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