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 <scsi/scsi_cmnd.h>
  57 #include "isci.h"
  58 #include "task.h"
  59 #include "request.h"
  60 #include "scu_completion_codes.h"
  61 #include "scu_event_codes.h"
  62 #include "sas.h"
  63
  64 #undef C
  65 #define C(a) (#a)
  66 const char *req_state_name(enum sci_base_request_states state)
  67 {
  68         static const char * const strings[] = REQUEST_STATES;
  69
  70         return strings[state];
  71 }
  72 #undef C
  73
  74 static struct scu_sgl_element_pair *to_sgl_element_pair(struct isci_request *ireq,
  75                                                         int idx)
  76 {
  77         if (idx == 0)
  78                 return &ireq->tc->sgl_pair_ab;
  79         else if (idx == 1)
  80                 return &ireq->tc->sgl_pair_cd;
  81         else if (idx < 0)
  82                 return NULL;
  83         else
  84                 return &ireq->sg_table[idx - 2];
  85 }
  86
  87 static dma_addr_t to_sgl_element_pair_dma(struct isci_host *ihost,
  88                                           struct isci_request *ireq, u32 idx)
  89 {
  90         u32 offset;
  91
  92         if (idx == 0) {
  93                 offset = (void *) &ireq->tc->sgl_pair_ab -
  94                          (void *) &ihost->task_context_table[0];
  95                 return ihost->tc_dma + offset;
  96         } else if (idx == 1) {
  97                 offset = (void *) &ireq->tc->sgl_pair_cd -
  98                          (void *) &ihost->task_context_table[0];
  99                 return ihost->tc_dma + offset;
 100         }
 101
 102         return sci_io_request_get_dma_addr(ireq, &ireq->sg_table[idx - 2]);
 103 }
 104
 105 static void init_sgl_element(struct scu_sgl_element *e, struct scatterlist *sg)
 106 {
 107         e->length = sg_dma_len(sg);
 108         e->address_upper = upper_32_bits(sg_dma_address(sg));
 109         e->address_lower = lower_32_bits(sg_dma_address(sg));
 110         e->address_modifier = 0;
 111 }
 112
 113 static void sci_request_build_sgl(struct isci_request *ireq)
 114 {
 115         struct isci_host *ihost = ireq->isci_host;
 116         struct sas_task *task = isci_request_access_task(ireq);
 117         struct scatterlist *sg = NULL;
 118         dma_addr_t dma_addr;
 119         u32 sg_idx = 0;
 120         struct scu_sgl_element_pair *scu_sg   = NULL;
 121         struct scu_sgl_element_pair *prev_sg  = NULL;
 122
 123         if (task->num_scatter > 0) {
 124                 sg = task->scatter;
 125
 126                 while (sg) {
 127                         scu_sg = to_sgl_element_pair(ireq, sg_idx);
 128                         init_sgl_element(&scu_sg->A, sg);
 129                         sg = sg_next(sg);
 130                         if (sg) {
 131                                 init_sgl_element(&scu_sg->B, sg);
 132                                 sg = sg_next(sg);
 133                         } else
 134                                 memset(&scu_sg->B, 0, sizeof(scu_sg->B));
 135
 136                         if (prev_sg) {
 137                                 dma_addr = to_sgl_element_pair_dma(ihost,
 138                                                                    ireq,
 139                                                                    sg_idx);
 140
 141                                 prev_sg->next_pair_upper =
 142                                         upper_32_bits(dma_addr);
 143                                 prev_sg->next_pair_lower =
 144                                         lower_32_bits(dma_addr);
 145                         }
 146
 147                         prev_sg = scu_sg;
 148                         sg_idx++;
 149                 }
 150         } else {        /* handle when no sg */
 151                 scu_sg = to_sgl_element_pair(ireq, sg_idx);
 152
 153                 dma_addr = dma_map_single(&ihost->pdev->dev,
 154                                           task->scatter,
 155                                           task->total_xfer_len,
 156                                           task->data_dir);
 157
 158                 ireq->zero_scatter_daddr = dma_addr;
 159
 160                 scu_sg->A.length = task->total_xfer_len;
 161                 scu_sg->A.address_upper = upper_32_bits(dma_addr);
 162                 scu_sg->A.address_lower = lower_32_bits(dma_addr);
 163         }
 164
 165         if (scu_sg) {
 166                 scu_sg->next_pair_upper = 0;
 167                 scu_sg->next_pair_lower = 0;
 168         }
 169 }
 170
 171 static void sci_io_request_build_ssp_command_iu(struct isci_request *ireq)
 172 {
 173         struct ssp_cmd_iu *cmd_iu;
 174         struct sas_task *task = isci_request_access_task(ireq);
 175
 176         cmd_iu = &ireq->ssp.cmd;
 177
 178         memcpy(cmd_iu->LUN, task->ssp_task.LUN, 8);
 179         cmd_iu->add_cdb_len = 0;
 180         cmd_iu->_r_a = 0;
 181         cmd_iu->_r_b = 0;
 182         cmd_iu->en_fburst = 0; /* unsupported */
 183         cmd_iu->task_prio = task->ssp_task.task_prio;
 184         cmd_iu->task_attr = task->ssp_task.task_attr;
 185         cmd_iu->_r_c = 0;
 186
 187         sci_swab32_cpy(&cmd_iu->cdb, task->ssp_task.cdb,
 188                        sizeof(task->ssp_task.cdb) / sizeof(u32));
 189 }
 190
 191 static void sci_task_request_build_ssp_task_iu(struct isci_request *ireq)
 192 {
 193         struct ssp_task_iu *task_iu;
 194         struct sas_task *task = isci_request_access_task(ireq);
 195         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
 196
 197         task_iu = &ireq->ssp.tmf;
 198
 199         memset(task_iu, 0, sizeof(struct ssp_task_iu));
 200
 201         memcpy(task_iu->LUN, task->ssp_task.LUN, 8);
 202
 203         task_iu->task_func = isci_tmf->tmf_code;
 204         task_iu->task_tag =
 205                 (test_bit(IREQ_TMF, &ireq->flags)) ?
 206                 isci_tmf->io_tag :
 207                 SCI_CONTROLLER_INVALID_IO_TAG;
 208 }
 209
 210 /**
 211  * This method is will fill in the SCU Task Context for any type of SSP request.
 212  * @sci_req:
 213  * @task_context:
 214  *
 215  */
 216 static void scu_ssp_reqeust_construct_task_context(
 217         struct isci_request *ireq,
 218         struct scu_task_context *task_context)
 219 {
 220         dma_addr_t dma_addr;
 221         struct isci_remote_device *idev;
 222         struct isci_port *iport;
 223
 224         idev = ireq->target_device;
 225         iport = idev->owning_port;
 226
 227         /* Fill in the TC with the its required data */
 228         task_context->abort = 0;
 229         task_context->priority = 0;
 230         task_context->initiator_request = 1;
 231         task_context->connection_rate = idev->connection_rate;
 232         task_context->protocol_engine_index = ISCI_PEG;
 233         task_context->logical_port_index = iport->physical_port_index;
 234         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SSP;
 235         task_context->valid = SCU_TASK_CONTEXT_VALID;
 236         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
 237
 238         task_context->remote_node_index = idev->rnc.remote_node_index;
 239         task_context->command_code = 0;
 240
 241         task_context->link_layer_control = 0;
 242         task_context->do_not_dma_ssp_good_response = 1;
 243         task_context->strict_ordering = 0;
 244         task_context->control_frame = 0;
 245         task_context->timeout_enable = 0;
 246         task_context->block_guard_enable = 0;
 247
 248         task_context->address_modifier = 0;
 249
 250         /* task_context->type.ssp.tag = ireq->io_tag; */
 251         task_context->task_phase = 0x01;
 252
 253         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 254                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 255                               (iport->physical_port_index <<
 256                                SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
 257                               ISCI_TAG_TCI(ireq->io_tag));
 258
 259         /*
 260          * Copy the physical address for the command buffer to the
 261          * SCU Task Context
 262          */
 263         dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.cmd);
 264
 265         task_context->command_iu_upper = upper_32_bits(dma_addr);
 266         task_context->command_iu_lower = lower_32_bits(dma_addr);
 267
 268         /*
 269          * Copy the physical address for the response buffer to the
 270          * SCU Task Context
 271          */
 272         dma_addr = sci_io_request_get_dma_addr(ireq, &ireq->ssp.rsp);
 273
 274         task_context->response_iu_upper = upper_32_bits(dma_addr);
 275         task_context->response_iu_lower = lower_32_bits(dma_addr);
 276 }
 277
 278 static u8 scu_bg_blk_size(struct scsi_device *sdp)
 279 {
 280         switch (sdp->sector_size) {
 281         case 512:
 282                 return 0;
 283         case 1024:
 284                 return 1;
 285         case 4096:
 286                 return 3;
 287         default:
 288                 return 0xff;
 289         }
 290 }
 291
 292 static u32 scu_dif_bytes(u32 len, u32 sector_size)
 293 {
 294         return (len >> ilog2(sector_size)) * 8;
 295 }
 296
 297 static void scu_ssp_ireq_dif_insert(struct isci_request *ireq, u8 type, u8 op)
 298 {
 299         struct scu_task_context *tc = ireq->tc;
 300         struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
 301         u8 blk_sz = scu_bg_blk_size(scmd->device);
 302
 303         tc->block_guard_enable = 1;
 304         tc->blk_prot_en = 1;
 305         tc->blk_sz = blk_sz;
 306         /* DIF write insert */
 307         tc->blk_prot_func = 0x2;
 308
 309         tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
 310                                                    scmd->device->sector_size);
 311
 312         /* always init to 0, used by hw */
 313         tc->interm_crc_val = 0;
 314
 315         tc->init_crc_seed = 0;
 316         tc->app_tag_verify = 0;
 317         tc->app_tag_gen = 0;
 318         tc->ref_tag_seed_verify = 0;
 319
 320         /* always init to same as bg_blk_sz */
 321         tc->UD_bytes_immed_val = scmd->device->sector_size;
 322
 323         tc->reserved_DC_0 = 0;
 324
 325         /* always init to 8 */
 326         tc->DIF_bytes_immed_val = 8;
 327
 328         tc->reserved_DC_1 = 0;
 329         tc->bgc_blk_sz = scmd->device->sector_size;
 330         tc->reserved_E0_0 = 0;
 331         tc->app_tag_gen_mask = 0;
 332
 333         /** setup block guard control **/
 334         tc->bgctl = 0;
 335
 336         /* DIF write insert */
 337         tc->bgctl_f.op = 0x2;
 338
 339         tc->app_tag_verify_mask = 0;
 340
 341         /* must init to 0 for hw */
 342         tc->blk_guard_err = 0;
 343
 344         tc->reserved_E8_0 = 0;
 345
 346         if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
 347                 tc->ref_tag_seed_gen = scsi_get_lba(scmd) & 0xffffffff;
 348         else if (type & SCSI_PROT_DIF_TYPE3)
 349                 tc->ref_tag_seed_gen = 0;
 350 }
 351
 352 static void scu_ssp_ireq_dif_strip(struct isci_request *ireq, u8 type, u8 op)
 353 {
 354         struct scu_task_context *tc = ireq->tc;
 355         struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
 356         u8 blk_sz = scu_bg_blk_size(scmd->device);
 357
 358         tc->block_guard_enable = 1;
 359         tc->blk_prot_en = 1;
 360         tc->blk_sz = blk_sz;
 361         /* DIF read strip */
 362         tc->blk_prot_func = 0x1;
 363
 364         tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
 365                                                    scmd->device->sector_size);
 366
 367         /* always init to 0, used by hw */
 368         tc->interm_crc_val = 0;
 369
 370         tc->init_crc_seed = 0;
 371         tc->app_tag_verify = 0;
 372         tc->app_tag_gen = 0;
 373
 374         if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
 375                 tc->ref_tag_seed_verify = scsi_get_lba(scmd) & 0xffffffff;
 376         else if (type & SCSI_PROT_DIF_TYPE3)
 377                 tc->ref_tag_seed_verify = 0;
 378
 379         /* always init to same as bg_blk_sz */
 380         tc->UD_bytes_immed_val = scmd->device->sector_size;
 381
 382         tc->reserved_DC_0 = 0;
 383
 384         /* always init to 8 */
 385         tc->DIF_bytes_immed_val = 8;
 386
 387         tc->reserved_DC_1 = 0;
 388         tc->bgc_blk_sz = scmd->device->sector_size;
 389         tc->reserved_E0_0 = 0;
 390         tc->app_tag_gen_mask = 0;
 391
 392         /** setup block guard control **/
 393         tc->bgctl = 0;
 394
 395         /* DIF read strip */
 396         tc->bgctl_f.crc_verify = 1;
 397         tc->bgctl_f.op = 0x1;
 398         if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2)) {
 399                 tc->bgctl_f.ref_tag_chk = 1;
 400                 tc->bgctl_f.app_f_detect = 1;
 401         } else if (type & SCSI_PROT_DIF_TYPE3)
 402                 tc->bgctl_f.app_ref_f_detect = 1;
 403
 404         tc->app_tag_verify_mask = 0;
 405
 406         /* must init to 0 for hw */
 407         tc->blk_guard_err = 0;
 408
 409         tc->reserved_E8_0 = 0;
 410         tc->ref_tag_seed_gen = 0;
 411 }
 412
 413 /**
 414  * This method is will fill in the SCU Task Context for a SSP IO request.
 415  * @sci_req:
 416  *
 417  */
 418 static void scu_ssp_io_request_construct_task_context(struct isci_request *ireq,
 419                                                       enum dma_data_direction dir,
 420                                                       u32 len)
 421 {
 422         struct scu_task_context *task_context = ireq->tc;
 423         struct sas_task *sas_task = ireq->ttype_ptr.io_task_ptr;
 424         struct scsi_cmnd *scmd = sas_task->uldd_task;
 425         u8 prot_type = scsi_get_prot_type(scmd);
 426         u8 prot_op = scsi_get_prot_op(scmd);
 427
 428         scu_ssp_reqeust_construct_task_context(ireq, task_context);
 429
 430         task_context->ssp_command_iu_length =
 431                 sizeof(struct ssp_cmd_iu) / sizeof(u32);
 432         task_context->type.ssp.frame_type = SSP_COMMAND;
 433
 434         switch (dir) {
 435         case DMA_FROM_DEVICE:
 436         case DMA_NONE:
 437         default:
 438                 task_context->task_type = SCU_TASK_TYPE_IOREAD;
 439                 break;
 440         case DMA_TO_DEVICE:
 441                 task_context->task_type = SCU_TASK_TYPE_IOWRITE;
 442                 break;
 443         }
 444
 445         task_context->transfer_length_bytes = len;
 446
 447         if (task_context->transfer_length_bytes > 0)
 448                 sci_request_build_sgl(ireq);
 449
 450         if (prot_type != SCSI_PROT_DIF_TYPE0) {
 451                 if (prot_op == SCSI_PROT_READ_STRIP)
 452                         scu_ssp_ireq_dif_strip(ireq, prot_type, prot_op);
 453                 else if (prot_op == SCSI_PROT_WRITE_INSERT)
 454                         scu_ssp_ireq_dif_insert(ireq, prot_type, prot_op);
 455         }
 456 }
 457
 458 /**
 459  * This method will fill in the SCU Task Context for a SSP Task request.  The
 460  *    following important settings are utilized: -# priority ==
 461  *    SCU_TASK_PRIORITY_HIGH.  This ensures that the task request is issued
 462  *    ahead of other task destined for the same Remote Node. -# task_type ==
 463  *    SCU_TASK_TYPE_IOREAD.  This simply indicates that a normal request type
 464  *    (i.e. non-raw frame) is being utilized to perform task management. -#
 465  *    control_frame == 1.  This ensures that the proper endianess is set so
 466  *    that the bytes are transmitted in the right order for a task frame.
 467  * @sci_req: This parameter specifies the task request object being
 468  *    constructed.
 469  *
 470  */
 471 static void scu_ssp_task_request_construct_task_context(struct isci_request *ireq)
 472 {
 473         struct scu_task_context *task_context = ireq->tc;
 474
 475         scu_ssp_reqeust_construct_task_context(ireq, task_context);
 476
 477         task_context->control_frame                = 1;
 478         task_context->priority                     = SCU_TASK_PRIORITY_HIGH;
 479         task_context->task_type                    = SCU_TASK_TYPE_RAW_FRAME;
 480         task_context->transfer_length_bytes        = 0;
 481         task_context->type.ssp.frame_type          = SSP_TASK;
 482         task_context->ssp_command_iu_length =
 483                 sizeof(struct ssp_task_iu) / sizeof(u32);
 484 }
 485
 486 /**
 487  * This method is will fill in the SCU Task Context for any type of SATA
 488  *    request.  This is called from the various SATA constructors.
 489  * @sci_req: The general IO request object which is to be used in
 490  *    constructing the SCU task context.
 491  * @task_context: The buffer pointer for the SCU task context which is being
 492  *    constructed.
 493  *
 494  * The general io request construction is complete. The buffer assignment for
 495  * the command buffer is complete. none Revisit task context construction to
 496  * determine what is common for SSP/SMP/STP task context structures.
 497  */
 498 static void scu_sata_reqeust_construct_task_context(
 499         struct isci_request *ireq,
 500         struct scu_task_context *task_context)
 501 {
 502         dma_addr_t dma_addr;
 503         struct isci_remote_device *idev;
 504         struct isci_port *iport;
 505
 506         idev = ireq->target_device;
 507         iport = idev->owning_port;
 508
 509         /* Fill in the TC with the its required data */
 510         task_context->abort = 0;
 511         task_context->priority = SCU_TASK_PRIORITY_NORMAL;
 512         task_context->initiator_request = 1;
 513         task_context->connection_rate = idev->connection_rate;
 514         task_context->protocol_engine_index = ISCI_PEG;
 515         task_context->logical_port_index = iport->physical_port_index;
 516         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_STP;
 517         task_context->valid = SCU_TASK_CONTEXT_VALID;
 518         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
 519
 520         task_context->remote_node_index = idev->rnc.remote_node_index;
 521         task_context->command_code = 0;
 522
 523         task_context->link_layer_control = 0;
 524         task_context->do_not_dma_ssp_good_response = 1;
 525         task_context->strict_ordering = 0;
 526         task_context->control_frame = 0;
 527         task_context->timeout_enable = 0;
 528         task_context->block_guard_enable = 0;
 529
 530         task_context->address_modifier = 0;
 531         task_context->task_phase = 0x01;
 532
 533         task_context->ssp_command_iu_length =
 534                 (sizeof(struct host_to_dev_fis) - sizeof(u32)) / sizeof(u32);
 535
 536         /* Set the first word of the H2D REG FIS */
 537         task_context->type.words[0] = *(u32 *)&ireq->stp.cmd;
 538
 539         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 540                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 541                               (iport->physical_port_index <<
 542                                SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
 543                               ISCI_TAG_TCI(ireq->io_tag));
 544         /*
 545          * Copy the physical address for the command buffer to the SCU Task
 546          * Context. We must offset the command buffer by 4 bytes because the
 547          * first 4 bytes are transfered in the body of the TC.
 548          */
 549         dma_addr = sci_io_request_get_dma_addr(ireq,
 550                                                 ((char *) &ireq->stp.cmd) +
 551                                                 sizeof(u32));
 552
 553         task_context->command_iu_upper = upper_32_bits(dma_addr);
 554         task_context->command_iu_lower = lower_32_bits(dma_addr);
 555
 556         /* SATA Requests do not have a response buffer */
 557         task_context->response_iu_upper = 0;
 558         task_context->response_iu_lower = 0;
 559 }
 560
 561 static void scu_stp_raw_request_construct_task_context(struct isci_request *ireq)
 562 {
 563         struct scu_task_context *task_context = ireq->tc;
 564
 565         scu_sata_reqeust_construct_task_context(ireq, task_context);
 566
 567         task_context->control_frame         = 0;
 568         task_context->priority              = SCU_TASK_PRIORITY_NORMAL;
 569         task_context->task_type             = SCU_TASK_TYPE_SATA_RAW_FRAME;
 570         task_context->type.stp.fis_type     = FIS_REGH2D;
 571         task_context->transfer_length_bytes = sizeof(struct host_to_dev_fis) - sizeof(u32);
 572 }
 573
 574 static enum sci_status sci_stp_pio_request_construct(struct isci_request *ireq,
 575                                                           bool copy_rx_frame)
 576 {
 577         struct isci_stp_request *stp_req = &ireq->stp.req;
 578
 579         scu_stp_raw_request_construct_task_context(ireq);
 580
 581         stp_req->status = 0;
 582         stp_req->sgl.offset = 0;
 583         stp_req->sgl.set = SCU_SGL_ELEMENT_PAIR_A;
 584
 585         if (copy_rx_frame) {
 586                 sci_request_build_sgl(ireq);
 587                 stp_req->sgl.index = 0;
 588         } else {
 589                 /* The user does not want the data copied to the SGL buffer location */
 590                 stp_req->sgl.index = -1;
 591         }
 592
 593         return SCI_SUCCESS;
 594 }
 595
 596 /**
 597  *
 598  * @sci_req: This parameter specifies the request to be constructed as an
 599  *    optimized request.
 600  * @optimized_task_type: This parameter specifies whether the request is to be
 601  *    an UDMA request or a NCQ request. - A value of 0 indicates UDMA. - A
 602  *    value of 1 indicates NCQ.
 603  *
 604  * This method will perform request construction common to all types of STP
 605  * requests that are optimized by the silicon (i.e. UDMA, NCQ). This method
 606  * returns an indication as to whether the construction was successful.
 607  */
 608 static void sci_stp_optimized_request_construct(struct isci_request *ireq,
 609                                                      u8 optimized_task_type,
 610                                                      u32 len,
 611                                                      enum dma_data_direction dir)
 612 {
 613         struct scu_task_context *task_context = ireq->tc;
 614
 615         /* Build the STP task context structure */
 616         scu_sata_reqeust_construct_task_context(ireq, task_context);
 617
 618         /* Copy over the SGL elements */
 619         sci_request_build_sgl(ireq);
 620
 621         /* Copy over the number of bytes to be transfered */
 622         task_context->transfer_length_bytes = len;
 623
 624         if (dir == DMA_TO_DEVICE) {
 625                 /*
 626                  * The difference between the DMA IN and DMA OUT request task type
 627                  * values are consistent with the difference between FPDMA READ
 628                  * and FPDMA WRITE values.  Add the supplied task type parameter
 629                  * to this difference to set the task type properly for this
 630                  * DATA OUT (WRITE) case. */
 631                 task_context->task_type = optimized_task_type + (SCU_TASK_TYPE_DMA_OUT
 632                                                                  - SCU_TASK_TYPE_DMA_IN);
 633         } else {
 634                 /*
 635                  * For the DATA IN (READ) case, simply save the supplied
 636                  * optimized task type. */
 637                 task_context->task_type = optimized_task_type;
 638         }
 639 }
 640
 641 static void sci_atapi_construct(struct isci_request *ireq)
 642 {
 643         struct host_to_dev_fis *h2d_fis = &ireq->stp.cmd;
 644         struct sas_task *task;
 645
 646         /* To simplify the implementation we take advantage of the
 647          * silicon's partial acceleration of atapi protocol (dma data
 648          * transfers), so we promote all commands to dma protocol.  This
 649          * breaks compatibility with ATA_HORKAGE_ATAPI_MOD16_DMA drives.
 650          */
 651         h2d_fis->features |= ATAPI_PKT_DMA;
 652
 653         scu_stp_raw_request_construct_task_context(ireq);
 654
 655         task = isci_request_access_task(ireq);
 656         if (task->data_dir == DMA_NONE)
 657                 task->total_xfer_len = 0;
 658
 659         /* clear the response so we can detect arrivial of an
 660          * unsolicited h2d fis
 661          */
 662         ireq->stp.rsp.fis_type = 0;
 663 }
 664
 665 static enum sci_status
 666 sci_io_request_construct_sata(struct isci_request *ireq,
 667                                u32 len,
 668                                enum dma_data_direction dir,
 669                                bool copy)
 670 {
 671         enum sci_status status = SCI_SUCCESS;
 672         struct sas_task *task = isci_request_access_task(ireq);
 673         struct domain_device *dev = ireq->target_device->domain_dev;
 674
 675         /* check for management protocols */
 676         if (test_bit(IREQ_TMF, &ireq->flags)) {
 677                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 678
 679                 dev_err(&ireq->owning_controller->pdev->dev,
 680                         "%s: Request 0x%p received un-handled SAT "
 681                         "management protocol 0x%x.\n",
 682                         __func__, ireq, tmf->tmf_code);
 683
 684                 return SCI_FAILURE;
 685         }
 686
 687         if (!sas_protocol_ata(task->task_proto)) {
 688                 dev_err(&ireq->owning_controller->pdev->dev,
 689                         "%s: Non-ATA protocol in SATA path: 0x%x\n",
 690                         __func__,
 691                         task->task_proto);
 692                 return SCI_FAILURE;
 693
 694         }
 695
 696         /* ATAPI */
 697         if (dev->sata_dev.command_set == ATAPI_COMMAND_SET &&
 698             task->ata_task.fis.command == ATA_CMD_PACKET) {
 699                 sci_atapi_construct(ireq);
 700                 return SCI_SUCCESS;
 701         }
 702
 703         /* non data */
 704         if (task->data_dir == DMA_NONE) {
 705                 scu_stp_raw_request_construct_task_context(ireq);
 706                 return SCI_SUCCESS;
 707         }
 708
 709         /* NCQ */
 710         if (task->ata_task.use_ncq) {
 711                 sci_stp_optimized_request_construct(ireq,
 712                                                          SCU_TASK_TYPE_FPDMAQ_READ,
 713                                                          len, dir);
 714                 return SCI_SUCCESS;
 715         }
 716
 717         /* DMA */
 718         if (task->ata_task.dma_xfer) {
 719                 sci_stp_optimized_request_construct(ireq,
 720                                                          SCU_TASK_TYPE_DMA_IN,
 721                                                          len, dir);
 722                 return SCI_SUCCESS;
 723         } else /* PIO */
 724                 return sci_stp_pio_request_construct(ireq, copy);
 725
 726         return status;
 727 }
 728
 729 static enum sci_status sci_io_request_construct_basic_ssp(struct isci_request *ireq)
 730 {
 731         struct sas_task *task = isci_request_access_task(ireq);
 732
 733         ireq->protocol = SAS_PROTOCOL_SSP;
 734
 735         scu_ssp_io_request_construct_task_context(ireq,
 736                                                   task->data_dir,
 737                                                   task->total_xfer_len);
 738
 739         sci_io_request_build_ssp_command_iu(ireq);
 740
 741         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 742
 743         return SCI_SUCCESS;
 744 }
 745
 746 enum sci_status sci_task_request_construct_ssp(
 747         struct isci_request *ireq)
 748 {
 749         /* Construct the SSP Task SCU Task Context */
 750         scu_ssp_task_request_construct_task_context(ireq);
 751
 752         /* Fill in the SSP Task IU */
 753         sci_task_request_build_ssp_task_iu(ireq);
 754
 755         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 756
 757         return SCI_SUCCESS;
 758 }
 759
 760 static enum sci_status sci_io_request_construct_basic_sata(struct isci_request *ireq)
 761 {
 762         enum sci_status status;
 763         bool copy = false;
 764         struct sas_task *task = isci_request_access_task(ireq);
 765
 766         ireq->protocol = SAS_PROTOCOL_STP;
 767
 768         copy = (task->data_dir == DMA_NONE) ? false : true;
 769
 770         status = sci_io_request_construct_sata(ireq,
 771                                                 task->total_xfer_len,
 772                                                 task->data_dir,
 773                                                 copy);
 774
 775         if (status == SCI_SUCCESS)
 776                 sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
 777
 778         return status;
 779 }
 780
 781 /**
 782  * sci_req_tx_bytes - bytes transferred when reply underruns request
 783  * @ireq: request that was terminated early
 784  */
 785 #define SCU_TASK_CONTEXT_SRAM 0x200000
 786 static u32 sci_req_tx_bytes(struct isci_request *ireq)
 787 {
 788         struct isci_host *ihost = ireq->owning_controller;
 789         u32 ret_val = 0;
 790
 791         if (readl(&ihost->smu_registers->address_modifier) == 0) {
 792                 void __iomem *scu_reg_base = ihost->scu_registers;
 793
 794                 /* get the bytes of data from the Address == BAR1 + 20002Ch + (256*TCi) where
 795                  *   BAR1 is the scu_registers
 796                  *   0x20002C = 0x200000 + 0x2c
 797                  *            = start of task context SRAM + offset of (type.ssp.data_offset)
 798                  *   TCi is the io_tag of struct sci_request
 799                  */
 800                 ret_val = readl(scu_reg_base +
 801                                 (SCU_TASK_CONTEXT_SRAM + offsetof(struct scu_task_context, type.ssp.data_offset)) +
 802                                 ((sizeof(struct scu_task_context)) * ISCI_TAG_TCI(ireq->io_tag)));
 803         }
 804
 805         return ret_val;
 806 }
 807
 808 enum sci_status sci_request_start(struct isci_request *ireq)
 809 {
 810         enum sci_base_request_states state;
 811         struct scu_task_context *tc = ireq->tc;
 812         struct isci_host *ihost = ireq->owning_controller;
 813
 814         state = ireq->sm.current_state_id;
 815         if (state != SCI_REQ_CONSTRUCTED) {
 816                 dev_warn(&ihost->pdev->dev,
 817                         "%s: SCIC IO Request requested to start while in wrong "
 818                          "state %d\n", __func__, state);
 819                 return SCI_FAILURE_INVALID_STATE;
 820         }
 821
 822         tc->task_index = ISCI_TAG_TCI(ireq->io_tag);
 823
 824         switch (tc->protocol_type) {
 825         case SCU_TASK_CONTEXT_PROTOCOL_SMP:
 826         case SCU_TASK_CONTEXT_PROTOCOL_SSP:
 827                 /* SSP/SMP Frame */
 828                 tc->type.ssp.tag = ireq->io_tag;
 829                 tc->type.ssp.target_port_transfer_tag = 0xFFFF;
 830                 break;
 831
 832         case SCU_TASK_CONTEXT_PROTOCOL_STP:
 833                 /* STP/SATA Frame
 834                  * tc->type.stp.ncq_tag = ireq->ncq_tag;
 835                  */
 836                 break;
 837
 838         case SCU_TASK_CONTEXT_PROTOCOL_NONE:
 839                 /* / @todo When do we set no protocol type? */
 840                 break;
 841
 842         default:
 843                 /* This should never happen since we build the IO
 844                  * requests */
 845                 break;
 846         }
 847
 848         /* Add to the post_context the io tag value */
 849         ireq->post_context |= ISCI_TAG_TCI(ireq->io_tag);
 850
 851         /* Everything is good go ahead and change state */
 852         sci_change_state(&ireq->sm, SCI_REQ_STARTED);
 853
 854         return SCI_SUCCESS;
 855 }
 856
 857 enum sci_status
 858 sci_io_request_terminate(struct isci_request *ireq)
 859 {
 860         enum sci_base_request_states state;
 861
 862         state = ireq->sm.current_state_id;
 863
 864         switch (state) {
 865         case SCI_REQ_CONSTRUCTED:
 866                 /* Set to make sure no HW terminate posting is done: */
 867                 set_bit(IREQ_TC_ABORT_POSTED, &ireq->flags);
 868                 ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
 869                 ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
 870                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
 871                 return SCI_SUCCESS;
 872         case SCI_REQ_STARTED:
 873         case SCI_REQ_TASK_WAIT_TC_COMP:
 874         case SCI_REQ_SMP_WAIT_RESP:
 875         case SCI_REQ_SMP_WAIT_TC_COMP:
 876         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
 877         case SCI_REQ_STP_UDMA_WAIT_D2H:
 878         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
 879         case SCI_REQ_STP_NON_DATA_WAIT_D2H:
 880         case SCI_REQ_STP_PIO_WAIT_H2D:
 881         case SCI_REQ_STP_PIO_WAIT_FRAME:
 882         case SCI_REQ_STP_PIO_DATA_IN:
 883         case SCI_REQ_STP_PIO_DATA_OUT:
 884         case SCI_REQ_ATAPI_WAIT_H2D:
 885         case SCI_REQ_ATAPI_WAIT_PIO_SETUP:
 886         case SCI_REQ_ATAPI_WAIT_D2H:
 887         case SCI_REQ_ATAPI_WAIT_TC_COMP:
 888                 /* Fall through and change state to ABORTING... */
 889         case SCI_REQ_TASK_WAIT_TC_RESP:
 890                 /* The task frame was already confirmed to have been
 891                  * sent by the SCU HW.  Since the state machine is
 892                  * now only waiting for the task response itself,
 893                  * abort the request and complete it immediately
 894                  * and don't wait for the task response.
 895                  */
 896                 sci_change_state(&ireq->sm, SCI_REQ_ABORTING);
 897                 /* Fall through and handle like ABORTING... */
 898         case SCI_REQ_ABORTING:
 899                 if (!isci_remote_device_is_safe_to_abort(ireq->target_device))
 900                         set_bit(IREQ_PENDING_ABORT, &ireq->flags);
 901                 else
 902                         clear_bit(IREQ_PENDING_ABORT, &ireq->flags);
 903                 /* If the request is only waiting on the remote device
 904                  * suspension, return SUCCESS so the caller will wait too.
 905                  */
 906                 return SCI_SUCCESS;
 907         case SCI_REQ_COMPLETED:
 908         default:
 909                 dev_warn(&ireq->owning_controller->pdev->dev,
 910                          "%s: SCIC IO Request requested to abort while in wrong "
 911                          "state %d\n", __func__, ireq->sm.current_state_id);
 912                 break;
 913         }
 914
 915         return SCI_FAILURE_INVALID_STATE;
 916 }
 917
 918 enum sci_status sci_request_complete(struct isci_request *ireq)
 919 {
 920         enum sci_base_request_states state;
 921         struct isci_host *ihost = ireq->owning_controller;
 922
 923         state = ireq->sm.current_state_id;
 924         if (WARN_ONCE(state != SCI_REQ_COMPLETED,
 925                       "isci: request completion from wrong state (%s)\n",
 926                       req_state_name(state)))
 927                 return SCI_FAILURE_INVALID_STATE;
 928
 929         if (ireq->saved_rx_frame_index != SCU_INVALID_FRAME_INDEX)
 930                 sci_controller_release_frame(ihost,
 931                                                   ireq->saved_rx_frame_index);
 932
 933         /* XXX can we just stop the machine and remove the 'final' state? */
 934         sci_change_state(&ireq->sm, SCI_REQ_FINAL);
 935         return SCI_SUCCESS;
 936 }
 937
 938 enum sci_status sci_io_request_event_handler(struct isci_request *ireq,
 939                                                   u32 event_code)
 940 {
 941         enum sci_base_request_states state;
 942         struct isci_host *ihost = ireq->owning_controller;
 943
 944         state = ireq->sm.current_state_id;
 945
 946         if (state != SCI_REQ_STP_PIO_DATA_IN) {
 947                 dev_warn(&ihost->pdev->dev, "%s: (%x) in wrong state %s\n",
 948                          __func__, event_code, req_state_name(state));
 949
 950                 return SCI_FAILURE_INVALID_STATE;
 951         }
 952
 953         switch (scu_get_event_specifier(event_code)) {
 954         case SCU_TASK_DONE_CRC_ERR << SCU_EVENT_SPECIFIC_CODE_SHIFT:
 955                 /* We are waiting for data and the SCU has R_ERR the data frame.
 956                  * Go back to waiting for the D2H Register FIS
 957                  */
 958                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
 959                 return SCI_SUCCESS;
 960         default:
 961                 dev_err(&ihost->pdev->dev,
 962                         "%s: pio request unexpected event %#x\n",
 963                         __func__, event_code);
 964
 965                 /* TODO Should we fail the PIO request when we get an
 966                  * unexpected event?
 967                  */
 968                 return SCI_FAILURE;
 969         }
 970 }
 971
 972 /*
 973  * This function copies response data for requests returning response data
 974  *    instead of sense data.
 975  * @sci_req: This parameter specifies the request object for which to copy
 976  *    the response data.
 977  */
 978 static void sci_io_request_copy_response(struct isci_request *ireq)
 979 {
 980         void *resp_buf;
 981         u32 len;
 982         struct ssp_response_iu *ssp_response;
 983         struct isci_tmf *isci_tmf = isci_request_access_tmf(ireq);
 984
 985         ssp_response = &ireq->ssp.rsp;
 986
 987         resp_buf = &isci_tmf->resp.resp_iu;
 988
 989         len = min_t(u32,
 990                     SSP_RESP_IU_MAX_SIZE,
 991                     be32_to_cpu(ssp_response->response_data_len));
 992
 993         memcpy(resp_buf, ssp_response->resp_data, len);
 994 }
 995
 996 static enum sci_status
 997 request_started_state_tc_event(struct isci_request *ireq,
 998                                u32 completion_code)
 999 {
1000         struct ssp_response_iu *resp_iu;
1001         u8 datapres;
1002
1003         /* TODO: Any SDMA return code of other than 0 is bad decode 0x003C0000
1004          * to determine SDMA status
1005          */
1006         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1007         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1008                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1009                 ireq->sci_status = SCI_SUCCESS;
1010                 break;
1011         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EARLY_RESP): {
1012                 /* There are times when the SCU hardware will return an early
1013                  * response because the io request specified more data than is
1014                  * returned by the target device (mode pages, inquiry data,
1015                  * etc.).  We must check the response stats to see if this is
1016                  * truly a failed request or a good request that just got
1017                  * completed early.
1018                  */
1019                 struct ssp_response_iu *resp = &ireq->ssp.rsp;
1020                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1021
1022                 sci_swab32_cpy(&ireq->ssp.rsp,
1023                                &ireq->ssp.rsp,
1024                                word_cnt);
1025
1026                 if (resp->status == 0) {
1027                         ireq->scu_status = SCU_TASK_DONE_GOOD;
1028                         ireq->sci_status = SCI_SUCCESS_IO_DONE_EARLY;
1029                 } else {
1030                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1031                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1032                 }
1033                 break;
1034         }
1035         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_CHECK_RESPONSE): {
1036                 ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1037
1038                 sci_swab32_cpy(&ireq->ssp.rsp,
1039                                &ireq->ssp.rsp,
1040                                word_cnt);
1041
1042                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1043                 ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1044                 break;
1045         }
1046
1047         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RESP_LEN_ERR):
1048                 /* TODO With TASK_DONE_RESP_LEN_ERR is the response frame
1049                  * guaranteed to be received before this completion status is
1050                  * posted?
1051                  */
1052                 resp_iu = &ireq->ssp.rsp;
1053                 datapres = resp_iu->datapres;
1054
1055                 if (datapres == 1 || datapres == 2) {
1056                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1057                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1058                 } else {
1059                         ireq->scu_status = SCU_TASK_DONE_GOOD;
1060                         ireq->sci_status = SCI_SUCCESS;
1061                 }
1062                 break;
1063         /* only stp device gets suspended. */
1064         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
1065         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_PERR):
1066         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_ERR):
1067         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_DATA_LEN_ERR):
1068         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LL_ABORT_ERR):
1069         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_WD_LEN):
1070         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_MAX_PLD_ERR):
1071         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_RESP):
1072         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_SDBFIS):
1073         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
1074         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDB_ERR):
1075                 if (ireq->protocol == SAS_PROTOCOL_STP) {
1076                         ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1077                                            SCU_COMPLETION_TL_STATUS_SHIFT;
1078                         ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
1079                 } else {
1080                         ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1081                                            SCU_COMPLETION_TL_STATUS_SHIFT;
1082                         ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1083                 }
1084                 break;
1085
1086         /* both stp/ssp device gets suspended */
1087         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_LF_ERR):
1088         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_WRONG_DESTINATION):
1089         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1):
1090         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2):
1091         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3):
1092         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_BAD_DESTINATION):
1093         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_ZONE_VIOLATION):
1094         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY):
1095         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED):
1096         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED):
1097                 ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1098                                    SCU_COMPLETION_TL_STATUS_SHIFT;
1099                 ireq->sci_status = SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
1100                 break;
1101
1102         /* neither ssp nor stp gets suspended. */
1103         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_NAK_CMD_ERR):
1104         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_XR):
1105         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_XR_IU_LEN_ERR):
1106         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SDMA_ERR):
1107         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OFFSET_ERR):
1108         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_EXCESS_DATA):
1109         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
1110         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
1111         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
1112         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
1113         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_DATA):
1114         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_OPEN_FAIL):
1115         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_VIIT_ENTRY_NV):
1116         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_IIT_ENTRY_NV):
1117         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_RNCNV_OUTBOUND):
1118         default:
1119                 ireq->scu_status = SCU_GET_COMPLETION_TL_STATUS(completion_code) >>
1120                                    SCU_COMPLETION_TL_STATUS_SHIFT;
1121                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1122                 break;
1123         }
1124
1125         /*
1126          * TODO: This is probably wrong for ACK/NAK timeout conditions
1127          */
1128
1129         /* In all cases we will treat this as the completion of the IO req. */
1130         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1131         return SCI_SUCCESS;
1132 }
1133
1134 static enum sci_status
1135 request_aborting_state_tc_event(struct isci_request *ireq,
1136                                 u32 completion_code)
1137 {
1138         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1139         case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
1140         case (SCU_TASK_DONE_TASK_ABORT << SCU_COMPLETION_TL_STATUS_SHIFT):
1141                 ireq->scu_status = SCU_TASK_DONE_TASK_ABORT;
1142                 ireq->sci_status = SCI_FAILURE_IO_TERMINATED;
1143                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1144                 break;
1145
1146         default:
1147                 /* Unless we get some strange error wait for the task abort to complete
1148                  * TODO: Should there be a state change for this completion?
1149                  */
1150                 break;
1151         }
1152
1153         return SCI_SUCCESS;
1154 }
1155
1156 static enum sci_status ssp_task_request_await_tc_event(struct isci_request *ireq,
1157                                                        u32 completion_code)
1158 {
1159         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1160         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1161                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1162                 ireq->sci_status = SCI_SUCCESS;
1163                 sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1164                 break;
1165         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
1166                 /* Currently, the decision is to simply allow the task request
1167                  * to timeout if the task IU wasn't received successfully.
1168                  * There is a potential for receiving multiple task responses if
1169                  * we decide to send the task IU again.
1170                  */
1171                 dev_warn(&ireq->owning_controller->pdev->dev,
1172                          "%s: TaskRequest:0x%p CompletionCode:%x - "
1173                          "ACK/NAK timeout\n", __func__, ireq,
1174                          completion_code);
1175
1176                 sci_change_state(&ireq->sm, SCI_REQ_TASK_WAIT_TC_RESP);
1177                 break;
1178         default:
1179                 /*
1180                  * All other completion status cause the IO to be complete.
1181                  * If a NAK was received, then it is up to the user to retry
1182                  * the request.
1183                  */
1184                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1185                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1186                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1187                 break;
1188         }
1189
1190         return SCI_SUCCESS;
1191 }
1192
1193 static enum sci_status
1194 smp_request_await_response_tc_event(struct isci_request *ireq,
1195                                     u32 completion_code)
1196 {
1197         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1198         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1199                 /* In the AWAIT RESPONSE state, any TC completion is
1200                  * unexpected.  but if the TC has success status, we
1201                  * complete the IO anyway.
1202                  */
1203                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1204                 ireq->sci_status = SCI_SUCCESS;
1205                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1206                 break;
1207         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
1208         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
1209         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
1210         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
1211                 /* These status has been seen in a specific LSI
1212                  * expander, which sometimes is not able to send smp
1213                  * response within 2 ms. This causes our hardware break
1214                  * the connection and set TC completion with one of
1215                  * these SMP_XXX_XX_ERR status. For these type of error,
1216                  * we ask ihost user to retry the request.
1217                  */
1218                 ireq->scu_status = SCU_TASK_DONE_SMP_RESP_TO_ERR;
1219                 ireq->sci_status = SCI_FAILURE_RETRY_REQUIRED;
1220                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1221                 break;
1222         default:
1223                 /* All other completion status cause the IO to be complete.  If a NAK
1224                  * was received, then it is up to the user to retry the request
1225                  */
1226                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1227                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1228                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1229                 break;
1230         }
1231
1232         return SCI_SUCCESS;
1233 }
1234
1235 static enum sci_status
1236 smp_request_await_tc_event(struct isci_request *ireq,
1237                            u32 completion_code)
1238 {
1239         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1240         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1241                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1242                 ireq->sci_status = SCI_SUCCESS;
1243                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1244                 break;
1245         default:
1246                 /* All other completion status cause the IO to be
1247                  * complete.  If a NAK was received, then it is up to
1248                  * the user to retry the request.
1249                  */
1250                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1251                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1252                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1253                 break;
1254         }
1255
1256         return SCI_SUCCESS;
1257 }
1258
1259 static struct scu_sgl_element *pio_sgl_next(struct isci_stp_request *stp_req)
1260 {
1261         struct scu_sgl_element *sgl;
1262         struct scu_sgl_element_pair *sgl_pair;
1263         struct isci_request *ireq = to_ireq(stp_req);
1264         struct isci_stp_pio_sgl *pio_sgl = &stp_req->sgl;
1265
1266         sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
1267         if (!sgl_pair)
1268                 sgl = NULL;
1269         else if (pio_sgl->set == SCU_SGL_ELEMENT_PAIR_A) {
1270                 if (sgl_pair->B.address_lower == 0 &&
1271                     sgl_pair->B.address_upper == 0) {
1272                         sgl = NULL;
1273                 } else {
1274                         pio_sgl->set = SCU_SGL_ELEMENT_PAIR_B;
1275                         sgl = &sgl_pair->B;
1276                 }
1277         } else {
1278                 if (sgl_pair->next_pair_lower == 0 &&
1279                     sgl_pair->next_pair_upper == 0) {
1280                         sgl = NULL;
1281                 } else {
1282                         pio_sgl->index++;
1283                         pio_sgl->set = SCU_SGL_ELEMENT_PAIR_A;
1284                         sgl_pair = to_sgl_element_pair(ireq, pio_sgl->index);
1285                         sgl = &sgl_pair->A;
1286                 }
1287         }
1288
1289         return sgl;
1290 }
1291
1292 static enum sci_status
1293 stp_request_non_data_await_h2d_tc_event(struct isci_request *ireq,
1294                                         u32 completion_code)
1295 {
1296         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1297         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1298                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1299                 ireq->sci_status = SCI_SUCCESS;
1300                 sci_change_state(&ireq->sm, SCI_REQ_STP_NON_DATA_WAIT_D2H);
1301                 break;
1302
1303         default:
1304                 /* All other completion status cause the IO to be
1305                  * complete.  If a NAK was received, then it is up to
1306                  * the user to retry the request.
1307                  */
1308                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1309                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1310                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1311                 break;
1312         }
1313
1314         return SCI_SUCCESS;
1315 }
1316
1317 #define SCU_MAX_FRAME_BUFFER_SIZE  0x400  /* 1K is the maximum SCU frame data payload */
1318
1319 /* transmit DATA_FIS from (current sgl + offset) for input
1320  * parameter length. current sgl and offset is alreay stored in the IO request
1321  */
1322 static enum sci_status sci_stp_request_pio_data_out_trasmit_data_frame(
1323         struct isci_request *ireq,
1324         u32 length)
1325 {
1326         struct isci_stp_request *stp_req = &ireq->stp.req;
1327         struct scu_task_context *task_context = ireq->tc;
1328         struct scu_sgl_element_pair *sgl_pair;
1329         struct scu_sgl_element *current_sgl;
1330
1331         /* Recycle the TC and reconstruct it for sending out DATA FIS containing
1332          * for the data from current_sgl+offset for the input length
1333          */
1334         sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
1335         if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A)
1336                 current_sgl = &sgl_pair->A;
1337         else
1338                 current_sgl = &sgl_pair->B;
1339
1340         /* update the TC */
1341         task_context->command_iu_upper = current_sgl->address_upper;
1342         task_context->command_iu_lower = current_sgl->address_lower;
1343         task_context->transfer_length_bytes = length;
1344         task_context->type.stp.fis_type = FIS_DATA;
1345
1346         /* send the new TC out. */
1347         return sci_controller_continue_io(ireq);
1348 }
1349
1350 static enum sci_status sci_stp_request_pio_data_out_transmit_data(struct isci_request *ireq)
1351 {
1352         struct isci_stp_request *stp_req = &ireq->stp.req;
1353         struct scu_sgl_element_pair *sgl_pair;
1354         enum sci_status status = SCI_SUCCESS;
1355         struct scu_sgl_element *sgl;
1356         u32 offset;
1357         u32 len = 0;
1358
1359         offset = stp_req->sgl.offset;
1360         sgl_pair = to_sgl_element_pair(ireq, stp_req->sgl.index);
1361         if (WARN_ONCE(!sgl_pair, "%s: null sgl element", __func__))
1362                 return SCI_FAILURE;
1363
1364         if (stp_req->sgl.set == SCU_SGL_ELEMENT_PAIR_A) {
1365                 sgl = &sgl_pair->A;
1366                 len = sgl_pair->A.length - offset;
1367         } else {
1368                 sgl = &sgl_pair->B;
1369                 len = sgl_pair->B.length - offset;
1370         }
1371
1372         if (stp_req->pio_len == 0)
1373                 return SCI_SUCCESS;
1374
1375         if (stp_req->pio_len >= len) {
1376                 status = sci_stp_request_pio_data_out_trasmit_data_frame(ireq, len);
1377                 if (status != SCI_SUCCESS)
1378                         return status;
1379                 stp_req->pio_len -= len;
1380
1381                 /* update the current sgl, offset and save for future */
1382                 sgl = pio_sgl_next(stp_req);
1383                 offset = 0;
1384         } else if (stp_req->pio_len < len) {
1385                 sci_stp_request_pio_data_out_trasmit_data_frame(ireq, stp_req->pio_len);
1386
1387                 /* Sgl offset will be adjusted and saved for future */
1388                 offset += stp_req->pio_len;
1389                 sgl->address_lower += stp_req->pio_len;
1390                 stp_req->pio_len = 0;
1391         }
1392
1393         stp_req->sgl.offset = offset;
1394
1395         return status;
1396 }
1397
1398 /**
1399  *
1400  * @stp_request: The request that is used for the SGL processing.
1401  * @data_buffer: The buffer of data to be copied.
1402  * @length: The length of the data transfer.
1403  *
1404  * Copy the data from the buffer for the length specified to the IO reqeust SGL
1405  * specified data region. enum sci_status
1406  */
1407 static enum sci_status
1408 sci_stp_request_pio_data_in_copy_data_buffer(struct isci_stp_request *stp_req,
1409                                              u8 *data_buf, u32 len)
1410 {
1411         struct isci_request *ireq;
1412         u8 *src_addr;
1413         int copy_len;
1414         struct sas_task *task;
1415         struct scatterlist *sg;
1416         void *kaddr;
1417         int total_len = len;
1418
1419         ireq = to_ireq(stp_req);
1420         task = isci_request_access_task(ireq);
1421         src_addr = data_buf;
1422
1423         if (task->num_scatter > 0) {
1424                 sg = task->scatter;
1425
1426                 while (total_len > 0) {
1427                         struct page *page = sg_page(sg);
1428
1429                         copy_len = min_t(int, total_len, sg_dma_len(sg));
1430                         kaddr = kmap_atomic(page);
1431                         memcpy(kaddr + sg->offset, src_addr, copy_len);
1432                         kunmap_atomic(kaddr);
1433                         total_len -= copy_len;
1434                         src_addr += copy_len;
1435                         sg = sg_next(sg);
1436                 }
1437         } else {
1438                 BUG_ON(task->total_xfer_len < total_len);
1439                 memcpy(task->scatter, src_addr, total_len);
1440         }
1441
1442         return SCI_SUCCESS;
1443 }
1444
1445 /**
1446  *
1447  * @sci_req: The PIO DATA IN request that is to receive the data.
1448  * @data_buffer: The buffer to copy from.
1449  *
1450  * Copy the data buffer to the io request data region. enum sci_status
1451  */
1452 static enum sci_status sci_stp_request_pio_data_in_copy_data(
1453         struct isci_stp_request *stp_req,
1454         u8 *data_buffer)
1455 {
1456         enum sci_status status;
1457
1458         /*
1459          * If there is less than 1K remaining in the transfer request
1460          * copy just the data for the transfer */
1461         if (stp_req->pio_len < SCU_MAX_FRAME_BUFFER_SIZE) {
1462                 status = sci_stp_request_pio_data_in_copy_data_buffer(
1463                         stp_req, data_buffer, stp_req->pio_len);
1464
1465                 if (status == SCI_SUCCESS)
1466                         stp_req->pio_len = 0;
1467         } else {
1468                 /* We are transfering the whole frame so copy */
1469                 status = sci_stp_request_pio_data_in_copy_data_buffer(
1470                         stp_req, data_buffer, SCU_MAX_FRAME_BUFFER_SIZE);
1471
1472                 if (status == SCI_SUCCESS)
1473                         stp_req->pio_len -= SCU_MAX_FRAME_BUFFER_SIZE;
1474         }
1475
1476         return status;
1477 }
1478
1479 static enum sci_status
1480 stp_request_pio_await_h2d_completion_tc_event(struct isci_request *ireq,
1481                                               u32 completion_code)
1482 {
1483         enum sci_status status = SCI_SUCCESS;
1484
1485         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1486         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1487                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1488                 ireq->sci_status = SCI_SUCCESS;
1489                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1490                 break;
1491
1492         default:
1493                 /* All other completion status cause the IO to be
1494                  * complete.  If a NAK was received, then it is up to
1495                  * the user to retry the request.
1496                  */
1497                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1498                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1499                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1500                 break;
1501         }
1502
1503         return status;
1504 }
1505
1506 static enum sci_status
1507 pio_data_out_tx_done_tc_event(struct isci_request *ireq,
1508                               u32 completion_code)
1509 {
1510         enum sci_status status = SCI_SUCCESS;
1511         bool all_frames_transferred = false;
1512         struct isci_stp_request *stp_req = &ireq->stp.req;
1513
1514         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
1515         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
1516                 /* Transmit data */
1517                 if (stp_req->pio_len != 0) {
1518                         status = sci_stp_request_pio_data_out_transmit_data(ireq);
1519                         if (status == SCI_SUCCESS) {
1520                                 if (stp_req->pio_len == 0)
1521                                         all_frames_transferred = true;
1522                         }
1523                 } else if (stp_req->pio_len == 0) {
1524                         /*
1525                          * this will happen if the all data is written at the
1526                          * first time after the pio setup fis is received
1527                          */
1528                         all_frames_transferred  = true;
1529                 }
1530
1531                 /* all data transferred. */
1532                 if (all_frames_transferred) {
1533                         /*
1534                          * Change the state to SCI_REQ_STP_PIO_DATA_IN
1535                          * and wait for PIO_SETUP fis / or D2H REg fis. */
1536                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1537                 }
1538                 break;
1539
1540         default:
1541                 /*
1542                  * All other completion status cause the IO to be complete.
1543                  * If a NAK was received, then it is up to the user to retry
1544                  * the request.
1545                  */
1546                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
1547                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1548                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1549                 break;
1550         }
1551
1552         return status;
1553 }
1554
1555 static enum sci_status sci_stp_request_udma_general_frame_handler(struct isci_request *ireq,
1556                                                                        u32 frame_index)
1557 {
1558         struct isci_host *ihost = ireq->owning_controller;
1559         struct dev_to_host_fis *frame_header;
1560         enum sci_status status;
1561         u32 *frame_buffer;
1562
1563         status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1564                                                                frame_index,
1565                                                                (void **)&frame_header);
1566
1567         if ((status == SCI_SUCCESS) &&
1568             (frame_header->fis_type == FIS_REGD2H)) {
1569                 sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1570                                                               frame_index,
1571                                                               (void **)&frame_buffer);
1572
1573                 sci_controller_copy_sata_response(&ireq->stp.rsp,
1574                                                        frame_header,
1575                                                        frame_buffer);
1576         }
1577
1578         sci_controller_release_frame(ihost, frame_index);
1579
1580         return status;
1581 }
1582
1583 static enum sci_status process_unsolicited_fis(struct isci_request *ireq,
1584                                                u32 frame_index)
1585 {
1586         struct isci_host *ihost = ireq->owning_controller;
1587         enum sci_status status;
1588         struct dev_to_host_fis *frame_header;
1589         u32 *frame_buffer;
1590
1591         status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1592                                                           frame_index,
1593                                                           (void **)&frame_header);
1594
1595         if (status != SCI_SUCCESS)
1596                 return status;
1597
1598         if (frame_header->fis_type != FIS_REGD2H) {
1599                 dev_err(&ireq->isci_host->pdev->dev,
1600                         "%s ERROR: invalid fis type 0x%X\n",
1601                         __func__, frame_header->fis_type);
1602                 return SCI_FAILURE;
1603         }
1604
1605         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1606                                                  frame_index,
1607                                                  (void **)&frame_buffer);
1608
1609         sci_controller_copy_sata_response(&ireq->stp.rsp,
1610                                           (u32 *)frame_header,
1611                                           frame_buffer);
1612
1613         /* Frame has been decoded return it to the controller */
1614         sci_controller_release_frame(ihost, frame_index);
1615
1616         return status;
1617 }
1618
1619 static enum sci_status atapi_d2h_reg_frame_handler(struct isci_request *ireq,
1620                                                    u32 frame_index)
1621 {
1622         struct sas_task *task = isci_request_access_task(ireq);
1623         enum sci_status status;
1624
1625         status = process_unsolicited_fis(ireq, frame_index);
1626
1627         if (status == SCI_SUCCESS) {
1628                 if (ireq->stp.rsp.status & ATA_ERR)
1629                         status = SCI_IO_FAILURE_RESPONSE_VALID;
1630         } else {
1631                 status = SCI_IO_FAILURE_RESPONSE_VALID;
1632         }
1633
1634         if (status != SCI_SUCCESS) {
1635                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1636                 ireq->sci_status = status;
1637         } else {
1638                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1639                 ireq->sci_status = SCI_SUCCESS;
1640         }
1641
1642         /* the d2h ufi is the end of non-data commands */
1643         if (task->data_dir == DMA_NONE)
1644                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1645
1646         return status;
1647 }
1648
1649 static void scu_atapi_reconstruct_raw_frame_task_context(struct isci_request *ireq)
1650 {
1651         struct ata_device *dev = sas_to_ata_dev(ireq->target_device->domain_dev);
1652         void *atapi_cdb = ireq->ttype_ptr.io_task_ptr->ata_task.atapi_packet;
1653         struct scu_task_context *task_context = ireq->tc;
1654
1655         /* fill in the SCU Task Context for a DATA fis containing CDB in Raw Frame
1656          * type. The TC for previous Packet fis was already there, we only need to
1657          * change the H2D fis content.
1658          */
1659         memset(&ireq->stp.cmd, 0, sizeof(struct host_to_dev_fis));
1660         memcpy(((u8 *)&ireq->stp.cmd + sizeof(u32)), atapi_cdb, ATAPI_CDB_LEN);
1661         memset(&(task_context->type.stp), 0, sizeof(struct stp_task_context));
1662         task_context->type.stp.fis_type = FIS_DATA;
1663         task_context->transfer_length_bytes = dev->cdb_len;
1664 }
1665
1666 static void scu_atapi_construct_task_context(struct isci_request *ireq)
1667 {
1668         struct ata_device *dev = sas_to_ata_dev(ireq->target_device->domain_dev);
1669         struct sas_task *task = isci_request_access_task(ireq);
1670         struct scu_task_context *task_context = ireq->tc;
1671         int cdb_len = dev->cdb_len;
1672
1673         /* reference: SSTL 1.13.4.2
1674          * task_type, sata_direction
1675          */
1676         if (task->data_dir == DMA_TO_DEVICE) {
1677                 task_context->task_type = SCU_TASK_TYPE_PACKET_DMA_OUT;
1678                 task_context->sata_direction = 0;
1679         } else {
1680                 /* todo: for NO_DATA command, we need to send out raw frame. */
1681                 task_context->task_type = SCU_TASK_TYPE_PACKET_DMA_IN;
1682                 task_context->sata_direction = 1;
1683         }
1684
1685         memset(&task_context->type.stp, 0, sizeof(task_context->type.stp));
1686         task_context->type.stp.fis_type = FIS_DATA;
1687
1688         memset(&ireq->stp.cmd, 0, sizeof(ireq->stp.cmd));
1689         memcpy(&ireq->stp.cmd.lbal, task->ata_task.atapi_packet, cdb_len);
1690         task_context->ssp_command_iu_length = cdb_len / sizeof(u32);
1691
1692         /* task phase is set to TX_CMD */
1693         task_context->task_phase = 0x1;
1694
1695         /* retry counter */
1696         task_context->stp_retry_count = 0;
1697
1698         /* data transfer size. */
1699         task_context->transfer_length_bytes = task->total_xfer_len;
1700
1701         /* setup sgl */
1702         sci_request_build_sgl(ireq);
1703 }
1704
1705 enum sci_status
1706 sci_io_request_frame_handler(struct isci_request *ireq,
1707                                   u32 frame_index)
1708 {
1709         struct isci_host *ihost = ireq->owning_controller;
1710         struct isci_stp_request *stp_req = &ireq->stp.req;
1711         enum sci_base_request_states state;
1712         enum sci_status status;
1713         ssize_t word_cnt;
1714
1715         state = ireq->sm.current_state_id;
1716         switch (state)  {
1717         case SCI_REQ_STARTED: {
1718                 struct ssp_frame_hdr ssp_hdr;
1719                 void *frame_header;
1720
1721                 sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1722                                                               frame_index,
1723                                                               &frame_header);
1724
1725                 word_cnt = sizeof(struct ssp_frame_hdr) / sizeof(u32);
1726                 sci_swab32_cpy(&ssp_hdr, frame_header, word_cnt);
1727
1728                 if (ssp_hdr.frame_type == SSP_RESPONSE) {
1729                         struct ssp_response_iu *resp_iu;
1730                         ssize_t word_cnt = SSP_RESP_IU_MAX_SIZE / sizeof(u32);
1731
1732                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1733                                                                       frame_index,
1734                                                                       (void **)&resp_iu);
1735
1736                         sci_swab32_cpy(&ireq->ssp.rsp, resp_iu, word_cnt);
1737
1738                         resp_iu = &ireq->ssp.rsp;
1739
1740                         if (resp_iu->datapres == 0x01 ||
1741                             resp_iu->datapres == 0x02) {
1742                                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1743                                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1744                         } else {
1745                                 ireq->scu_status = SCU_TASK_DONE_GOOD;
1746                                 ireq->sci_status = SCI_SUCCESS;
1747                         }
1748                 } else {
1749                         /* not a response frame, why did it get forwarded? */
1750                         dev_err(&ihost->pdev->dev,
1751                                 "%s: SCIC IO Request 0x%p received unexpected "
1752                                 "frame %d type 0x%02x\n", __func__, ireq,
1753                                 frame_index, ssp_hdr.frame_type);
1754                 }
1755
1756                 /*
1757                  * In any case we are done with this frame buffer return it to
1758                  * the controller
1759                  */
1760                 sci_controller_release_frame(ihost, frame_index);
1761
1762                 return SCI_SUCCESS;
1763         }
1764
1765         case SCI_REQ_TASK_WAIT_TC_RESP:
1766                 sci_io_request_copy_response(ireq);
1767                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1768                 sci_controller_release_frame(ihost, frame_index);
1769                 return SCI_SUCCESS;
1770
1771         case SCI_REQ_SMP_WAIT_RESP: {
1772                 struct sas_task *task = isci_request_access_task(ireq);
1773                 struct scatterlist *sg = &task->smp_task.smp_resp;
1774                 void *frame_header, *kaddr;
1775                 u8 *rsp;
1776
1777                 sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1778                                                          frame_index,
1779                                                          &frame_header);
1780                 kaddr = kmap_atomic(sg_page(sg));
1781                 rsp = kaddr + sg->offset;
1782                 sci_swab32_cpy(rsp, frame_header, 1);
1783
1784                 if (rsp[0] == SMP_RESPONSE) {
1785                         void *smp_resp;
1786
1787                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1788                                                                  frame_index,
1789                                                                  &smp_resp);
1790
1791                         word_cnt = (sg->length/4)-1;
1792                         if (word_cnt > 0)
1793                                 word_cnt = min_t(unsigned int, word_cnt,
1794                                                  SCU_UNSOLICITED_FRAME_BUFFER_SIZE/4);
1795                         sci_swab32_cpy(rsp + 4, smp_resp, word_cnt);
1796
1797                         ireq->scu_status = SCU_TASK_DONE_GOOD;
1798                         ireq->sci_status = SCI_SUCCESS;
1799                         sci_change_state(&ireq->sm, SCI_REQ_SMP_WAIT_TC_COMP);
1800                 } else {
1801                         /*
1802                          * This was not a response frame why did it get
1803                          * forwarded?
1804                          */
1805                         dev_err(&ihost->pdev->dev,
1806                                 "%s: SCIC SMP Request 0x%p received unexpected "
1807                                 "frame %d type 0x%02x\n",
1808                                 __func__,
1809                                 ireq,
1810                                 frame_index,
1811                                 rsp[0]);
1812
1813                         ireq->scu_status = SCU_TASK_DONE_SMP_FRM_TYPE_ERR;
1814                         ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
1815                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1816                 }
1817                 kunmap_atomic(kaddr);
1818
1819                 sci_controller_release_frame(ihost, frame_index);
1820
1821                 return SCI_SUCCESS;
1822         }
1823
1824         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
1825                 return sci_stp_request_udma_general_frame_handler(ireq,
1826                                                                        frame_index);
1827
1828         case SCI_REQ_STP_UDMA_WAIT_D2H:
1829                 /* Use the general frame handler to copy the resposne data */
1830                 status = sci_stp_request_udma_general_frame_handler(ireq, frame_index);
1831
1832                 if (status != SCI_SUCCESS)
1833                         return status;
1834
1835                 ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1836                 ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1837                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1838                 return SCI_SUCCESS;
1839
1840         case SCI_REQ_STP_NON_DATA_WAIT_D2H: {
1841                 struct dev_to_host_fis *frame_header;
1842                 u32 *frame_buffer;
1843
1844                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1845                                                                        frame_index,
1846                                                                        (void **)&frame_header);
1847
1848                 if (status != SCI_SUCCESS) {
1849                         dev_err(&ihost->pdev->dev,
1850                                 "%s: SCIC IO Request 0x%p could not get frame "
1851                                 "header for frame index %d, status %x\n",
1852                                 __func__,
1853                                 stp_req,
1854                                 frame_index,
1855                                 status);
1856
1857                         return status;
1858                 }
1859
1860                 switch (frame_header->fis_type) {
1861                 case FIS_REGD2H:
1862                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1863                                                                       frame_index,
1864                                                                       (void **)&frame_buffer);
1865
1866                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1867                                                                frame_header,
1868                                                                frame_buffer);
1869
1870                         /* The command has completed with error */
1871                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1872                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1873                         break;
1874
1875                 default:
1876                         dev_warn(&ihost->pdev->dev,
1877                                  "%s: IO Request:0x%p Frame Id:%d protocol "
1878                                   "violation occurred\n", __func__, stp_req,
1879                                   frame_index);
1880
1881                         ireq->scu_status = SCU_TASK_DONE_UNEXP_FIS;
1882                         ireq->sci_status = SCI_FAILURE_PROTOCOL_VIOLATION;
1883                         break;
1884                 }
1885
1886                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1887
1888                 /* Frame has been decoded return it to the controller */
1889                 sci_controller_release_frame(ihost, frame_index);
1890
1891                 return status;
1892         }
1893
1894         case SCI_REQ_STP_PIO_WAIT_FRAME: {
1895                 struct sas_task *task = isci_request_access_task(ireq);
1896                 struct dev_to_host_fis *frame_header;
1897                 u32 *frame_buffer;
1898
1899                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1900                                                                        frame_index,
1901                                                                        (void **)&frame_header);
1902
1903                 if (status != SCI_SUCCESS) {
1904                         dev_err(&ihost->pdev->dev,
1905                                 "%s: SCIC IO Request 0x%p could not get frame "
1906                                 "header for frame index %d, status %x\n",
1907                                 __func__, stp_req, frame_index, status);
1908                         return status;
1909                 }
1910
1911                 switch (frame_header->fis_type) {
1912                 case FIS_PIO_SETUP:
1913                         /* Get from the frame buffer the PIO Setup Data */
1914                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1915                                                                       frame_index,
1916                                                                       (void **)&frame_buffer);
1917
1918                         /* Get the data from the PIO Setup The SCU Hardware
1919                          * returns first word in the frame_header and the rest
1920                          * of the data is in the frame buffer so we need to
1921                          * back up one dword
1922                          */
1923
1924                         /* transfer_count: first 16bits in the 4th dword */
1925                         stp_req->pio_len = frame_buffer[3] & 0xffff;
1926
1927                         /* status: 4th byte in the 3rd dword */
1928                         stp_req->status = (frame_buffer[2] >> 24) & 0xff;
1929
1930                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1931                                                                frame_header,
1932                                                                frame_buffer);
1933
1934                         ireq->stp.rsp.status = stp_req->status;
1935
1936                         /* The next state is dependent on whether the
1937                          * request was PIO Data-in or Data out
1938                          */
1939                         if (task->data_dir == DMA_FROM_DEVICE) {
1940                                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_IN);
1941                         } else if (task->data_dir == DMA_TO_DEVICE) {
1942                                 /* Transmit data */
1943                                 status = sci_stp_request_pio_data_out_transmit_data(ireq);
1944                                 if (status != SCI_SUCCESS)
1945                                         break;
1946                                 sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_DATA_OUT);
1947                         }
1948                         break;
1949
1950                 case FIS_SETDEVBITS:
1951                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
1952                         break;
1953
1954                 case FIS_REGD2H:
1955                         if (frame_header->status & ATA_BUSY) {
1956                                 /*
1957                                  * Now why is the drive sending a D2H Register
1958                                  * FIS when it is still busy?  Do nothing since
1959                                  * we are still in the right state.
1960                                  */
1961                                 dev_dbg(&ihost->pdev->dev,
1962                                         "%s: SCIC PIO Request 0x%p received "
1963                                         "D2H Register FIS with BSY status "
1964                                         "0x%x\n",
1965                                         __func__,
1966                                         stp_req,
1967                                         frame_header->status);
1968                                 break;
1969                         }
1970
1971                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1972                                                                       frame_index,
1973                                                                       (void **)&frame_buffer);
1974
1975                         sci_controller_copy_sata_response(&ireq->stp.rsp,
1976                                                                frame_header,
1977                                                                frame_buffer);
1978
1979                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
1980                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
1981                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
1982                         break;
1983
1984                 default:
1985                         /* FIXME: what do we do here? */
1986                         break;
1987                 }
1988
1989                 /* Frame is decoded return it to the controller */
1990                 sci_controller_release_frame(ihost, frame_index);
1991
1992                 return status;
1993         }
1994
1995         case SCI_REQ_STP_PIO_DATA_IN: {
1996                 struct dev_to_host_fis *frame_header;
1997                 struct sata_fis_data *frame_buffer;
1998
1999                 status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
2000                                                                        frame_index,
2001                                                                        (void **)&frame_header);
2002
2003                 if (status != SCI_SUCCESS) {
2004                         dev_err(&ihost->pdev->dev,
2005                                 "%s: SCIC IO Request 0x%p could not get frame "
2006                                 "header for frame index %d, status %x\n",
2007                                 __func__,
2008                                 stp_req,
2009                                 frame_index,
2010                                 status);
2011                         return status;
2012                 }
2013
2014                 if (frame_header->fis_type != FIS_DATA) {
2015                         dev_err(&ihost->pdev->dev,
2016                                 "%s: SCIC PIO Request 0x%p received frame %d "
2017                                 "with fis type 0x%02x when expecting a data "
2018                                 "fis.\n",
2019                                 __func__,
2020                                 stp_req,
2021                                 frame_index,
2022                                 frame_header->fis_type);
2023
2024                         ireq->scu_status = SCU_TASK_DONE_GOOD;
2025                         ireq->sci_status = SCI_FAILURE_IO_REQUIRES_SCSI_ABORT;
2026                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2027
2028                         /* Frame is decoded return it to the controller */
2029                         sci_controller_release_frame(ihost, frame_index);
2030                         return status;
2031                 }
2032
2033                 if (stp_req->sgl.index < 0) {
2034                         ireq->saved_rx_frame_index = frame_index;
2035                         stp_req->pio_len = 0;
2036                 } else {
2037                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
2038                                                                       frame_index,
2039                                                                       (void **)&frame_buffer);
2040
2041                         status = sci_stp_request_pio_data_in_copy_data(stp_req,
2042                                                                             (u8 *)frame_buffer);
2043
2044                         /* Frame is decoded return it to the controller */
2045                         sci_controller_release_frame(ihost, frame_index);
2046                 }
2047
2048                 /* Check for the end of the transfer, are there more
2049                  * bytes remaining for this data transfer
2050                  */
2051                 if (status != SCI_SUCCESS || stp_req->pio_len != 0)
2052                         return status;
2053
2054                 if ((stp_req->status & ATA_BUSY) == 0) {
2055                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
2056                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
2057                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2058                 } else {
2059                         sci_change_state(&ireq->sm, SCI_REQ_STP_PIO_WAIT_FRAME);
2060                 }
2061                 return status;
2062         }
2063
2064         case SCI_REQ_ATAPI_WAIT_PIO_SETUP: {
2065                 struct sas_task *task = isci_request_access_task(ireq);
2066
2067                 sci_controller_release_frame(ihost, frame_index);
2068                 ireq->target_device->working_request = ireq;
2069                 if (task->data_dir == DMA_NONE) {
2070                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_TC_COMP);
2071                         scu_atapi_reconstruct_raw_frame_task_context(ireq);
2072                 } else {
2073                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_D2H);
2074                         scu_atapi_construct_task_context(ireq);
2075                 }
2076
2077                 sci_controller_continue_io(ireq);
2078                 return SCI_SUCCESS;
2079         }
2080         case SCI_REQ_ATAPI_WAIT_D2H:
2081                 return atapi_d2h_reg_frame_handler(ireq, frame_index);
2082         case SCI_REQ_ABORTING:
2083                 /*
2084                  * TODO: Is it even possible to get an unsolicited frame in the
2085                  * aborting state?
2086                  */
2087                 sci_controller_release_frame(ihost, frame_index);
2088                 return SCI_SUCCESS;
2089
2090         default:
2091                 dev_warn(&ihost->pdev->dev,
2092                          "%s: SCIC IO Request given unexpected frame %x while "
2093                          "in state %d\n",
2094                          __func__,
2095                          frame_index,
2096                          state);
2097
2098                 sci_controller_release_frame(ihost, frame_index);
2099                 return SCI_FAILURE_INVALID_STATE;
2100         }
2101 }
2102
2103 static enum sci_status stp_request_udma_await_tc_event(struct isci_request *ireq,
2104                                                        u32 completion_code)
2105 {
2106         enum sci_status status = SCI_SUCCESS;
2107
2108         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2109         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2110                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2111                 ireq->sci_status = SCI_SUCCESS;
2112                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2113                 break;
2114         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_UNEXP_FIS):
2115         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_REG_ERR):
2116                 /* We must check ther response buffer to see if the D2H
2117                  * Register FIS was received before we got the TC
2118                  * completion.
2119                  */
2120                 if (ireq->stp.rsp.fis_type == FIS_REGD2H) {
2121                         sci_remote_device_suspend(ireq->target_device,
2122                                                   SCI_SW_SUSPEND_NORMAL);
2123
2124                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
2125                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
2126                         sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2127                 } else {
2128                         /* If we have an error completion status for the
2129                          * TC then we can expect a D2H register FIS from
2130                          * the device so we must change state to wait
2131                          * for it
2132                          */
2133                         sci_change_state(&ireq->sm, SCI_REQ_STP_UDMA_WAIT_D2H);
2134                 }
2135                 break;
2136
2137         /* TODO Check to see if any of these completion status need to
2138          * wait for the device to host register fis.
2139          */
2140         /* TODO We can retry the command for SCU_TASK_DONE_CMD_LL_R_ERR
2141          * - this comes only for B0
2142          */
2143         default:
2144                 /* All other completion status cause the IO to be complete. */
2145                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2146                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2147                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2148                 break;
2149         }
2150
2151         return status;
2152 }
2153
2154 static enum sci_status atapi_raw_completion(struct isci_request *ireq, u32 completion_code,
2155                                                   enum sci_base_request_states next)
2156 {
2157         enum sci_status status = SCI_SUCCESS;
2158
2159         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2160         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
2161                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2162                 ireq->sci_status = SCI_SUCCESS;
2163                 sci_change_state(&ireq->sm, next);
2164                 break;
2165         default:
2166                 /* All other completion status cause the IO to be complete.
2167                  * If a NAK was received, then it is up to the user to retry
2168                  * the request.
2169                  */
2170                 ireq->scu_status = SCU_NORMALIZE_COMPLETION_STATUS(completion_code);
2171                 ireq->sci_status = SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR;
2172
2173                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2174                 break;
2175         }
2176
2177         return status;
2178 }
2179
2180 static enum sci_status atapi_data_tc_completion_handler(struct isci_request *ireq,
2181                                                         u32 completion_code)
2182 {
2183         struct isci_remote_device *idev = ireq->target_device;
2184         struct dev_to_host_fis *d2h = &ireq->stp.rsp;
2185         enum sci_status status = SCI_SUCCESS;
2186
2187         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
2188         case (SCU_TASK_DONE_GOOD << SCU_COMPLETION_TL_STATUS_SHIFT):
2189                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2190                 break;
2191
2192         case (SCU_TASK_DONE_UNEXP_FIS << SCU_COMPLETION_TL_STATUS_SHIFT): {
2193                 u16 len = sci_req_tx_bytes(ireq);
2194
2195                 /* likely non-error data underrrun, workaround missing
2196                  * d2h frame from the controller
2197                  */
2198                 if (d2h->fis_type != FIS_REGD2H) {
2199                         d2h->fis_type = FIS_REGD2H;
2200                         d2h->flags = (1 << 6);
2201                         d2h->status = 0x50;
2202                         d2h->error = 0;
2203                         d2h->lbal = 0;
2204                         d2h->byte_count_low = len & 0xff;
2205                         d2h->byte_count_high = len >> 8;
2206                         d2h->device = 0xa0;
2207                         d2h->lbal_exp = 0;
2208                         d2h->lbam_exp = 0;
2209                         d2h->lbah_exp = 0;
2210                         d2h->_r_a = 0;
2211                         d2h->sector_count = 0x3;
2212                         d2h->sector_count_exp = 0;
2213                         d2h->_r_b = 0;
2214                         d2h->_r_c = 0;
2215                         d2h->_r_d = 0;
2216                 }
2217
2218                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2219                 ireq->sci_status = SCI_SUCCESS_IO_DONE_EARLY;
2220                 status = ireq->sci_status;
2221
2222                 /* the hw will have suspended the rnc, so complete the
2223                  * request upon pending resume
2224                  */
2225                 sci_change_state(&idev->sm, SCI_STP_DEV_ATAPI_ERROR);
2226                 break;
2227         }
2228         case (SCU_TASK_DONE_EXCESS_DATA << SCU_COMPLETION_TL_STATUS_SHIFT):
2229                 /* In this case, there is no UF coming after.
2230                  * compelte the IO now.
2231                  */
2232                 ireq->scu_status = SCU_TASK_DONE_GOOD;
2233                 ireq->sci_status = SCI_SUCCESS;
2234                 sci_change_state(&ireq->sm, SCI_REQ_COMPLETED);
2235                 break;
2236
2237         default:
2238                 if (d2h->fis_type == FIS_REGD2H) {
2239                         /* UF received change the device state to ATAPI_ERROR */
2240                         status = ireq->sci_status;
2241                         sci_change_state(&idev->sm, SCI_STP_DEV_ATAPI_ERROR);
2242                 } else {
2243                         /* If receiving any non-success TC status, no UF
2244                          * received yet, then an UF for the status fis
2245                          * is coming after (XXX: suspect this is
2246                          * actually a protocol error or a bug like the
2247                          * DONE_UNEXP_FIS case)
2248                          */
2249                         ireq->scu_status = SCU_TASK_DONE_CHECK_RESPONSE;
2250                         ireq->sci_status = SCI_FAILURE_IO_RESPONSE_VALID;
2251
2252                         sci_change_state(&ireq->sm, SCI_REQ_ATAPI_WAIT_D2H);
2253                 }
2254                 break;
2255         }
2256
2257         return status;
2258 }
2259
2260 static int sci_request_smp_completion_status_is_tx_suspend(
2261         unsigned int completion_status)
2262 {
2263         switch (completion_status) {
2264         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2265         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2266         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2267         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2268         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2269         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2270                 return 1;
2271         }
2272         return 0;
2273 }
2274
2275 static int sci_request_smp_completion_status_is_tx_rx_suspend(
2276         unsigned int completion_status)
2277 {
2278         return 0; /* There are no Tx/Rx SMP suspend conditions. */
2279 }
2280
2281 static int sci_request_ssp_completion_status_is_tx_suspend(
2282         unsigned int completion_status)
2283 {
2284         switch (completion_status) {
2285         case SCU_TASK_DONE_TX_RAW_CMD_ERR:
2286         case SCU_TASK_DONE_LF_ERR:
2287         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2288         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2289         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2290         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2291         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2292         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2293         case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
2294         case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
2295         case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
2296                 return 1;
2297         }
2298         return 0;
2299 }
2300
2301 static int sci_request_ssp_completion_status_is_tx_rx_suspend(
2302         unsigned int completion_status)
2303 {
2304         return 0; /* There are no Tx/Rx SSP suspend conditions. */
2305 }
2306
2307 static int sci_request_stpsata_completion_status_is_tx_suspend(
2308         unsigned int completion_status)
2309 {
2310         switch (completion_status) {
2311         case SCU_TASK_DONE_TX_RAW_CMD_ERR:
2312         case SCU_TASK_DONE_LL_R_ERR:
2313         case SCU_TASK_DONE_LL_PERR:
2314         case SCU_TASK_DONE_REG_ERR:
2315         case SCU_TASK_DONE_SDB_ERR:
2316         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2317         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2318         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2319         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2320         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2321         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2322         case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
2323         case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
2324         case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
2325                 return 1;
2326         }
2327         return 0;
2328 }
2329
2330
2331 static int sci_request_stpsata_completion_status_is_tx_rx_suspend(
2332         unsigned int completion_status)
2333 {
2334         switch (completion_status) {
2335         case SCU_TASK_DONE_LF_ERR:
2336         case SCU_TASK_DONE_LL_SY_TERM:
2337         case SCU_TASK_DONE_LL_LF_TERM:
2338         case SCU_TASK_DONE_BREAK_RCVD:
2339         case SCU_TASK_DONE_INV_FIS_LEN:
2340         case SCU_TASK_DONE_UNEXP_FIS:
2341         case SCU_TASK_DONE_UNEXP_SDBFIS:
2342         case SCU_TASK_DONE_MAX_PLD_ERR:
2343                 return 1;
2344         }
2345         return 0;
2346 }
2347
2348 static void sci_request_handle_suspending_completions(
2349         struct isci_request *ireq,
2350         u32 completion_code)
2351 {
2352         int is_tx = 0;
2353         int is_tx_rx = 0;
2354
2355         switch (ireq->protocol) {
2356         case SAS_PROTOCOL_SMP:
2357                 is_tx = sci_request_smp_completion_status_is_tx_suspend(
2358                         completion_code);
2359                 is_tx_rx = sci_request_smp_completion_status_is_tx_rx_suspend(
2360                         completion_code);
2361                 break;
2362         case SAS_PROTOCOL_SSP:
2363                 is_tx = sci_request_ssp_completion_status_is_tx_suspend(
2364                         completion_code);
2365                 is_tx_rx = sci_request_ssp_completion_status_is_tx_rx_suspend(
2366                         completion_code);
2367                 break;
2368         case SAS_PROTOCOL_STP:
2369                 is_tx = sci_request_stpsata_completion_status_is_tx_suspend(
2370                         completion_code);
2371                 is_tx_rx =
2372                         sci_request_stpsata_completion_status_is_tx_rx_suspend(
2373                                 completion_code);
2374                 break;
2375         default:
2376                 dev_warn(&ireq->isci_host->pdev->dev,
2377                          "%s: request %p has no valid protocol\n",
2378                          __func__, ireq);
2379                 break;
2380         }
2381         if (is_tx || is_tx_rx) {
2382                 BUG_ON(is_tx && is_tx_rx);
2383
2384                 sci_remote_node_context_suspend(
2385                         &ireq->target_device->rnc,
2386                         SCI_HW_SUSPEND,
2387                         (is_tx_rx) ? SCU_EVENT_TL_RNC_SUSPEND_TX_RX
2388                                    : SCU_EVENT_TL_RNC_SUSPEND_TX);
2389         }
2390 }
2391
2392 enum sci_status
2393 sci_io_request_tc_completion(struct isci_request *ireq,
2394                              u32 completion_code)
2395 {
2396         enum sci_base_request_states state;
2397         struct isci_host *ihost = ireq->owning_controller;
2398
2399         state = ireq->sm.current_state_id;
2400
2401         /* Decode those completions that signal upcoming suspension events. */
2402         sci_request_handle_suspending_completions(
2403                 ireq, SCU_GET_COMPLETION_TL_STATUS(completion_code));
2404
2405         switch (state) {
2406         case SCI_REQ_STARTED:
2407                 return request_started_state_tc_event(ireq, completion_code);
2408
2409         case SCI_REQ_TASK_WAIT_TC_COMP:
2410                 return ssp_task_request_await_tc_event(ireq,
2411                                                        completion_code);
2412
2413         case SCI_REQ_SMP_WAIT_RESP:
2414                 return smp_request_await_response_tc_event(ireq,
2415                                                            completion_code);
2416
2417         case SCI_REQ_SMP_WAIT_TC_COMP:
2418                 return smp_request_await_tc_event(ireq, completion_code);
2419
2420         case SCI_REQ_STP_UDMA_WAIT_TC_COMP:
2421                 return stp_request_udma_await_tc_event(ireq,
2422                                                        completion_code);
2423
2424         case SCI_REQ_STP_NON_DATA_WAIT_H2D:
2425                 return stp_request_non_data_await_h2d_tc_event(ireq,
2426                                                                completion_code);
2427
2428         case SCI_REQ_STP_PIO_WAIT_H2D:
2429                 return stp_request_pio_await_h2d_completion_tc_event(ireq,
2430                                                                      completion_code);
2431
2432         case SCI_REQ_STP_PIO_DATA_OUT:
2433                 return pio_data_out_tx_done_tc_event(ireq, completion_code);
2434
2435         case SCI_REQ_ABORTING:
2436                 return request_aborting_state_tc_event(ireq,
2437                                                        completion_code);
2438
2439         case SCI_REQ_ATAPI_WAIT_H2D:
2440                 return atapi_raw_completion(ireq, completion_code,
2441                                             SCI_REQ_ATAPI_WAIT_PIO_SETUP);
2442
2443         case SCI_REQ_ATAPI_WAIT_TC_COMP:
2444                 return atapi_raw_completion(ireq, completion_code,
2445                                             SCI_REQ_ATAPI_WAIT_D2H);
2446
2447         case SCI_REQ_ATAPI_WAIT_D2H:
2448                 return atapi_data_tc_completion_handler(ireq, completion_code);
2449
2450         default:
2451                 dev_warn(&ihost->pdev->dev, "%s: %x in wrong state %s\n",
2452                          __func__, completion_code, req_state_name(state));
2453                 return SCI_FAILURE_INVALID_STATE;
2454         }
2455 }
2456
2457 /**
2458  * isci_request_process_response_iu() - This function sets the status and
2459  *    response iu, in the task struct, from the request object for the upper
2460  *    layer driver.
2461  * @sas_task: This parameter is the task struct from the upper layer driver.
2462  * @resp_iu: This parameter points to the response iu of the completed request.
2463  * @dev: This parameter specifies the linux device struct.
2464  *
2465  * none.
2466  */
2467 static void isci_request_process_response_iu(
2468         struct sas_task *task,
2469         struct ssp_response_iu *resp_iu,
2470         struct device *dev)
2471 {
2472         dev_dbg(dev,
2473                 "%s: resp_iu = %p "
2474                 "resp_iu->status = 0x%x,\nresp_iu->datapres = %d "
2475                 "resp_iu->response_data_len = %x, "
2476                 "resp_iu->sense_data_len = %x\nrepsonse data: ",
2477                 __func__,
2478                 resp_iu,
2479                 resp_iu->status,
2480                 resp_iu->datapres,
2481                 resp_iu->response_data_len,
2482                 resp_iu->sense_data_len);
2483
2484         task->task_status.stat = resp_iu->status;
2485
2486         /* libsas updates the task status fields based on the response iu. */
2487         sas_ssp_task_response(dev, task, resp_iu);
2488 }
2489
2490 /**
2491  * isci_request_set_open_reject_status() - This function prepares the I/O
2492  *    completion for OPEN_REJECT conditions.
2493  * @request: This parameter is the completed isci_request object.
2494  * @response_ptr: This parameter specifies the service response for the I/O.
2495  * @status_ptr: This parameter specifies the exec status for the I/O.
2496  * @open_rej_reason: This parameter specifies the encoded reason for the
2497  *    abandon-class reject.
2498  *
2499  * none.
2500  */
2501 static void isci_request_set_open_reject_status(
2502         struct isci_request *request,
2503         struct sas_task *task,
2504         enum service_response *response_ptr,
2505         enum exec_status *status_ptr,
2506         enum sas_open_rej_reason open_rej_reason)
2507 {
2508         /* Task in the target is done. */
2509         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2510         *response_ptr                     = SAS_TASK_UNDELIVERED;
2511         *status_ptr                       = SAS_OPEN_REJECT;
2512         task->task_status.open_rej_reason = open_rej_reason;
2513 }
2514
2515 /**
2516  * isci_request_handle_controller_specific_errors() - This function decodes
2517  *    controller-specific I/O completion error conditions.
2518  * @request: This parameter is the completed isci_request object.
2519  * @response_ptr: This parameter specifies the service response for the I/O.
2520  * @status_ptr: This parameter specifies the exec status for the I/O.
2521  *
2522  * none.
2523  */
2524 static void isci_request_handle_controller_specific_errors(
2525         struct isci_remote_device *idev,
2526         struct isci_request *request,
2527         struct sas_task *task,
2528         enum service_response *response_ptr,
2529         enum exec_status *status_ptr)
2530 {
2531         unsigned int cstatus;
2532
2533         cstatus = request->scu_status;
2534
2535         dev_dbg(&request->isci_host->pdev->dev,
2536                 "%s: %p SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR "
2537                 "- controller status = 0x%x\n",
2538                 __func__, request, cstatus);
2539
2540         /* Decode the controller-specific errors; most
2541          * important is to recognize those conditions in which
2542          * the target may still have a task outstanding that
2543          * must be aborted.
2544          *
2545          * Note that there are SCU completion codes being
2546          * named in the decode below for which SCIC has already
2547          * done work to handle them in a way other than as
2548          * a controller-specific completion code; these are left
2549          * in the decode below for completeness sake.
2550          */
2551         switch (cstatus) {
2552         case SCU_TASK_DONE_DMASETUP_DIRERR:
2553         /* Also SCU_TASK_DONE_SMP_FRM_TYPE_ERR: */
2554         case SCU_TASK_DONE_XFERCNT_ERR:
2555                 /* Also SCU_TASK_DONE_SMP_UFI_ERR: */
2556                 if (task->task_proto == SAS_PROTOCOL_SMP) {
2557                         /* SCU_TASK_DONE_SMP_UFI_ERR == Task Done. */
2558                         *response_ptr = SAS_TASK_COMPLETE;
2559
2560                         /* See if the device has been/is being stopped. Note
2561                          * that we ignore the quiesce state, since we are
2562                          * concerned about the actual device state.
2563                          */
2564                         if (!idev)
2565                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2566                         else
2567                                 *status_ptr = SAS_ABORTED_TASK;
2568
2569                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2570                 } else {
2571                         /* Task in the target is not done. */
2572                         *response_ptr = SAS_TASK_UNDELIVERED;
2573
2574                         if (!idev)
2575                                 *status_ptr = SAS_DEVICE_UNKNOWN;
2576                         else
2577                                 *status_ptr = SAM_STAT_TASK_ABORTED;
2578
2579                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2580                 }
2581
2582                 break;
2583
2584         case SCU_TASK_DONE_CRC_ERR:
2585         case SCU_TASK_DONE_NAK_CMD_ERR:
2586         case SCU_TASK_DONE_EXCESS_DATA:
2587         case SCU_TASK_DONE_UNEXP_FIS:
2588         /* Also SCU_TASK_DONE_UNEXP_RESP: */
2589         case SCU_TASK_DONE_VIIT_ENTRY_NV:       /* TODO - conditions? */
2590         case SCU_TASK_DONE_IIT_ENTRY_NV:        /* TODO - conditions? */
2591         case SCU_TASK_DONE_RNCNV_OUTBOUND:      /* TODO - conditions? */
2592                 /* These are conditions in which the target
2593                  * has completed the task, so that no cleanup
2594                  * is necessary.
2595                  */
2596                 *response_ptr = SAS_TASK_COMPLETE;
2597
2598                 /* See if the device has been/is being stopped. Note
2599                  * that we ignore the quiesce state, since we are
2600                  * concerned about the actual device state.
2601                  */
2602                 if (!idev)
2603                         *status_ptr = SAS_DEVICE_UNKNOWN;
2604                 else
2605                         *status_ptr = SAS_ABORTED_TASK;
2606
2607                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2608                 break;
2609
2610
2611         /* Note that the only open reject completion codes seen here will be
2612          * abandon-class codes; all others are automatically retried in the SCU.
2613          */
2614         case SCU_TASK_OPEN_REJECT_WRONG_DESTINATION:
2615
2616                 isci_request_set_open_reject_status(
2617                         request, task, response_ptr, status_ptr,
2618                         SAS_OREJ_WRONG_DEST);
2619                 break;
2620
2621         case SCU_TASK_OPEN_REJECT_ZONE_VIOLATION:
2622
2623                 /* Note - the return of AB0 will change when
2624                  * libsas implements detection of zone violations.
2625                  */
2626                 isci_request_set_open_reject_status(
2627                         request, task, response_ptr, status_ptr,
2628                         SAS_OREJ_RESV_AB0);
2629                 break;
2630
2631         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_1:
2632
2633                 isci_request_set_open_reject_status(
2634                         request, task, response_ptr, status_ptr,
2635                         SAS_OREJ_RESV_AB1);
2636                 break;
2637
2638         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_2:
2639
2640                 isci_request_set_open_reject_status(
2641                         request, task, response_ptr, status_ptr,
2642                         SAS_OREJ_RESV_AB2);
2643                 break;
2644
2645         case SCU_TASK_OPEN_REJECT_RESERVED_ABANDON_3:
2646
2647                 isci_request_set_open_reject_status(
2648                         request, task, response_ptr, status_ptr,
2649                         SAS_OREJ_RESV_AB3);
2650                 break;
2651
2652         case SCU_TASK_OPEN_REJECT_BAD_DESTINATION:
2653
2654                 isci_request_set_open_reject_status(
2655                         request, task, response_ptr, status_ptr,
2656                         SAS_OREJ_BAD_DEST);
2657                 break;
2658
2659         case SCU_TASK_OPEN_REJECT_STP_RESOURCES_BUSY:
2660
2661                 isci_request_set_open_reject_status(
2662                         request, task, response_ptr, status_ptr,
2663                         SAS_OREJ_STP_NORES);
2664                 break;
2665
2666         case SCU_TASK_OPEN_REJECT_PROTOCOL_NOT_SUPPORTED:
2667
2668                 isci_request_set_open_reject_status(
2669                         request, task, response_ptr, status_ptr,
2670                         SAS_OREJ_EPROTO);
2671                 break;
2672
2673         case SCU_TASK_OPEN_REJECT_CONNECTION_RATE_NOT_SUPPORTED:
2674
2675                 isci_request_set_open_reject_status(
2676                         request, task, response_ptr, status_ptr,
2677                         SAS_OREJ_CONN_RATE);
2678                 break;
2679
2680         case SCU_TASK_DONE_LL_R_ERR:
2681         /* Also SCU_TASK_DONE_ACK_NAK_TO: */
2682         case SCU_TASK_DONE_LL_PERR:
2683         case SCU_TASK_DONE_LL_SY_TERM:
2684         /* Also SCU_TASK_DONE_NAK_ERR:*/
2685         case SCU_TASK_DONE_LL_LF_TERM:
2686         /* Also SCU_TASK_DONE_DATA_LEN_ERR: */
2687         case SCU_TASK_DONE_LL_ABORT_ERR:
2688         case SCU_TASK_DONE_SEQ_INV_TYPE:
2689         /* Also SCU_TASK_DONE_UNEXP_XR: */
2690         case SCU_TASK_DONE_XR_IU_LEN_ERR:
2691         case SCU_TASK_DONE_INV_FIS_LEN:
2692         /* Also SCU_TASK_DONE_XR_WD_LEN: */
2693         case SCU_TASK_DONE_SDMA_ERR:
2694         case SCU_TASK_DONE_OFFSET_ERR:
2695         case SCU_TASK_DONE_MAX_PLD_ERR:
2696         case SCU_TASK_DONE_LF_ERR:
2697         case SCU_TASK_DONE_SMP_RESP_TO_ERR:  /* Escalate to dev reset? */
2698         case SCU_TASK_DONE_SMP_LL_RX_ERR:
2699         case SCU_TASK_DONE_UNEXP_DATA:
2700         case SCU_TASK_DONE_UNEXP_SDBFIS:
2701         case SCU_TASK_DONE_REG_ERR:
2702         case SCU_TASK_DONE_SDB_ERR:
2703         case SCU_TASK_DONE_TASK_ABORT:
2704         default:
2705                 /* Task in the target is not done. */
2706                 *response_ptr = SAS_TASK_UNDELIVERED;
2707                 *status_ptr = SAM_STAT_TASK_ABORTED;
2708
2709                 if (task->task_proto == SAS_PROTOCOL_SMP)
2710                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2711                 else
2712                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2713                 break;
2714         }
2715 }
2716
2717 static void isci_process_stp_response(struct sas_task *task, struct dev_to_host_fis *fis)
2718 {
2719         struct task_status_struct *ts = &task->task_status;
2720         struct ata_task_resp *resp = (void *)&ts->buf[0];
2721
2722         resp->frame_len = sizeof(*fis);
2723         memcpy(resp->ending_fis, fis, sizeof(*fis));
2724         ts->buf_valid_size = sizeof(*resp);
2725
2726         /* If the device fault bit is set in the status register, then
2727          * set the sense data and return.
2728          */
2729         if (fis->status & ATA_DF)
2730                 ts->stat = SAS_PROTO_RESPONSE;
2731         else if (fis->status & ATA_ERR)
2732                 ts->stat = SAM_STAT_CHECK_CONDITION;
2733         else
2734                 ts->stat = SAM_STAT_GOOD;
2735
2736         ts->resp = SAS_TASK_COMPLETE;
2737 }
2738
2739 static void isci_request_io_request_complete(struct isci_host *ihost,
2740                                              struct isci_request *request,
2741                                              enum sci_io_status completion_status)
2742 {
2743         struct sas_task *task = isci_request_access_task(request);
2744         struct ssp_response_iu *resp_iu;
2745         unsigned long task_flags;
2746         struct isci_remote_device *idev = request->target_device;
2747         enum service_response response = SAS_TASK_UNDELIVERED;
2748         enum exec_status status = SAS_ABORTED_TASK;
2749
2750         dev_dbg(&ihost->pdev->dev,
2751                 "%s: request = %p, task = %p, "
2752                 "task->data_dir = %d completion_status = 0x%x\n",
2753                 __func__, request, task, task->data_dir, completion_status);
2754
2755         /* The request is done from an SCU HW perspective. */
2756
2757         /* This is an active request being completed from the core. */
2758         switch (completion_status) {
2759
2760         case SCI_IO_FAILURE_RESPONSE_VALID:
2761                 dev_dbg(&ihost->pdev->dev,
2762                         "%s: SCI_IO_FAILURE_RESPONSE_VALID (%p/%p)\n",
2763                         __func__, request, task);
2764
2765                 if (sas_protocol_ata(task->task_proto)) {
2766                         isci_process_stp_response(task, &request->stp.rsp);
2767                 } else if (SAS_PROTOCOL_SSP == task->task_proto) {
2768
2769                         /* crack the iu response buffer. */
2770                         resp_iu = &request->ssp.rsp;
2771                         isci_request_process_response_iu(task, resp_iu,
2772                                                          &ihost->pdev->dev);
2773
2774                 } else if (SAS_PROTOCOL_SMP == task->task_proto) {
2775
2776                         dev_err(&ihost->pdev->dev,
2777                                 "%s: SCI_IO_FAILURE_RESPONSE_VALID: "
2778                                         "SAS_PROTOCOL_SMP protocol\n",
2779                                 __func__);
2780
2781                 } else
2782                         dev_err(&ihost->pdev->dev,
2783                                 "%s: unknown protocol\n", __func__);
2784
2785                 /* use the task status set in the task struct by the
2786                 * isci_request_process_response_iu call.
2787                 */
2788                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2789                 response = task->task_status.resp;
2790                 status = task->task_status.stat;
2791                 break;
2792
2793         case SCI_IO_SUCCESS:
2794         case SCI_IO_SUCCESS_IO_DONE_EARLY:
2795
2796                 response = SAS_TASK_COMPLETE;
2797                 status   = SAM_STAT_GOOD;
2798                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2799
2800                 if (completion_status == SCI_IO_SUCCESS_IO_DONE_EARLY) {
2801
2802                         /* This was an SSP / STP / SATA transfer.
2803                         * There is a possibility that less data than
2804                         * the maximum was transferred.
2805                         */
2806                         u32 transferred_length = sci_req_tx_bytes(request);
2807
2808                         task->task_status.residual
2809                                 = task->total_xfer_len - transferred_length;
2810
2811                         /* If there were residual bytes, call this an
2812                         * underrun.
2813                         */
2814                         if (task->task_status.residual != 0)
2815                                 status = SAS_DATA_UNDERRUN;
2816
2817                         dev_dbg(&ihost->pdev->dev,
2818                                 "%s: SCI_IO_SUCCESS_IO_DONE_EARLY %d\n",
2819                                 __func__, status);
2820
2821                 } else
2822                         dev_dbg(&ihost->pdev->dev, "%s: SCI_IO_SUCCESS\n",
2823                                 __func__);
2824                 break;
2825
2826         case SCI_IO_FAILURE_TERMINATED:
2827
2828                 dev_dbg(&ihost->pdev->dev,
2829                         "%s: SCI_IO_FAILURE_TERMINATED (%p/%p)\n",
2830                         __func__, request, task);
2831
2832                 /* The request was terminated explicitly. */
2833                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2834                 response = SAS_TASK_UNDELIVERED;
2835
2836                 /* See if the device has been/is being stopped. Note
2837                 * that we ignore the quiesce state, since we are
2838                 * concerned about the actual device state.
2839                 */
2840                 if (!idev)
2841                         status = SAS_DEVICE_UNKNOWN;
2842                 else
2843                         status = SAS_ABORTED_TASK;
2844                 break;
2845
2846         case SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR:
2847
2848                 isci_request_handle_controller_specific_errors(idev, request,
2849                                                                task, &response,
2850                                                                &status);
2851                 break;
2852
2853         case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
2854                 /* This is a special case, in that the I/O completion
2855                 * is telling us that the device needs a reset.
2856                 * In order for the device reset condition to be
2857                 * noticed, the I/O has to be handled in the error
2858                 * handler.  Set the reset flag and cause the
2859                 * SCSI error thread to be scheduled.
2860                 */
2861                 spin_lock_irqsave(&task->task_state_lock, task_flags);
2862                 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
2863                 spin_unlock_irqrestore(&task->task_state_lock, task_flags);
2864
2865                 /* Fail the I/O. */
2866                 response = SAS_TASK_UNDELIVERED;
2867                 status = SAM_STAT_TASK_ABORTED;
2868
2869                 clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2870                 break;
2871
2872         case SCI_FAILURE_RETRY_REQUIRED:
2873
2874                 /* Fail the I/O so it can be retried. */
2875                 response = SAS_TASK_UNDELIVERED;
2876                 if (!idev)
2877                         status = SAS_DEVICE_UNKNOWN;
2878                 else
2879                         status = SAS_ABORTED_TASK;
2880
2881                 set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2882                 break;
2883
2884
2885         default:
2886                 /* Catch any otherwise unhandled error codes here. */
2887                 dev_dbg(&ihost->pdev->dev,
2888                         "%s: invalid completion code: 0x%x - "
2889                                 "isci_request = %p\n",
2890                         __func__, completion_status, request);
2891
2892                 response = SAS_TASK_UNDELIVERED;
2893
2894                 /* See if the device has been/is being stopped. Note
2895                 * that we ignore the quiesce state, since we are
2896                 * concerned about the actual device state.
2897                 */
2898                 if (!idev)
2899                         status = SAS_DEVICE_UNKNOWN;
2900                 else
2901                         status = SAS_ABORTED_TASK;
2902
2903                 if (SAS_PROTOCOL_SMP == task->task_proto)
2904                         set_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2905                 else
2906                         clear_bit(IREQ_COMPLETE_IN_TARGET, &request->flags);
2907                 break;
2908         }
2909
2910         switch (task->task_proto) {
2911         case SAS_PROTOCOL_SSP:
2912                 if (task->data_dir == DMA_NONE)
2913                         break;
2914                 if (task->num_scatter == 0)
2915                         /* 0 indicates a single dma address */
2916                         dma_unmap_single(&ihost->pdev->dev,
2917                                          request->zero_scatter_daddr,
2918                                          task->total_xfer_len, task->data_dir);
2919                 else  /* unmap the sgl dma addresses */
2920                         dma_unmap_sg(&ihost->pdev->dev, task->scatter,
2921                                      request->num_sg_entries, task->data_dir);
2922                 break;
2923         case SAS_PROTOCOL_SMP: {
2924                 struct scatterlist *sg = &task->smp_task.smp_req;
2925                 struct smp_req *smp_req;
2926                 void *kaddr;
2927
2928                 dma_unmap_sg(&ihost->pdev->dev, sg, 1, DMA_TO_DEVICE);
2929
2930                 /* need to swab it back in case the command buffer is re-used */
2931                 kaddr = kmap_atomic(sg_page(sg));
2932                 smp_req = kaddr + sg->offset;
2933                 sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
2934                 kunmap_atomic(kaddr);
2935                 break;
2936         }
2937         default:
2938                 break;
2939         }
2940
2941         spin_lock_irqsave(&task->task_state_lock, task_flags);
2942
2943         task->task_status.resp = response;
2944         task->task_status.stat = status;
2945
2946         if (test_bit(IREQ_COMPLETE_IN_TARGET, &request->flags)) {
2947                 /* Normal notification (task_done) */
2948                 task->task_state_flags |= SAS_TASK_STATE_DONE;
2949                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
2950                                             SAS_TASK_STATE_PENDING);
2951         }
2952         spin_unlock_irqrestore(&task->task_state_lock, task_flags);
2953
2954         /* complete the io request to the core. */
2955         sci_controller_complete_io(ihost, request->target_device, request);
2956
2957         /* set terminated handle so it cannot be completed or
2958          * terminated again, and to cause any calls into abort
2959          * task to recognize the already completed case.
2960          */
2961         set_bit(IREQ_TERMINATED, &request->flags);
2962
2963         ireq_done(ihost, request, task);
2964 }
2965
2966 static void sci_request_started_state_enter(struct sci_base_state_machine *sm)
2967 {
2968         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
2969         struct domain_device *dev = ireq->target_device->domain_dev;
2970         enum sci_base_request_states state;
2971         struct sas_task *task;
2972
2973         /* XXX as hch said always creating an internal sas_task for tmf
2974          * requests would simplify the driver
2975          */
2976         task = (test_bit(IREQ_TMF, &ireq->flags)) ? NULL : isci_request_access_task(ireq);
2977
2978         /* all unaccelerated request types (non ssp or ncq) handled with
2979          * substates
2980          */
2981         if (!task && dev->dev_type == SAS_END_DEVICE) {
2982                 state = SCI_REQ_TASK_WAIT_TC_COMP;
2983         } else if (task && task->task_proto == SAS_PROTOCOL_SMP) {
2984                 state = SCI_REQ_SMP_WAIT_RESP;
2985         } else if (task && sas_protocol_ata(task->task_proto) &&
2986                    !task->ata_task.use_ncq) {
2987                 if (dev->sata_dev.command_set == ATAPI_COMMAND_SET &&
2988                         task->ata_task.fis.command == ATA_CMD_PACKET) {
2989                         state = SCI_REQ_ATAPI_WAIT_H2D;
2990                 } else if (task->data_dir == DMA_NONE) {
2991                         state = SCI_REQ_STP_NON_DATA_WAIT_H2D;
2992                 } else if (task->ata_task.dma_xfer) {
2993                         state = SCI_REQ_STP_UDMA_WAIT_TC_COMP;
2994                 } else /* PIO */ {
2995                         state = SCI_REQ_STP_PIO_WAIT_H2D;
2996                 }
2997         } else {
2998                 /* SSP or NCQ are fully accelerated, no substates */
2999                 return;
3000         }
3001         sci_change_state(sm, state);
3002 }
3003
3004 static void sci_request_completed_state_enter(struct sci_base_state_machine *sm)
3005 {
3006         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3007         struct isci_host *ihost = ireq->owning_controller;
3008
3009         /* Tell the SCI_USER that the IO request is complete */
3010         if (!test_bit(IREQ_TMF, &ireq->flags))
3011                 isci_request_io_request_complete(ihost, ireq,
3012                                                  ireq->sci_status);
3013         else
3014                 isci_task_request_complete(ihost, ireq, ireq->sci_status);
3015 }
3016
3017 static void sci_request_aborting_state_enter(struct sci_base_state_machine *sm)
3018 {
3019         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3020
3021         /* Setting the abort bit in the Task Context is required by the silicon. */
3022         ireq->tc->abort = 1;
3023 }
3024
3025 static void sci_stp_request_started_non_data_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3026 {
3027         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3028
3029         ireq->target_device->working_request = ireq;
3030 }
3031
3032 static void sci_stp_request_started_pio_await_h2d_completion_enter(struct sci_base_state_machine *sm)
3033 {
3034         struct isci_request *ireq = container_of(sm, typeof(*ireq), sm);
3035
3036         ireq->target_device->working_request = ireq;
3037 }
3038
3039 static const struct sci_base_state sci_request_state_table[] = {
3040         [SCI_REQ_INIT] = { },
3041         [SCI_REQ_CONSTRUCTED] = { },
3042         [SCI_REQ_STARTED] = {
3043                 .enter_state = sci_request_started_state_enter,
3044         },
3045         [SCI_REQ_STP_NON_DATA_WAIT_H2D] = {
3046                 .enter_state = sci_stp_request_started_non_data_await_h2d_completion_enter,
3047         },
3048         [SCI_REQ_STP_NON_DATA_WAIT_D2H] = { },
3049         [SCI_REQ_STP_PIO_WAIT_H2D] = {
3050                 .enter_state = sci_stp_request_started_pio_await_h2d_completion_enter,
3051         },
3052         [SCI_REQ_STP_PIO_WAIT_FRAME] = { },
3053         [SCI_REQ_STP_PIO_DATA_IN] = { },
3054         [SCI_REQ_STP_PIO_DATA_OUT] = { },
3055         [SCI_REQ_STP_UDMA_WAIT_TC_COMP] = { },
3056         [SCI_REQ_STP_UDMA_WAIT_D2H] = { },
3057         [SCI_REQ_TASK_WAIT_TC_COMP] = { },
3058         [SCI_REQ_TASK_WAIT_TC_RESP] = { },
3059         [SCI_REQ_SMP_WAIT_RESP] = { },
3060         [SCI_REQ_SMP_WAIT_TC_COMP] = { },
3061         [SCI_REQ_ATAPI_WAIT_H2D] = { },
3062         [SCI_REQ_ATAPI_WAIT_PIO_SETUP] = { },
3063         [SCI_REQ_ATAPI_WAIT_D2H] = { },
3064         [SCI_REQ_ATAPI_WAIT_TC_COMP] = { },
3065         [SCI_REQ_COMPLETED] = {
3066                 .enter_state = sci_request_completed_state_enter,
3067         },
3068         [SCI_REQ_ABORTING] = {
3069                 .enter_state = sci_request_aborting_state_enter,
3070         },
3071         [SCI_REQ_FINAL] = { },
3072 };
3073
3074 static void
3075 sci_general_request_construct(struct isci_host *ihost,
3076                                    struct isci_remote_device *idev,
3077                                    struct isci_request *ireq)
3078 {
3079         sci_init_sm(&ireq->sm, sci_request_state_table, SCI_REQ_INIT);
3080
3081         ireq->target_device = idev;
3082         ireq->protocol = SAS_PROTOCOL_NONE;
3083         ireq->saved_rx_frame_index = SCU_INVALID_FRAME_INDEX;
3084
3085         ireq->sci_status   = SCI_SUCCESS;
3086         ireq->scu_status   = 0;
3087         ireq->post_context = 0xFFFFFFFF;
3088 }
3089
3090 static enum sci_status
3091 sci_io_request_construct(struct isci_host *ihost,
3092                           struct isci_remote_device *idev,
3093                           struct isci_request *ireq)
3094 {
3095         struct domain_device *dev = idev->domain_dev;
3096         enum sci_status status = SCI_SUCCESS;
3097
3098         /* Build the common part of the request */
3099         sci_general_request_construct(ihost, idev, ireq);
3100
3101         if (idev->rnc.remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
3102                 return SCI_FAILURE_INVALID_REMOTE_DEVICE;
3103
3104         if (dev->dev_type == SAS_END_DEVICE)
3105                 /* pass */;
3106         else if (dev_is_sata(dev))
3107                 memset(&ireq->stp.cmd, 0, sizeof(ireq->stp.cmd));
3108         else if (dev_is_expander(dev))
3109                 /* pass */;
3110         else
3111                 return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3112
3113         memset(ireq->tc, 0, offsetof(struct scu_task_context, sgl_pair_ab));
3114
3115         return status;
3116 }
3117
3118 enum sci_status sci_task_request_construct(struct isci_host *ihost,
3119                                             struct isci_remote_device *idev,
3120                                             u16 io_tag, struct isci_request *ireq)
3121 {
3122         struct domain_device *dev = idev->domain_dev;
3123         enum sci_status status = SCI_SUCCESS;
3124
3125         /* Build the common part of the request */
3126         sci_general_request_construct(ihost, idev, ireq);
3127
3128         if (dev->dev_type == SAS_END_DEVICE || dev_is_sata(dev)) {
3129                 set_bit(IREQ_TMF, &ireq->flags);
3130                 memset(ireq->tc, 0, sizeof(struct scu_task_context));
3131
3132                 /* Set the protocol indicator. */
3133                 if (dev_is_sata(dev))
3134                         ireq->protocol = SAS_PROTOCOL_STP;
3135                 else
3136                         ireq->protocol = SAS_PROTOCOL_SSP;
3137         } else
3138                 status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3139
3140         return status;
3141 }
3142
3143 static enum sci_status isci_request_ssp_request_construct(
3144         struct isci_request *request)
3145 {
3146         enum sci_status status;
3147
3148         dev_dbg(&request->isci_host->pdev->dev,
3149                 "%s: request = %p\n",
3150                 __func__,
3151                 request);
3152         status = sci_io_request_construct_basic_ssp(request);
3153         return status;
3154 }
3155
3156 static enum sci_status isci_request_stp_request_construct(struct isci_request *ireq)
3157 {
3158         struct sas_task *task = isci_request_access_task(ireq);
3159         struct host_to_dev_fis *fis = &ireq->stp.cmd;
3160         struct ata_queued_cmd *qc = task->uldd_task;
3161         enum sci_status status;
3162
3163         dev_dbg(&ireq->isci_host->pdev->dev,
3164                 "%s: ireq = %p\n",
3165                 __func__,
3166                 ireq);
3167
3168         memcpy(fis, &task->ata_task.fis, sizeof(struct host_to_dev_fis));
3169         if (!task->ata_task.device_control_reg_update)
3170                 fis->flags |= 0x80;
3171         fis->flags &= 0xF0;
3172
3173         status = sci_io_request_construct_basic_sata(ireq);
3174
3175         if (qc && (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
3176                    qc->tf.command == ATA_CMD_FPDMA_READ)) {
3177                 fis->sector_count = qc->tag << 3;
3178                 ireq->tc->type.stp.ncq_tag = qc->tag;
3179         }
3180
3181         return status;
3182 }
3183
3184 static enum sci_status
3185 sci_io_request_construct_smp(struct device *dev,
3186                               struct isci_request *ireq,
3187                               struct sas_task *task)
3188 {
3189         struct scatterlist *sg = &task->smp_task.smp_req;
3190         struct isci_remote_device *idev;
3191         struct scu_task_context *task_context;
3192         struct isci_port *iport;
3193         struct smp_req *smp_req;
3194         void *kaddr;
3195         u8 req_len;
3196         u32 cmd;
3197
3198         kaddr = kmap_atomic(sg_page(sg));
3199         smp_req = kaddr + sg->offset;
3200         /*
3201          * Look at the SMP requests' header fields; for certain SAS 1.x SMP
3202          * functions under SAS 2.0, a zero request length really indicates
3203          * a non-zero default length.
3204          */
3205         if (smp_req->req_len == 0) {
3206                 switch (smp_req->func) {
3207                 case SMP_DISCOVER:
3208                 case SMP_REPORT_PHY_ERR_LOG:
3209                 case SMP_REPORT_PHY_SATA:
3210                 case SMP_REPORT_ROUTE_INFO:
3211                         smp_req->req_len = 2;
3212                         break;
3213                 case SMP_CONF_ROUTE_INFO:
3214                 case SMP_PHY_CONTROL:
3215                 case SMP_PHY_TEST_FUNCTION:
3216                         smp_req->req_len = 9;
3217                         break;
3218                         /* Default - zero is a valid default for 2.0. */
3219                 }
3220         }
3221         req_len = smp_req->req_len;
3222         sci_swab32_cpy(smp_req, smp_req, sg->length / sizeof(u32));
3223         cmd = *(u32 *) smp_req;
3224         kunmap_atomic(kaddr);
3225
3226         if (!dma_map_sg(dev, sg, 1, DMA_TO_DEVICE))
3227                 return SCI_FAILURE;
3228
3229         ireq->protocol = SAS_PROTOCOL_SMP;
3230
3231         /* byte swap the smp request. */
3232
3233         task_context = ireq->tc;
3234
3235         idev = ireq->target_device;
3236         iport = idev->owning_port;
3237
3238         /*
3239          * Fill in the TC with the its required data
3240          * 00h
3241          */
3242         task_context->priority = 0;
3243         task_context->initiator_request = 1;
3244         task_context->connection_rate = idev->connection_rate;
3245         task_context->protocol_engine_index = ISCI_PEG;
3246         task_context->logical_port_index = iport->physical_port_index;
3247         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
3248         task_context->abort = 0;
3249         task_context->valid = SCU_TASK_CONTEXT_VALID;
3250         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
3251
3252         /* 04h */
3253         task_context->remote_node_index = idev->rnc.remote_node_index;
3254         task_context->command_code = 0;
3255         task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;
3256
3257         /* 08h */
3258         task_context->link_layer_control = 0;
3259         task_context->do_not_dma_ssp_good_response = 1;
3260         task_context->strict_ordering = 0;
3261         task_context->control_frame = 1;
3262         task_context->timeout_enable = 0;
3263         task_context->block_guard_enable = 0;
3264
3265         /* 0ch */
3266         task_context->address_modifier = 0;
3267
3268         /* 10h */
3269         task_context->ssp_command_iu_length = req_len;
3270
3271         /* 14h */
3272         task_context->transfer_length_bytes = 0;
3273
3274         /*
3275          * 18h ~ 30h, protocol specific
3276          * since commandIU has been build by framework at this point, we just
3277          * copy the frist DWord from command IU to this location. */
3278         memcpy(&task_context->type.smp, &cmd, sizeof(u32));
3279
3280         /*
3281          * 40h
3282          * "For SMP you could program it to zero. We would prefer that way
3283          * so that done code will be consistent." - Venki
3284          */
3285         task_context->task_phase = 0;
3286
3287         ireq->post_context = (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
3288                               (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
3289                                (iport->physical_port_index <<
3290                                 SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
3291                               ISCI_TAG_TCI(ireq->io_tag));
3292         /*
3293          * Copy the physical address for the command buffer to the SCU Task
3294          * Context command buffer should not contain command header.
3295          */
3296         task_context->command_iu_upper = upper_32_bits(sg_dma_address(sg));
3297         task_context->command_iu_lower = lower_32_bits(sg_dma_address(sg) + sizeof(u32));
3298
3299         /* SMP response comes as UF, so no need to set response IU address. */
3300         task_context->response_iu_upper = 0;
3301         task_context->response_iu_lower = 0;
3302
3303         sci_change_state(&ireq->sm, SCI_REQ_CONSTRUCTED);
3304
3305         return SCI_SUCCESS;
3306 }
3307
3308 /*
3309  * isci_smp_request_build() - This function builds the smp request.
3310  * @ireq: This parameter points to the isci_request allocated in the
3311  *    request construct function.
3312  *
3313  * SCI_SUCCESS on successfull completion, or specific failure code.
3314  */
3315 static enum sci_status isci_smp_request_build(struct isci_request *ireq)
3316 {
3317         struct sas_task *task = isci_request_access_task(ireq);
3318         struct device *dev = &ireq->isci_host->pdev->dev;
3319         enum sci_status status = SCI_FAILURE;
3320
3321         status = sci_io_request_construct_smp(dev, ireq, task);
3322         if (status != SCI_SUCCESS)
3323                 dev_dbg(&ireq->isci_host->pdev->dev,
3324                          "%s: failed with status = %d\n",
3325                          __func__,
3326                          status);
3327
3328         return status;
3329 }
3330
3331 /**
3332  * isci_io_request_build() - This function builds the io request object.
3333  * @ihost: This parameter specifies the ISCI host object
3334  * @request: This parameter points to the isci_request object allocated in the
3335  *    request construct function.
3336  * @sci_device: This parameter is the handle for the sci core's remote device
3337  *    object that is the destination for this request.
3338  *
3339  * SCI_SUCCESS on successfull completion, or specific failure code.
3340  */
3341 static enum sci_status isci_io_request_build(struct isci_host *ihost,
3342                                              struct isci_request *request,
3343                                              struct isci_remote_device *idev)
3344 {
3345         enum sci_status status = SCI_SUCCESS;
3346         struct sas_task *task = isci_request_access_task(request);
3347
3348         dev_dbg(&ihost->pdev->dev,
3349                 "%s: idev = 0x%p; request = %p, "
3350                 "num_scatter = %d\n",
3351                 __func__,
3352                 idev,
3353                 request,
3354                 task->num_scatter);
3355
3356         /* map the sgl addresses, if present.
3357          * libata does the mapping for sata devices
3358          * before we get the request.
3359          */
3360         if (task->num_scatter &&
3361             !sas_protocol_ata(task->task_proto) &&
3362             !(SAS_PROTOCOL_SMP & task->task_proto)) {
3363
3364                 request->num_sg_entries = dma_map_sg(
3365                         &ihost->pdev->dev,
3366                         task->scatter,
3367                         task->num_scatter,
3368                         task->data_dir
3369                         );
3370
3371                 if (request->num_sg_entries == 0)
3372                         return SCI_FAILURE_INSUFFICIENT_RESOURCES;
3373         }
3374
3375         status = sci_io_request_construct(ihost, idev, request);
3376
3377         if (status != SCI_SUCCESS) {
3378                 dev_dbg(&ihost->pdev->dev,
3379                          "%s: failed request construct\n",
3380                          __func__);
3381                 return SCI_FAILURE;
3382         }
3383
3384         switch (task->task_proto) {
3385         case SAS_PROTOCOL_SMP:
3386                 status = isci_smp_request_build(request);
3387                 break;
3388         case SAS_PROTOCOL_SSP:
3389                 status = isci_request_ssp_request_construct(request);
3390                 break;
3391         case SAS_PROTOCOL_SATA:
3392         case SAS_PROTOCOL_STP:
3393         case SAS_PROTOCOL_SATA | SAS_PROTOCOL_STP:
3394                 status = isci_request_stp_request_construct(request);
3395                 break;
3396         default:
3397                 dev_dbg(&ihost->pdev->dev,
3398                          "%s: unknown protocol\n", __func__);
3399                 return SCI_FAILURE;
3400         }
3401
3402         return SCI_SUCCESS;
3403 }
3404
3405 static struct isci_request *isci_request_from_tag(struct isci_host *ihost, u16 tag)
3406 {
3407         struct isci_request *ireq;
3408
3409         ireq = ihost->reqs[ISCI_TAG_TCI(tag)];
3410         ireq->io_tag = tag;
3411         ireq->io_request_completion = NULL;
3412         ireq->flags = 0;
3413         ireq->num_sg_entries = 0;
3414
3415         return ireq;
3416 }
3417
3418 static struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
3419                                                      struct sas_task *task,
3420                                                      u16 tag)
3421 {
3422         struct isci_request *ireq;
3423
3424         ireq = isci_request_from_tag(ihost, tag);
3425         ireq->ttype_ptr.io_task_ptr = task;
3426         clear_bit(IREQ_TMF, &ireq->flags);
3427         task->lldd_task = ireq;
3428
3429         return ireq;
3430 }
3431
3432 struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
3433                                                struct isci_tmf *isci_tmf,
3434                                                u16 tag)
3435 {
3436         struct isci_request *ireq;
3437
3438         ireq = isci_request_from_tag(ihost, tag);
3439         ireq->ttype_ptr.tmf_task_ptr = isci_tmf;
3440         set_bit(IREQ_TMF, &ireq->flags);
3441
3442         return ireq;
3443 }
3444
3445 int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
3446                          struct sas_task *task, u16 tag)
3447 {
3448         enum sci_status status = SCI_FAILURE_UNSUPPORTED_PROTOCOL;
3449         struct isci_request *ireq;
3450         unsigned long flags;
3451         int ret = 0;
3452
3453         /* do common allocation and init of request object. */
3454         ireq = isci_io_request_from_tag(ihost, task, tag);
3455
3456         status = isci_io_request_build(ihost, ireq, idev);
3457         if (status != SCI_SUCCESS) {
3458                 dev_dbg(&ihost->pdev->dev,
3459                          "%s: request_construct failed - status = 0x%x\n",
3460                          __func__,
3461                          status);
3462                 return status;
3463         }
3464
3465         spin_lock_irqsave(&ihost->scic_lock, flags);
3466
3467         if (test_bit(IDEV_IO_NCQERROR, &idev->flags)) {
3468
3469                 if (isci_task_is_ncq_recovery(task)) {
3470
3471                         /* The device is in an NCQ recovery state.  Issue the
3472                          * request on the task side.  Note that it will
3473                          * complete on the I/O request side because the
3474                          * request was built that way (ie.
3475                          * ireq->is_task_management_request is false).
3476                          */
3477                         status = sci_controller_start_task(ihost,
3478                                                             idev,
3479                                                             ireq);
3480                 } else {
3481                         status = SCI_FAILURE;
3482                 }
3483         } else {
3484                 /* send the request, let the core assign the IO TAG.    */
3485                 status = sci_controller_start_io(ihost, idev,
3486                                                   ireq);
3487         }
3488
3489         if (status != SCI_SUCCESS &&
3490             status != SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3491                 dev_dbg(&ihost->pdev->dev,
3492                          "%s: failed request start (0x%x)\n",
3493                          __func__, status);
3494                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
3495                 return status;
3496         }
3497         /* Either I/O started OK, or the core has signaled that
3498          * the device needs a target reset.
3499          */
3500         if (status != SCI_SUCCESS) {
3501                 /* The request did not really start in the
3502                  * hardware, so clear the request handle
3503                  * here so no terminations will be done.
3504                  */
3505                 set_bit(IREQ_TERMINATED, &ireq->flags);
3506         }
3507         spin_unlock_irqrestore(&ihost->scic_lock, flags);
3508
3509         if (status ==
3510             SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
3511                 /* Signal libsas that we need the SCSI error
3512                  * handler thread to work on this I/O and that
3513                  * we want a device reset.
3514                  */
3515                 spin_lock_irqsave(&task->task_state_lock, flags);
3516                 task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
3517                 spin_unlock_irqrestore(&task->task_state_lock, flags);
3518
3519                 /* Cause this task to be scheduled in the SCSI error
3520                  * handler thread.
3521                  */
3522                 sas_task_abort(task);
3523
3524                 /* Change the status, since we are holding
3525                  * the I/O until it is managed by the SCSI
3526                  * error handler.
3527                  */
3528                 status = SCI_SUCCESS;
3529         }
3530
3531         return ret;
3532 }