PROTOCOL;
 616
 617         copy = (task->data_dir == DMA_NONE) ? false : true;
 618
 619         status = sci_io_request_construct_sata(ireq,
 620                                                 task->total_xfer_len,
 621                                                 task->data_dir,
 622                                                 copy);
 623
 624         if (status == SCI_SUCCESS)
 625                 sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 626
 627         return status;
 628 }
 629
 630 enum sci_status sci_task_request_construct_sata(struct isci_request *ireq)
 631 {
 632         enum sci_status status = SCI_SUCCESS;
 633
 634         /* check for management protocols */
 635         if (test_bit(IREQ_TMF, &ireq->flags)) {
 636                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 637
 638                 if (tmf->tmf_code == isci_tmf_sata_srst_high ||
 639                     tmf->tmf_code == isci_tmf_sata_srst_low) {
 640                         scu_stp_raw_request_construct_task_context(ireq);
 641                 } else {
 642                         dev_err(&ireq->owning_controller->pdev->dev,
 643                                 "%s: Request 0x%p received un-handled SAT "
 644                                 "Protocol 0x%x.\n",
 645                                 __func__, ireq, tmf->tmf_code);
 646
 647                         return SCI_FAILURE;
 648                 }
 649         }
 650
 651         if (status != SCI_SUCCESS)
 652                 return status;
 653         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 654
 655         return status;
 656 }
 657
 658 /**
 659  * sci_req_tx_bytes - bytes transferred when reply underruns request
 660  * @ireq: request that was terminated early
 661  */
 662 #define SCU_TASK_CONTEXT_SRAM 0x200000
 663 static u32 sci_req_tx_bytes(struct isci_request *ireq)
 664 {
 665         struct isci_host *ihost = ireq->owning_controller;
 666         u32 ret_val = 0;
 667
 668         if (readl(&ihost->smu_registers->address_modifier) == 0) {
 669                 void __iomem *scu_reg_base = ihost->scu_registers;
 670
 671                 /* get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where
 672                  *   BAR1 is the scu_registers
 673                  *   0x20002C = 0x200000 + 0x2c
 674                  *            = start of task context SRAM + offset of (type.ssp.data_offset)
 675                  *   TCi is the io_tag of struct sci_request
 676                  */
 677                 ret_val = readl(scu_reg_base +
 678                                 (SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
 679                                 ((sizeof(struct scu_task_context)) * ISCI_TAG_TCI(ireq->io_tag)));
 680         }
 681
 682         return ret_val;
 683 }
 684
 685 enum sci_status sci_request_start(struct isci_request *ireq)
 686 {
 687         enum sci_base_request_states state;
 688         struct scu_task_context *tc = ireq->tc;
 689         struct isci_host *ihost = ireq->owning_controller;
 690
 691         state = ireq->sm.current_state_id;
 692         if (state != SCI_REQ_CONSTRUCTED) {
 693                 dev_warn(&ihost->pdev->dev,
 694                         "%s: SCIC IO Request requested to start while in wrong "
 695                          "state %d\n", __func__, state);
 696                 return SCI_FAILURE_INVALID_STATE;
 697         }
 698
 699         tc->task_index = ISCI_TAG_TCI(ireq->io_tag);
 700
 701         switch (tc->protocol_type) {
 702         case SCU_TASK_CONTEXT_PROTOCOL_SMP:
 703         case SCU_TASK_CONTEXT_PROTOCOL_SSP:
 704                 /* SSP/SMP Frame */
 705                 tc->type.ssp.tag = ireq->io_tag;
 706                 tc->type.ssp.target_port_transfer_tag = 0xFFFF;
 707                 break;
 708
 709         case SCU_TASK_CONTEXT_PROTOCOL_STP:
 710                 /* STP/SATA Frame
 711                  * tc->type.stp.ncq_tag = ireq->ncq_tag;
 712                  */
 713                 break;
 714
 715         case SCU_TASK_CONTEXT_PROTOCOL_NONE:
 716                 /* / @todo When do we set no protocol type? */
 717                 break;
 718
 719         default:
 720                 /* This should never happen since we build the IO
 721                  * requests */
 722                 break;
 723         }
 724
 725         /* Add to the post_context the io tag value */
 726         ireq->post_context |= ISCI_TAG_TCI(ireq->io_tag);
 727
 728         /* Everything is good go ahead and change state */
 729         sci_change_state(&ireq->sm, SCI_REQ_STARTED);
 730
 731         return SCI_SUCCESS;
 732 }
 733
 734 enum sci_status
 735 sci_io_request_terminate(struct isci_request *ireq)
 736 {
 737         enum sci_base_request_states state;
 738
 739         state = ireq->sm.current_state_id;
 740
 741         switch (state) {
 742         case SCI_REQ_CONSTRUCTED:
 743                 ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
 744                 ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
 745                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
 746                 return SCI_SUCCESS;
 747         case SCI_REQ_STARTED:
 748         case SCI_REQ_TASK_WAIT_TC_COMP:
 749         case SCI_REQ_SMP_WAIT_RESP:
 750         case SCI_REQ_SMP_WAIT_TC_COMP:
 751         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
 752         case SCI_REQ_STP_UDMA_WAIT_D2H:
 753         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
 754         case SCI_REQ_STP_NON_DATA_WAIT_D2H:
 755         case SCI_REQ_STP_PIO_WAIT_H2D:
 756         case SCI_REQ_STP_PIO_WAIT_FRAME:
 757         case SCI_REQ_STP_PIO_DATA_IN:
 758         case SCI_REQ_STP_PIO_DATA_OUT:
 759         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
 760         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
 761         case SCI_REQ_STP_SOFT_RESET_WAIT_D2H:
 762         case SCI_REQ_ATAPI_WAIT_H2D:
 763         case SCI_REQ_ATAPI_WAIT_PIO_SETUP:
 764         case SCI_REQ_ATAPI_WAIT_D2H:
 765         case SCI_REQ_ATAPI_WAIT_TC_COMP:
 766                 sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
 767                 return SCI_SUCCESS;
 768         case SCI_REQ_TASK_WAIT_TC_RESP:
 769                 /* The task frame was already confirmed to have been
 770                  * sent by the SCU HW.  Since the state machine is
 771                  * now only waiting for the task response itself,
 772                  * abort the request and complete it immediately
 773                  * and don't wait for the task response.
 774                  */
 775                 sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
 776                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
 777                 return SCI_SUCCESS;
 778         case SCI_REQ_ABORTING:
 779                 /* If a request has a termination requested twice, return
 780                  * a failure indication, since HW confirmation of the first
 781                  * abort is still outstanding.
 782                  */
 783         case SCI_REQ_COMPLETED:
 784         default:
 785                 dev_warn(&ireq->owning_controller->pdev->dev,
 786                          "%s: SCIC IO Request requested to abort while in wrong "
 787                          "state %d\n",
 788                          __func__,
 789                          ireq->sm.current_state_id);
 790                 break;
 791         }
 792
 793         return SCI_FAILURE_INVALID_STATE;
 794 }
 795
 796 enum sci_status sci_request_complete(struct isci_request *ireq)
 797 {
 798         enum sci_base_request_states state;
 799         struct isci_host *ihost = ireq->owning_controller;
 800
 801         state = ireq->sm.current_state_id;
 802         if (WARN_ONCE(state != SCI_REQ_COMPLETED,
 803                       "isci: request completion from wrong state (%d)\n", state))
 804                 return SCI_FAILURE_INVALID_STATE;
 805
 806         if (ireq->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX)
 807                 sci_controller_release_frame(ihost,
 808                                                   ireq->saved_rx_frame_index);
 809
 810         /* XXX can we just stop the machine and remove the 'final' state? */
 811         sci_change_state(&ireq->sm, SCI_REQ_FINAL);
 812         return SCI_SUCCESS;
 813 }
 814
 815 enum sci_status sci_io_request_event_handler(struct isci_request *ireq,
 816                                                   u32 event_code)
 817 {
 818         enum sci_base_request_states state;
 819         struct isci_host *ihost = ireq->owning_controller;
 820
 821         state = ireq->sm.current_state_id;
 822
 823         if (state != SCI_REQ_STP_PIO_DATA_IN) {
 824                 dev_warn(&ihost->pdev->dev, "%s: (%x) in wrong state %d\n",
 825                          __func__, event_code, state);
 826
 827                 return SCI_FAILURE_INVALID_STATE;
 828         }
 829
 830         switch (scu_get_event_specifier(event_code)) {
 831         case SCU_TASK_DONE_CRC_ERR << SCU_EVENT_SPECIFIC_CODE_SHIFT:
 832                 /* We are waiting for data and the SCU has R_ERR the data frame.
 833                  * Go back to waiting for the D2H Register FIS
 834                  */
 835                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
 836                 return SCI_SUCCESS;
 837         default:
 838                 dev_err(&ihost->pdev->dev,
 839                         "%s: pio request unexpected event %#x\n",
 840                         __func__, event_code);
 841
 842                 /* TODO Should we fail the PIO request when we get an
 843                  * unexpected event?
 844                  */
 845                 return SCI_FAILURE;
 846         }
 847 }
 848
 849 /*
 850  * This function copies response data for requests returning response data
 851  *    instead of sense data.
 852  * @sci_req: This parameter specifies the request object for which to copy
 853  *    the response data.
 854  */
 855 static void sci_io_request_copy_response(struct isci_request *ireq)
 856 {
 857         void *resp_buf;
 858         u32 len;
 859         struct ssp_response_iu *ssp_response;
 860         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
 861
 862         ssp_response = &ireq->ssp.rsp;
 863
 864         resp_buf = &isci_tmf->resp.resp_iu;
 865
 866         len = min_t(u32,
 867                     SSP_RESP_IU_MAX_SIZE,
 868                     be32_to_cpu(ssp_response->response_data_len));
 869
 870         memcpy(resp_buf, ssp_response->resp_data, len);
 871 }
 872
 873 static enum sci_status
 874 request_started_state_tc_event(struct isci_request *ireq,
 875                                u32 completion_code)
 876 {
 877         struct ssp_response_iu *resp_iu;
 878         u8 datapres;
 879
 880         /* TODO: Any SDMA return code of other than 0 is bad decode 0x003C0000
 881          * to determine SDMA status
 882          */
 883         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
 884         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
 885                 ireq->scu_status = SCU_TASK_DONE_GOOD;
 886                 ireq->sci_status = SCI_SUCCESS;
 887                 break;
 888         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP): {
 889                 /* There are times when the SCU hardware will return an early
 890                  * response because the io request specified more data than is
 891                  * returned by the target device (mode pages, inquiry data,
 892                  * etc.).  We must check the response stats to see if this is
 893                  * truly a failed request or a good request that just got
 894                  * completed early.
 895                  */
 896                 struct ssp_response_iu *resp = &ireq->ssp.rsp;
 897                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
 898
 899                 sci_swab32_cpy(&ireq->ssp.rsp,
 900                                &ireq->ssp.rsp,
 901                                word_cnt);
 902
 903                 if (resp->status == 0) {
 904                         ireq->scu_status = SCU_TASK_DONE_GOOD;
 905                         ireq->sci_status = SCI_SUCCESS_IO_DONE_EARLY;
 906                 } else {
 907                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
 908                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
 909                 }
 910                 break;
 911         }
 912         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE): {
 913                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
 914
 915                 sci_swab32_cpy(&ireq->ssp.rsp,
 916                                &ireq->ssp.rsp,
 917                                word_cnt);
 918
 919                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
 920                 ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
 921                 break;
 922         }
 923
 924         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR):
 925                 /* TODO With TASK_DONE_RESP_LEN_ERR is the response frame
 926                  * guaranteed to be received before this completion status is
 927                  * posted?
 928                  */
 929                 resp_iu = &ireq->ssp.rsp;
 930                 datapres = resp_iu->datapres;
 931
 932                 if (datapres == 1 || datapres == 2) {
 933                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
 934                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
 935                 } else {
 936                         ireq->scu_status = SCU_TASK_DONE_GOOD;
 937                         ireq->sci_status = SCI_SUCCESS;
 938                 }
 939                 break;
 940         /* only stp device gets suspended. */
 941         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
 942         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR):
 943         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR):
 944         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR):
 945         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR):
 946         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN):
 947         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
 948         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP):
 949         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS):
 950         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
 951         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR):
 952                 if (ireq->protocol == SCIC_STP_PROTOCOL) {
 953                         ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
 954                                            SCU_COMPLETION_TL_STATUS_SHIFT;
 955                         ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
 956                 } else {
 957                         ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
 958                                            SCU_COMPLETION_TL_STATUS_SHIFT;
 959                         ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
 960                 }
 961                 break;
 962
 963         /* both stp/ssp device gets suspended */
 964         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR):
 965         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION):
 966         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1):
 967         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2):
 968         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3):
 969         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION):
 970         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION):
 971         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY):
 972         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED):
 973         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED):
 974                 ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
 975                                    SCU_COMPLETION_TL_STATUS_SHIFT;
 976                 ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
 977                 break;
 978
 979         /* neither ssp nor stp gets suspended. */
 980         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR):
 981         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR):
 982         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR):
 983         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR):
 984         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR):
 985         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA):
 986         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
 987         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
 988         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
 989         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
 990         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA):
 991         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL):
 992         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV):
 993         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV):
 994         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND):
 995         default:
 996                 ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
 997                                    SCU_COMPLETION_TL_STATUS_SHIFT;
 998                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
 999                 break;
1000         }
1001
1002         /*
1003          * TODO: This is probably wrong for ACK/NAK timeout conditions
1004          */
1005
1006         /* In all cases we will treat this as the completion of the IO req. */
1007         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1008         return SCI_SUCCESS;
1009 }
1010
1011 static enum sci_status
1012 request_aborting_state_tc_event(struct isci_request *ireq,
1013                                 u32 completion_code)
1014 {
1015         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1016         case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
1017         case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT):
1018                 ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
1019                 ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
1020                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1021                 break;
1022
1023         default:
1024                 /* Unless we get some strange error wait for the task abort to complete
1025                  * TODO: Should there be a state change for this completion?
1026                  */
1027                 break;
1028         }
1029
1030         return SCI_SUCCESS;
1031 }
1032
1033 static enum sci_status ssp_task_request_await_tc_event(struct isci_request *ireq,
1034                                                        u32 completion_code)
1035 {
1036         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1037         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1038                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1039                 ireq->sci_status = SCI_SUCCESS;
1040                 sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1041                 break;
1042         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
1043                 /* Currently, the decision is to simply allow the task request
1044                  * to timeout if the task IU wasn't received successfully.
1045                  * There is a potential for receiving multiple task responses if
1046                  * we decide to send the task IU again.
1047                  */
1048                 dev_warn(&ireq->owning_controller->pdev->dev,
1049                          "%s: TaskRequest:0x%p CompletionCode:%x - "
1050                          "ACK/NAK timeout\n", __func__, ireq,
1051                          completion_code);
1052
1053                 sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1054                 break;
1055         default:
1056                 /*
1057                  * All other completion status cause the IO to be complete.
1058                  * If a NAK was received, then it is up to the user to retry
1059                  * the request.
1060                  */
1061                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1062                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1063                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1064                 break;
1065         }
1066
1067         return SCI_SUCCESS;
1068 }
1069
1070 static enum sci_status
1071 smp_request_await_response_tc_event(struct isci_request *ireq,
1072                                     u32 completion_code)
1073 {
1074         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1075         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1076                 /* In the AWAIT RESPONSE state, any TC completion is
1077                  * unexpected.  but if the TC has success status, we
1078                  * complete the IO anyway.
1079                  */
1080                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1081                 ireq->sci_status = SCI_SUCCESS;
1082                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1083                 break;
1084         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
1085         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
1086         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
1087         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
1088                 /* These status has been seen in a specific LSI
1089                  * expander, which sometimes is not able to send smp
1090                  * response within 2 ms. This causes our hardware break
1091                  * the connection and set TC completion with one of
1092                  * these SMP_XXX_XX_ERR status. For these type of error,
1093                  * we ask ihost user to retry the request.
1094                  */
1095                 ireq->scu_status = SCU_TASK_DONE_SMP_RESP_TO_ERR;
1096                 ireq->sci_status = SCI_FAILURE_RETRY_REQUIRED;
1097                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1098                 break;
1099         default:
1100                 /* All other completion status cause the IO to be complete.  If a NAK
1101                  * was received, then it is up to the user to retry the request
1102                  */
1103                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1104                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1105                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1106                 break;
1107         }
1108
1109         return SCI_SUCCESS;
1110 }
1111
1112 static enum sci_status
1113 smp_request_await_tc_event(struct isci_request *ireq,
1114                            u32 completion_code)
1115 {
1116         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1117         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1118                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1119                 ireq->sci_status = SCI_SUCCESS;
1120                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1121                 break;
1122         default:
1123                 /* All other completion status cause the IO to be
1124                  * complete.  If a NAK was received, then it is up to
1125                  * the user to retry the request.
1126                  */
1127                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1128                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1129                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1130                 break;
1131         }
1132
1133         return SCI_SUCCESS;
1134 }
1135
1136 static struct scu_sgl_element *pio_sgl_next(struct isci_stp_request *stp_req)
1137 {
1138         struct scu_sgl_element *sgl;
1139         struct scu_sgl_element_pair *sgl_pair;
1140         struct isci_request *ireq = to_ireq(stp_req);
1141         struct isci_stp_pio_sgl *pio_sgl = &stp_req->sgl;
1142
1143         sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
1144         if (!sgl_pair)
1145                 sgl = NULL;
1146         else if (pio_sgl->set == SCU_SGL_ELEMENT_PAIR_A) {
1147                 if (sgl_pair->B.address_lower == 0 &&
1148                     sgl_pair->B.address_upper == 0) {
1149                         sgl = NULL;
1150                 } else {
1151                         pio_sgl->set = SCU_SGL_ELEMENT_PAIR_B;
1152                         sgl = &sgl_pair->B;
1153                 }
1154         } else {
1155                 if (sgl_pair->next_pair_lower == 0 &&
1156                     sgl_pair->next_pair_upper == 0) {
1157                         sgl = NULL;
1158                 } else {
1159                         pio_sgl->index++;
1160                         pio_sgl->set = SCU_SGL_ELEMENT_PAIR_A;
1161                         sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
1162                         sgl = &sgl_pair->A;
1163                 }
1164         }
1165
1166         return sgl;
1167 }
1168
1169 static enum sci_status
1170 stp_request_non_data_await_h2d_tc_event(struct isci_request *ireq,
1171                                         u32 completion_code)
1172 {
1173         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1174         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1175                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1176                 ireq->sci_status = SCI_SUCCESS;
1177                 sci_change_state(&ireq->sm, SCI_REQ_STP_NON_DATA_WAIT_D2H);
1178                 break;
1179
1180         default:
1181                 /* All other completion status cause the IO to be
1182                  * complete.  If a NAK was received, then it is up to
1183                  * the user to retry the request.
1184                  */
1185                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1186                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1187                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1188                 break;
1189         }
1190
1191         return SCI_SUCCESS;
1192 }
1193
1194 #define SCU_MAX_FRAME_BUFFER_SIZE  0x400  /* 1K is the maximum SCU frame data payload */
1195
1196 /* transmit DATA_FIS from (current sgl + offset) for input
1197  * parameter length. current sgl and offset is alreay stored in the IO request
1198  */
1199 static enum sci_status sci_stp_request_pio_data_out_trasmit_data_frame(
1200         struct isci_request *ireq,
1201         u32 length)
1202 {
1203         struct isci_stp_request *stp_req = &ireq->stp.req;
1204         struct scu_task_context *task_context = ireq->tc;
1205         struct scu_sgl_element_pair *sgl_pair;
1206         struct scu_sgl_element *current_sgl;
1207
1208         /* Recycle the TC and reconstruct it for sending out DATA FIS containing
1209          * for the data from current_sgl+offset for the input length
1210          */
1211         sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
1212         if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A)
1213                 current_sgl = &sgl_pair->A;
1214         else
1215                 current_sgl = &sgl_pair->B;
1216
1217         /* update the TC */
1218         task_context->command_iu_upper = current_sgl->address_upper;
1219         task_context->command_iu_lower = current_sgl->address_lower;
1220         task_context->transfer_length_bytes = length;
1221         task_context->type.stp.fis_type = FIS_DATA;
1222
1223         /* send the new TC out. */
1224         return sci_controller_continue_io(ireq);
1225 }
1226
1227 static enum sci_status sci_stp_request_pio_data_out_transmit_data(struct isci_request *ireq)
1228 {
1229         struct isci_stp_request *stp_req = &ireq->stp.req;
1230         struct scu_sgl_element_pair *sgl_pair;
1231         enum sci_status status = SCI_SUCCESS;
1232         struct scu_sgl_element *sgl;
1233         u32 offset;
1234         u32 len = 0;
1235
1236         offset = stp_req->sgl.offset;
1237         sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
1238         if (WARN_ONCE(!sgl_pair, "%s: null sgl element", __func__))
1239                 return SCI_FAILURE;
1240
1241         if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A) {
1242                 sgl = &sgl_pair->A;
1243                 len = sgl_pair->A.length - offset;
1244         } else {
1245                 sgl = &sgl_pair->B;
1246                 len = sgl_pair->B.length - offset;
1247         }
1248
1249         if (stp_req->pio_len == 0)
1250                 return SCI_SUCCESS;
1251
1252         if (stp_req->pio_len >= len) {
1253                 status = sci_stp_request_pio_data_out_trasmit_data_frame(ireq, len);
1254                 if (status != SCI_SUCCESS)
1255                         return status;
1256                 stp_req->pio_len -= len;
1257
1258                 /* update the current sgl, offset and save for future */
1259                 sgl = pio_sgl_next(stp_req);
1260                 offset = 0;
1261         } else if (stp_req->pio_len < len) {
1262                 sci_stp_request_pio_data_out_trasmit_data_frame(ireq, stp_req->pio_len);
1263
1264                 /* Sgl offset will be adjusted and saved for future */
1265                 offset += stp_req->pio_len;
1266                 sgl->address_lower += stp_req->pio_len;
1267                 stp_req->pio_len = 0;
1268         }
1269
1270         stp_req->sgl.offset = offset;
1271
1272         return status;
1273 }
1274
1275 /**
1276  *
1277  * @stp_request: The request that is used for the SGL processing.
1278  * @data_buffer: The buffer of data to be copied.
1279  * @length: The length of the data transfer.
1280  *
1281  * Copy the data from the buffer for the length specified to the IO reqeust SGL
1282  * specified data region. enum sci_status
1283  */
1284 static enum sci_status
1285 sci_stp_request_pio_data_in_copy_data_buffer(struct isci_stp_request *stp_req,
1286                                              u8 *data_buf, u32 len)
1287 {
1288         struct isci_request *ireq;
1289         u8 *src_addr;
1290         int copy_len;
1291         struct sas_task *task;
1292         struct scatterlist *sg;
1293         void *kaddr;
1294         int total_len = len;
1295
1296         ireq = to_ireq(stp_req);
1297         task = isci_request_access_task(ireq);
1298         src_addr = data_buf;
1299
1300         if (task->num_scatter > 0) {
1301                 sg = task->scatter;
1302
1303                 while (total_len > 0) {
1304                         struct page *page = sg_page(sg);
1305
1306                         copy_len = min_t(int, total_len, sg_dma_len(sg));
1307                         kaddr = kmap_atomic(page, KM_IRQ0);
1308                         memcpy(kaddr + sg->offset, src_addr, copy_len);
1309                         kunmap_atomic(kaddr, KM_IRQ0);
1310                         total_len -= copy_len;
1311                         src_addr += copy_len;
1312                         sg = sg_next(sg);
1313                 }
1314         } else {
1315                 BUG_ON(task->total_xfer_len < total_len);
1316                 memcpy(task->scatter, src_addr, total_len);
1317         }
1318
1319         return SCI_SUCCESS;
1320 }
1321
1322 /**
1323  *
1324  * @sci_req: The PIO DATA IN request that is to receive the data.
1325  * @data_buffer: The buffer to copy from.
1326  *
1327  * Copy the data buffer to the io request data region. enum sci_status
1328  */
1329 static enum sci_status sci_stp_request_pio_data_in_copy_data(
1330         struct isci_stp_request *stp_req,
1331         u8 *data_buffer)
1332 {
1333         enum sci_status status;
1334
1335         /*
1336          * If there is less than 1K remaining in the transfer request
1337          * copy just the data for the transfer */
1338         if (stp_req->pio_len < SCU_MAX_FRAME_BUFFER_SIZE) {
1339                 status = sci_stp_request_pio_data_in_copy_data_buffer(
1340                         stp_req, data_buffer, stp_req->pio_len);
1341
1342                 if (status == SCI_SUCCESS)
1343                         stp_req->pio_len = 0;
1344         } else {
1345                 /* We are transfering the whole frame so copy */
1346                 status = sci_stp_request_pio_data_in_copy_data_buffer(
1347                         stp_req, data_buffer, SCU_MAX_FRAME_BUFFER_SIZE);
1348
1349                 if (status == SCI_SUCCESS)
1350                         stp_req->pio_len -= SCU_MAX_FRAME_BUFFER_SIZE;
1351         }
1352
1353         return status;
1354 }
1355
1356 static enum sci_status
1357 stp_request_pio_await_h2d_completion_tc_event(struct isci_request *ireq,
1358                                               u32 completion_code)
1359 {
1360         enum sci_status status = SCI_SUCCESS;
1361
1362         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1363         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1364                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1365                 ireq->sci_status = SCI_SUCCESS;
1366                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1367                 break;
1368
1369         default:
1370                 /* All other completion status cause the IO to be
1371                  * complete.  If a NAK was received, then it is up to
1372                  * the user to retry the request.
1373                  */
1374                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1375                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1376                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1377                 break;
1378         }
1379
1380         return status;
1381 }
1382
1383 static enum sci_status
1384 pio_data_out_tx_done_tc_event(struct isci_request *ireq,
1385                               u32 completion_code)
1386 {
1387         enum sci_status status = SCI_SUCCESS;
1388         bool all_frames_transferred = false;
1389         struct isci_stp_request *stp_req = &ireq->stp.req;
1390
1391         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1392         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1393                 /* Transmit data */
1394                 if (stp_req->pio_len != 0) {
1395                         status = sci_stp_request_pio_data_out_transmit_data(ireq);
1396                         if (status == SCI_SUCCESS) {
1397                                 if (stp_req->pio_len == 0)
1398                                         all_frames_transferred = true;
1399                         }
1400                 } else if (stp_req->pio_len == 0) {
1401                         /*
1402                          * this will happen if the all data is written at the
1403                          * first time after the pio setup fis is received
1404                          */
1405                         all_frames_transferred  = true;
1406                 }
1407
1408                 /* all data transferred. */
1409                 if (all_frames_transferred) {
1410                         /*
1411                          * Change the state to SCI_REQ_STP_PIO_DATA_IN
1412                          * and wait for PIO_SETUP fis / or D2H REg fis. */
1413                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1414                 }
1415                 break;
1416
1417         default:
1418                 /*
1419                  * All other completion status cause the IO to be complete.
1420                  * If a NAK was received, then it is up to the user to retry
1421                  * the request.
1422                  */
1423                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1424                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1425                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1426                 break;
1427         }
1428
1429         return status;
1430 }
1431
1432 static enum sci_status sci_stp_request_udma_general_frame_handler(struct isci_request *ireq,
1433                                                                        u32 frame_index)
1434 {
1435         struct isci_host *ihost = ireq->owning_controller;
1436         struct dev_to_host_fis *frame_header;
1437         enum sci_status status;
1438         u32 *frame_buffer;
1439
1440         status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1441                                                                frame_index,
1442                                                                (void **)&frame_header);
1443
1444         if ((status == SCI_SUCCESS) &&
1445             (frame_header->fis_type == FIS_REGD2H)) {
1446                 sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1447                                                               frame_index,
1448                                                               (void **)&frame_buffer);
1449
1450                 sci_controller_copy_sata_response(&ireq->stp.rsp,
1451                                                        frame_header,
1452                                                        frame_buffer);
1453         }
1454
1455         sci_controller_release_frame(ihost, frame_index);
1456
1457         return status;
1458 }
1459
1460 static enum sci_status process_unsolicited_fis(struct isci_request *ireq,
1461                                                u32 frame_index)
1462 {
1463         struct isci_host *ihost = ireq->owning_controller;
1464         enum sci_status status;
1465         struct dev_to_host_fis *frame_header;
1466         u32 *frame_buffer;
1467
1468         status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1469                                                           frame_index,
1470                                                           (void **)&frame_header);
1471
1472         if (status != SCI_SUCCESS)
1473                 return status;
1474
1475         if (frame_header->fis_type != FIS_REGD2H) {
1476                 dev_err(&ireq->isci_host->pdev->dev,
1477                         "%s ERROR: invalid fis type 0x%X\n",
1478                         __func__, frame_header->fis_type);
1479                 return SCI_FAILURE;
1480         }
1481
1482         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1483                                                  frame_index,
1484                                                  (void **)&frame_buffer);
1485
1486         sci_controller_copy_sata_response(&ireq->stp.rsp,
1487                                           (u32 *)frame_header,
1488                                           frame_buffer);
1489
1490         /* Frame has been decoded return it to the controller */
1491         sci_controller_release_frame(ihost, frame_index);
1492
1493         return status;
1494 }
1495
1496 static enum sci_status atapi_d2h_reg_frame_handler(struct isci_request *ireq,
1497                                                    u32 frame_index)
1498 {
1499         struct sas_task *task = isci_request_access_task(ireq);
1500         enum sci_status status;
1501
1502         status = process_unsolicited_fis(ireq, frame_index);
1503
1504         if (status == SCI_SUCCESS) {
1505                 if (ireq->stp.rsp.status & ATA_ERR)
1506                         status = SCI_IO_FAILURE_RESPONSE_VALID;
1507         } else {
1508                 status = SCI_IO_FAILURE_RESPONSE_VALID;
1509         }
1510
1511         if (status != SCI_SUCCESS) {
1512                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1513                 ireq->sci_status = status;
1514         } else {
1515                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1516                 ireq->sci_status = SCI_SUCCESS;
1517         }
1518
1519         /* the d2h ufi is the end of non-data commands */
1520         if (task->data_dir == DMA_NONE)
1521                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1522
1523         return status;
1524 }
1525
1526 static void scu_atapi_reconstruct_raw_frame_task_context(struct isci_request *ireq)
1527 {
1528         struct ata_device *dev = sas_to_ata_dev(ireq->target_device->domain_dev);
1529         void *atapi_cdb = ireq->ttype_ptr.io_task_ptr->ata_task.atapi_packet;
1530         struct scu_task_context *task_context = ireq->tc;
1531
1532         /* fill in the SCU Task Context for a DATA fis containing CDB in Raw Frame
1533          * type. The TC for previous Packet fis was already there, we only need to
1534          * change the H2D fis content.
1535          */
1536         memset(&ireq->stp.cmd, 0, sizeof(struct host_to_dev_fis));
1537         memcpy(((u8 *)&ireq->stp.cmd + sizeof(u32)), atapi_cdb, ATAPI_CDB_LEN);
1538         memset(&(task_context->type.stp), 0, sizeof(struct stp_task_context));
1539         task_context->type.stp.fis_type = FIS_DATA;
1540         task_context->transfer_length_bytes = dev->cdb_len;
1541 }
1542
1543 static void scu_atapi_construct_task_context(struct isci_request *ireq)
1544 {
1545         struct ata_device *dev = sas_to_ata_dev(ireq->target_device->domain_dev);
1546         struct sas_task *task = isci_request_access_task(ireq);
1547         struct scu_task_context *task_context = ireq->tc;
1548         int cdb_len = dev->cdb_len;
1549
1550         /* reference: SSTL 1.13.4.2
1551          * task_type, sata_direction
1552          */
1553         if (task->data_dir == DMA_TO_DEVICE) {
1554                 task_context->task_type = SCU_TASK_TYPE_PACKET_DMA_OUT;
1555                 task_context->sata_direction = 0;
1556         } else {
1557                 /* todo: for NO_DATA command, we need to send out raw frame. */
1558                 task_context->task_type = SCU_TASK_TYPE_PACKET_DMA_IN;
1559                 task_context->sata_direction = 1;
1560         }
1561
1562         memset(&task_context->type.stp, 0, sizeof(task_context->type.stp));
1563         task_context->type.stp.fis_type = FIS_DATA;
1564
1565         memset(&ireq->stp.cmd, 0, sizeof(ireq->stp.cmd));
1566         memcpy(&ireq->stp.cmd.lbal, task->ata_task.atapi_packet, cdb_len);
1567         task_context->ssp_command_iu_length = cdb_len / sizeof(u32);
1568
1569         /* task phase is set to TX_CMD */
1570         task_context->task_phase = 0x1;
1571
1572         /* retry counter */
1573         task_context->stp_retry_count = 0;
1574
1575         /* data transfer size. */
1576         task_context->transfer_length_bytes = task->total_xfer_len;
1577
1578         /* setup sgl */
1579         sci_request_build_sgl(ireq);
1580 }
1581
1582 enum sci_status
1583 sci_io_request_frame_handler(struct isci_request *ireq,
1584                                   u32 frame_index)
1585 {
1586         struct isci_host *ihost = ireq->owning_controller;
1587         struct isci_stp_request *stp_req = &ireq->stp.req;
1588         enum sci_base_request_states state;
1589         enum sci_status status;
1590         ssize_t word_cnt;
1591
1592         state = ireq->sm.current_state_id;
1593         switch (state)  {
1594         case SCI_REQ_STARTED: {
1595                 struct ssp_frame_hdr ssp_hdr;
1596                 void *frame_header;
1597
1598                 sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1599                                                               frame_index,
1600                                                               &frame_header);
1601
1602                 word_cnt = sizeof(struct ssp_frame_hdr) / sizeof(u32);
1603                 sci_swab32_cpy(&ssp_hdr, frame_header, word_cnt);
1604
1605                 if (ssp_hdr.frame_type == SSP_RESPONSE) {
1606                         struct ssp_response_iu *resp_iu;
1607                         ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1608
1609                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1610                                                                       frame_index,
1611                                                                       (void **)&resp_iu);
1612
1613                         sci_swab32_cpy(&ireq->ssp.rsp, resp_iu, word_cnt);
1614
1615                         resp_iu = &ireq->ssp.rsp;
1616
1617                         if (resp_iu->datapres == 0x01 ||
1618                             resp_iu->datapres == 0x02) {
1619                                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1620                                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1621                         } else {
1622                                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1623                                 ireq->sci_status = SCI_SUCCESS;
1624                         }
1625                 } else {
1626                         /* not a response frame, why did it get forwarded? */
1627                         dev_err(&ihost->pdev->dev,
1628                                 "%s: SCIC IO Request 0x%p received unexpected "
1629                                 "frame %d type 0x%02x\n", __func__, ireq,
1630                                 frame_index, ssp_hdr.frame_type);
1631                 }
1632
1633                 /*
1634                  * In any case we are done with this frame buffer return it to
1635                  * the controller
1636                  */
1637                 sci_controller_release_frame(ihost, frame_index);
1638
1639                 return SCI_SUCCESS;
1640         }
1641
1642         case SCI_REQ_TASK_WAIT_TC_RESP:
1643                 sci_io_request_copy_response(ireq);
1644                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1645                 sci_controller_release_frame(ihost, frame_index);
1646                 return SCI_SUCCESS;
1647
1648         case SCI_REQ_SMP_WAIT_RESP: {
1649                 struct sas_task *task = isci_request_access_task(ireq);
1650                 struct scatterlist *sg = &task->smp_task.smp_resp;
1651                 void *frame_header, *kaddr;
1652                 u8 *rsp;
1653
1654                 sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1655                                                          frame_index,
1656                                                          &frame_header);
1657                 kaddr = kmap_atomic(sg_page(sg), KM_IRQ0);
1658                 rsp = kaddr + sg->offset;
1659                 sci_swab32_cpy(rsp, frame_header, 1);
1660
1661                 if (rsp[0] == SMP_RESPONSE) {
1662                         void *smp_resp;
1663
1664                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1665                                                                  frame_index,
1666                                                                  &smp_resp);
1667
1668                         word_cnt = (sg->length/4)-1;
1669                         if (word_cnt > 0)
1670                                 word_cnt = min_t(unsigned int, word_cnt,
1671                                                  SCU_UNSOLICITED_FRAME_BUFFER_SIZE/4);
1672                         sci_swab32_cpy(rsp + 4, smp_resp, word_cnt);
1673
1674                         ireq->scu_status = SCU_TASK_DONE_GOOD;
1675                         ireq->sci_status = SCI_SUCCESS;
1676                         sci_change_state(&ireq->sm, SCI_REQ_SMP_WAIT_TC_COMP);
1677                 } else {
1678                         /*
1679                          * This was not a response frame why did it get
1680                          * forwarded?
1681                          */
1682                         dev_err(&ihost->pdev->dev,
1683                                 "%s: SCIC SMP Request 0x%p received unexpected "
1684                                 "frame %d type 0x%02x\n",
1685                                 __func__,
1686                                 ireq,
1687                                 frame_index,
1688                                 rsp[0]);
1689
1690                         ireq->scu_status = SCU_TASK_DONE_SMP_FRM_TYPE_ERR;
1691                         ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1692                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1693                 }
1694                 kunmap_atomic(kaddr, KM_IRQ0);
1695
1696                 sci_controller_release_frame(ihost, frame_index);
1697
1698                 return SCI_SUCCESS;
1699         }
1700
1701         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
1702                 return sci_stp_request_udma_general_frame_handler(ireq,
1703                                                                        frame_index);
1704
1705         case SCI_REQ_STP_UDMA_WAIT_D2H:
1706                 /* Use the general frame handler to copy the resposne data */
1707                 status = sci_stp_request_udma_general_frame_handler(ireq, frame_index);
1708
1709                 if (status != SCI_SUCCESS)
1710                         return status;
1711
1712                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1713                 ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1714                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1715                 return SCI_SUCCESS;
1716
1717         case SCI_REQ_STP_NON_DATA_WAIT_D2H: {
1718                 struct dev_to_host_fis *frame_header;
1719                 u32 *frame_buffer;
1720
1721                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1722                                                                        frame_index,
1723                                                                        (void **)&frame_header);
1724
1725                 if (status != SCI_SUCCESS) {
1726                         dev_err(&ihost->pdev->dev,
1727                                 "%s: SCIC IO Request 0x%p could not get frame "
1728                                 "header for frame index %d, status %x\n",
1729                                 __func__,
1730                                 stp_req,
1731                                 frame_index,
1732                                 status);
1733
1734                         return status;
1735                 }
1736
1737                 switch (frame_header->fis_type) {
1738                 case FIS_REGD2H:
1739                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1740                                                                       frame_index,
1741                                                                       (void **)&frame_buffer);
1742
1743                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1744                                                                frame_header,
1745                                                                frame_buffer);
1746
1747                         /* The command has completed with error */
1748                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1749                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1750                         break;
1751
1752                 default:
1753                         dev_warn(&ihost->pdev->dev,
1754                                  "%s: IO Request:0x%p Frame Id:%d protocol "
1755                                   "violation occurred\n", __func__, stp_req,
1756                                   frame_index);
1757
1758                         ireq->scu_status = SCU_TASK_DONE_UNEXP_FIS;
1759                         ireq->sci_status = SCI_FAILURE_PROTOCOL_VIOLATION;
1760                         break;
1761                 }
1762
1763                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1764
1765                 /* Frame has been decoded return it to the controller */
1766                 sci_controller_release_frame(ihost, frame_index);
1767
1768                 return status;
1769         }
1770
1771         case SCI_REQ_STP_PIO_WAIT_FRAME: {
1772                 struct sas_task *task = isci_request_access_task(ireq);
1773                 struct dev_to_host_fis *frame_header;
1774                 u32 *frame_buffer;
1775
1776                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1777                                                                        frame_index,
1778                                                                        (void **)&frame_header);
1779
1780                 if (status != SCI_SUCCESS) {
1781                         dev_err(&ihost->pdev->dev,
1782                                 "%s: SCIC IO Request 0x%p could not get frame "
1783                                 "header for frame index %d, status %x\n",
1784                                 __func__, stp_req, frame_index, status);
1785                         return status;
1786                 }
1787
1788                 switch (frame_header->fis_type) {
1789                 case FIS_PIO_SETUP:
1790                         /* Get from the frame buffer the PIO Setup Data */
1791                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1792                                                                       frame_index,
1793                                                                       (void **)&frame_buffer);
1794
1795                         /* Get the data from the PIO Setup The SCU Hardware
1796                          * returns first word in the frame_header and the rest
1797                          * of the data is in the frame buffer so we need to
1798                          * back up one dword
1799                          */
1800
1801                         /* transfer_count: first 16bits in the 4th dword */
1802                         stp_req->pio_len = frame_buffer[3] & 0xffff;
1803
1804                         /* status: 4th byte in the 3rd dword */
1805                         stp_req->status = (frame_buffer[2] >> 24) & 0xff;
1806
1807                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1808                                                                frame_header,
1809                                                                frame_buffer);
1810
1811                         ireq->stp.rsp.status = stp_req->status;
1812
1813                         /* The next state is dependent on whether the
1814                          * request was PIO Data-in or Data out
1815                          */
1816                         if (task->data_dir == DMA_FROM_DEVICE) {
1817                                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_IN);
1818                         } else if (task->data_dir == DMA_TO_DEVICE) {
1819                                 /* Transmit data */
1820                                 status = sci_stp_request_pio_data_out_transmit_data(ireq);
1821                                 if (status != SCI_SUCCESS)
1822                                         break;
1823                                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_OUT);
1824                         }
1825                         break;
1826
1827                 case FIS_SETDEVBITS:
1828                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1829                         break;
1830
1831                 case FIS_REGD2H:
1832                         if (frame_header->status & ATA_BUSY) {
1833                                 /*
1834                                  * Now why is the drive sending a D2H Register
1835                                  * FIS when it is still busy?  Do nothing since
1836                                  * we are still in the right state.
1837                                  */
1838                                 dev_dbg(&ihost->pdev->dev,
1839                                         "%s: SCIC PIO Request 0x%p received "
1840                                         "D2H Register FIS with BSY status "
1841                                         "0x%x\n",
1842                                         __func__,
1843                                         stp_req,
1844                                         frame_header->status);
1845                                 break;
1846                         }
1847
1848                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1849                                                                       frame_index,
1850                                                                       (void **)&frame_buffer);
1851
1852                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1853                                                                frame_header,
1854                                                                frame_buffer);
1855
1856                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1857                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1858                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1859                         break;
1860
1861                 default:
1862                         /* FIXME: what do we do here? */
1863                         break;
1864                 }
1865
1866                 /* Frame is decoded return it to the controller */
1867                 sci_controller_release_frame(ihost, frame_index);
1868
1869                 return status;
1870         }
1871
1872         case SCI_REQ_STP_PIO_DATA_IN: {
1873                 struct dev_to_host_fis *frame_header;
1874                 struct sata_fis_data *frame_buffer;
1875
1876                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1877                                                                        frame_index,
1878                                                                        (void **)&frame_header);
1879
1880                 if (status != SCI_SUCCESS) {
1881                         dev_err(&ihost->pdev->dev,
1882                                 "%s: SCIC IO Request 0x%p could not get frame "
1883                                 "header for frame index %d, status %x\n",
1884                                 __func__,
1885                                 stp_req,
1886                                 frame_index,
1887                                 status);
1888                         return status;
1889                 }
1890
1891                 if (frame_header->fis_type != FIS_DATA) {
1892                         dev_err(&ihost->pdev->dev,
1893                                 "%s: SCIC PIO Request 0x%p received frame %d "
1894                                 "with fis type 0x%02x when expecting a data "
1895                                 "fis.\n",
1896                                 __func__,
1897                                 stp_req,
1898                                 frame_index,
1899                                 frame_header->fis_type);
1900
1901                         ireq->scu_status = SCU_TASK_DONE_GOOD;
1902                         ireq->sci_status = SCI_FAILURE_IO_REQUIRES_SCSI_ABORT;
1903                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1904
1905                         /* Frame is decoded return it to the controller */
1906                         sci_controller_release_frame(ihost, frame_index);
1907                         return status;
1908                 }
1909
1910                 if (stp_req->sgl.index < 0) {
1911                         ireq->saved_rx_frame_index = frame_index;
1912                         stp_req->pio_len = 0;
1913                 } else {
1914                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1915                                                                       frame_index,
1916                                                                       (void **)&frame_buffer);
1917
1918                         status = sci_stp_request_pio_data_in_copy_data(stp_req,
1919                                                                             (u8 *)frame_buffer);
1920
1921                         /* Frame is decoded return it to the controller */
1922                         sci_controller_release_frame(ihost, frame_index);
1923                 }
1924
1925                 /* Check for the end of the transfer, are there more
1926                  * bytes remaining for this data transfer
1927                  */
1928                 if (status != SCI_SUCCESS || stp_req->pio_len != 0)
1929                         return status;
1930
1931                 if ((stp_req->status & ATA_BUSY) == 0) {
1932                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1933                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1934                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1935                 } else {
1936                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1937                 }
1938                 return status;
1939         }
1940
1941         case SCI_REQ_STP_SOFT_RESET_WAIT_D2H: {
1942                 struct dev_to_host_fis *frame_header;
1943                 u32 *frame_buffer;
1944
1945                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1946                                                                        frame_index,
1947                                                                        (void **)&frame_header);
1948                 if (status != SCI_SUCCESS) {
1949                         dev_err(&ihost->pdev->dev,
1950                                 "%s: SCIC IO Request 0x%p could not get frame "
1951                                 "header for frame index %d, status %x\n",
1952                                 __func__,
1953                                 stp_req,
1954                                 frame_index,
1955                                 status);
1956                         return status;
1957                 }
1958
1959                 switch (frame_header->fis_type) {
1960                 case FIS_REGD2H:
1961                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1962                                                                       frame_index,
1963                                                                       (void **)&frame_buffer);
1964
1965                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1966                                                                frame_header,
1967                                                                frame_buffer);
1968
1969                         /* The command has completed with error */
1970                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1971                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1972                         break;
1973
1974                 default:
1975                         dev_warn(&ihost->pdev->dev,
1976                                  "%s: IO Request:0x%p Frame Id:%d protocol "
1977                                  "violation occurred\n",
1978                                  __func__,
1979                                  stp_req,
1980                                  frame_index);
1981
1982                         ireq->scu_status = SCU_TASK_DONE_UNEXP_FIS;
1983                         ireq->sci_status = SCI_FAILURE_PROTOCOL_VIOLATION;
1984                         break;
1985                 }
1986
1987                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1988
1989                 /* Frame has been decoded return it to the controller */
1990                 sci_controller_release_frame(ihost, frame_index);
1991
1992                 return status;
1993         }
1994         case SCI_REQ_ATAPI_WAIT_PIO_SETUP: {
1995                 struct sas_task *task = isci_request_access_task(ireq);
1996
1997                 sci_controller_release_frame(ihost, frame_index);
1998                 ireq->target_device->working_request = ireq;
1999                 if (task->data_dir == DMA_NONE) {
2000                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_TC_COMP);
2001                         scu_atapi_reconstruct_raw_frame_task_context(ireq);
2002                 } else {
2003                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_D2H);
2004                         scu_atapi_construct_task_context(ireq);
2005                 }
2006
2007                 sci_controller_continue_io(ireq);
2008                 return SCI_SUCCESS;
2009         }
2010         case SCI_REQ_ATAPI_WAIT_D2H:
2011                 return atapi_d2h_reg_frame_handler(ireq, frame_index);
2012         case SCI_REQ_ABORTING:
2013                 /*
2014                  * TODO: Is it even possible to get an unsolicited frame in the
2015                  * aborting state?
2016                  */
2017                 sci_controller_release_frame(ihost, frame_index);
2018                 return SCI_SUCCESS;
2019
2020         default:
2021                 dev_warn(&ihost->pdev->dev,
2022                          "%s: SCIC IO Request given unexpected frame %x while "
2023                          "in state %d\n",
2024                          __func__,
2025                          frame_index,
2026                          state);
2027
2028                 sci_controller_release_frame(ihost, frame_index);
2029                 return SCI_FAILURE_INVALID_STATE;
2030         }
2031 }
2032
2033 static enum sci_status stp_request_udma_await_tc_event(struct isci_request *ireq,
2034                                                        u32 completion_code)
2035 {
2036         enum sci_status status = SCI_SUCCESS;
2037
2038         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2039         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2040                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2041                 ireq->sci_status = SCI_SUCCESS;
2042                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2043                 break;
2044         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_FIS):
2045         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
2046                 /* We must check ther response buffer to see if the D2H
2047                  * Register FIS was received before we got the TC
2048                  * completion.
2049                  */
2050                 if (ireq->stp.rsp.fis_type == FIS_REGD2H) {
2051                         sci_remote_device_suspend(ireq->target_device,
2052                                 SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
2053
2054                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
2055                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
2056                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2057                 } else {
2058                         /* If we have an error completion status for the
2059                          * TC then we can expect a D2H register FIS from
2060                          * the device so we must change state to wait
2061                          * for it
2062                          */
2063                         sci_change_state(&ireq->sm, SCI_REQ_STP_UDMA_WAIT_D2H);
2064                 }
2065                 break;
2066
2067         /* TODO Check to see if any of these completion status need to
2068          * wait for the device to host register fis.
2069          */
2070         /* TODO We can retry the command for SCU_TASK_DONE_CMD_LL_R_ERR
2071          * - this comes only for B0
2072          */
2073         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_INV_FIS_LEN):
2074         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
2075         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_R_ERR):
2076         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CMD_LL_R_ERR):
2077                 sci_remote_device_suspend(ireq->target_device,
2078                         SCU_EVENT_SPECIFIC(SCU_NORMALIZE_COMPLETION_STATUS(completion_code)));
2079                 /* Fall through to the default case */
2080         default:
2081                 /* All other completion status cause the IO to be complete. */
2082                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2083                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2084                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2085                 break;
2086         }
2087
2088         return status;
2089 }
2090
2091 static enum sci_status
2092 stp_request_soft_reset_await_h2d_asserted_tc_event(struct isci_request *ireq,
2093                                                    u32 completion_code)
2094 {
2095         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2096         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2097                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2098                 ireq->sci_status = SCI_SUCCESS;
2099                 sci_change_state(&ireq->sm, SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG);
2100                 break;
2101
2102         default:
2103                 /*
2104                  * All other completion status cause the IO to be complete.
2105                  * If a NAK was received, then it is up to the user to retry
2106                  * the request.
2107                  */
2108                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2109                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2110                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2111                 break;
2112         }
2113
2114         return SCI_SUCCESS;
2115 }
2116
2117 static enum sci_status
2118 stp_request_soft_reset_await_h2d_diagnostic_tc_event(struct isci_request *ireq,
2119                                                      u32 completion_code)
2120 {
2121         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2122         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2123                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2124                 ireq->sci_status = SCI_SUCCESS;
2125                 sci_change_state(&ireq->sm, SCI_REQ_STP_SOFT_RESET_WAIT_D2H);
2126                 break;
2127
2128         default:
2129                 /* All other completion status cause the IO to be complete.  If
2130                  * a NAK was received, then it is up to the user to retry the
2131                  * request.
2132                  */
2133                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2134                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2135                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2136                 break;
2137         }
2138
2139         return SCI_SUCCESS;
2140 }
2141
2142 static enum sci_status atapi_raw_completion(struct isci_request *ireq, u32 completion_code,
2143                                                   enum sci_base_request_states next)
2144 {
2145         enum sci_status status = SCI_SUCCESS;
2146
2147         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2148         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2149                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2150                 ireq->sci_status = SCI_SUCCESS;
2151                 sci_change_state(&ireq->sm, next);
2152                 break;
2153         default:
2154                 /* All other completion status cause the IO to be complete.
2155                  * If a NAK was received, then it is up to the user to retry
2156                  * the request.
2157                  */
2158                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2159                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2160
2161                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2162                 break;
2163         }
2164
2165         return status;
2166 }
2167
2168 static enum sci_status atapi_data_tc_completion_handler(struct isci_request *ireq,
2169                                                         u32 completion_code)
2170 {
2171         struct isci_remote_device *idev = ireq->target_device;
2172         struct dev_to_host_fis *d2h = &ireq->stp.rsp;
2173         enum sci_status status = SCI_SUCCESS;
2174
2175         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2176         case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
2177                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2178                 break;
2179
2180         case (SCU_TASK_DONE_UNEXP_FIS << SCU_COMPLETION_TL_STATUS_SHIFT): {
2181                 u16 len = sci_req_tx_bytes(ireq);
2182
2183                 /* likely non-error data underrrun, workaround missing
2184                  * d2h frame from the controller
2185                  */
2186                 if (d2h->fis_type != FIS_REGD2H) {
2187                         d2h->fis_type = FIS_REGD2H;
2188                         d2h->flags = (1 << 6);
2189                         d2h->status = 0x50;
2190                         d2h->error = 0;
2191                         d2h->lbal = 0;
2192                         d2h->byte_count_low = len & 0xff;
2193                         d2h->byte_count_high = len >> 8;
2194                         d2h->device = 0xa0;
2195                         d2h->lbal_exp = 0;
2196                         d2h->lbam_exp = 0;
2197                         d2h->lbah_exp = 0;
2198                         d2h->_r_a = 0;
2199                         d2h->sector_count = 0x3;
2200                         d2h->sector_count_exp = 0;
2201                         d2h->_r_b = 0;
2202                         d2h->_r_c = 0;
2203                         d2h->_r_d = 0;
2204                 }
2205
2206                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2207                 ireq->sci_status = SCI_SUCCESS_IO_DONE_EARLY;
2208                 status = ireq->sci_status;
2209
2210                 /* the hw will have suspended the rnc, so complete the
2211                  * request upon pending resume
2212                  */
2213                 sci_change_state(&idev->sm, SCI_STP_DEV_ATAPI_ERROR);
2214                 break;
2215         }
2216         case (SCU_TASK_DONE_EXCESS_DATA << SCU_COMPLETION_TL_STATUS_SHIFT):
2217                 /* In this case, there is no UF coming after.
2218                  * compelte the IO now.
2219                  */
2220                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2221                 ireq->sci_status = SCI_SUCCESS;
2222                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2223                 break;
2224
2225         default:
2226                 if (d2h->fis_type == FIS_REGD2H) {
2227                         /* UF received change the device state to ATAPI_ERROR */
2228                         status = ireq->sci_status;
2229                         sci_change_state(&idev->sm, SCI_STP_DEV_ATAPI_ERROR);
2230                 } else {
2231                         /* If receiving any non-sucess TC status, no UF
2232                          * received yet, then an UF for the status fis
2233                          * is coming after (XXX: suspect this is
2234                          * actually a protocol error or a bug like the
2235                          * DONE_UNEXP_FIS case)
2236                          */
2237                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
2238                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
2239
2240                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_D2H);
2241                 }
2242                 break;
2243         }
2244
2245         return status;
2246 }
2247
2248 enum sci_status
2249 sci_io_request_tc_completion(struct isci_request *ireq,
2250                                   u32 completion_code)
2251 {
2252         enum sci_base_request_states state;
2253         struct isci_host *ihost = ireq->owning_controller;
2254
2255         state = ireq->sm.current_state_id;
2256
2257         switch (state) {
2258         case SCI_REQ_STARTED:
2259                 return request_started_state_tc_event(ireq, completion_code);
2260
2261         case SCI_REQ_TASK_WAIT_TC_COMP:
2262                 return ssp_task_request_await_tc_event(ireq,
2263                                                        completion_code);
2264
2265         case SCI_REQ_SMP_WAIT_RESP:
2266                 return smp_request_await_response_tc_event(ireq,
2267                                                            completion_code);
2268
2269         case SCI_REQ_SMP_WAIT_TC_COMP:
2270                 return smp_request_await_tc_event(ireq, completion_code);
2271
2272         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
2273                 return stp_request_udma_await_tc_event(ireq,
2274                                                        completion_code);
2275
2276         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
2277                 return stp_request_non_data_await_h2d_tc_event(ireq,
2278                                                                completion_code);
2279
2280         case SCI_REQ_STP_PIO_WAIT_H2D:
2281                 return stp_request_pio_await_h2d_completion_tc_event(ireq,
2282                                                                      completion_code);
2283
2284         case SCI_REQ_STP_PIO_DATA_OUT:
2285                 return pio_data_out_tx_done_tc_event(ireq, completion_code);
2286
2287         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED:
2288                 return stp_request_soft_reset_await_h2d_asserted_tc_event(ireq,
2289                                                                           completion_code);
2290
2291         case SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG:
2292                 return stp_request_soft_reset_await_h2d_diagnostic_tc_event(ireq,
2293                                                                             completion_code);
2294
2295         case SCI_REQ_ABORTING:
2296                 return request_aborting_state_tc_event(ireq,
2297                                                        completion_code);
2298
2299         case SCI_REQ_ATAPI_WAIT_H2D:
2300                 return atapi_raw_completion(ireq, completion_code,
2301                                             SCI_REQ_ATAPI_WAIT_PIO_SETUP);
2302
2303         case SCI_REQ_ATAPI_WAIT_TC_COMP:
2304                 return atapi_raw_completion(ireq, completion_code,
2305                                             SCI_REQ_ATAPI_WAIT_D2H);
2306
2307         case SCI_REQ_ATAPI_WAIT_D2H:
2308                 return atapi_data_tc_completion_handler(ireq, completion_code);
2309
2310         default:
2311                 dev_warn(&ihost->pdev->dev,
2312                          "%s: SCIC IO Request given task completion "
2313                          "notification %x while in wrong state %d\n",
2314                          __func__,
2315                          completion_code,
2316                          state);
2317                 return SCI_FAILURE_INVALID_STATE;
2318         }
2319 }
2320
2321 /**
2322  * isci_request_process_response_iu() - This function sets the status and
2323  *    response iu, in the task struct, from the request object for the upper
2324  *    layer driver.
2325  * @sas_task: This parameter is the task struct from the upper layer driver.
2326  * @resp_iu: This parameter points to the response iu of the completed request.
2327  * @dev: This parameter specifies the linux device struct.
2328  *
2329  * none.
2330  */
2331 static void isci_request_process_response_iu(
2332         struct sas_task *task,
2333         struct ssp_response_iu *resp_iu,
2334         struct device *dev)
2335 {
2336         dev_dbg(dev,
2337                 "%s: resp_iu = %p "
2338                 "resp_iu->status = 0x%x,\nresp_iu->datapres = %d "
2339                 "resp_iu->response_data_len = %x, "
2340                 "resp_iu->sense_data_len = %x\nrepsonse data: ",
2341                 __func__,
2342                 resp_iu,
2343                 resp_iu->status,
2344                 resp_iu->datapres,
2345                 resp_iu->response_data_len,
2346                 resp_iu->sense_data_len);
2347
2348         task->task_status.stat = resp_iu->status;
2349
2350         /* libsas updates the task status fields based on the response iu. */
2351         sas_ssp_task_response(dev, task, resp_iu);
2352 }
2353
2354 /**
2355  * isci_request_set_open_reject_status() - This function prepares the I/O
2356  *    completion for OPEN_REJECT conditions.
2357  * @request: This parameter is the completed isci_request object.
2358  * @response_ptr: This parameter specifies the service response for the I/O.
2359  * @status_ptr: This parameter specifies the exec status for the I/O.
2360  * @complete_to_host_ptr: This parameter specifies the action to be taken by
2361  *    the LLDD with respect to completing this request or forcing an abort
2362  *    condition on the I/O.
2363  * @open_rej_reason: This parameter specifies the encoded reason for the
2364  *    abandon-class reject.
2365  *
2366  * none.
2367  */
2368 static void isci_request_set_open_reject_status(
2369         struct isci_request *request,
2370         struct sas_task *task,
2371         enum service_response *response_ptr,
2372         enum exec_status *status_ptr,
2373         enum isci_completion_selection *complete_to_host_ptr,
2374         enum sas_open_rej_reason open_rej_reason)
2375 {
2376         /* Task in the target is done. */
2377         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2378         *response_ptr                     = SAS_TASK_UNDELIVERED;
2379         *status_ptr                       = SAS_OPEN_REJECT;
2380         *complete_to_host_ptr             = isci_perform_normal_io_completion;
2381         task->task_status.open_rej_reason = open_rej_reason;
2382 }
2383
2384 /**
2385  * isci_request_handle_controller_specific_errors() - This function decodes
2386  *    controller-specific I/O completion error conditions.
2387  * @request: This parameter is the completed isci_request object.
2388  * @response_ptr: This parameter specifies the service response for the I/O.
2389  * @status_ptr: This parameter specifies the exec status for the I/O.
2390  * @complete_to_host_ptr: This parameter specifies the action to be taken by
2391  *    the LLDD with respect to completing this request or forcing an abort
2392  *    condition on the I/O.
2393  *
2394  * none.
2395  */
2396 static void isci_request_handle_controller_specific_errors(
2397         struct isci_remote_device *idev,
2398         struct isci_request *request,
2399         struct sas_task *task,
2400         enum service_response *response_ptr,
2401         enum exec_status *status_ptr,
2402         enum isci_completion_selection *complete_to_host_ptr)
2403 {
2404         unsigned int cstatus;
2405
2406         cstatus = request->scu_status;
2407
2408         dev_dbg(&request->isci_host->pdev->dev,
2409                 "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
2410                 "- controller status = 0x%x\n",
2411                 __func__, request, cstatus);
2412
2413         /* Decode the controller-specific errors; most
2414          * important is to recognize those conditions in which
2415          * the target may still have a task outstanding that
2416          * must be aborted.
2417          *
2418          * Note that there are SCU completion codes being
2419          * named in the decode below for which SCIC has already
2420          * done work to handle them in a way other than as
2421          * a controller-specific completion code; these are left
2422          * in the decode below for completeness sake.
2423          */
2424         switch (cstatus) {
2425         case SCU_TASK_DONE_DMASETUP_DIRERR:
2426         /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */
2427         case SCU_TASK_DONE_XFERCNT_ERR:
2428                 /* Also SCU_TASK_DONE_SMP_UFI_ERR: */
2429                 if (task->task_proto == SAS_PROTOCOL_SMP) {
2430                         /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */
2431                         *response_ptr = SAS_TASK_COMPLETE;
2432
2433                         /* See if the device has been/is being stopped. Note
2434                          * that we ignore the quiesce state, since we are
2435                          * concerned about the actual device state.
2436                          */
2437                         if (!idev)
2438                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2439                         else
2440                                 *status_ptr = SAS_ABORTED_TASK;
2441
2442                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2443
2444                         *complete_to_host_ptr =
2445                                 isci_perform_normal_io_completion;
2446                 } else {
2447                         /* Task in the target is not done. */
2448                         *response_ptr = SAS_TASK_UNDELIVERED;
2449
2450                         if (!idev)
2451                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2452                         else
2453                                 *status_ptr = SAM_STAT_TASK_ABORTED;
2454
2455                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2456
2457                         *complete_to_host_ptr =
2458                                 isci_perform_error_io_completion;
2459                 }
2460
2461                 break;
2462
2463         case SCU_TASK_DONE_CRC_ERR:
2464         case SCU_TASK_DONE_NAK_CMD_ERR:
2465         case SCU_TASK_DONE_EXCESS_DATA:
2466         case SCU_TASK_DONE_UNEXP_FIS:
2467         /* Also SCU_TASK_DONE_UNEXP_RESP: */
2468         case SCU_TASK_DONE_VIIT_ENTRY_NV:       /* TODO - conditions? */
2469         case SCU_TASK_DONE_IIT_ENTRY_NV:        /* TODO - conditions? */
2470         case SCU_TASK_DONE_RNCNV_OUTBOUND:      /* TODO - conditions? */
2471                 /* These are conditions in which the target
2472                  * has completed the task, so that no cleanup
2473                  * is necessary.
2474                  */
2475                 *response_ptr = SAS_TASK_COMPLETE;
2476
2477                 /* See if the device has been/is being stopped. Note
2478                  * that we ignore the quiesce state, since we are
2479                  * concerned about the actual device state.
2480                  */
2481                 if (!idev)
2482                         *status_ptr = SAS_DEVICE_UNKNOWN;
2483                 else
2484                         *status_ptr = SAS_ABORTED_TASK;
2485
2486                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2487
2488                 *complete_to_host_ptr = isci_perform_normal_io_completion;
2489                 break;
2490
2491
2492         /* Note that the only open reject completion codes seen here will be
2493          * abandon-class codes; all others are automatically retried in the SCU.
2494          */
2495         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2496
2497                 isci_request_set_open_reject_status(
2498                         request, task, response_ptr, status_ptr,
2499                         complete_to_host_ptr, SAS_OREJ_WRONG_DEST);
2500                 break;
2501
2502         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2503
2504                 /* Note - the return of AB0 will change when
2505                  * libsas implements detection of zone violations.
2506                  */
2507                 isci_request_set_open_reject_status(
2508                         request, task, response_ptr, status_ptr,
2509                         complete_to_host_ptr, SAS_OREJ_RESV_AB0);
2510                 break;
2511
2512         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2513
2514                 isci_request_set_open_reject_status(
2515                         request, task, response_ptr, status_ptr,
2516                         complete_to_host_ptr, SAS_OREJ_RESV_AB1);
2517                 break;
2518
2519         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2520
2521                 isci_request_set_open_reject_status(
2522                         request, task, response_ptr, status_ptr,
2523                         complete_to_host_ptr, SAS_OREJ_RESV_AB2);
2524                 break;
2525
2526         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2527
2528                 isci_request_set_open_reject_status(
2529                         request, task, response_ptr, status_ptr,
2530                         complete_to_host_ptr, SAS_OREJ_RESV_AB3);
2531                 break;
2532
2533         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2534
2535                 isci_request_set_open_reject_status(
2536                         request, task, response_ptr, status_ptr,
2537                         complete_to_host_ptr, SAS_OREJ_BAD_DEST);
2538                 break;
2539
2540         case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
2541
2542                 isci_request_set_open_reject_status(
2543                         request, task, response_ptr, status_ptr,
2544                         complete_to_host_ptr, SAS_OREJ_STP_NORES);
2545                 break;
2546
2547         case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
2548
2549                 isci_request_set_open_reject_status(
2550                         request, task, response_ptr, status_ptr,
2551                         complete_to_host_ptr, SAS_OREJ_EPROTO);
2552                 break;
2553
2554         case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
2555
2556                 isci_request_set_open_reject_status(
2557                         request, task, response_ptr, status_ptr,
2558                         complete_to_host_ptr, SAS_OREJ_CONN_RATE);
2559                 break;
2560
2561         case SCU_TASK_DONE_LL_R_ERR:
2562         /* Also SCU_TASK_DONE_ACK_NAK_TO: */
2563         case SCU_TASK_DONE_LL_PERR:
2564         case SCU_TASK_DONE_LL_SY_TERM:
2565         /* Also SCU_TASK_DONE_NAK_ERR:*/
2566         case SCU_TASK_DONE_LL_LF_TERM:
2567         /* Also SCU_TASK_DONE_DATA_LEN_ERR: */
2568         case SCU_TASK_DONE_LL_ABORT_ERR:
2569         case SCU_TASK_DONE_SEQ_INV_TYPE:
2570         /* Also SCU_TASK_DONE_UNEXP_XR: */
2571         case SCU_TASK_DONE_XR_IU_LEN_ERR:
2572         case SCU_TASK_DONE_INV_FIS_LEN:
2573         /* Also SCU_TASK_DONE_XR_WD_LEN: */
2574         case SCU_TASK_DONE_SDMA_ERR:
2575         case SCU_TASK_DONE_OFFSET_ERR:
2576         case SCU_TASK_DONE_MAX_PLD_ERR:
2577         case SCU_TASK_DONE_LF_ERR:
2578         case SCU_TASK_DONE_SMP_RESP_TO_ERR:  /* Escalate to dev reset? */
2579         case SCU_TASK_DONE_SMP_LL_RX_ERR:
2580         case SCU_TASK_DONE_UNEXP_DATA:
2581         case SCU_TASK_DONE_UNEXP_SDBFIS:
2582         case SCU_TASK_DONE_REG_ERR:
2583         case SCU_TASK_DONE_SDB_ERR:
2584         case SCU_TASK_DONE_TASK_ABORT:
2585         default:
2586                 /* Task in the target is not done. */
2587                 *response_ptr = SAS_TASK_UNDELIVERED;
2588                 *status_ptr = SAM_STAT_TASK_ABORTED;
2589
2590                 if (task->task_proto == SAS_PROTOCOL_SMP) {
2591                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2592
2593                         *complete_to_host_ptr = isci_perform_normal_io_completion;
2594                 } else {
2595                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2596
2597                         *complete_to_host_ptr = isci_perform_error_io_completion;
2598                 }
2599                 break;
2600         }
2601 }
2602
2603 /**
2604  * isci_task_save_for_upper_layer_completion() - This function saves the
2605  *    request for later completion to the upper layer driver.
2606  * @host: This parameter is a pointer to the host on which the the request
2607  *    should be queued (either as an error or success).
2608  * @request: This parameter is the completed request.
2609  * @response: This parameter is the response code for the completed task.
2610  * @status: This parameter is the status code for the completed task.
2611  *
2612  * none.
2613  */
2614 static void isci_task_save_for_upper_layer_completion(
2615         struct isci_host *host,
2616         struct isci_request *request,
2617         enum service_response response,
2618         enum exec_status status,
2619         enum isci_completion_selection task_notification_selection)
2620 {
2621         struct sas_task *task = isci_request_access_task(request);
2622
2623         task_notification_selection
2624                 = isci_task_set_completion_status(task, response, status,
2625                                                   task_notification_selection);
2626
2627         /* Tasks aborted specifically by a call to the lldd_abort_task
2628          * function should not be completed to the host in the regular path.
2629          */
2630         switch (task_notification_selection) {
2631
2632         case isci_perform_normal_io_completion:
2633                 /* Normal notification (task_done) */
2634
2635                 /* Add to the completed list. */
2636                 list_add(&request->completed_node,
2637                          &host->requests_to_complete);
2638
2639                 /* Take the request off the device's pending request list. */
2640                 list_del_init(&request->dev_node);
2641                 break;
2642
2643         case isci_perform_aborted_io_completion:
2644                 /* No notification to libsas because this request is
2645                  * already in the abort path.
2646                  */
2647                 /* Wake up whatever process was waiting for this
2648                  * request to complete.
2649                  */
2650                 WARN_ON(request->io_request_completion == NULL);
2651
2652                 if (request->io_request_completion != NULL) {
2653
2654                         /* Signal whoever is waiting that this
2655                         * request is complete.
2656                         */
2657                         complete(request->io_request_completion);
2658                 }
2659                 break;
2660
2661         case isci_perform_error_io_completion:
2662                 /* Use sas_task_abort */
2663                 /* Add to the aborted list. */
2664                 list_add(&request->completed_node,
2665                          &host->requests_to_errorback);
2666                 break;
2667
2668         default:
2669                 /* Add to the error to libsas list. */
2670                 list_add(&request->completed_node,
2671                          &host->requests_to_errorback);
2672                 break;
2673         }
2674         dev_dbg(&host->pdev->dev,
2675                 "%s: %d - task = %p, response=%d (%d), status=%d (%d)\n",
2676                 __func__, task_notification_selection, task,
2677                 (task) ? task->task_status.resp : 0, response,
2678                 (task) ? task->task_status.stat : 0, status);
2679 }
2680
2681 static void isci_process_stp_response(struct sas_task *task, struct dev_to_host_fis *fis)
2682 {
2683         struct task_status_struct *ts = &task->task_status;
2684         struct ata_task_resp *resp = (void *)&ts->buf[0];
2685
2686         resp->frame_len = sizeof(*fis);
2687         memcpy(resp->ending_fis, fis, sizeof(*fis));
2688         ts->buf_valid_size = sizeof(*resp);
2689
2690         /* If the device fault bit is set in the status register, then
2691          * set the sense data and return.
2692          */
2693         if (fis->status & ATA_DF)
2694                 ts->stat = SAS_PROTO_RESPONSE;
2695         else if (fis->status & ATA_ERR)
2696                 ts->stat = SAM_STAT_CHECK_CONDITION;
2697         else
2698                 ts->stat = SAM_STAT_GOOD;
2699
2700         ts->resp = SAS_TASK_COMPLETE;
2701 }
2702
2703 static void isci_request_io_request_complete(struct isci_host *ihost,
2704                                              struct isci_request *request,
2705                                              enum sci_io_status completion_status)
2706 {
2707         struct sas_task *task = isci_request_access_task(request);
2708         struct ssp_response_iu *resp_iu;
2709         unsigned long task_flags;
2710         struct isci_remote_device *idev = request->target_device;
2711         enum service_response response = SAS_TASK_UNDELIVERED;
2712         enum exec_status status = SAS_ABORTED_TASK;
2713         enum isci_request_status request_status;
2714         enum isci_completion_selection complete_to_host
2715                 = isci_perform_normal_io_completion;
2716
2717         dev_dbg(&ihost->pdev->dev,
2718                 "%s: request = %p, task = %p,\n"
2719                 "task->data_dir = %d completion_status = 0x%x\n",
2720                 __func__,
2721                 request,
2722                 task,
2723                 task->data_dir,
2724                 completion_status);
2725
2726         spin_lock(&request->state_lock);
2727         request_status = request->status;
2728
2729         /* Decode the request status.  Note that if the request has been
2730          * aborted by a task management function, we don't care
2731          * what the status is.
2732          */
2733         switch (request_status) {
2734
2735         case aborted:
2736                 /* "aborted" indicates that the request was aborted by a task
2737                  * management function, since once a task management request is
2738                  * perfomed by the device, the request only completes because
2739                  * of the subsequent driver terminate.
2740                  *
2741                  * Aborted also means an external thread is explicitly managing
2742                  * this request, so that we do not complete it up the stack.
2743                  *
2744                  * The target is still there (since the TMF was successful).
2745                  */
2746                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2747                 response = SAS_TASK_COMPLETE;
2748
2749                 /* See if the device has been/is being stopped. Note
2750                  * that we ignore the quiesce state, since we are
2751                  * concerned about the actual device state.
2752                  */
2753                 if (!idev)
2754                         status = SAS_DEVICE_UNKNOWN;
2755                 else
2756                         status = SAS_ABORTED_TASK;
2757
2758                 complete_to_host = isci_perform_aborted_io_completion;
2759                 /* This was an aborted request. */
2760
2761                 spin_unlock(&request->state_lock);
2762                 break;
2763
2764         case aborting:
2765                 /* aborting means that the task management function tried and
2766                  * failed to abort the request. We need to note the request
2767                  * as SAS_TASK_UNDELIVERED, so that the scsi mid layer marks the
2768                  * target as down.
2769                  *
2770                  * Aborting also means an external thread is explicitly managing
2771                  * this request, so that we do not complete it up the stack.
2772                  */
2773                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2774                 response = SAS_TASK_UNDELIVERED;
2775
2776                 if (!idev)
2777                         /* The device has been /is being stopped. Note that
2778                          * we ignore the quiesce state, since we are
2779                          * concerned about the actual device state.
2780                          */
2781                         status = SAS_DEVICE_UNKNOWN;
2782                 else
2783                         status = SAS_PHY_DOWN;
2784
2785                 complete_to_host = isci_perform_aborted_io_completion;
2786
2787                 /* This was an aborted request. */
2788
2789                 spin_unlock(&request->state_lock);
2790                 break;
2791
2792         case terminating:
2793
2794                 /* This was an terminated request.  This happens when
2795                  * the I/O is being terminated because of an action on
2796                  * the device (reset, tear down, etc.), and the I/O needs
2797                  * to be completed up the stack.
2798                  */
2799                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2800                 response = SAS_TASK_UNDELIVERED;
2801
2802                 /* See if the device has been/is being stopped. Note
2803                  * that we ignore the quiesce state, since we are
2804                  * concerned about the actual device state.
2805                  */
2806                 if (!idev)
2807                         status = SAS_DEVICE_UNKNOWN;
2808                 else
2809                         status = SAS_ABORTED_TASK;
2810
2811                 complete_to_host = isci_perform_aborted_io_completion;
2812
2813                 /* This was a terminated request. */
2814
2815                 spin_unlock(&request->state_lock);
2816                 break;
2817
2818         case dead:
2819                 /* This was a terminated request that timed-out during the
2820                  * termination process.  There is no task to complete to
2821                  * libsas.
2822                  */
2823                 complete_to_host = isci_perform_normal_io_completion;
2824                 spin_unlock(&request->state_lock);
2825                 break;
2826
2827         default:
2828
2829                 /* The request is done from an SCU HW perspective. */
2830                 request->status = completed;
2831
2832                 spin_unlock(&request->state_lock);
2833
2834                 /* This is an active request being completed from the core. */
2835                 switch (completion_status) {
2836
2837                 case SCI_IO_FAILURE_RESPONSE_VALID:
2838                         dev_dbg(&ihost->pdev->dev,
2839                                 "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n",
2840                                 __func__,
2841                                 request,
2842                                 task);
2843
2844                         if (sas_protocol_ata(task->task_proto)) {
2845                                 isci_process_stp_response(task, &request->stp.rsp);
2846                         } else if (SAS_PROTOCOL_SSP == task->task_proto) {
2847
2848                                 /* crack the iu response buffer. */
2849                                 resp_iu = &request->ssp.rsp;
2850                                 isci_request_process_response_iu(task, resp_iu,
2851                                                                  &ihost->pdev->dev);
2852
2853                         } else if (SAS_PROTOCOL_SMP == task->task_proto) {
2854
2855                                 dev_err(&ihost->pdev->dev,
2856                                         "%s: SCI_IO_FAILURE_RESPONSE_VALID: "
2857                                         "SAS_PROTOCOL_SMP protocol\n",
2858                                         __func__);
2859
2860                         } else
2861                                 dev_err(&ihost->pdev->dev,
2862                                         "%s: unknown protocol\n", __func__);
2863
2864                         /* use the task status set in the task struct by the
2865                          * isci_request_process_response_iu call.
2866                          */
2867                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2868                         response = task->task_status.resp;
2869                         status = task->task_status.stat;
2870                         break;
2871
2872                 case SCI_IO_SUCCESS:
2873                 case SCI_IO_SUCCESS_IO_DONE_EARLY:
2874
2875                         response = SAS_TASK_COMPLETE;
2876                         status   = SAM_STAT_GOOD;
2877                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2878
2879                         if (completion_status == SCI_IO_SUCCESS_IO_DONE_EARLY) {
2880
2881                                 /* This was an SSP / STP / SATA transfer.
2882                                  * There is a possibility that less data than
2883                                  * the maximum was transferred.
2884                                  */
2885                                 u32 transferred_length = sci_req_tx_bytes(request);
2886
2887                                 task->task_status.residual
2888                                         = task->total_xfer_len - transferred_length;
2889
2890                                 /* If there were residual bytes, call this an
2891                                  * underrun.
2892                                  */
2893                                 if (task->task_status.residual != 0)
2894                                         status = SAS_DATA_UNDERRUN;
2895
2896                                 dev_dbg(&ihost->pdev->dev,
2897                                         "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n",
2898                                         __func__,
2899                                         status);
2900
2901                         } else
2902                                 dev_dbg(&ihost->pdev->dev,
2903                                         "%s: SCI_IO_SUCCESS\n",
2904                                         __func__);
2905
2906                         break;
2907
2908                 case SCI_IO_FAILURE_TERMINATED:
2909                         dev_dbg(&ihost->pdev->dev,
2910                                 "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n",
2911                                 __func__,
2912                                 request,
2913                                 task);
2914
2915                         /* The request was terminated explicitly.  No handling
2916                          * is needed in the SCSI error handler path.
2917                          */
2918                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2919                         response = SAS_TASK_UNDELIVERED;
2920
2921                         /* See if the device has been/is being stopped. Note
2922                          * that we ignore the quiesce state, since we are
2923                          * concerned about the actual device state.
2924                          */
2925                         if (!idev)
2926                                 status = SAS_DEVICE_UNKNOWN;
2927                         else
2928                                 status = SAS_ABORTED_TASK;
2929
2930                         complete_to_host = isci_perform_normal_io_completion;
2931                         break;
2932
2933                 case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
2934
2935                         isci_request_handle_controller_specific_errors(
2936                                 idev, request, task, &response, &status,
2937                                 &complete_to_host);
2938
2939                         break;
2940
2941                 case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
2942                         /* This is a special case, in that the I/O completion
2943                          * is telling us that the device needs a reset.
2944                          * In order for the device reset condition to be
2945                          * noticed, the I/O has to be handled in the error
2946                          * handler.  Set the reset flag and cause the
2947                          * SCSI error thread to be scheduled.
2948                          */
2949                         spin_lock_irqsave(&task->task_state_lock, task_flags);
2950                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
2951                         spin_unlock_irqrestore(&task->task_state_lock, task_flags);
2952
2953                         /* Fail the I/O. */
2954                         response = SAS_TASK_UNDELIVERED;
2955                         status = SAM_STAT_TASK_ABORTED;
2956
2957                         complete_to_host = isci_perform_error_io_completion;
2958                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2959                         break;
2960
2961                 case SCI_FAILURE_RETRY_REQUIRED:
2962
2963                         /* Fail the I/O so it can be retried. */
2964                         response = SAS_TASK_UNDELIVERED;
2965                         if (!idev)
2966                                 status = SAS_DEVICE_UNKNOWN;
2967                         else
2968                                 status = SAS_ABORTED_TASK;
2969
2970                         complete_to_host = isci_perform_normal_io_completion;
2971                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2972                         break;
2973
2974
2975                 default:
2976                         /* Catch any otherwise unhandled error codes here. */
2977                         dev_dbg(&ihost->pdev->dev,
2978                                  "%s: invalid completion code: 0x%x - "
2979                                  "isci_request = %p\n",
2980                                  __func__, completion_status, request);
2981
2982                         response = SAS_TASK_UNDELIVERED;
2983
2984                         /* See if the device has been/is being stopped. Note
2985                          * that we ignore the quiesce state, since we are
2986                          * concerned about the actual device state.
2987                          */
2988                         if (!idev)
2989                                 status = SAS_DEVICE_UNKNOWN;
2990                         else
2991                                 status = SAS_ABORTED_TASK;
2992
2993                         if (SAS_PROTOCOL_SMP == task->task_proto) {
2994                                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2995                                 complete_to_host = isci_perform_normal_io_completion;
2996                         } else {
2997                                 clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2998                                 complete_to_host = isci_perform_error_io_completion;
2999                         }
3000                         break;
3001                 }
3002                 break;
3003         }
3004
3005         switch (task->task_proto) {
3006         case SAS_PROTOCOL_SSP:
3007                 if (task->data_dir == DMA_NONE)
3008                         break;
3009                 if (task->num_scatter == 0)
3010                         /* 0 indicates a single dma address */
3011                         dma_unmap_single(&ihost->pdev->dev,
3012                                          request->zero_scatter_daddr,
3013                                          task->total_xfer_len, task->data_dir);
3014                 else  /* unmap the sgl dma addresses */
3015                         dma_unmap_sg(&ihost->pdev->dev, task->scatter,
3016                                      request->num_sg_entries, task->data_dir);
3017                 break;
3018         case SAS_PROTOCOL_SMP: {
3019                 struct scatterlist *sg = &task->smp_task.smp_req;
3020                 struct smp_req *smp_req;
3021                 void *kaddr;
3022
3023                 dma_unmap_sg(&ihost->pdev->dev, sg, 1, DMA_TO_DEVICE);
3024
3025                 /* need to swab it back in case the command buffer is re-used */
3026                 kaddr = kmap_atomic(sg_page(sg), KM_IRQ0);
3027                 smp_req = kaddr + sg->offset;
3028                 sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
3029                 kunmap_atomic(kaddr, KM_IRQ0);
3030                 break;
3031         }
3032         default:
3033                 break;
3034         }
3035
3036         /* Put the completed request on the correct list */
3037         isci_task_save_for_upper_layer_completion(ihost, request, response,
3038                                                   status, complete_to_host
3039                                                   );
3040
3041         /* complete the io request to the core. */
3042         sci_controller_complete_io(ihost, request->target_device, request);
3043
3044         /* set terminated handle so it cannot be completed or
3045          * terminated again, and to cause any calls into abort
3046          * task to recognize the already completed case.
3047          */
3048         set_bit(IREQ_TERMINATED, &request->flags);
3049 }
3050
3051 static void sci_request_started_state_enter(struct sci_base_state_machine *sm)
3052 {
3053         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3054         struct domain_device *dev = ireq->target_device->domain_dev;
3055         enum sci_base_request_states state;
3056         struct sas_task *task;
3057
3058         /* XXX as hch said always creating an internal sas_task for tmf
3059          * requests would simplify the driver
3060          */
3061         task = (test_bit(IREQ_TMF, &ireq->flags)) ? NULL : isci_request_access_task(ireq);
3062
3063         /* all unaccelerated request types (non ssp or ncq) handled with
3064          * substates
3065          */
3066         if (!task && dev->dev_type == SAS_END_DEV) {
3067                 state = SCI_REQ_TASK_WAIT_TC_COMP;
3068         } else if (!task &&
3069                    (isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_high ||
3070                     isci_request_access_tmf(ireq)->tmf_code == isci_tmf_sata_srst_low)) {
3071                 state = SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED;
3072         } else if (task && task->task_proto == SAS_PROTOCOL_SMP) {
3073                 state = SCI_REQ_SMP_WAIT_RESP;
3074         } else if (task && sas_protocol_ata(task->task_proto) &&
3075                    !task->ata_task.use_ncq) {
3076                 if (dev->sata_dev.command_set == ATAPI_COMMAND_SET &&
3077                         task->ata_task.fis.command == ATA_CMD_PACKET) {
3078                         state = SCI_REQ_ATAPI_WAIT_H2D;
3079                 } else if (task->data_dir == DMA_NONE) {
3080                         state = SCI_REQ_STP_NON_DATA_WAIT_H2D;
3081                 } else if (task->ata_task.dma_xfer) {
3082                         state = SCI_REQ_STP_UDMA_WAIT_TC_COMP;
3083                 } else /* PIO */ {
3084                         state = SCI_REQ_STP_PIO_WAIT_H2D;
3085                 }
3086         } else {
3087                 /* SSP or NCQ are fully accelerated, no substates */
3088                 return;
3089         }
3090         sci_change_state(sm, state);
3091 }
3092
3093 static void sci_request_completed_state_enter(struct sci_base_state_machine *sm)
3094 {
3095         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3096         struct isci_host *ihost = ireq->owning_controller;
3097
3098         /* Tell the SCI_USER that the IO request is complete */
3099         if (!test_bit(IREQ_TMF, &ireq->flags))
3100                 isci_request_io_request_complete(ihost, ireq,
3101                                                  ireq->sci_status);
3102         else
3103                 isci_task_request_complete(ihost, ireq, ireq->sci_status);
3104 }
3105
3106 static void sci_request_aborting_state_enter(struct sci_base_state_machine *sm)
3107 {
3108         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3109
3110         /* Setting the abort bit in the Task Context is required by the silicon. */
3111         ireq->tc->abort = 1;
3112 }
3113
3114 static void sci_stp_request_started_non_data_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3115 {
3116         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3117
3118         ireq->target_device->working_request = ireq;
3119 }
3120
3121 static void sci_stp_request_started_pio_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3122 {
3123         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3124
3125         ireq->target_device->working_request = ireq;
3126 }
3127
3128 static void sci_stp_request_started_soft_reset_await_h2d_asserted_completion_enter(struct sci_base_state_machine *sm)
3129 {
3130         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3131
3132         ireq->target_device->working_request = ireq;
3133 }
3134
3135 static void sci_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter(struct sci_base_state_machine *sm)
3136 {
3137         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3138         struct scu_task_context *tc = ireq->tc;
3139         struct host_to_dev_fis *h2d_fis;
3140         enum sci_status status;
3141
3142         /* Clear the SRST bit */
3143         h2d_fis = &ireq->stp.cmd;
3144         h2d_fis->control = 0;
3145
3146         /* Clear the TC control bit */
3147         tc->control_frame = 0;
3148
3149         status = sci_controller_continue_io(ireq);
3150         WARN_ONCE(status != SCI_SUCCESS, "isci: continue io failure\n");
3151 }
3152
3153 static const struct sci_base_state sci_request_state_table[] = {
3154         [SCI_REQ_INIT] = { },
3155         [SCI_REQ_CONSTRUCTED] = { },
3156         [SCI_REQ_STARTED] = {
3157                 .enter_state = sci_request_started_state_enter,
3158         },
3159         [SCI_REQ_STP_NON_DATA_WAIT_H2D] = {
3160                 .enter_state = sci_stp_request_started_non_data_await_h2d_completion_enter,
3161         },
3162         [SCI_REQ_STP_NON_DATA_WAIT_D2H] = { },
3163         [SCI_REQ_STP_PIO_WAIT_H2D] = {
3164                 .enter_state = sci_stp_request_started_pio_await_h2d_completion_enter,
3165         },
3166         [SCI_REQ_STP_PIO_WAIT_FRAME] = { },
3167         [SCI_REQ_STP_PIO_DATA_IN] = { },
3168         [SCI_REQ_STP_PIO_DATA_OUT] = { },
3169         [SCI_REQ_STP_UDMA_WAIT_TC_COMP] = { },
3170         [SCI_REQ_STP_UDMA_WAIT_D2H] = { },
3171         [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_ASSERTED] = {
3172                 .enter_state = sci_stp_request_started_soft_reset_await_h2d_asserted_completion_enter,
3173         },
3174         [SCI_REQ_STP_SOFT_RESET_WAIT_H2D_DIAG] = {
3175                 .enter_state = sci_stp_request_started_soft_reset_await_h2d_diagnostic_completion_enter,
3176         },
3177         [SCI_REQ_STP_SOFT_RESET_WAIT_D2H] = { },
3178         [SCI_REQ_TASK_WAIT_TC_COMP] = { },
3179         [SCI_REQ_TASK_WAIT_TC_RESP] = { },
3180         [SCI_REQ_SMP_WAIT_RESP] = { },
3181         [SCI_REQ_SMP_WAIT_TC_COMP] = { },
3182         [SCI_REQ_ATAPI_WAIT_H2D] = { },
3183         [SCI_REQ_ATAPI_WAIT_PIO_SETUP] = { },
3184         [SCI_REQ_ATAPI_WAIT_D2H] = { },
3185         [SCI_REQ_ATAPI_WAIT_TC_COMP] = { },
3186         [SCI_REQ_COMPLETED] = {
3187                 .enter_state = sci_request_completed_state_enter,
3188         },
3189         [SCI_REQ_ABORTING] = {
3190                 .enter_state = sci_request_aborting_state_enter,
3191         },
3192         [SCI_REQ_FINAL] = { },
3193 };
3194
3195 static void
3196 sci_general_request_construct(struct isci_host *ihost,
3197                                    struct isci_remote_device *idev,
3198                                    struct isci_request *ireq)
3199 {
3200         sci_init_sm(&ireq->sm, sci_request_state_table, SCI_REQ_INIT);
3201
3202         ireq->target_device = idev;
3203         ireq->protocol = SCIC_NO_PROTOCOL;
3204         ireq->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
3205
3206         ireq->sci_status   = SCI_SUCCESS;
3207         ireq->scu_status   = 0;
3208         ireq->post_context = 0xFFFFFFFF;
3209 }
3210
3211 static enum sci_status
3212 sci_io_request_construct(struct isci_host *ihost,
3213                           struct isci_remote_device *idev,
3214                           struct isci_request *ireq)
3215 {
3216         struct domain_device *dev = idev->domain_dev;
3217         enum sci_status status = SCI_SUCCESS;
3218
3219         /* Build the common part of the request */
3220         sci_general_request_construct(ihost, idev, ireq);
3221
3222         if (idev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
3223                 return SCI_FAILURE_INVALID_REMOTE_DEVICE;
3224
3225         if (dev->dev_type == SAS_END_DEV)
3226                 /* pass */;
3227         else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP))
3228                 memset(&ireq->stp.cmd, 0, sizeof(ireq->stp.cmd));
3229         else if (dev_is_expander(dev))
3230                 /* pass */;
3231         else
3232                 return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3233
3234         memset(ireq->tc, 0, offsetof(struct scu_task_context, sgl_pair_ab));
3235
3236         return status;
3237 }
3238
3239 enum sci_status sci_task_request_construct(struct isci_host *ihost,
3240                                             struct isci_remote_device *idev,
3241                                             u16 io_tag, struct isci_request *ireq)
3242 {
3243         struct domain_device *dev = idev->domain_dev;
3244         enum sci_status status = SCI_SUCCESS;
3245
3246         /* Build the common part of the request */
3247         sci_general_request_construct(ihost, idev, ireq);
3248
3249         if (dev->dev_type == SAS_END_DEV ||
3250             dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
3251                 set_bit(IREQ_TMF, &ireq->flags);
3252                 memset(ireq->tc, 0, sizeof(struct scu_task_context));
3253         } else
3254                 status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3255
3256         return status;
3257 }
3258
3259 static enum sci_status isci_request_ssp_request_construct(
3260         struct isci_request *request)
3261 {
3262         enum sci_status status;
3263
3264         dev_dbg(&request->isci_host->pdev->dev,
3265                 "%s: request = %p\n",
3266                 __func__,
3267                 request);
3268         status = sci_io_request_construct_basic_ssp(request);
3269         return status;
3270 }
3271
3272 static enum sci_status isci_request_stp_request_construct(struct isci_request *ireq)
3273 {
3274         struct sas_task *task = isci_request_access_task(ireq);
3275         struct host_to_dev_fis *fis = &ireq->stp.cmd;
3276         struct ata_queued_cmd *qc = task->uldd_task;
3277         enum sci_status status;
3278
3279         dev_dbg(&ireq->isci_host->pdev->dev,
3280                 "%s: ireq = %p\n",
3281                 __func__,
3282                 ireq);
3283
3284         memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
3285         if (!task->ata_task.device_control_reg_update)
3286                 fis->flags |= 0x80;
3287         fis->flags &= 0xF0;
3288
3289         status = sci_io_request_construct_basic_sata(ireq);
3290
3291         if (qc && (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
3292                    qc->tf.command == ATA_CMD_FPDMA_READ)) {
3293                 fis->sector_count = qc->tag << 3;
3294                 ireq->tc->type.stp.ncq_tag = qc->tag;
3295         }
3296
3297         return status;
3298 }
3299
3300 static enum sci_status
3301 sci_io_request_construct_smp(struct device *dev,
3302                               struct isci_request *ireq,
3303                               struct sas_task *task)
3304 {
3305         struct scatterlist *sg = &task->smp_task.smp_req;
3306         struct isci_remote_device *idev;
3307         struct scu_task_context *task_context;
3308         struct isci_port *iport;
3309         struct smp_req *smp_req;
3310         void *kaddr;
3311         u8 req_len;
3312         u32 cmd;
3313
3314         kaddr = kmap_atomic(sg_page(sg), KM_IRQ0);
3315         smp_req = kaddr + sg->offset;
3316         /*
3317          * Look at the SMP requests' header fields; for certain SAS 1.x SMP
3318          * functions under SAS 2.0, a zero request length really indicates
3319          * a non-zero default length.
3320          */
3321         if (smp_req->req_len == 0) {
3322                 switch (smp_req->func) {
3323                 case SMP_DISCOVER:
3324                 case SMP_REPORT_PHY_ERR_LOG:
3325                 case SMP_REPORT_PHY_SATA:
3326                 case SMP_REPORT_ROUTE_INFO:
3327                         smp_req->req_len = 2;
3328                         break;
3329                 case SMP_CONF_ROUTE_INFO:
3330                 case SMP_PHY_CONTROL:
3331                 case SMP_PHY_TEST_FUNCTION:
3332                         smp_req->req_len = 9;
3333                         break;
3334                         /* Default - zero is a valid default for 2.0. */
3335                 }
3336         }
3337         req_len = smp_req->req_len;
3338         sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
3339         cmd = *(u32 *) smp_req;
3340         kunmap_atomic(kaddr, KM_IRQ0);
3341
3342         if (!dma_map_sg(dev, sg, 1, DMA_TO_DEVICE))
3343                 return SCI_FAILURE;
3344
3345         ireq->protocol = SCIC_SMP_PROTOCOL;
3346
3347         /* byte swap the smp request. */
3348
3349         task_context = ireq->tc;
3350
3351         idev = ireq->target_device;
3352         iport = idev->owning_port;
3353
3354         /*
3355          * Fill in the TC with the its required data
3356          * 00h
3357          */
3358         task_context->priority = 0;
3359         task_context->initiator_request = 1;
3360         task_context->connection_rate = idev->connection_rate;
3361         task_context->protocol_engine_index = ISCI_PEG;
3362         task_context->logical_port_index = iport->physical_port_index;
3363         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
3364         task_context->abort = 0;
3365         task_context->valid = SCU_TASK_CONTEXT_VALID;
3366         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
3367
3368         /* 04h */
3369         task_context->remote_node_index = idev->rnc.remote_node_index;
3370         task_context->command_code = 0;
3371         task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;
3372
3373         /* 08h */
3374         task_context->link_layer_control = 0;
3375         task_context->do_not_dma_ssp_good_response = 1;
3376         task_context->strict_ordering = 0;
3377         task_context->control_frame = 1;
3378         task_context->timeout_enable = 0;
3379         task_context->block_guard_enable = 0;
3380
3381         /* 0ch */
3382         task_context->address_modifier = 0;
3383
3384         /* 10h */
3385         task_context->ssp_command_iu_length = req_len;
3386
3387         /* 14h */
3388         task_context->transfer_length_bytes = 0;
3389
3390         /*
3391          * 18h ~ 30h, protocol specific
3392          * since commandIU has been build by framework at this point, we just
3393          * copy the frist DWord from command IU to this location. */
3394         memcpy(&task_context->type.smp, &cmd, sizeof(u32));
3395
3396         /*
3397          * 40h
3398          * "For SMP you could program it to zero. We would prefer that way
3399          * so that done code will be consistent." - Venki
3400          */
3401         task_context->task_phase = 0;
3402
3403         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
3404                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
3405                                (iport->physical_port_index <<
3406                                 SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
3407                               ISCI_TAG_TCI(ireq->io_tag));
3408         /*
3409          * Copy the physical address for the command buffer to the SCU Task
3410          * Context command buffer should not contain command header.
3411          */
3412         task_context->command_iu_upper = upper_32_bits(sg_dma_address(sg));
3413         task_context->command_iu_lower = lower_32_bits(sg_dma_address(sg) + sizeof(u32));
3414
3415         /* SMP response comes as UF, so no need to set response IU address. */
3416         task_context->response_iu_upper = 0;
3417         task_context->response_iu_lower = 0;
3418
3419         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
3420
3421         return SCI_SUCCESS;
3422 }
3423
3424 /*
3425  * isci_smp_request_build() - This function builds the smp request.
3426  * @ireq: This parameter points to the isci_request allocated in the
3427  *    request construct function.
3428  *
3429  * SCI_SUCCESS on successfull completion, or specific failure code.
3430  */
3431 static enum sci_status isci_smp_request_build(struct isci_request *ireq)
3432 {
3433         struct sas_task *task = isci_request_access_task(ireq);
3434         struct device *dev = &ireq->isci_host->pdev->dev;
3435         enum sci_status status = SCI_FAILURE;
3436
3437         status = sci_io_request_construct_smp(dev, ireq, task);
3438         if (status != SCI_SUCCESS)
3439                 dev_dbg(&ireq->isci_host->pdev->dev,
3440                          "%s: failed with status = %d\n",
3441                          __func__,
3442                          status);
3443
3444         return status;
3445 }
3446
3447 /**
3448  * isci_io_request_build() - This function builds the io request object.
3449  * @ihost: This parameter specifies the ISCI host object
3450  * @request: This parameter points to the isci_request object allocated in the
3451  *    request construct function.
3452  * @sci_device: This parameter is the handle for the sci core's remote device
3453  *    object that is the destination for this request.
3454  *
3455  * SCI_SUCCESS on successfull completion, or specific failure code.
3456  */
3457 static enum sci_status isci_io_request_build(struct isci_host *ihost,
3458                                              struct isci_request *request,
3459                                              struct isci_remote_device *idev)
3460 {
3461         enum sci_status status = SCI_SUCCESS;
3462         struct sas_task *task = isci_request_access_task(request);
3463
3464         dev_dbg(&ihost->pdev->dev,
3465                 "%s: idev = 0x%p; request = %p, "
3466                 "num_scatter = %d\n",
3467                 __func__,
3468                 idev,
3469                 request,
3470                 task->num_scatter);
3471
3472         /* map the sgl addresses, if present.
3473          * libata does the mapping for sata devices
3474          * before we get the request.
3475          */
3476         if (task->num_scatter &&
3477             !sas_protocol_ata(task->task_proto) &&
3478             !(SAS_PROTOCOL_SMP & task->task_proto)) {
3479
3480                 request->num_sg_entries = dma_map_sg(
3481                         &ihost->pdev->dev,
3482                         task->scatter,
3483                         task->num_scatter,
3484                         task->data_dir
3485                         );
3486
3487                 if (request->num_sg_entries == 0)
3488                         return SCI_FAILURE_INSUFFICIENT_RESOURCES;
3489         }
3490
3491         status = sci_io_request_construct(ihost, idev, request);
3492
3493         if (status != SCI_SUCCESS) {
3494                 dev_dbg(&ihost->pdev->dev,
3495                          "%s: failed request construct\n",
3496                          __func__);
3497                 return SCI_FAILURE;
3498         }
3499
3500         switch (task->task_proto) {
3501         case SAS_PROTOCOL_SMP:
3502                 status = isci_smp_request_build(request);
3503                 break;
3504         case SAS_PROTOCOL_SSP:
3505                 status = isci_request_ssp_request_construct(request);
3506                 break;
3507         case SAS_PROTOCOL_SATA:
3508         case SAS_PROTOCOL_STP:
3509         case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
3510                 status = isci_request_stp_request_construct(request);
3511                 break;
3512         default:
3513                 dev_dbg(&ihost->pdev->dev,
3514                          "%s: unknown protocol\n", __func__);
3515                 return SCI_FAILURE;
3516         }
3517
3518         return SCI_SUCCESS;
3519 }
3520
3521 static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 tag)
3522 {
3523         struct isci_request *ireq;
3524
3525         ireq = ihost->reqs[ISCI_TAG_TCI(tag)];
3526         ireq->io_tag = tag;
3527         ireq->io_request_completion = NULL;
3528         ireq->flags = 0;
3529         ireq->num_sg_entries = 0;
3530         INIT_LIST_HEAD(&ireq->completed_node);
3531         INIT_LIST_HEAD(&ireq->dev_node);
3532         isci_request_change_state(ireq, allocated);
3533
3534         return ireq;
3535 }
3536
3537 static struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
3538                                                      struct sas_task *task,
3539                                                      u16 tag)
3540 {
3541         struct isci_request *ireq;
3542
3543         ireq = isci_request_from_tag(ihost, tag);
3544         ireq->ttype_ptr.io_task_ptr = task;
3545         clear_bit(IREQ_TMF, &ireq->flags);
3546         task->lldd_task = ireq;
3547
3548         return ireq;
3549 }
3550
3551 struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
3552                                                struct isci_tmf *isci_tmf,
3553                                                u16 tag)
3554 {
3555         struct isci_request *ireq;
3556
3557         ireq = isci_request_from_tag(ihost, tag);
3558         ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
3559         set_bit(IREQ_TMF, &ireq->flags);
3560
3561         return ireq;
3562 }
3563
3564 int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
3565                          struct sas_task *task, u16 tag)
3566 {
3567         enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3568         struct isci_request *ireq;
3569         unsigned long flags;
3570         int ret = 0;
3571
3572         /* do common allocation and init of request object. */
3573         ireq = isci_io_request_from_tag(ihost, task, tag);
3574
3575         status = isci_io_request_build(ihost, ireq, idev);
3576         if (status != SCI_SUCCESS) {
3577                 dev_dbg(&ihost->pdev->dev,
3578                          "%s: request_construct failed - status = 0x%x\n",
3579                          __func__,
3580                          status);
3581                 return status;
3582         }
3583
3584         spin_lock_irqsave(&ihost->scic_lock, flags);
3585
3586         if (test_bit(IDEV_IO_NCQERROR, &idev->flags)) {
3587
3588                 if (isci_task_is_ncq_recovery(task)) {
3589
3590                         /* The device is in an NCQ recovery state.  Issue the
3591                          * request on the task side.  Note that it will
3592                          * complete on the I/O request side because the
3593                          * request was built that way (ie.
3594                          * ireq->is_task_management_request is false).
3595                          */
3596                         status = sci_controller_start_task(ihost,
3597                                                             idev,
3598                                                             ireq);
3599                 } else {
3600                         status = SCI_FAILURE;
3601                 }
3602         } else {
3603                 /* send the request, let the core assign the IO TAG.    */
3604                 status = sci_controller_start_io(ihost, idev,
3605                                                   ireq);
3606         }
3607
3608         if (status != SCI_SUCCESS &&
3609             status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3610                 dev_dbg(&ihost->pdev->dev,
3611                          "%s: failed request start (0x%x)\n",
3612                          __func__, status);
3613                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
3614                 return status;
3615         }
3616
3617         /* Either I/O started OK, or the core has signaled that
3618          * the device needs a target reset.
3619          *
3620          * In either case, hold onto the I/O for later.
3621          *
3622          * Update it's status and add it to the list in the
3623          * remote device object.
3624          */
3625         list_add(&ireq->dev_node, &idev->reqs_in_process);
3626
3627         if (status == SCI_SUCCESS) {
3628                 isci_request_change_state(ireq, started);
3629         } else {
3630                 /* The request did not really start in the
3631                  * hardware, so clear the request handle
3632                  * here so no terminations will be done.
3633                  */
3634                 set_bit(IREQ_TERMINATED, &ireq->flags);
3635                 isci_request_change_state(ireq, completed);
3636         }
3637         spin_unlock_irqrestore(&ihost->scic_lock, flags);
3638
3639         if (status ==
3640             SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3641                 /* Signal libsas that we need the SCSI error
3642                  * handler thread to work on this I/O and that
3643                  * we want a device reset.
3644                  */
3645                 spin_lock_irqsave(&task->task_state_lock, flags);
3646                 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
3647                 spin_unlock_irqrestore(&task->task_state_lock, flags);
3648
3649                 /* Cause this task to be scheduled in the SCSI error
3650                  * handler thread.
3651                  */
3652                 isci_execpath_callback(ihost, task,
3653                                        sas_task_abort);
3654
3655                 /* Change the status, since we are holding
3656                  * the I/O until it is managed by the SCSI
3657                  * error handler.
3658                  */
3659                 status = SCI_SUCCESS;
3660         }
3661
3662         return ret;
3663 }