git.oblomov.eu Git - linux-2.6/blob - 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         num_sg = pci_map_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
  78                             task->data_dir);
  79         if (num_sg == 0)
  80                 return -ENOMEM;
  81
  82         if (num_sg > 3) {
  83                 int i;
  84
  85                 ascb->sg_arr = asd_alloc_coherent(asd_ha,
  86                                                   num_sg*sizeof(struct sg_el),
  87                                                   gfp_flags);
  88                 if (!ascb->sg_arr) {
  89                         res = -ENOMEM;
  90                         goto err_unmap;
  91                 }
  92                 for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
  93                         struct sg_el *sg =
  94                                 &((struct sg_el *)ascb->sg_arr->vaddr)[i];
  95                         sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
  96                         sg->size = cpu_to_le32((u32)sg_dma_len(sc));
  97                         if (i == num_sg-1)
  98                                 sg->flags |= ASD_SG_EL_LIST_EOL;
  99                 }
 100
 101                 for (sc = task->scatter, i = 0; i < 2; i++, sc++) {
 102                         sg_arr[i].bus_addr =
 103                                 cpu_to_le64((u64)sg_dma_address(sc));
 104                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
 105                 }
 106                 sg_arr[1].next_sg_offs = 2 * sizeof(*sg_arr);
 107                 sg_arr[1].flags |= ASD_SG_EL_LIST_EOS;
 108
 109                 memset(&sg_arr[2], 0, sizeof(*sg_arr));
 110                 sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
 111         } else {
 112                 int i;
 113                 for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
 114                         sg_arr[i].bus_addr =
 115                                 cpu_to_le64((u64)sg_dma_address(sc));
 116                         sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
 117                 }
 118                 sg_arr[i-1].flags |= ASD_SG_EL_LIST_EOL;
 119         }
 120
 121         return 0;
 122 err_unmap:
 123         pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
 124                      task->data_dir);
 125         return res;
 126 }
 127
 128 static inline void asd_unmap_scatterlist(struct asd_ascb *ascb)
 129 {
 130         struct asd_ha_struct *asd_ha = ascb->ha;
 131         struct sas_task *task = ascb->uldd_task;
 132
 133         if (task->data_dir == PCI_DMA_NONE)
 134                 return;
 135
 136         if (task->num_scatter == 0) {
 137                 dma_addr_t dma = (dma_addr_t)
 138                        le64_to_cpu(ascb->scb->ssp_task.sg_element[0].bus_addr);
 139                 pci_unmap_single(ascb->ha->pcidev, dma, task->total_xfer_len,
 140                                  task->data_dir);
 141                 return;
 142         }
 143
 144         asd_free_coherent(asd_ha, ascb->sg_arr);
 145         pci_unmap_sg(asd_ha->pcidev, task->scatter, task->num_scatter,
 146                      task->data_dir);
 147 }
 148
 149 /* ---------- Task complete tasklet ---------- */
 150
 151 static void asd_get_response_tasklet(struct asd_ascb *ascb,
 152                                      struct done_list_struct *dl)
 153 {
 154         struct asd_ha_struct *asd_ha = ascb->ha;
 155         struct sas_task *task = ascb->uldd_task;
 156         struct task_status_struct *ts = &task->task_status;
 157         unsigned long flags;
 158         struct tc_resp_sb_struct {
 159                 __le16 index_escb;
 160                 u8     len_lsb;
 161                 u8     flags;
 162         } __attribute__ ((packed)) *resp_sb = (void *) dl->status_block;
 163
 164 /*      int  size   = ((resp_sb->flags & 7) << 8) | resp_sb->len_lsb; */
 165         int  edb_id = ((resp_sb->flags & 0x70) >> 4)-1;
 166         struct asd_ascb *escb;
 167         struct asd_dma_tok *edb;
 168         void *r;
 169
 170         spin_lock_irqsave(&asd_ha->seq.tc_index_lock, flags);
 171         escb = asd_tc_index_find(&asd_ha->seq,
 172                                  (int)le16_to_cpu(resp_sb->index_escb));
 173         spin_unlock_irqrestore(&asd_ha->seq.tc_index_lock, flags);
 174
 175         if (!escb) {
 176                 ASD_DPRINTK("Uh-oh! No escb for this dl?!\n");
 177                 return;
 178         }
 179
 180         ts->buf_valid_size = 0;
 181         edb = asd_ha->seq.edb_arr[edb_id + escb->edb_index];
 182         r = edb->vaddr;
 183         if (task->task_proto == SAS_PROTO_SSP) {
 184                 struct ssp_response_iu *iu =
 185                         r + 16 + sizeof(struct ssp_frame_hdr);
 186
 187                 ts->residual = le32_to_cpu(*(__le32 *)r);
 188                 ts->resp = SAS_TASK_COMPLETE;
 189                 if (iu->datapres == 0)
 190                         ts->stat = iu->status;
 191                 else if (iu->datapres == 1)
 192                         ts->stat = iu->resp_data[3];
 193                 else if (iu->datapres == 2) {
 194                         ts->stat = SAM_CHECK_COND;
 195                         ts->buf_valid_size = min((u32) SAS_STATUS_BUF_SIZE,
 196                                          be32_to_cpu(iu->sense_data_len));
 197                         memcpy(ts->buf, iu->sense_data, ts->buf_valid_size);
 198                         if (iu->status != SAM_CHECK_COND) {
 199                                 ASD_DPRINTK("device %llx sent sense data, but "
 200                                             "stat(0x%x) is not CHECK_CONDITION"
 201                                             "\n",
 202                                             SAS_ADDR(task->dev->sas_addr),
 203                                             ts->stat);
 204                         }
 205                 }
 206         }  else {
 207                 struct ata_task_resp *resp = (void *) &ts->buf[0];
 208
 209                 ts->residual = le32_to_cpu(*(__le32 *)r);
 210
 211                 if (SAS_STATUS_BUF_SIZE >= sizeof(*resp)) {
 212                         resp->frame_len = le16_to_cpu(*(__le16 *)(r+6));
 213                         memcpy(&resp->ending_fis[0], r+16, 24);
 214                         ts->buf_valid_size = sizeof(*resp);
 215                 }
 216         }
 217
 218         asd_invalidate_edb(escb, edb_id);
 219 }
 220
 221 static void asd_task_tasklet_complete(struct asd_ascb *ascb,
 222                                       struct done_list_struct *dl)
 223 {
 224         struct sas_task *task = ascb->uldd_task;
 225         struct task_status_struct *ts = &task->task_status;
 226         unsigned long flags;
 227         u8 opcode = dl->opcode;
 228
 229         asd_can_dequeue(ascb->ha, 1);
 230
 231 Again:
 232         switch (opcode) {
 233         case TC_NO_ERROR:
 234                 ts->resp = SAS_TASK_COMPLETE;
 235                 ts->stat = SAM_GOOD;
 236                 break;
 237         case TC_UNDERRUN:
 238                 ts->resp = SAS_TASK_COMPLETE;
 239                 ts->stat = SAS_DATA_UNDERRUN;
 240                 ts->residual = le32_to_cpu(*(__le32 *)dl->status_block);
 241                 break;
 242         case TC_OVERRUN:
 243                 ts->resp = SAS_TASK_COMPLETE;
 244                 ts->stat = SAS_DATA_OVERRUN;
 245                 ts->residual = 0;
 246                 break;
 247         case TC_SSP_RESP:
 248         case TC_ATA_RESP:
 249                 ts->resp = SAS_TASK_COMPLETE;
 250                 ts->stat = SAS_PROTO_RESPONSE;
 251                 asd_get_response_tasklet(ascb, dl);
 252                 break;
 253         case TF_OPEN_REJECT:
 254                 ts->resp = SAS_TASK_UNDELIVERED;
 255                 ts->stat = SAS_OPEN_REJECT;
 256                 if (dl->status_block[1] & 2)
 257                         ts->open_rej_reason = 1 + dl->status_block[2];
 258                 else if (dl->status_block[1] & 1)
 259                         ts->open_rej_reason = (dl->status_block[2] >> 4)+10;
 260                 else
 261                         ts->open_rej_reason = SAS_OREJ_UNKNOWN;
 262                 break;
 263         case TF_OPEN_TO:
 264                 ts->resp = SAS_TASK_UNDELIVERED;
 265                 ts->stat = SAS_OPEN_TO;
 266                 break;
 267         case TF_PHY_DOWN:
 268         case TU_PHY_DOWN:
 269                 ts->resp = SAS_TASK_UNDELIVERED;
 270                 ts->stat = SAS_PHY_DOWN;
 271                 break;
 272         case TI_PHY_DOWN:
 273                 ts->resp = SAS_TASK_COMPLETE;
 274                 ts->stat = SAS_PHY_DOWN;
 275                 break;
 276         case TI_BREAK:
 277         case TI_PROTO_ERR:
 278         case TI_NAK:
 279         case TI_ACK_NAK_TO:
 280         case TF_SMP_XMIT_RCV_ERR:
 281         case TC_ATA_R_ERR_RECV:
 282                 ts->resp = SAS_TASK_COMPLETE;
 283                 ts->stat = SAS_INTERRUPTED;
 284                 break;
 285         case TF_BREAK:
 286         case TU_BREAK:
 287         case TU_ACK_NAK_TO:
 288         case TF_SMPRSP_TO:
 289                 ts->resp = SAS_TASK_UNDELIVERED;
 290                 ts->stat = SAS_DEV_NO_RESPONSE;
 291                 break;
 292         case TF_NAK_RECV:
 293                 ts->resp = SAS_TASK_COMPLETE;
 294                 ts->stat = SAS_NAK_R_ERR;
 295                 break;
 296         case TA_I_T_NEXUS_LOSS:
 297                 opcode = dl->status_block[0];
 298                 goto Again;
 299                 break;
 300         case TF_INV_CONN_HANDLE:
 301                 ts->resp = SAS_TASK_UNDELIVERED;
 302                 ts->stat = SAS_DEVICE_UNKNOWN;
 303                 break;
 304         case TF_REQUESTED_N_PENDING:
 305                 ts->resp = SAS_TASK_UNDELIVERED;
 306                 ts->stat = SAS_PENDING;
 307                 break;
 308         case TC_TASK_CLEARED:
 309         case TA_ON_REQ:
 310                 ts->resp = SAS_TASK_COMPLETE;
 311                 ts->stat = SAS_ABORTED_TASK;
 312                 break;
 313
 314         case TF_NO_SMP_CONN:
 315         case TF_TMF_NO_CTX:
 316         case TF_TMF_NO_TAG:
 317         case TF_TMF_TAG_FREE:
 318         case TF_TMF_TASK_DONE:
 319         case TF_TMF_NO_CONN_HANDLE:
 320         case TF_IRTT_TO:
 321         case TF_IU_SHORT:
 322         case TF_DATA_OFFS_ERR:
 323                 ts->resp = SAS_TASK_UNDELIVERED;
 324                 ts->stat = SAS_DEV_NO_RESPONSE;
 325                 break;
 326
 327         case TC_LINK_ADM_RESP:
 328         case TC_CONTROL_PHY:
 329         case TC_RESUME:
 330         case TC_PARTIAL_SG_LIST:
 331         default:
 332                 ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __FUNCTION__, opcode);
 333                 break;
 334         }
 335
 336         switch (task->task_proto) {
 337         case SATA_PROTO:
 338         case SAS_PROTO_STP:
 339                 asd_unbuild_ata_ascb(ascb);
 340                 break;
 341         case SAS_PROTO_SMP:
 342                 asd_unbuild_smp_ascb(ascb);
 343                 break;
 344         case SAS_PROTO_SSP:
 345                 asd_unbuild_ssp_ascb(ascb);
 346         default:
 347                 break;
 348         }
 349
 350         spin_lock_irqsave(&task->task_state_lock, flags);
 351         task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
 352         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 353         task->task_state_flags |= SAS_TASK_STATE_DONE;
 354         if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
 355                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 356                 ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
 357                             "stat 0x%x but aborted by upper layer!\n",
 358                             task, opcode, ts->resp, ts->stat);
 359                 complete(&ascb->completion);
 360         } else {
 361                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 362                 task->lldd_task = NULL;
 363                 asd_ascb_free(ascb);
 364                 mb();
 365                 task->task_done(task);
 366         }
 367 }
 368
 369 /* ---------- ATA ---------- */
 370
 371 static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
 372                               gfp_t gfp_flags)
 373 {
 374         struct domain_device *dev = task->dev;
 375         struct scb *scb;
 376         u8     flags;
 377         int    res = 0;
 378
 379         scb = ascb->scb;
 380
 381         if (unlikely(task->ata_task.device_control_reg_update))
 382                 scb->header.opcode = CONTROL_ATA_DEV;
 383         else if (dev->sata_dev.command_set == ATA_COMMAND_SET)
 384                 scb->header.opcode = INITIATE_ATA_TASK;
 385         else
 386                 scb->header.opcode = INITIATE_ATAPI_TASK;
 387
 388         scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
 389         if (dev->port->oob_mode == SAS_OOB_MODE)
 390                 scb->ata_task.proto_conn_rate |= dev->linkrate;
 391
 392         scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 393         scb->ata_task.fis = task->ata_task.fis;
 394         scb->ata_task.fis.fis_type = 0x27;
 395         if (likely(!task->ata_task.device_control_reg_update))
 396                 scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
 397         scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
 398         if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
 399                 memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
 400                        16);
 401         scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
 402         scb->ata_task.conn_handle = cpu_to_le16(
 403                 (u16)(unsigned long)dev->lldd_dev);
 404
 405         if (likely(!task->ata_task.device_control_reg_update)) {
 406                 flags = 0;
 407                 if (task->ata_task.dma_xfer)
 408                         flags |= DATA_XFER_MODE_DMA;
 409                 if (task->ata_task.use_ncq &&
 410                     dev->sata_dev.command_set != ATAPI_COMMAND_SET)
 411                         flags |= ATA_Q_TYPE_NCQ;
 412                 flags |= data_dir_flags[task->data_dir];
 413                 scb->ata_task.ata_flags = flags;
 414
 415                 scb->ata_task.retry_count = task->ata_task.retry_count;
 416
 417                 flags = 0;
 418                 if (task->ata_task.set_affil_pol)
 419                         flags |= SET_AFFIL_POLICY;
 420                 if (task->ata_task.stp_affil_pol)
 421                         flags |= STP_AFFIL_POLICY;
 422                 scb->ata_task.flags = flags;
 423         }
 424         ascb->tasklet_complete = asd_task_tasklet_complete;
 425
 426         if (likely(!task->ata_task.device_control_reg_update))
 427                 res = asd_map_scatterlist(task, scb->ata_task.sg_element,
 428                                           gfp_flags);
 429
 430         return res;
 431 }
 432
 433 static void asd_unbuild_ata_ascb(struct asd_ascb *a)
 434 {
 435         asd_unmap_scatterlist(a);
 436 }
 437
 438 /* ---------- SMP ---------- */
 439
 440 static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 441                               gfp_t gfp_flags)
 442 {
 443         struct asd_ha_struct *asd_ha = ascb->ha;
 444         struct domain_device *dev = task->dev;
 445         struct scb *scb;
 446
 447         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
 448                    PCI_DMA_FROMDEVICE);
 449         pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
 450                    PCI_DMA_FROMDEVICE);
 451
 452         scb = ascb->scb;
 453
 454         scb->header.opcode = INITIATE_SMP_TASK;
 455
 456         scb->smp_task.proto_conn_rate = dev->linkrate;
 457
 458         scb->smp_task.smp_req.bus_addr =
 459                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
 460         scb->smp_task.smp_req.size =
 461                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);
 462
 463         scb->smp_task.smp_resp.bus_addr =
 464                 cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
 465         scb->smp_task.smp_resp.size =
 466                 cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);
 467
 468         scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
 469         scb->smp_task.conn_handle = cpu_to_le16((u16)
 470                                                 (unsigned long)dev->lldd_dev);
 471
 472         ascb->tasklet_complete = asd_task_tasklet_complete;
 473
 474         return 0;
 475 }
 476
 477 static void asd_unbuild_smp_ascb(struct asd_ascb *a)
 478 {
 479         struct sas_task *task = a->uldd_task;
 480
 481         BUG_ON(!task);
 482         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
 483                      PCI_DMA_FROMDEVICE);
 484         pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
 485                      PCI_DMA_FROMDEVICE);
 486 }
 487
 488 /* ---------- SSP ---------- */
 489
 490 static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
 491                               gfp_t gfp_flags)
 492 {
 493         struct domain_device *dev = task->dev;
 494         struct scb *scb;
 495         int    res = 0;
 496
 497         scb = ascb->scb;
 498
 499         scb->header.opcode = INITIATE_SSP_TASK;
 500
 501         scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
 502         scb->ssp_task.proto_conn_rate |= dev->linkrate;
 503         scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
 504         scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
 505         memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
 506                HASHED_SAS_ADDR_SIZE);
 507         memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
 508                dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
 509         scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);
 510
 511         memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
 512         if (task->ssp_task.enable_first_burst)
 513                 scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
 514         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
 515         scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
 516         memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cdb, 16);
 517
 518         scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
 519         scb->ssp_task.conn_handle = cpu_to_le16(
 520                 (u16)(unsigned long)dev->lldd_dev);
 521         scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
 522         scb->ssp_task.retry_count = scb->ssp_task.retry_count;
 523
 524         ascb->tasklet_complete = asd_task_tasklet_complete;
 525
 526         res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);
 527
 528         return res;
 529 }
 530
 531 static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
 532 {
 533         asd_unmap_scatterlist(a);
 534 }
 535
 536 /* ---------- Execute Task ---------- */
 537
 538 static inline int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
 539 {
 540         int res = 0;
 541         unsigned long flags;
 542
 543         spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
 544         if ((asd_ha->seq.can_queue - num) < 0)
 545                 res = -SAS_QUEUE_FULL;
 546         else
 547                 asd_ha->seq.can_queue -= num;
 548         spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);
 549
 550         return res;
 551 }
 552
 553 int asd_execute_task(struct sas_task *task, const int num,
 554                      gfp_t gfp_flags)
 555 {
 556         int res = 0;
 557         LIST_HEAD(alist);
 558         struct sas_task *t = task;
 559         struct asd_ascb *ascb = NULL, *a;
 560         struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
 561         unsigned long flags;
 562
 563         res = asd_can_queue(asd_ha, num);
 564         if (res)
 565                 return res;
 566
 567         res = num;
 568         ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
 569         if (res) {
 570                 res = -ENOMEM;
 571                 goto out_err;
 572         }
 573
 574         __list_add(&alist, ascb->list.prev, &ascb->list);
 575         list_for_each_entry(a, &alist, list) {
 576                 a->uldd_task = t;
 577                 t->lldd_task = a;
 578                 t = list_entry(t->list.next, struct sas_task, list);
 579         }
 580         list_for_each_entry(a, &alist, list) {
 581                 t = a->uldd_task;
 582                 a->uldd_timer = 1;
 583                 if (t->task_proto & SAS_PROTO_STP)
 584                         t->task_proto = SAS_PROTO_STP;
 585                 switch (t->task_proto) {
 586                 case SATA_PROTO:
 587                 case SAS_PROTO_STP:
 588                         res = asd_build_ata_ascb(a, t, gfp_flags);
 589                         break;
 590                 case SAS_PROTO_SMP:
 591                         res = asd_build_smp_ascb(a, t, gfp_flags);
 592                         break;
 593                 case SAS_PROTO_SSP:
 594                         res = asd_build_ssp_ascb(a, t, gfp_flags);
 595                         break;
 596                 default:
 597                         asd_printk("unknown sas_task proto: 0x%x\n",
 598                                    t->task_proto);
 599                         res = -ENOMEM;
 600                         break;
 601                 }
 602                 if (res)
 603                         goto out_err_unmap;
 604
 605                 spin_lock_irqsave(&t->task_state_lock, flags);
 606                 t->task_state_flags |= SAS_TASK_AT_INITIATOR;
 607                 spin_unlock_irqrestore(&t->task_state_lock, flags);
 608         }
 609         list_del_init(&alist);
 610
 611         res = asd_post_ascb_list(asd_ha, ascb, num);
 612         if (unlikely(res)) {
 613                 a = NULL;
 614                 __list_add(&alist, ascb->list.prev, &ascb->list);
 615                 goto out_err_unmap;
 616         }
 617
 618         return 0;
 619 out_err_unmap:
 620         {
 621                 struct asd_ascb *b = a;
 622                 list_for_each_entry(a, &alist, list) {
 623                         if (a == b)
 624                                 break;
 625                         t = a->uldd_task;
 626                         spin_lock_irqsave(&t->task_state_lock, flags);
 627                         t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 628                         spin_unlock_irqrestore(&t->task_state_lock, flags);
 629                         switch (t->task_proto) {
 630                         case SATA_PROTO:
 631                         case SAS_PROTO_STP:
 632                                 asd_unbuild_ata_ascb(a);
 633                                 break;
 634                         case SAS_PROTO_SMP:
 635                                 asd_unbuild_smp_ascb(a);
 636                                 break;
 637                         case SAS_PROTO_SSP:
 638                                 asd_unbuild_ssp_ascb(a);
 639                         default:
 640                                 break;
 641                         }
 642                         t->lldd_task = NULL;
 643                 }
 644         }
 645         list_del_init(&alist);
 646 out_err:
 647         if (ascb)
 648                 asd_ascb_free_list(ascb);
 649         asd_can_dequeue(asd_ha, num);
 650         return res;
 651 }