drivers/scsi/libsas/sas_ata.c

   1 /*
   2  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  *
   6  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26
  27 #include <scsi/sas_ata.h>
  28 #include "sas_internal.h"
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_tcq.h>
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35 #include "../scsi_sas_internal.h"
  36 #include "../scsi_transport_api.h"
  37 #include <scsi/scsi_eh.h>
  38
  39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  40 {
  41         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  42
  43         /* transport error */
  44         if (ts->resp == SAS_TASK_UNDELIVERED)
  45                 return AC_ERR_ATA_BUS;
  46
  47         /* ts->resp == SAS_TASK_COMPLETE */
  48         /* task delivered, what happened afterwards? */
  49         switch (ts->stat) {
  50                 case SAS_DEV_NO_RESPONSE:
  51                         return AC_ERR_TIMEOUT;
  52
  53                 case SAS_INTERRUPTED:
  54                 case SAS_PHY_DOWN:
  55                 case SAS_NAK_R_ERR:
  56                         return AC_ERR_ATA_BUS;
  57
  58
  59                 case SAS_DATA_UNDERRUN:
  60                         /*
  61                          * Some programs that use the taskfile interface
  62                          * (smartctl in particular) can cause underrun
  63                          * problems.  Ignore these errors, perhaps at our
  64                          * peril.
  65                          */
  66                         return 0;
  67
  68                 case SAS_DATA_OVERRUN:
  69                 case SAS_QUEUE_FULL:
  70                 case SAS_DEVICE_UNKNOWN:
  71                 case SAS_SG_ERR:
  72                         return AC_ERR_INVALID;
  73
  74                 case SAS_OPEN_TO:
  75                 case SAS_OPEN_REJECT:
  76                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  77                                     __func__, ts->stat);
  78                         return AC_ERR_OTHER;
  79
  80                 case SAM_STAT_CHECK_CONDITION:
  81                 case SAS_ABORTED_TASK:
  82                         return AC_ERR_DEV;
  83
  84                 case SAS_PROTO_RESPONSE:
  85                         /* This means the ending_fis has the error
  86                          * value; return 0 here to collect it */
  87                         return 0;
  88                 default:
  89                         return 0;
  90         }
  91 }
  92
  93 static void sas_ata_task_done(struct sas_task *task)
  94 {
  95         struct ata_queued_cmd *qc = task->uldd_task;
  96         struct domain_device *dev;
  97         struct task_status_struct *stat = &task->task_status;
  98         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  99         struct sas_ha_struct *sas_ha;
 100         enum ata_completion_errors ac;
 101         unsigned long flags;
 102
 103         if (!qc)
 104                 goto qc_already_gone;
 105
 106         dev = qc->ap->private_data;
 107         sas_ha = dev->port->ha;
 108
 109         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 110         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 111             ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 112               dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
 113                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 114                 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 115                 dev->sata_dev.sstatus = resp->sstatus;
 116                 dev->sata_dev.serror = resp->serror;
 117                 dev->sata_dev.scontrol = resp->scontrol;
 118         } else {
 119                 ac = sas_to_ata_err(stat);
 120                 if (ac) {
 121                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 122                                     stat->stat);
 123                         /* We saw a SAS error. Send a vague error. */
 124                         qc->err_mask = ac;
 125                         dev->sata_dev.tf.feature = 0x04; /* status err */
 126                         dev->sata_dev.tf.command = ATA_ERR;
 127                 }
 128         }
 129
 130         qc->lldd_task = NULL;
 131         if (qc->scsicmd)
 132                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 133         ata_qc_complete(qc);
 134         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 135
 136         /*
 137          * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 138          * flag is set, then we must have come in via the libsas EH
 139          * functions.  When we exit this function, we need to put the
 140          * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 141          * call cleans up the libata side of things but we're protected
 142          * from the scsi_cmnd going away because the scsi_cmnd is owned
 143          * by the EH, making libata's call to scsi_done a NOP.
 144          */
 145         spin_lock_irqsave(&task->task_state_lock, flags);
 146         if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 147                 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 148         spin_unlock_irqrestore(&task->task_state_lock, flags);
 149
 150 qc_already_gone:
 151         list_del_init(&task->list);
 152         sas_free_task(task);
 153 }
 154
 155 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 156 {
 157         int res;
 158         struct sas_task *task;
 159         struct domain_device *dev = qc->ap->private_data;
 160         struct sas_ha_struct *sas_ha = dev->port->ha;
 161         struct Scsi_Host *host = sas_ha->core.shost;
 162         struct sas_internal *i = to_sas_internal(host->transportt);
 163         struct scatterlist *sg;
 164         unsigned int xfer = 0;
 165         unsigned int si;
 166
 167         /* If the device fell off, no sense in issuing commands */
 168         if (dev->gone)
 169                 return AC_ERR_SYSTEM;
 170
 171         task = sas_alloc_task(GFP_ATOMIC);
 172         if (!task)
 173                 return AC_ERR_SYSTEM;
 174         task->dev = dev;
 175         task->task_proto = SAS_PROTOCOL_STP;
 176         task->task_done = sas_ata_task_done;
 177
 178         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 179             qc->tf.command == ATA_CMD_FPDMA_READ) {
 180                 /* Need to zero out the tag libata assigned us */
 181                 qc->tf.nsect = 0;
 182         }
 183
 184         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 185         task->uldd_task = qc;
 186         if (ata_is_atapi(qc->tf.protocol)) {
 187                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 188                 task->total_xfer_len = qc->nbytes;
 189                 task->num_scatter = qc->n_elem;
 190         } else {
 191                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 192                         xfer += sg->length;
 193
 194                 task->total_xfer_len = xfer;
 195                 task->num_scatter = si;
 196         }
 197
 198         task->data_dir = qc->dma_dir;
 199         task->scatter = qc->sg;
 200         task->ata_task.retry_count = 1;
 201         task->task_state_flags = SAS_TASK_STATE_PENDING;
 202         qc->lldd_task = task;
 203
 204         switch (qc->tf.protocol) {
 205         case ATA_PROT_NCQ:
 206                 task->ata_task.use_ncq = 1;
 207                 /* fall through */
 208         case ATAPI_PROT_DMA:
 209         case ATA_PROT_DMA:
 210                 task->ata_task.dma_xfer = 1;
 211                 break;
 212         }
 213
 214         if (qc->scsicmd)
 215                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 216
 217         if (sas_ha->lldd_max_execute_num < 2)
 218                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 219         else
 220                 res = sas_queue_up(task);
 221
 222         /* Examine */
 223         if (res) {
 224                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 225
 226                 if (qc->scsicmd)
 227                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 228                 sas_free_task(task);
 229                 return AC_ERR_SYSTEM;
 230         }
 231
 232         return 0;
 233 }
 234
 235 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 236 {
 237         struct domain_device *dev = qc->ap->private_data;
 238
 239         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 240         return true;
 241 }
 242
 243 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 244                                unsigned long deadline)
 245 {
 246         struct ata_port *ap = link->ap;
 247         struct domain_device *dev = ap->private_data;
 248         struct sas_internal *i =
 249                 to_sas_internal(dev->port->ha->core.shost->transportt);
 250         int res = TMF_RESP_FUNC_FAILED;
 251         int ret = 0;
 252
 253         if (i->dft->lldd_I_T_nexus_reset)
 254                 res = i->dft->lldd_I_T_nexus_reset(dev);
 255
 256         if (res != TMF_RESP_FUNC_COMPLETE) {
 257                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
 258                 ret = -EAGAIN;
 259         }
 260
 261         switch (dev->sata_dev.command_set) {
 262                 case ATA_COMMAND_SET:
 263                         SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 264                         *class = ATA_DEV_ATA;
 265                         break;
 266                 case ATAPI_COMMAND_SET:
 267                         SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 268                         *class = ATA_DEV_ATAPI;
 269                         break;
 270                 default:
 271                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 272                                     __func__,
 273                                     dev->sata_dev.command_set);
 274                         *class = ATA_DEV_UNKNOWN;
 275                         break;
 276         }
 277
 278         ap->cbl = ATA_CBL_SATA;
 279         return ret;
 280 }
 281
 282 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 283 {
 284         if (qc->flags & ATA_QCFLAG_FAILED)
 285                 qc->err_mask |= AC_ERR_OTHER;
 286
 287         if (qc->err_mask) {
 288                 /*
 289                  * Find the sas_task and kill it.  By this point,
 290                  * libata has decided to kill the qc, so we needn't
 291                  * bother with sas_ata_task_done.  But we still
 292                  * ought to abort the task.
 293                  */
 294                 struct sas_task *task = qc->lldd_task;
 295                 unsigned long flags;
 296
 297                 qc->lldd_task = NULL;
 298                 if (task) {
 299                         /* Should this be a AT(API) device reset? */
 300                         spin_lock_irqsave(&task->task_state_lock, flags);
 301                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 302                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 303
 304                         task->uldd_task = NULL;
 305                         __sas_task_abort(task);
 306                 }
 307         }
 308 }
 309
 310 static struct ata_port_operations sas_sata_ops = {
 311         .prereset               = ata_std_prereset,
 312         .softreset              = NULL,
 313         .hardreset              = sas_ata_hard_reset,
 314         .postreset              = ata_std_postreset,
 315         .error_handler          = ata_std_error_handler,
 316         .post_internal_cmd      = sas_ata_post_internal,
 317         .qc_defer               = ata_std_qc_defer,
 318         .qc_prep                = ata_noop_qc_prep,
 319         .qc_issue               = sas_ata_qc_issue,
 320         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 321         .port_start             = ata_sas_port_start,
 322         .port_stop              = ata_sas_port_stop,
 323 };
 324
 325 static struct ata_port_info sata_port_info = {
 326         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 327         .pio_mask = ATA_PIO4,
 328         .mwdma_mask = ATA_MWDMA2,
 329         .udma_mask = ATA_UDMA6,
 330         .port_ops = &sas_sata_ops
 331 };
 332
 333 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 334                                struct scsi_target *starget)
 335 {
 336         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 337         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 338         struct ata_port *ap;
 339
 340         ata_host_init(&found_dev->sata_dev.ata_host,
 341                       ha->dev,
 342                       sata_port_info.flags,
 343                       &sas_sata_ops);
 344         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 345                                 &sata_port_info,
 346                                 shost);
 347         if (!ap) {
 348                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 349                 return -ENODEV;
 350         }
 351
 352         ap->private_data = found_dev;
 353         ap->cbl = ATA_CBL_SATA;
 354         ap->scsi_host = shost;
 355         found_dev->sata_dev.ap = ap;
 356
 357         return 0;
 358 }
 359
 360 void sas_ata_task_abort(struct sas_task *task)
 361 {
 362         struct ata_queued_cmd *qc = task->uldd_task;
 363         struct completion *waiting;
 364
 365         /* Bounce SCSI-initiated commands to the SCSI EH */
 366         if (qc->scsicmd) {
 367                 struct request_queue *q = qc->scsicmd->device->request_queue;
 368                 unsigned long flags;
 369
 370                 spin_lock_irqsave(q->queue_lock, flags);
 371                 blk_abort_request(qc->scsicmd->request);
 372                 spin_unlock_irqrestore(q->queue_lock, flags);
 373                 scsi_schedule_eh(qc->scsicmd->device->host);
 374                 return;
 375         }
 376
 377         /* Internal command, fake a timeout and complete. */
 378         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 379         qc->flags |= ATA_QCFLAG_FAILED;
 380         qc->err_mask |= AC_ERR_TIMEOUT;
 381         waiting = qc->private_data;
 382         complete(waiting);
 383 }
 384
 385 static void sas_task_timedout(unsigned long _task)
 386 {
 387         struct sas_task *task = (void *) _task;
 388         unsigned long flags;
 389
 390         spin_lock_irqsave(&task->task_state_lock, flags);
 391         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 392                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 393         spin_unlock_irqrestore(&task->task_state_lock, flags);
 394
 395         complete(&task->completion);
 396 }
 397
 398 static void sas_disc_task_done(struct sas_task *task)
 399 {
 400         if (!del_timer(&task->timer))
 401                 return;
 402         complete(&task->completion);
 403 }
 404
 405 #define SAS_DEV_TIMEOUT 10
 406
 407 /**
 408  * sas_execute_task -- Basic task processing for discovery
 409  * @task: the task to be executed
 410  * @buffer: pointer to buffer to do I/O
 411  * @size: size of @buffer
 412  * @dma_dir: DMA direction.  DMA_xxx
 413  */
 414 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 415                             enum dma_data_direction dma_dir)
 416 {
 417         int res = 0;
 418         struct scatterlist *scatter = NULL;
 419         struct task_status_struct *ts = &task->task_status;
 420         int num_scatter = 0;
 421         int retries = 0;
 422         struct sas_internal *i =
 423                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 424
 425         if (dma_dir != DMA_NONE) {
 426                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 427                 if (!scatter)
 428                         goto out;
 429
 430                 sg_init_one(scatter, buffer, size);
 431                 num_scatter = 1;
 432         }
 433
 434         task->task_proto = task->dev->tproto;
 435         task->scatter = scatter;
 436         task->num_scatter = num_scatter;
 437         task->total_xfer_len = size;
 438         task->data_dir = dma_dir;
 439         task->task_done = sas_disc_task_done;
 440         if (dma_dir != DMA_NONE &&
 441             sas_protocol_ata(task->task_proto)) {
 442                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 443                                                task->scatter,
 444                                                task->num_scatter,
 445                                                task->data_dir);
 446         }
 447
 448         for (retries = 0; retries < 5; retries++) {
 449                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 450                 init_completion(&task->completion);
 451
 452                 task->timer.data = (unsigned long) task;
 453                 task->timer.function = sas_task_timedout;
 454                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 455                 add_timer(&task->timer);
 456
 457                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 458                 if (res) {
 459                         del_timer(&task->timer);
 460                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 461                                     res);
 462                         goto ex_err;
 463                 }
 464                 wait_for_completion(&task->completion);
 465                 res = -ECOMM;
 466                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 467                         int res2;
 468                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 469                                     task->task_state_flags);
 470                         res2 = i->dft->lldd_abort_task(task);
 471                         SAS_DPRINTK("came back from abort task\n");
 472                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 473                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 474                                         continue; /* Retry the task */
 475                                 else
 476                                         goto ex_err;
 477                         }
 478                 }
 479                 if (task->task_status.stat == SAM_STAT_BUSY ||
 480                            task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
 481                            task->task_status.stat == SAS_QUEUE_FULL) {
 482                         SAS_DPRINTK("task: q busy, sleeping...\n");
 483                         schedule_timeout_interruptible(HZ);
 484                 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
 485                         struct scsi_sense_hdr shdr;
 486
 487                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 488                                                   &shdr)) {
 489                                 SAS_DPRINTK("couldn't normalize sense\n");
 490                                 continue;
 491                         }
 492                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 493                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 494                              shdr.ascq == 1)) {
 495                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 496                                             "powering up or not ready yet, "
 497                                             "sleeping...\n",
 498                                             SAS_ADDR(task->dev->sas_addr),
 499                                             SAS_ADDR(task->ssp_task.LUN));
 500
 501                                 schedule_timeout_interruptible(5*HZ);
 502                         } else if (shdr.sense_key == 1) {
 503                                 res = 0;
 504                                 break;
 505                         } else if (shdr.sense_key == 5) {
 506                                 break;
 507                         } else {
 508                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 509                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 510                                             "\n",
 511                                             SAS_ADDR(task->dev->sas_addr),
 512                                             SAS_ADDR(task->ssp_task.LUN),
 513                                             shdr.sense_key,
 514                                             shdr.asc, shdr.ascq);
 515                         }
 516                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 517                            task->task_status.stat != SAM_STAT_GOOD) {
 518                         SAS_DPRINTK("task finished with resp:0x%x, "
 519                                     "stat:0x%x\n",
 520                                     task->task_status.resp,
 521                                     task->task_status.stat);
 522                         goto ex_err;
 523                 } else {
 524                         res = 0;
 525                         break;
 526                 }
 527         }
 528 ex_err:
 529         if (dma_dir != DMA_NONE) {
 530                 if (sas_protocol_ata(task->task_proto))
 531                         dma_unmap_sg(task->dev->port->ha->dev,
 532                                      task->scatter, task->num_scatter,
 533                                      task->data_dir);
 534                 kfree(scatter);
 535         }
 536 out:
 537         return res;
 538 }
 539
 540 /* ---------- SATA ---------- */
 541
 542 static void sas_get_ata_command_set(struct domain_device *dev)
 543 {
 544         struct dev_to_host_fis *fis =
 545                 (struct dev_to_host_fis *) dev->frame_rcvd;
 546
 547         if ((fis->sector_count == 1 && /* ATA */
 548              fis->lbal         == 1 &&
 549              fis->lbam         == 0 &&
 550              fis->lbah         == 0 &&
 551              fis->device       == 0)
 552             ||
 553             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 554              fis->lbal         == 0 &&
 555              fis->lbam         == 0xCE &&
 556              fis->lbah         == 0xAA &&
 557              (fis->device & ~0x10) == 0))
 558
 559                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 560
 561         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 562                   fis->lbal             == 1 &&
 563                   fis->byte_count_low   == 0x14 &&
 564                   fis->byte_count_high  == 0xEB &&
 565                   (fis->device & ~0x10) == 0))
 566
 567                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 568
 569         else if ((fis->sector_count == 1 && /* SEMB */
 570                   fis->lbal         == 1 &&
 571                   fis->lbam         == 0x3C &&
 572                   fis->lbah         == 0xC3 &&
 573                   fis->device       == 0)
 574                 ||
 575                  (fis->interrupt_reason == 1 && /* SATA PM */
 576                   fis->lbal             == 1 &&
 577                   fis->byte_count_low   == 0x69 &&
 578                   fis->byte_count_high  == 0x96 &&
 579                   (fis->device & ~0x10) == 0))
 580
 581                 /* Treat it as a superset? */
 582                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 583 }
 584
 585 /**
 586  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 587  * @dev: the device to send the command to
 588  * @command: the command register
 589  * @features: the features register
 590  * @buffer: pointer to buffer to do I/O
 591  * @size: size of @buffer
 592  * @dma_dir: DMA direction.  DMA_xxx
 593  */
 594 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 595                              u8 features, void *buffer, int size,
 596                              enum dma_data_direction dma_dir)
 597 {
 598         int res = 0;
 599         struct sas_task *task;
 600         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 601                 &dev->frame_rcvd[0];
 602
 603         res = -ENOMEM;
 604         task = sas_alloc_task(GFP_KERNEL);
 605         if (!task)
 606                 goto out;
 607
 608         task->dev = dev;
 609
 610         task->ata_task.fis.fis_type = 0x27;
 611         task->ata_task.fis.command = command;
 612         task->ata_task.fis.features = features;
 613         task->ata_task.fis.device = d2h_fis->device;
 614         task->ata_task.retry_count = 1;
 615
 616         res = sas_execute_task(task, buffer, size, dma_dir);
 617
 618         sas_free_task(task);
 619 out:
 620         return res;
 621 }
 622
 623 #define ATA_IDENTIFY_DEV         0xEC
 624 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 625 #define ATA_SET_FEATURES         0xEF
 626 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 627
 628 /**
 629  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 630  * @dev: STP/SATA device of interest (ATA/ATAPI)
 631  *
 632  * The LLDD has already been notified of this device, so that we can
 633  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 634  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 635  * performance for this device.
 636  */
 637 static int sas_discover_sata_dev(struct domain_device *dev)
 638 {
 639         int     res;
 640         __le16  *identify_x;
 641         u8      command;
 642
 643         identify_x = kzalloc(512, GFP_KERNEL);
 644         if (!identify_x)
 645                 return -ENOMEM;
 646
 647         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 648                 dev->sata_dev.identify_device = identify_x;
 649                 command = ATA_IDENTIFY_DEV;
 650         } else {
 651                 dev->sata_dev.identify_packet_device = identify_x;
 652                 command = ATA_IDENTIFY_PACKET_DEV;
 653         }
 654
 655         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 656                                 DMA_FROM_DEVICE);
 657         if (res)
 658                 goto out_err;
 659
 660         /* lives on the media? */
 661         if (le16_to_cpu(identify_x[0]) & 4) {
 662                 /* incomplete response */
 663                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 664                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 665                 if (!(identify_x[83] & cpu_to_le16(1<<6)))
 666                         goto cont1;
 667                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 668                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 669                                         NULL, 0, DMA_NONE);
 670                 if (res)
 671                         goto cont1;
 672
 673                 schedule_timeout_interruptible(5*HZ); /* More time? */
 674                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 675                                         DMA_FROM_DEVICE);
 676                 if (res)
 677                         goto out_err;
 678         }
 679 cont1:
 680         /* XXX Hint: register this SATA device with SATL.
 681            When this returns, dev->sata_dev->lu is alive and
 682            present.
 683         sas_satl_register_dev(dev);
 684         */
 685
 686         sas_fill_in_rphy(dev, dev->rphy);
 687
 688         return 0;
 689 out_err:
 690         dev->sata_dev.identify_packet_device = NULL;
 691         dev->sata_dev.identify_device = NULL;
 692         kfree(identify_x);
 693         return res;
 694 }
 695
 696 static int sas_discover_sata_pm(struct domain_device *dev)
 697 {
 698         return -ENODEV;
 699 }
 700
 701 /**
 702  * sas_discover_sata -- discover an STP/SATA domain device
 703  * @dev: pointer to struct domain_device of interest
 704  *
 705  * First we notify the LLDD of this device, so we can send frames to
 706  * it.  Then depending on the type of device we call the appropriate
 707  * discover functions.  Once device discover is done, we notify the
 708  * LLDD so that it can fine-tune its parameters for the device, by
 709  * removing it and then adding it.  That is, the second time around,
 710  * the driver would have certain fields, that it is looking at, set.
 711  * Finally we initialize the kobj so that the device can be added to
 712  * the system at registration time.  Devices directly attached to a HA
 713  * port, have no parents.  All other devices do, and should have their
 714  * "parent" pointer set appropriately before calling this function.
 715  */
 716 int sas_discover_sata(struct domain_device *dev)
 717 {
 718         int res;
 719
 720         sas_get_ata_command_set(dev);
 721
 722         res = sas_notify_lldd_dev_found(dev);
 723         if (res)
 724                 return res;
 725
 726         switch (dev->dev_type) {
 727         case SATA_DEV:
 728                 res = sas_discover_sata_dev(dev);
 729                 break;
 730         case SATA_PM:
 731                 res = sas_discover_sata_pm(dev);
 732                 break;
 733         default:
 734                 break;
 735         }
 736         sas_notify_lldd_dev_gone(dev);
 737         if (!res) {
 738                 sas_notify_lldd_dev_found(dev);
 739                 res = sas_rphy_add(dev->rphy);
 740         }
 741
 742         return res;
 743 }
 744
 745 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 746 {
 747         struct scsi_device *sdev;
 748
 749         shost_for_each_device(sdev, shost) {
 750                 struct domain_device *ddev = sdev_to_domain_dev(sdev);
 751                 struct ata_port *ap = ddev->sata_dev.ap;
 752
 753                 if (!dev_is_sata(ddev))
 754                         continue;
 755
 756                 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
 757                 ata_scsi_port_error_handler(shost, ap);
 758         }
 759 }
 760
 761 int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
 762                       enum blk_eh_timer_return *rtn)
 763 {
 764         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 765
 766         if (!dev_is_sata(ddev) || task)
 767                 return 0;
 768
 769         /* we're a sata device with no task, so this must be a libata
 770          * eh timeout.  Ideally should hook into libata timeout
 771          * handling, but there's no point, it just wants to activate
 772          * the eh thread */
 773         *rtn = BLK_EH_NOT_HANDLED;
 774         return 1;
 775 }
 776
 777 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 778                struct list_head *done_q)
 779 {
 780         int rtn = 0;
 781         struct scsi_cmnd *cmd, *n;
 782         struct ata_port *ap;
 783
 784         do {
 785                 LIST_HEAD(sata_q);
 786
 787                 ap = NULL;
 788
 789                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 790                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 791
 792                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 793                                 continue;
 794                         if (ap && ap != ddev->sata_dev.ap)
 795                                 continue;
 796                         ap = ddev->sata_dev.ap;
 797                         rtn = 1;
 798                         list_move(&cmd->eh_entry, &sata_q);
 799                 }
 800
 801                 if (!list_empty(&sata_q)) {
 802                         ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
 803                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 804                         /*
 805                          * ata's error handler may leave the cmd on the list
 806                          * so make sure they don't remain on a stack list
 807                          * about to go out of scope.
 808                          *
 809                          * This looks strange, since the commands are
 810                          * now part of no list, but the next error
 811                          * action will be ata_port_error_handler()
 812                          * which takes no list and sweeps them up
 813                          * anyway from the ata tag array.
 814                          */
 815                         while (!list_empty(&sata_q))
 816                                 list_del_init(sata_q.next);
 817                 }
 818         } while (ap);
 819
 820         return rtn;
 821 }