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