drivers/scsi/aic94xx/aic94xx_task.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Aic94xx SAS/SATA Tasks
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8
   9 #include <linux/spinlock.h>
  10 #include "aic94xx.h"
  11 #include "aic94xx_sas.h"
  12 #include "aic94xx_hwi.h"
  13
  14 static void asd_unbuild_ata_ascb(struct asd_ascb *a);
  15 static void asd_unbuild_smp_ascb(struct asd_ascb *a);
  16 static void asd_unbuild_ssp_ascb(struct asd_ascb *a);
  17
  18 static void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
  19 {
  20         unsigned long flags;
  21
  22         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
  23         asd_ha->seq.can_queue += num;
  24         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
  25 }
  26
  27 /* DMA_... to our direction translation.
  28  */
  29 static const u8 data_dir_flags[] = {
  30         [DMA_BIDIRECTIONAL]     = DATA_DIR_BYRECIPIENT, /* UNSPECIFIED */
  31         [DMA_TO_DEVICE]         = DATA_DIR_OUT,         /* OUTBOUND */
  32         [DMA_FROM_DEVICE]       = DATA_DIR_IN,          /* INBOUND */
  33         [DMA_NONE]              = DATA_DIR_NONE,        /* NO TRANSFER */
  34 };
  35
  36 static int asd_map_scatterlist(struct sas_task *task,
  37                                struct sg_el *sg_arr,
  38                                gfp_t gfp_flags)
  39 {
  40         struct asd_ascb *ascb = task->lldd_task;
  41         struct asd_ha_struct *asd_ha = ascb->ha;
  42         struct scatterlist *sc;
  43         int num_sg, res;
  44
  45         if (task->data_dir == DMA_NONE)
  46                 return 0;
  47
  48         if (task->num_scatter == 0) {
  49                 void *p = task->scatter;
  50                 dma_addr_t dma = dma_map_single(&asd_ha->pcidev->dev, p,
  51                                                 task->total_xfer_len,
  52                                                 task->data_dir);
  53                 sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
  54                 sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
  55                 sg_arr[0].flags |= ASD_SG_EL_LIST_EOL;
  56                 return 0;
  57         }
  58
  59         /* STP tasks come from libata which has already mapped
  60          * the SG list */
  61         if (sas_protocol_ata(task->task_proto))
  62                 num_sg = task->num_scatter;
  63         else
  64                 num_sg = dma_map_sg(&asd_ha->pcidev->dev, task->scatter,
  65                                     task->num_scatter, task->data_dir);
  66         if (num_sg == 0)
  67                 return -ENOMEM;
  68
  69         if (num_sg > 3) {
  70                 int i;
  71
  72                 ascb->sg_arr = asd_alloc_coherent(asd_ha,
  73                                                   num_sg*sizeof(struct sg_el),
  74                                                   gfp_flags);
  75                 if (!ascb->sg_arr) {
  76                         res = -ENOMEM;
  77                         goto err_unmap;
  78                 }
  79                 for_each_sg(task->scatter, sc, num_sg, i) {
  80                         struct sg_el *sg =
  81                                 &((struct sg_el *)ascb->sg_arr->vaddr)[i];
  82                         sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
  83                         sg->size = cpu_to_le32((u32)sg_dma_len(sc));
  84                         if (i == num_sg-1)
  85                                 sg->flags |= ASD_SG_EL_LIST_EOL;
  86                 }
  87
  88                 for_each_sg(task->scatter, sc, 2, i) {
  89                         sg_arr[i].bus_addr =
  90                                 cpu_to_le64((u64)sg_dma_address(sc));
  91                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
  92                 }
  93                 sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
  94                 sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;
  95
  96                 memset(&sg_arr[2], 0, sizeof(*sg_arr));
  97                 sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
  98         } else {
  99                 int i;
 100                 for_each_sg(task->scatter, sc, num_sg, i) {
 101                         sg_arr[i].bus_addr =
 102                                 cpu_to_le64((u64)sg_dma_address(sc));
 103                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
 104                 }
 105                 sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
 106         }
 107
 108         return 0;
 109 err_unmap:
 110         if (sas_protocol_ata(task->task_proto))
 111                 dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
 112                              task->num_scatter, task->data_dir);
 113         return res;
 114 }
 115
 116 static void asd_unmap_scatterlist(struct asd_ascb *ascb)
 117 {
 118         struct asd_ha_struct *asd_ha = ascb->ha;
 119         struct sas_task *task = ascb->uldd_task;
 120
 121         if (task->data_dir == DMA_NONE)
 122                 return;
 123
 124         if (task->num_scatter == 0) {
 125                 dma_addr_t dma = (dma_addr_t)
 126                        le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
 127                 dma_unmap_single(&ascb->ha->pcidev->dev, dma,
 128                                  task->total_xfer_len, task->data_dir);
 129                 return;
 130         }
 131
 132         asd_free_coherent(asd_ha, ascb->sg_arr);
 133         if (task->task_proto != SAS_PROTOCOL_STP)
 134                 dma_unmap_sg(&asd_ha->pcidev->dev, task->scatter,
 135                              task->num_scatter, task->data_dir);
 136 }
 137
 138 /* ---------- Task complete tasklet ---------- */
 139
 140 static void asd_get_response_tasklet(struct asd_ascb *ascb,
 141                                      struct done_list_struct *dl)
 142 {
 143         struct asd_ha_struct *asd_ha = ascb->ha;
 144         struct sas_task *task = ascb->uldd_task;
 145         struct task_status_struct *ts = &task->task_status;
 146         unsigned long flags;
 147         struct tc_resp_sb_struct {
 148                 __le16 index_escb;
 149                 u8     len_lsb;
 150                 u8     flags;
 151         } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 152
 153 /*      int  size   = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
 154         int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 155         struct asd_ascb *escb;
 156         struct asd_dma_tok *edb;
 157         void *r;
 158
 159         spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 160         escb = asd_tc_index_find(&asd_ha->seq,
 161                                  (int)le16_to_cpu(resp_sb->index_escb));
 162         spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 163
 164         if (!escb) {
 165                 ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 166                 return;
 167         }
 168
 169         ts->buf_valid_size = 0;
 170         edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 171         r = edb->vaddr;
 172         if (task->task_proto == SAS_PROTOCOL_SSP) {
 173                 struct ssp_response_iu *iu =
 174                         r + 16 + sizeof(struct ssp_frame_hdr);
 175
 176                 ts->residual = le32_to_cpu(*(__le32 *)r);
 177
 178                 sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
 179         }  else {
 180                 struct ata_task_resp *resp = (void *) &ts->buf[0];
 181
 182                 ts->residual = le32_to_cpu(*(__le32 *)r);
 183
 184                 if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
 185                         resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
 186                         memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
 187                         ts->buf_valid_size = sizeof(*resp);
 188                 }
 189         }
 190
 191         asd_invalidate_edb(escb, edb_id);
 192 }
 193
 194 static void asd_task_tasklet_complete(struct asd_ascb *ascb,
 195                                       struct done_list_struct *dl)
 196 {
 197         struct sas_task *task = ascb->uldd_task;
 198         struct task_status_struct *ts = &task->task_status;
 199         unsigned long flags;
 200         u8 opcode = dl->opcode;
 201
 202         asd_can_dequeue(ascb->ha, 1);
 203
 204 Again:
 205         switch (opcode) {
 206         case TC_NO_ERROR:
 207                 ts->resp = SAS_TASK_COMPLETE;
 208                 ts->stat = SAM_STAT_GOOD;
 209                 break;
 210         case TC_UNDERRUN:
 211                 ts->resp = SAS_TASK_COMPLETE;
 212                 ts->stat = SAS_DATA_UNDERRUN;
 213                 ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
 214                 break;
 215         case TC_OVERRUN:
 216                 ts->resp = SAS_TASK_COMPLETE;
 217                 ts->stat = SAS_DATA_OVERRUN;
 218                 ts->residual = 0;
 219                 break;
 220         case TC_SSP_RESP:
 221         case TC_ATA_RESP:
 222                 ts->resp = SAS_TASK_COMPLETE;
 223                 ts->stat = SAS_PROTO_RESPONSE;
 224                 asd_get_response_tasklet(ascb, dl);
 225                 break;
 226         case TF_OPEN_REJECT:
 227                 ts->resp = SAS_TASK_UNDELIVERED;
 228                 ts->stat = SAS_OPEN_REJECT;
 229                 if (dl->status_block[1] & 2)
 230                         ts->open_rej_reason = 1 + dl->status_block[2];
 231                 else if (dl->status_block[1] & 1)
 232                         ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
 233                 else
 234                         ts->open_rej_reason = SAS_OREJ_UNKNOWN;
 235                 break;
 236         case TF_OPEN_TO:
 237                 ts->resp = SAS_TASK_UNDELIVERED;
 238                 ts->stat = SAS_OPEN_TO;
 239                 break;
 240         case TF_PHY_DOWN:
 241         case TU_PHY_DOWN:
 242                 ts->resp = SAS_TASK_UNDELIVERED;
 243                 ts->stat = SAS_PHY_DOWN;
 244                 break;
 245         case TI_PHY_DOWN:
 246                 ts->resp = SAS_TASK_COMPLETE;
 247                 ts->stat = SAS_PHY_DOWN;
 248                 break;
 249         case TI_BREAK:
 250         case TI_PROTO_ERR:
 251         case TI_NAK:
 252         case TI_ACK_NAK_TO:
 253         case TF_SMP_XMIT_RCV_ERR:
 254         case TC_ATA_R_ERR_RECV:
 255                 ts->resp = SAS_TASK_COMPLETE;
 256                 ts->stat = SAS_INTERRUPTED;
 257                 break;
 258         case TF_BREAK:
 259         case TU_BREAK:
 260         case TU_ACK_NAK_TO:
 261         case TF_SMPRSP_TO:
 262                 ts->resp = SAS_TASK_UNDELIVERED;
 263                 ts->stat = SAS_DEV_NO_RESPONSE;
 264                 break;
 265         case TF_NAK_RECV:
 266                 ts->resp = SAS_TASK_COMPLETE;
 267                 ts->stat = SAS_NAK_R_ERR;
 268                 break;
 269         case TA_I_T_NEXUS_LOSS:
 270                 opcode = dl->status_block[0];
 271                 goto Again;
 272                 break;
 273         case TF_INV_CONN_HANDLE:
 274                 ts->resp = SAS_TASK_UNDELIVERED;
 275                 ts->stat = SAS_DEVICE_UNKNOWN;
 276                 break;
 277         case TF_REQUESTED_N_PENDING:
 278                 ts->resp = SAS_TASK_UNDELIVERED;
 279                 ts->stat = SAS_PENDING;
 280                 break;
 281         case TC_TASK_CLEARED:
 282         case TA_ON_REQ:
 283                 ts->resp = SAS_TASK_COMPLETE;
 284                 ts->stat = SAS_ABORTED_TASK;
 285                 break;
 286
 287         case TF_NO_SMP_CONN:
 288         case TF_TMF_NO_CTX:
 289         case TF_TMF_NO_TAG:
 290         case TF_TMF_TAG_FREE:
 291         case TF_TMF_TASK_DONE:
 292         case TF_TMF_NO_CONN_HANDLE:
 293         case TF_IRTT_TO:
 294         case TF_IU_SHORT:
 295         case TF_DATA_OFFS_ERR:
 296                 ts->resp = SAS_TASK_UNDELIVERED;
 297                 ts->stat = SAS_DEV_NO_RESPONSE;
 298                 break;
 299
 300         case TC_LINK_ADM_RESP:
 301         case TC_CONTROL_PHY:
 302         case TC_RESUME:
 303         case TC_PARTIAL_SG_LIST:
 304         default:
 305                 ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
 306                 break;
 307         }
 308
 309         switch (task->task_proto) {
 310         case SAS_PROTOCOL_SATA:
 311         case SAS_PROTOCOL_STP:
 312                 asd_unbuild_ata_ascb(ascb);
 313                 break;
 314         case SAS_PROTOCOL_SMP:
 315                 asd_unbuild_smp_ascb(ascb);
 316                 break;
 317         case SAS_PROTOCOL_SSP:
 318                 asd_unbuild_ssp_ascb(ascb);
 319         default:
 320                 break;
 321         }
 322
 323         spin_lock_irqsave(&task->task_state_lock, flags);
 324         task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
 325         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 326         task->task_state_flags |= SAS_TASK_STATE_DONE;
 327         if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
 328                 struct completion *completion = ascb->completion;
 329                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 330                 ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
 331                             "stat 0x%x but aborted by upper layer!\n",
 332                             task, opcode, ts->resp, ts->stat);
 333                 if (completion)
 334                         complete(completion);
 335         } else {
 336                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 337                 task->lldd_task = NULL;
 338                 asd_ascb_free(ascb);
 339                 mb();
 340                 task->task_done(task);
 341         }
 342 }
 343
 344 /* ---------- ATA ---------- */
 345
 346 static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 347                               gfp_t gfp_flags)
 348 {
 349         struct domain_device *dev = task->dev;
 350         struct scb *scb;
 351         u8     flags;
 352         int    res = 0;
 353
 354         scb = ascb->scb;
 355
 356         if (unlikely(task->ata_task.device_control_reg_update))
 357                 scb->header.opcode = CONTROL_ATA_DEV;
 358         else if (dev->sata_dev.class == ATA_DEV_ATAPI)
 359                 scb->header.opcode = INITIATE_ATAPI_TASK;
 360         else
 361                 scb->header.opcode = INITIATE_ATA_TASK;
 362
 363         scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
 364         if (dev->port->oob_mode == SAS_OOB_MODE)
 365                 scb->ata_task.proto_conn_rate |= dev->linkrate;
 366
 367         scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 368         scb->ata_task.fis = task->ata_task.fis;
 369         if (likely(!task->ata_task.device_control_reg_update))
 370                 scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
 371         scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
 372         if (dev->sata_dev.class == ATA_DEV_ATAPI)
 373                 memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
 374                        16);
 375         scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
 376         scb->ata_task.conn_handle = cpu_to_le16(
 377                 (u16)(unsigned long)dev->lldd_dev);
 378
 379         if (likely(!task->ata_task.device_control_reg_update)) {
 380                 flags = 0;
 381                 if (task->ata_task.dma_xfer)
 382                         flags |= DATA_XFER_MODE_DMA;
 383                 if (task->ata_task.use_ncq &&
 384                     dev->sata_dev.class != ATA_DEV_ATAPI)
 385                         flags |= ATA_Q_TYPE_NCQ;
 386                 flags |= data_dir_flags[task->data_dir];
 387                 scb->ata_task.ata_flags = flags;
 388
 389                 scb->ata_task.retry_count = task->ata_task.retry_count;
 390
 391                 flags = 0;
 392                 if (task->ata_task.set_affil_pol)
 393                         flags |= SET_AFFIL_POLICY;
 394                 if (task->ata_task.stp_affil_pol)
 395                         flags |= STP_AFFIL_POLICY;
 396                 scb->ata_task.flags = flags;
 397         }
 398         ascb->tasklet_complete = asd_task_tasklet_complete;
 399
 400         if (likely(!task->ata_task.device_control_reg_update))
 401                 res = asd_map_scatterlist(task, scb->ata_task.sg_element,
 402                                           gfp_flags);
 403
 404         return res;
 405 }
 406
 407 static void asd_unbuild_ata_ascb(struct asd_ascb *a)
 408 {
 409         asd_unmap_scatterlist(a);
 410 }
 411
 412 /* ---------- SMP ---------- */
 413
 414 static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 415                               gfp_t gfp_flags)
 416 {
 417         struct asd_ha_struct *asd_ha = ascb->ha;
 418         struct domain_device *dev = task->dev;
 419         struct scb *scb;
 420
 421         dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_req, 1,
 422                    DMA_TO_DEVICE);
 423         dma_map_sg(&asd_ha->pcidev->dev, &task->smp_task.smp_resp, 1,
 424                    DMA_FROM_DEVICE);
 425
 426         scb = ascb->scb;
 427
 428         scb->header.opcode = INITIATE_SMP_TASK;
 429
 430         scb->smp_task.proto_conn_rate = dev->linkrate;
 431
 432         scb->smp_task.smp_req.bus_addr =
 433                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
 434         scb->smp_task.smp_req.size =
 435                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
 436
 437         scb->smp_task.smp_resp.bus_addr =
 438                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
 439         scb->smp_task.smp_resp.size =
 440                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
 441
 442         scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
 443         scb->smp_task.conn_handle = cpu_to_le16((u16)
 444                                                 (unsigned long)dev->lldd_dev);
 445
 446         ascb->tasklet_complete = asd_task_tasklet_complete;
 447
 448         return 0;
 449 }
 450
 451 static void asd_unbuild_smp_ascb(struct asd_ascb *a)
 452 {
 453         struct sas_task *task = a->uldd_task;
 454
 455         BUG_ON(!task);
 456         dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_req, 1,
 457                      DMA_TO_DEVICE);
 458         dma_unmap_sg(&a->ha->pcidev->dev, &task->smp_task.smp_resp, 1,
 459                      DMA_FROM_DEVICE);
 460 }
 461
 462 /* ---------- SSP ---------- */
 463
 464 static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 465                               gfp_t gfp_flags)
 466 {
 467         struct domain_device *dev = task->dev;
 468         struct scb *scb;
 469         int    res = 0;
 470
 471         scb = ascb->scb;
 472
 473         scb->header.opcode = INITIATE_SSP_TASK;
 474
 475         scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
 476         scb->ssp_task.proto_conn_rate |= dev->linkrate;
 477         scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 478         scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
 479         memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
 480                HASHED_SAS_ADDR_SIZE);
 481         memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
 482                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 483         scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 484
 485         memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
 486         if (task->ssp_task.enable_first_burst)
 487                 scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
 488         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
 489         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
 490         memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
 491                task->ssp_task.cmd->cmd_len);
 492
 493         scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
 494         scb->ssp_task.conn_handle = cpu_to_le16(
 495                 (u16)(unsigned long)dev->lldd_dev);
 496         scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
 497         scb->ssp_task.retry_count = scb->ssp_task.retry_count;
 498
 499         ascb->tasklet_complete = asd_task_tasklet_complete;
 500
 501         res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
 502
 503         return res;
 504 }
 505
 506 static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
 507 {
 508         asd_unmap_scatterlist(a);
 509 }
 510
 511 /* ---------- Execute Task ---------- */
 512
 513 static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
 514 {
 515         int res = 0;
 516         unsigned long flags;
 517
 518         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
 519         if ((asd_ha->seq.can_queue - num) < 0)
 520                 res = -SAS_QUEUE_FULL;
 521         else
 522                 asd_ha->seq.can_queue -= num;
 523         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
 524
 525         return res;
 526 }
 527
 528 int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
 529 {
 530         int res = 0;
 531         LIST_HEAD(alist);
 532         struct sas_task *t = task;
 533         struct asd_ascb *ascb = NULL, *a;
 534         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 535         unsigned long flags;
 536
 537         res = asd_can_queue(asd_ha, 1);
 538         if (res)
 539                 return res;
 540
 541         res = 1;
 542         ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
 543         if (res) {
 544                 res = -ENOMEM;
 545                 goto out_err;
 546         }
 547
 548         __list_add(&alist, ascb->list.prev, &ascb->list);
 549         list_for_each_entry(a, &alist, list) {
 550                 a->uldd_task = t;
 551                 t->lldd_task = a;
 552                 break;
 553         }
 554         list_for_each_entry(a, &alist, list) {
 555                 t = a->uldd_task;
 556                 a->uldd_timer = 1;
 557                 if (t->task_proto & SAS_PROTOCOL_STP)
 558                         t->task_proto = SAS_PROTOCOL_STP;
 559                 switch (t->task_proto) {
 560                 case SAS_PROTOCOL_SATA:
 561                 case SAS_PROTOCOL_STP:
 562                         res = asd_build_ata_ascb(a, t, gfp_flags);
 563                         break;
 564                 case SAS_PROTOCOL_SMP:
 565                         res = asd_build_smp_ascb(a, t, gfp_flags);
 566                         break;
 567                 case SAS_PROTOCOL_SSP:
 568                         res = asd_build_ssp_ascb(a, t, gfp_flags);
 569                         break;
 570                 default:
 571                         asd_printk("unknown sas_task proto: 0x%x\n",
 572                                    t->task_proto);
 573                         res = -ENOMEM;
 574                         break;
 575                 }
 576                 if (res)
 577                         goto out_err_unmap;
 578
 579                 spin_lock_irqsave(&t->task_state_lock, flags);
 580                 t->task_state_flags |= SAS_TASK_AT_INITIATOR;
 581                 spin_unlock_irqrestore(&t->task_state_lock, flags);
 582         }
 583         list_del_init(&alist);
 584
 585         res = asd_post_ascb_list(asd_ha, ascb, 1);
 586         if (unlikely(res)) {
 587                 a = NULL;
 588                 __list_add(&alist, ascb->list.prev, &ascb->list);
 589                 goto out_err_unmap;
 590         }
 591
 592         return 0;
 593 out_err_unmap:
 594         {
 595                 struct asd_ascb *b = a;
 596                 list_for_each_entry(a, &alist, list) {
 597                         if (a == b)
 598                                 break;
 599                         t = a->uldd_task;
 600                         spin_lock_irqsave(&t->task_state_lock, flags);
 601                         t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 602                         spin_unlock_irqrestore(&t->task_state_lock, flags);
 603                         switch (t->task_proto) {
 604                         case SAS_PROTOCOL_SATA:
 605                         case SAS_PROTOCOL_STP:
 606                                 asd_unbuild_ata_ascb(a);
 607                                 break;
 608                         case SAS_PROTOCOL_SMP:
 609                                 asd_unbuild_smp_ascb(a);
 610                                 break;
 611                         case SAS_PROTOCOL_SSP:
 612                                 asd_unbuild_ssp_ascb(a);
 613                         default:
 614                                 break;
 615                         }
 616                         t->lldd_task = NULL;
 617                 }
 618         }
 619         list_del_init(&alist);
 620 out_err:
 621         if (ascb)
 622                 asd_ascb_free_list(ascb);
 623         asd_can_dequeue(asd_ha, 1);
 624         return res;
 625 }