drivers/scsi/aic94xx/aic94xx_task.c

   1 /*
   2  * Aic94xx SAS/SATA Tasks
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This file is part of the aic94xx driver.
  10  *
  11  * The aic94xx driver is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; version 2 of the
  14  * License.
  15  *
  16  * The aic94xx driver is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with the aic94xx driver; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  *
  25  */
  26
  27 #include <linux/spinlock.h>
  28 #include "aic94xx.h"
  29 #include "aic94xx_sas.h"
  30 #include "aic94xx_hwi.h"
  31
  32 static void asd_unbuild_ata_ascb(struct asd_ascb *a);
  33 static void asd_unbuild_smp_ascb(struct asd_ascb *a);
  34 static void asd_unbuild_ssp_ascb(struct asd_ascb *a);
  35
  36 static inline void asd_can_dequeue(struct asd_ha_struct *asd_ha, int num)
  37 {
  38         unsigned long flags;
  39
  40         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
  41         asd_ha->seq.can_queue += num;
  42         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
  43 }
  44
  45 /* PCI_DMA_... to our direction translation.
  46  */
  47 static const u8 data_dir_flags[] = {
  48         [PCI_DMA_BIDIRECTIONAL] = DATA_DIR_BYRECIPIENT, /* UNSPECIFIED */
  49         [PCI_DMA_TODEVICE]      = DATA_DIR_OUT, /* OUTBOUND */
  50         [PCI_DMA_FROMDEVICE]    = DATA_DIR_IN, /* INBOUND */
  51         [PCI_DMA_NONE]          = DATA_DIR_NONE, /* NO TRANSFER */
  52 };
  53
  54 static inline int asd_map_scatterlist(struct sas_task *task,
  55                                       struct sg_el *sg_arr,
  56                                       gfp_t gfp_flags)
  57 {
  58         struct asd_ascb *ascb = task->lldd_task;
  59         struct asd_ha_struct *asd_ha = ascb->ha;
  60         struct scatterlist *sc;
  61         int num_sg, res;
  62
  63         if (task->data_dir == PCI_DMA_NONE)
  64                 return 0;
  65
  66         if (task->num_scatter == 0) {
  67                 void *p = task->scatter;
  68                 dma_addr_t dma = pci_map_single(asd_ha->pcidev, p,
  69                                                 task->total_xfer_len,
  70                                                 task->data_dir);
  71                 sg_arr[0].bus_addr = cpu_to_le64((u64)dma);
  72                 sg_arr[0].size = cpu_to_le32(task->total_xfer_len);
  73                 sg_arr[0].flags |= ASD_SG_EL_LIST_EOL;
  74                 return 0;
  75         }
  76
  77         /* STP tasks come from libata which has already mapped
  78          * the SG list */
  79         if (sas_protocol_ata(task->task_proto))
  80                 num_sg = task->num_scatter;
  81         else
  82                 num_sg = pci_map_sg(asd_ha->pcidev, task->scatter,
  83                                     task->num_scatter, task->data_dir);
  84         if (num_sg == 0)
  85                 return -ENOMEM;
  86
  87         if (num_sg > 3) {
  88                 int i;
  89
  90                 ascb->sg_arr = asd_alloc_coherent(asd_ha,
  91                                                   num_sg*sizeof(struct sg_el),
  92                                                   gfp_flags);
  93                 if (!ascb->sg_arr) {
  94                         res = -ENOMEM;
  95                         goto err_unmap;
  96                 }
  97                 for_each_sg(task->scatter, sc, num_sg, i) {
  98                         struct sg_el *sg =
  99                                 &((struct sg_el *)ascb->sg_arr->vaddr)[i];
 100                         sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
 101                         sg->size = cpu_to_le32((u32)sg_dma_len(sc));
 102                         if (i == num_sg-1)
 103                                 sg->flags |= ASD_SG_EL_LIST_EOL;
 104                 }
 105
 106                 for_each_sg(task->scatter, sc, 2, i) {
 107                         sg_arr[i].bus_addr =
 108                                 cpu_to_le64((u64)sg_dma_address(sc));
 109                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
 110                 }
 111                 sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
 112                 sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;
 113
 114                 memset(&sg_arr[2], 0, sizeof(*sg_arr));
 115                 sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
 116         } else {
 117                 int i;
 118                 for_each_sg(task->scatter, sc, num_sg, i) {
 119                         sg_arr[i].bus_addr =
 120                                 cpu_to_le64((u64)sg_dma_address(sc));
 121                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
 122                 }
 123                 sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
 124         }
 125
 126         return 0;
 127 err_unmap:
 128         if (sas_protocol_ata(task->task_proto))
 129                 pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
 130                              task->data_dir);
 131         return res;
 132 }
 133
 134 static inline void asd_unmap_scatterlist(struct asd_ascb *ascb)
 135 {
 136         struct asd_ha_struct *asd_ha = ascb->ha;
 137         struct sas_task *task = ascb->uldd_task;
 138
 139         if (task->data_dir == PCI_DMA_NONE)
 140                 return;
 141
 142         if (task->num_scatter == 0) {
 143                 dma_addr_t dma = (dma_addr_t)
 144                        le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
 145                 pci_unmap_single(ascb->ha->pcidev, dma, task->total_xfer_len,
 146                                  task->data_dir);
 147                 return;
 148         }
 149
 150         asd_free_coherent(asd_ha, ascb->sg_arr);
 151         if (task->task_proto != SAS_PROTOCOL_STP)
 152                 pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
 153                              task->data_dir);
 154 }
 155
 156 /* ---------- Task complete tasklet ---------- */
 157
 158 static void asd_get_response_tasklet(struct asd_ascb *ascb,
 159                                      struct done_list_struct *dl)
 160 {
 161         struct asd_ha_struct *asd_ha = ascb->ha;
 162         struct sas_task *task = ascb->uldd_task;
 163         struct task_status_struct *ts = &task->task_status;
 164         unsigned long flags;
 165         struct tc_resp_sb_struct {
 166                 __le16 index_escb;
 167                 u8     len_lsb;
 168                 u8     flags;
 169         } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 170
 171 /*      int  size   = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
 172         int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 173         struct asd_ascb *escb;
 174         struct asd_dma_tok *edb;
 175         void *r;
 176
 177         spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 178         escb = asd_tc_index_find(&asd_ha->seq,
 179                                  (int)le16_to_cpu(resp_sb->index_escb));
 180         spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 181
 182         if (!escb) {
 183                 ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 184                 return;
 185         }
 186
 187         ts->buf_valid_size = 0;
 188         edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 189         r = edb->vaddr;
 190         if (task->task_proto == SAS_PROTO_SSP) {
 191                 struct ssp_response_iu *iu =
 192                         r + 16 + sizeof(struct ssp_frame_hdr);
 193
 194                 ts->residual = le32_to_cpu(*(__le32 *)r);
 195                 ts->resp = SAS_TASK_COMPLETE;
 196                 if (iu->datapres == 0)
 197                         ts->stat = iu->status;
 198                 else if (iu->datapres == 1)
 199                         ts->stat = iu->resp_data[3];
 200                 else if (iu->datapres == 2) {
 201                         ts->stat = SAM_CHECK_COND;
 202                         ts->buf_valid_size = min((u32) SAS_STATUS_BUF_SIZE,
 203                                          be32_to_cpu(iu->sense_data_len));
 204                         memcpy(ts->buf, iu->sense_data, ts->buf_valid_size);
 205                         if (iu->status != SAM_CHECK_COND) {
 206                                 ASD_DPRINTK("device %llx sent sense data, but "
 207                                             "stat(0x%x) is not CHECK_CONDITION"
 208                                             "\n",
 209                                             SAS_ADDR(task->dev->sas_addr),
 210                                             iu->status);
 211                         }
 212                 }
 213         }  else {
 214                 struct ata_task_resp *resp = (void *) &ts->buf[0];
 215
 216                 ts->residual = le32_to_cpu(*(__le32 *)r);
 217
 218                 if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
 219                         resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
 220                         memcpy(&resp->ending_fis[0], r+16, 24);
 221                         ts->buf_valid_size = sizeof(*resp);
 222                 }
 223         }
 224
 225         asd_invalidate_edb(escb, edb_id);
 226 }
 227
 228 static void asd_task_tasklet_complete(struct asd_ascb *ascb,
 229                                       struct done_list_struct *dl)
 230 {
 231         struct sas_task *task = ascb->uldd_task;
 232         struct task_status_struct *ts = &task->task_status;
 233         unsigned long flags;
 234         u8 opcode = dl->opcode;
 235
 236         asd_can_dequeue(ascb->ha, 1);
 237
 238 Again:
 239         switch (opcode) {
 240         case TC_NO_ERROR:
 241                 ts->resp = SAS_TASK_COMPLETE;
 242                 ts->stat = SAM_GOOD;
 243                 break;
 244         case TC_UNDERRUN:
 245                 ts->resp = SAS_TASK_COMPLETE;
 246                 ts->stat = SAS_DATA_UNDERRUN;
 247                 ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
 248                 break;
 249         case TC_OVERRUN:
 250                 ts->resp = SAS_TASK_COMPLETE;
 251                 ts->stat = SAS_DATA_OVERRUN;
 252                 ts->residual = 0;
 253                 break;
 254         case TC_SSP_RESP:
 255         case TC_ATA_RESP:
 256                 ts->resp = SAS_TASK_COMPLETE;
 257                 ts->stat = SAS_PROTO_RESPONSE;
 258                 asd_get_response_tasklet(ascb, dl);
 259                 break;
 260         case TF_OPEN_REJECT:
 261                 ts->resp = SAS_TASK_UNDELIVERED;
 262                 ts->stat = SAS_OPEN_REJECT;
 263                 if (dl->status_block[1] & 2)
 264                         ts->open_rej_reason = 1 + dl->status_block[2];
 265                 else if (dl->status_block[1] & 1)
 266                         ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
 267                 else
 268                         ts->open_rej_reason = SAS_OREJ_UNKNOWN;
 269                 break;
 270         case TF_OPEN_TO:
 271                 ts->resp = SAS_TASK_UNDELIVERED;
 272                 ts->stat = SAS_OPEN_TO;
 273                 break;
 274         case TF_PHY_DOWN:
 275         case TU_PHY_DOWN:
 276                 ts->resp = SAS_TASK_UNDELIVERED;
 277                 ts->stat = SAS_PHY_DOWN;
 278                 break;
 279         case TI_PHY_DOWN:
 280                 ts->resp = SAS_TASK_COMPLETE;
 281                 ts->stat = SAS_PHY_DOWN;
 282                 break;
 283         case TI_BREAK:
 284         case TI_PROTO_ERR:
 285         case TI_NAK:
 286         case TI_ACK_NAK_TO:
 287         case TF_SMP_XMIT_RCV_ERR:
 288         case TC_ATA_R_ERR_RECV:
 289                 ts->resp = SAS_TASK_COMPLETE;
 290                 ts->stat = SAS_INTERRUPTED;
 291                 break;
 292         case TF_BREAK:
 293         case TU_BREAK:
 294         case TU_ACK_NAK_TO:
 295         case TF_SMPRSP_TO:
 296                 ts->resp = SAS_TASK_UNDELIVERED;
 297                 ts->stat = SAS_DEV_NO_RESPONSE;
 298                 break;
 299         case TF_NAK_RECV:
 300                 ts->resp = SAS_TASK_COMPLETE;
 301                 ts->stat = SAS_NAK_R_ERR;
 302                 break;
 303         case TA_I_T_NEXUS_LOSS:
 304                 opcode = dl->status_block[0];
 305                 goto Again;
 306                 break;
 307         case TF_INV_CONN_HANDLE:
 308                 ts->resp = SAS_TASK_UNDELIVERED;
 309                 ts->stat = SAS_DEVICE_UNKNOWN;
 310                 break;
 311         case TF_REQUESTED_N_PENDING:
 312                 ts->resp = SAS_TASK_UNDELIVERED;
 313                 ts->stat = SAS_PENDING;
 314                 break;
 315         case TC_TASK_CLEARED:
 316         case TA_ON_REQ:
 317                 ts->resp = SAS_TASK_COMPLETE;
 318                 ts->stat = SAS_ABORTED_TASK;
 319                 break;
 320
 321         case TF_NO_SMP_CONN:
 322         case TF_TMF_NO_CTX:
 323         case TF_TMF_NO_TAG:
 324         case TF_TMF_TAG_FREE:
 325         case TF_TMF_TASK_DONE:
 326         case TF_TMF_NO_CONN_HANDLE:
 327         case TF_IRTT_TO:
 328         case TF_IU_SHORT:
 329         case TF_DATA_OFFS_ERR:
 330                 ts->resp = SAS_TASK_UNDELIVERED;
 331                 ts->stat = SAS_DEV_NO_RESPONSE;
 332                 break;
 333
 334         case TC_LINK_ADM_RESP:
 335         case TC_CONTROL_PHY:
 336         case TC_RESUME:
 337         case TC_PARTIAL_SG_LIST:
 338         default:
 339                 ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __FUNCTION__, opcode);
 340                 break;
 341         }
 342
 343         switch (task->task_proto) {
 344         case SATA_PROTO:
 345         case SAS_PROTO_STP:
 346                 asd_unbuild_ata_ascb(ascb);
 347                 break;
 348         case SAS_PROTO_SMP:
 349                 asd_unbuild_smp_ascb(ascb);
 350                 break;
 351         case SAS_PROTO_SSP:
 352                 asd_unbuild_ssp_ascb(ascb);
 353         default:
 354                 break;
 355         }
 356
 357         spin_lock_irqsave(&task->task_state_lock, flags);
 358         task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
 359         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 360         task->task_state_flags |= SAS_TASK_STATE_DONE;
 361         if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
 362                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 363                 ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
 364                             "stat 0x%x but aborted by upper layer!\n",
 365                             task, opcode, ts->resp, ts->stat);
 366                 complete(&ascb->completion);
 367         } else {
 368                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 369                 task->lldd_task = NULL;
 370                 asd_ascb_free(ascb);
 371                 mb();
 372                 task->task_done(task);
 373         }
 374 }
 375
 376 /* ---------- ATA ---------- */
 377
 378 static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 379                               gfp_t gfp_flags)
 380 {
 381         struct domain_device *dev = task->dev;
 382         struct scb *scb;
 383         u8     flags;
 384         int    res = 0;
 385
 386         scb = ascb->scb;
 387
 388         if (unlikely(task->ata_task.device_control_reg_update))
 389                 scb->header.opcode = CONTROL_ATA_DEV;
 390         else if (dev->sata_dev.command_set == ATA_COMMAND_SET)
 391                 scb->header.opcode = INITIATE_ATA_TASK;
 392         else
 393                 scb->header.opcode = INITIATE_ATAPI_TASK;
 394
 395         scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
 396         if (dev->port->oob_mode == SAS_OOB_MODE)
 397                 scb->ata_task.proto_conn_rate |= dev->linkrate;
 398
 399         scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 400         scb->ata_task.fis = task->ata_task.fis;
 401         if (likely(!task->ata_task.device_control_reg_update))
 402                 scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
 403         scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
 404         if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
 405                 memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
 406                        16);
 407         scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
 408         scb->ata_task.conn_handle = cpu_to_le16(
 409                 (u16)(unsigned long)dev->lldd_dev);
 410
 411         if (likely(!task->ata_task.device_control_reg_update)) {
 412                 flags = 0;
 413                 if (task->ata_task.dma_xfer)
 414                         flags |= DATA_XFER_MODE_DMA;
 415                 if (task->ata_task.use_ncq &&
 416                     dev->sata_dev.command_set != ATAPI_COMMAND_SET)
 417                         flags |= ATA_Q_TYPE_NCQ;
 418                 flags |= data_dir_flags[task->data_dir];
 419                 scb->ata_task.ata_flags = flags;
 420
 421                 scb->ata_task.retry_count = task->ata_task.retry_count;
 422
 423                 flags = 0;
 424                 if (task->ata_task.set_affil_pol)
 425                         flags |= SET_AFFIL_POLICY;
 426                 if (task->ata_task.stp_affil_pol)
 427                         flags |= STP_AFFIL_POLICY;
 428                 scb->ata_task.flags = flags;
 429         }
 430         ascb->tasklet_complete = asd_task_tasklet_complete;
 431
 432         if (likely(!task->ata_task.device_control_reg_update))
 433                 res = asd_map_scatterlist(task, scb->ata_task.sg_element,
 434                                           gfp_flags);
 435
 436         return res;
 437 }
 438
 439 static void asd_unbuild_ata_ascb(struct asd_ascb *a)
 440 {
 441         asd_unmap_scatterlist(a);
 442 }
 443
 444 /* ---------- SMP ---------- */
 445
 446 static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 447                               gfp_t gfp_flags)
 448 {
 449         struct asd_ha_struct *asd_ha = ascb->ha;
 450         struct domain_device *dev = task->dev;
 451         struct scb *scb;
 452
 453         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
 454                    PCI_DMA_TODEVICE);
 455         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
 456                    PCI_DMA_FROMDEVICE);
 457
 458         scb = ascb->scb;
 459
 460         scb->header.opcode = INITIATE_SMP_TASK;
 461
 462         scb->smp_task.proto_conn_rate = dev->linkrate;
 463
 464         scb->smp_task.smp_req.bus_addr =
 465                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
 466         scb->smp_task.smp_req.size =
 467                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
 468
 469         scb->smp_task.smp_resp.bus_addr =
 470                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
 471         scb->smp_task.smp_resp.size =
 472                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
 473
 474         scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
 475         scb->smp_task.conn_handle = cpu_to_le16((u16)
 476                                                 (unsigned long)dev->lldd_dev);
 477
 478         ascb->tasklet_complete = asd_task_tasklet_complete;
 479
 480         return 0;
 481 }
 482
 483 static void asd_unbuild_smp_ascb(struct asd_ascb *a)
 484 {
 485         struct sas_task *task = a->uldd_task;
 486
 487         BUG_ON(!task);
 488         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
 489                      PCI_DMA_TODEVICE);
 490         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
 491                      PCI_DMA_FROMDEVICE);
 492 }
 493
 494 /* ---------- SSP ---------- */
 495
 496 static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 497                               gfp_t gfp_flags)
 498 {
 499         struct domain_device *dev = task->dev;
 500         struct scb *scb;
 501         int    res = 0;
 502
 503         scb = ascb->scb;
 504
 505         scb->header.opcode = INITIATE_SSP_TASK;
 506
 507         scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
 508         scb->ssp_task.proto_conn_rate |= dev->linkrate;
 509         scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 510         scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
 511         memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
 512                HASHED_SAS_ADDR_SIZE);
 513         memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
 514                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 515         scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 516
 517         memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
 518         if (task->ssp_task.enable_first_burst)
 519                 scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
 520         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
 521         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
 522         memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cdb, 16);
 523
 524         scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
 525         scb->ssp_task.conn_handle = cpu_to_le16(
 526                 (u16)(unsigned long)dev->lldd_dev);
 527         scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
 528         scb->ssp_task.retry_count = scb->ssp_task.retry_count;
 529
 530         ascb->tasklet_complete = asd_task_tasklet_complete;
 531
 532         res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
 533
 534         return res;
 535 }
 536
 537 static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
 538 {
 539         asd_unmap_scatterlist(a);
 540 }
 541
 542 /* ---------- Execute Task ---------- */
 543
 544 static inline int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
 545 {
 546         int res = 0;
 547         unsigned long flags;
 548
 549         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
 550         if ((asd_ha->seq.can_queue - num) < 0)
 551                 res = -SAS_QUEUE_FULL;
 552         else
 553                 asd_ha->seq.can_queue -= num;
 554         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
 555
 556         return res;
 557 }
 558
 559 int asd_execute_task(struct sas_task *task, const int num,
 560                      gfp_t gfp_flags)
 561 {
 562         int res = 0;
 563         LIST_HEAD(alist);
 564         struct sas_task *t = task;
 565         struct asd_ascb *ascb = NULL, *a;
 566         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 567         unsigned long flags;
 568
 569         res = asd_can_queue(asd_ha, num);
 570         if (res)
 571                 return res;
 572
 573         res = num;
 574         ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
 575         if (res) {
 576                 res = -ENOMEM;
 577                 goto out_err;
 578         }
 579
 580         __list_add(&alist, ascb->list.prev, &ascb->list);
 581         list_for_each_entry(a, &alist, list) {
 582                 a->uldd_task = t;
 583                 t->lldd_task = a;
 584                 t = list_entry(t->list.next, struct sas_task, list);
 585         }
 586         list_for_each_entry(a, &alist, list) {
 587                 t = a->uldd_task;
 588                 a->uldd_timer = 1;
 589                 if (t->task_proto & SAS_PROTO_STP)
 590                         t->task_proto = SAS_PROTO_STP;
 591                 switch (t->task_proto) {
 592                 case SATA_PROTO:
 593                 case SAS_PROTO_STP:
 594                         res = asd_build_ata_ascb(a, t, gfp_flags);
 595                         break;
 596                 case SAS_PROTO_SMP:
 597                         res = asd_build_smp_ascb(a, t, gfp_flags);
 598                         break;
 599                 case SAS_PROTO_SSP:
 600                         res = asd_build_ssp_ascb(a, t, gfp_flags);
 601                         break;
 602                 default:
 603                         asd_printk("unknown sas_task proto: 0x%x\n",
 604                                    t->task_proto);
 605                         res = -ENOMEM;
 606                         break;
 607                 }
 608                 if (res)
 609                         goto out_err_unmap;
 610
 611                 spin_lock_irqsave(&t->task_state_lock, flags);
 612                 t->task_state_flags |= SAS_TASK_AT_INITIATOR;
 613                 spin_unlock_irqrestore(&t->task_state_lock, flags);
 614         }
 615         list_del_init(&alist);
 616
 617         res = asd_post_ascb_list(asd_ha, ascb, num);
 618         if (unlikely(res)) {
 619                 a = NULL;
 620                 __list_add(&alist, ascb->list.prev, &ascb->list);
 621                 goto out_err_unmap;
 622         }
 623
 624         return 0;
 625 out_err_unmap:
 626         {
 627                 struct asd_ascb *b = a;
 628                 list_for_each_entry(a, &alist, list) {
 629                         if (a == b)
 630                                 break;
 631                         t = a->uldd_task;
 632                         spin_lock_irqsave(&t->task_state_lock, flags);
 633                         t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 634                         spin_unlock_irqrestore(&t->task_state_lock, flags);
 635                         switch (t->task_proto) {
 636                         case SATA_PROTO:
 637                         case SAS_PROTO_STP:
 638                                 asd_unbuild_ata_ascb(a);
 639                                 break;
 640                         case SAS_PROTO_SMP:
 641                                 asd_unbuild_smp_ascb(a);
 642                                 break;
 643                         case SAS_PROTO_SSP:
 644                                 asd_unbuild_ssp_ascb(a);
 645                         default:
 646                                 break;
 647                         }
 648                         t->lldd_task = NULL;
 649                 }
 650         }
 651         list_del_init(&alist);
 652 out_err:
 653         if (ascb)
 654                 asd_ascb_free_list(ascb);
 655         asd_can_dequeue(asd_ha, num);
 656         return res;
 657 }