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                 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 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_PROTOCOL_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
 196                 sas_ssp_task_response(&asd_ha->pcidev->dev, task, iu);
 197         }  else {
 198                 struct ata_task_resp *resp = (void *) &ts->buf[0];
 199
 200                 ts->residual = le32_to_cpu(*(__le32 *)r);
 201
 202                 if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
 203                         resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
 204                         memcpy(&resp->ending_fis[0], r+16, ATA_RESP_FIS_SIZE);
 205                         ts->buf_valid_size = sizeof(*resp);
 206                 }
 207         }
 208
 209         asd_invalidate_edb(escb, edb_id);
 210 }
 211
 212 static void asd_task_tasklet_complete(struct asd_ascb *ascb,
 213                                       struct done_list_struct *dl)
 214 {
 215         struct sas_task *task = ascb->uldd_task;
 216         struct task_status_struct *ts = &task->task_status;
 217         unsigned long flags;
 218         u8 opcode = dl->opcode;
 219
 220         asd_can_dequeue(ascb->ha, 1);
 221
 222 Again:
 223         switch (opcode) {
 224         case TC_NO_ERROR:
 225                 ts->resp = SAS_TASK_COMPLETE;
 226                 ts->stat = SAM_STAT_GOOD;
 227                 break;
 228         case TC_UNDERRUN:
 229                 ts->resp = SAS_TASK_COMPLETE;
 230                 ts->stat = SAS_DATA_UNDERRUN;
 231                 ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
 232                 break;
 233         case TC_OVERRUN:
 234                 ts->resp = SAS_TASK_COMPLETE;
 235                 ts->stat = SAS_DATA_OVERRUN;
 236                 ts->residual = 0;
 237                 break;
 238         case TC_SSP_RESP:
 239         case TC_ATA_RESP:
 240                 ts->resp = SAS_TASK_COMPLETE;
 241                 ts->stat = SAS_PROTO_RESPONSE;
 242                 asd_get_response_tasklet(ascb, dl);
 243                 break;
 244         case TF_OPEN_REJECT:
 245                 ts->resp = SAS_TASK_UNDELIVERED;
 246                 ts->stat = SAS_OPEN_REJECT;
 247                 if (dl->status_block[1] & 2)
 248                         ts->open_rej_reason = 1 + dl->status_block[2];
 249                 else if (dl->status_block[1] & 1)
 250                         ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
 251                 else
 252                         ts->open_rej_reason = SAS_OREJ_UNKNOWN;
 253                 break;
 254         case TF_OPEN_TO:
 255                 ts->resp = SAS_TASK_UNDELIVERED;
 256                 ts->stat = SAS_OPEN_TO;
 257                 break;
 258         case TF_PHY_DOWN:
 259         case TU_PHY_DOWN:
 260                 ts->resp = SAS_TASK_UNDELIVERED;
 261                 ts->stat = SAS_PHY_DOWN;
 262                 break;
 263         case TI_PHY_DOWN:
 264                 ts->resp = SAS_TASK_COMPLETE;
 265                 ts->stat = SAS_PHY_DOWN;
 266                 break;
 267         case TI_BREAK:
 268         case TI_PROTO_ERR:
 269         case TI_NAK:
 270         case TI_ACK_NAK_TO:
 271         case TF_SMP_XMIT_RCV_ERR:
 272         case TC_ATA_R_ERR_RECV:
 273                 ts->resp = SAS_TASK_COMPLETE;
 274                 ts->stat = SAS_INTERRUPTED;
 275                 break;
 276         case TF_BREAK:
 277         case TU_BREAK:
 278         case TU_ACK_NAK_TO:
 279         case TF_SMPRSP_TO:
 280                 ts->resp = SAS_TASK_UNDELIVERED;
 281                 ts->stat = SAS_DEV_NO_RESPONSE;
 282                 break;
 283         case TF_NAK_RECV:
 284                 ts->resp = SAS_TASK_COMPLETE;
 285                 ts->stat = SAS_NAK_R_ERR;
 286                 break;
 287         case TA_I_T_NEXUS_LOSS:
 288                 opcode = dl->status_block[0];
 289                 goto Again;
 290                 break;
 291         case TF_INV_CONN_HANDLE:
 292                 ts->resp = SAS_TASK_UNDELIVERED;
 293                 ts->stat = SAS_DEVICE_UNKNOWN;
 294                 break;
 295         case TF_REQUESTED_N_PENDING:
 296                 ts->resp = SAS_TASK_UNDELIVERED;
 297                 ts->stat = SAS_PENDING;
 298                 break;
 299         case TC_TASK_CLEARED:
 300         case TA_ON_REQ:
 301                 ts->resp = SAS_TASK_COMPLETE;
 302                 ts->stat = SAS_ABORTED_TASK;
 303                 break;
 304
 305         case TF_NO_SMP_CONN:
 306         case TF_TMF_NO_CTX:
 307         case TF_TMF_NO_TAG:
 308         case TF_TMF_TAG_FREE:
 309         case TF_TMF_TASK_DONE:
 310         case TF_TMF_NO_CONN_HANDLE:
 311         case TF_IRTT_TO:
 312         case TF_IU_SHORT:
 313         case TF_DATA_OFFS_ERR:
 314                 ts->resp = SAS_TASK_UNDELIVERED;
 315                 ts->stat = SAS_DEV_NO_RESPONSE;
 316                 break;
 317
 318         case TC_LINK_ADM_RESP:
 319         case TC_CONTROL_PHY:
 320         case TC_RESUME:
 321         case TC_PARTIAL_SG_LIST:
 322         default:
 323                 ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __func__, opcode);
 324                 break;
 325         }
 326
 327         switch (task->task_proto) {
 328         case SAS_PROTOCOL_SATA:
 329         case SAS_PROTOCOL_STP:
 330                 asd_unbuild_ata_ascb(ascb);
 331                 break;
 332         case SAS_PROTOCOL_SMP:
 333                 asd_unbuild_smp_ascb(ascb);
 334                 break;
 335         case SAS_PROTOCOL_SSP:
 336                 asd_unbuild_ssp_ascb(ascb);
 337         default:
 338                 break;
 339         }
 340
 341         spin_lock_irqsave(&task->task_state_lock, flags);
 342         task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
 343         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 344         task->task_state_flags |= SAS_TASK_STATE_DONE;
 345         if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
 346                 struct completion *completion = ascb->completion;
 347                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 348                 ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
 349                             "stat 0x%x but aborted by upper layer!\n",
 350                             task, opcode, ts->resp, ts->stat);
 351                 if (completion)
 352                         complete(completion);
 353         } else {
 354                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 355                 task->lldd_task = NULL;
 356                 asd_ascb_free(ascb);
 357                 mb();
 358                 task->task_done(task);
 359         }
 360 }
 361
 362 /* ---------- ATA ---------- */
 363
 364 static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 365                               gfp_t gfp_flags)
 366 {
 367         struct domain_device *dev = task->dev;
 368         struct scb *scb;
 369         u8     flags;
 370         int    res = 0;
 371
 372         scb = ascb->scb;
 373
 374         if (unlikely(task->ata_task.device_control_reg_update))
 375                 scb->header.opcode = CONTROL_ATA_DEV;
 376         else if (dev->sata_dev.class == ATA_DEV_ATAPI)
 377                 scb->header.opcode = INITIATE_ATAPI_TASK;
 378         else
 379                 scb->header.opcode = INITIATE_ATA_TASK;
 380
 381         scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
 382         if (dev->port->oob_mode == SAS_OOB_MODE)
 383                 scb->ata_task.proto_conn_rate |= dev->linkrate;
 384
 385         scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 386         scb->ata_task.fis = task->ata_task.fis;
 387         if (likely(!task->ata_task.device_control_reg_update))
 388                 scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
 389         scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
 390         if (dev->sata_dev.class == ATA_DEV_ATAPI)
 391                 memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
 392                        16);
 393         scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
 394         scb->ata_task.conn_handle = cpu_to_le16(
 395                 (u16)(unsigned long)dev->lldd_dev);
 396
 397         if (likely(!task->ata_task.device_control_reg_update)) {
 398                 flags = 0;
 399                 if (task->ata_task.dma_xfer)
 400                         flags |= DATA_XFER_MODE_DMA;
 401                 if (task->ata_task.use_ncq &&
 402                     dev->sata_dev.class != ATA_DEV_ATAPI)
 403                         flags |= ATA_Q_TYPE_NCQ;
 404                 flags |= data_dir_flags[task->data_dir];
 405                 scb->ata_task.ata_flags = flags;
 406
 407                 scb->ata_task.retry_count = task->ata_task.retry_count;
 408
 409                 flags = 0;
 410                 if (task->ata_task.set_affil_pol)
 411                         flags |= SET_AFFIL_POLICY;
 412                 if (task->ata_task.stp_affil_pol)
 413                         flags |= STP_AFFIL_POLICY;
 414                 scb->ata_task.flags = flags;
 415         }
 416         ascb->tasklet_complete = asd_task_tasklet_complete;
 417
 418         if (likely(!task->ata_task.device_control_reg_update))
 419                 res = asd_map_scatterlist(task, scb->ata_task.sg_element,
 420                                           gfp_flags);
 421
 422         return res;
 423 }
 424
 425 static void asd_unbuild_ata_ascb(struct asd_ascb *a)
 426 {
 427         asd_unmap_scatterlist(a);
 428 }
 429
 430 /* ---------- SMP ---------- */
 431
 432 static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 433                               gfp_t gfp_flags)
 434 {
 435         struct asd_ha_struct *asd_ha = ascb->ha;
 436         struct domain_device *dev = task->dev;
 437         struct scb *scb;
 438
 439         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
 440                    PCI_DMA_TODEVICE);
 441         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
 442                    PCI_DMA_FROMDEVICE);
 443
 444         scb = ascb->scb;
 445
 446         scb->header.opcode = INITIATE_SMP_TASK;
 447
 448         scb->smp_task.proto_conn_rate = dev->linkrate;
 449
 450         scb->smp_task.smp_req.bus_addr =
 451                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
 452         scb->smp_task.smp_req.size =
 453                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
 454
 455         scb->smp_task.smp_resp.bus_addr =
 456                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
 457         scb->smp_task.smp_resp.size =
 458                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
 459
 460         scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
 461         scb->smp_task.conn_handle = cpu_to_le16((u16)
 462                                                 (unsigned long)dev->lldd_dev);
 463
 464         ascb->tasklet_complete = asd_task_tasklet_complete;
 465
 466         return 0;
 467 }
 468
 469 static void asd_unbuild_smp_ascb(struct asd_ascb *a)
 470 {
 471         struct sas_task *task = a->uldd_task;
 472
 473         BUG_ON(!task);
 474         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
 475                      PCI_DMA_TODEVICE);
 476         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
 477                      PCI_DMA_FROMDEVICE);
 478 }
 479
 480 /* ---------- SSP ---------- */
 481
 482 static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 483                               gfp_t gfp_flags)
 484 {
 485         struct domain_device *dev = task->dev;
 486         struct scb *scb;
 487         int    res = 0;
 488
 489         scb = ascb->scb;
 490
 491         scb->header.opcode = INITIATE_SSP_TASK;
 492
 493         scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
 494         scb->ssp_task.proto_conn_rate |= dev->linkrate;
 495         scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 496         scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
 497         memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
 498                HASHED_SAS_ADDR_SIZE);
 499         memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
 500                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 501         scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 502
 503         memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
 504         if (task->ssp_task.enable_first_burst)
 505                 scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
 506         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
 507         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
 508         memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cmd->cmnd,
 509                task->ssp_task.cmd->cmd_len);
 510
 511         scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
 512         scb->ssp_task.conn_handle = cpu_to_le16(
 513                 (u16)(unsigned long)dev->lldd_dev);
 514         scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
 515         scb->ssp_task.retry_count = scb->ssp_task.retry_count;
 516
 517         ascb->tasklet_complete = asd_task_tasklet_complete;
 518
 519         res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
 520
 521         return res;
 522 }
 523
 524 static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
 525 {
 526         asd_unmap_scatterlist(a);
 527 }
 528
 529 /* ---------- Execute Task ---------- */
 530
 531 static int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
 532 {
 533         int res = 0;
 534         unsigned long flags;
 535
 536         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
 537         if ((asd_ha->seq.can_queue - num) < 0)
 538                 res = -SAS_QUEUE_FULL;
 539         else
 540                 asd_ha->seq.can_queue -= num;
 541         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
 542
 543         return res;
 544 }
 545
 546 int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
 547 {
 548         int res = 0;
 549         LIST_HEAD(alist);
 550         struct sas_task *t = task;
 551         struct asd_ascb *ascb = NULL, *a;
 552         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 553         unsigned long flags;
 554
 555         res = asd_can_queue(asd_ha, 1);
 556         if (res)
 557                 return res;
 558
 559         res = 1;
 560         ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
 561         if (res) {
 562                 res = -ENOMEM;
 563                 goto out_err;
 564         }
 565
 566         __list_add(&alist, ascb->list.prev, &ascb->list);
 567         list_for_each_entry(a, &alist, list) {
 568                 a->uldd_task = t;
 569                 t->lldd_task = a;
 570                 break;
 571         }
 572         list_for_each_entry(a, &alist, list) {
 573                 t = a->uldd_task;
 574                 a->uldd_timer = 1;
 575                 if (t->task_proto & SAS_PROTOCOL_STP)
 576                         t->task_proto = SAS_PROTOCOL_STP;
 577                 switch (t->task_proto) {
 578                 case SAS_PROTOCOL_SATA:
 579                 case SAS_PROTOCOL_STP:
 580                         res = asd_build_ata_ascb(a, t, gfp_flags);
 581                         break;
 582                 case SAS_PROTOCOL_SMP:
 583                         res = asd_build_smp_ascb(a, t, gfp_flags);
 584                         break;
 585                 case SAS_PROTOCOL_SSP:
 586                         res = asd_build_ssp_ascb(a, t, gfp_flags);
 587                         break;
 588                 default:
 589                         asd_printk("unknown sas_task proto: 0x%x\n",
 590                                    t->task_proto);
 591                         res = -ENOMEM;
 592                         break;
 593                 }
 594                 if (res)
 595                         goto out_err_unmap;
 596
 597                 spin_lock_irqsave(&t->task_state_lock, flags);
 598                 t->task_state_flags |= SAS_TASK_AT_INITIATOR;
 599                 spin_unlock_irqrestore(&t->task_state_lock, flags);
 600         }
 601         list_del_init(&alist);
 602
 603         res = asd_post_ascb_list(asd_ha, ascb, 1);
 604         if (unlikely(res)) {
 605                 a = NULL;
 606                 __list_add(&alist, ascb->list.prev, &ascb->list);
 607                 goto out_err_unmap;
 608         }
 609
 610         return 0;
 611 out_err_unmap:
 612         {
 613                 struct asd_ascb *b = a;
 614                 list_for_each_entry(a, &alist, list) {
 615                         if (a == b)
 616                                 break;
 617                         t = a->uldd_task;
 618                         spin_lock_irqsave(&t->task_state_lock, flags);
 619                         t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 620                         spin_unlock_irqrestore(&t->task_state_lock, flags);
 621                         switch (t->task_proto) {
 622                         case SAS_PROTOCOL_SATA:
 623                         case SAS_PROTOCOL_STP:
 624                                 asd_unbuild_ata_ascb(a);
 625                                 break;
 626                         case SAS_PROTOCOL_SMP:
 627                                 asd_unbuild_smp_ascb(a);
 628                                 break;
 629                         case SAS_PROTOCOL_SSP:
 630                                 asd_unbuild_ssp_ascb(a);
 631                         default:
 632                                 break;
 633                         }
 634                         t->lldd_task = NULL;
 635                 }
 636         }
 637         list_del_init(&alist);
 638 out_err:
 639         if (ascb)
 640                 asd_ascb_free_list(ascb);
 641         asd_can_dequeue(asd_ha, 1);
 642         return res;
 643 }