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
  26 #include <scsi/sas_ata.h>
  27 #include "sas_internal.h"
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_sas.h>
  34 #include "../scsi_sas_internal.h"
  35 #include "../scsi_transport_api.h"
  36 #include <scsi/scsi_eh.h>
  37
  38 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  39 {
  40         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  41
  42         /* transport error */
  43         if (ts->resp == SAS_TASK_UNDELIVERED)
  44                 return AC_ERR_ATA_BUS;
  45
  46         /* ts->resp == SAS_TASK_COMPLETE */
  47         /* task delivered, what happened afterwards? */
  48         switch (ts->stat) {
  49                 case SAS_DEV_NO_RESPONSE:
  50                         return AC_ERR_TIMEOUT;
  51
  52                 case SAS_INTERRUPTED:
  53                 case SAS_PHY_DOWN:
  54                 case SAS_NAK_R_ERR:
  55                         return AC_ERR_ATA_BUS;
  56
  57
  58                 case SAS_DATA_UNDERRUN:
  59                         /*
  60                          * Some programs that use the taskfile interface
  61                          * (smartctl in particular) can cause underrun
  62                          * problems.  Ignore these errors, perhaps at our
  63                          * peril.
  64                          */
  65                         return 0;
  66
  67                 case SAS_DATA_OVERRUN:
  68                 case SAS_QUEUE_FULL:
  69                 case SAS_DEVICE_UNKNOWN:
  70                 case SAS_SG_ERR:
  71                         return AC_ERR_INVALID;
  72
  73                 case SAM_CHECK_COND:
  74                 case SAS_OPEN_TO:
  75                 case SAS_OPEN_REJECT:
  76                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  77                                     __FUNCTION__, ts->stat);
  78                         return AC_ERR_OTHER;
  79
  80                 case SAS_ABORTED_TASK:
  81                         return AC_ERR_DEV;
  82
  83                 case SAS_PROTO_RESPONSE:
  84                         /* This means the ending_fis has the error
  85                          * value; return 0 here to collect it */
  86                         return 0;
  87                 default:
  88                         return 0;
  89         }
  90 }
  91
  92 static void sas_ata_task_done(struct sas_task *task)
  93 {
  94         struct ata_queued_cmd *qc = task->uldd_task;
  95         struct domain_device *dev;
  96         struct task_status_struct *stat = &task->task_status;
  97         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  98         struct sas_ha_struct *sas_ha;
  99         enum ata_completion_errors ac;
 100         unsigned long flags;
 101
 102         if (!qc)
 103                 goto qc_already_gone;
 104
 105         dev = qc->ap->private_data;
 106         sas_ha = dev->port->ha;
 107
 108         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 109         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
 110                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 111                 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 112                 dev->sata_dev.sstatus = resp->sstatus;
 113                 dev->sata_dev.serror = resp->serror;
 114                 dev->sata_dev.scontrol = resp->scontrol;
 115         } else if (stat->stat != SAM_STAT_GOOD) {
 116                 ac = sas_to_ata_err(stat);
 117                 if (ac) {
 118                         SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__,
 119                                     stat->stat);
 120                         /* We saw a SAS error. Send a vague error. */
 121                         qc->err_mask = ac;
 122                         dev->sata_dev.tf.feature = 0x04; /* status err */
 123                         dev->sata_dev.tf.command = ATA_ERR;
 124                 }
 125         }
 126
 127         qc->lldd_task = NULL;
 128         if (qc->scsicmd)
 129                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 130         ata_qc_complete(qc);
 131         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 132
 133         /*
 134          * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 135          * flag is set, then we must have come in via the libsas EH
 136          * functions.  When we exit this function, we need to put the
 137          * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 138          * call cleans up the libata side of things but we're protected
 139          * from the scsi_cmnd going away because the scsi_cmnd is owned
 140          * by the EH, making libata's call to scsi_done a NOP.
 141          */
 142         spin_lock_irqsave(&task->task_state_lock, flags);
 143         if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 144                 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 145         spin_unlock_irqrestore(&task->task_state_lock, flags);
 146
 147 qc_already_gone:
 148         list_del_init(&task->list);
 149         sas_free_task(task);
 150 }
 151
 152 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 153 {
 154         int res;
 155         struct sas_task *task;
 156         struct domain_device *dev = qc->ap->private_data;
 157         struct sas_ha_struct *sas_ha = dev->port->ha;
 158         struct Scsi_Host *host = sas_ha->core.shost;
 159         struct sas_internal *i = to_sas_internal(host->transportt);
 160         struct scatterlist *sg;
 161         unsigned int xfer = 0;
 162         unsigned int si;
 163
 164         task = sas_alloc_task(GFP_ATOMIC);
 165         if (!task)
 166                 return AC_ERR_SYSTEM;
 167         task->dev = dev;
 168         task->task_proto = SAS_PROTOCOL_STP;
 169         task->task_done = sas_ata_task_done;
 170
 171         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 172             qc->tf.command == ATA_CMD_FPDMA_READ) {
 173                 /* Need to zero out the tag libata assigned us */
 174                 qc->tf.nsect = 0;
 175         }
 176
 177         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 178         task->uldd_task = qc;
 179         if (ata_is_atapi(qc->tf.protocol)) {
 180                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 181                 task->total_xfer_len = qc->nbytes;
 182                 task->num_scatter = qc->n_elem;
 183         } else {
 184                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 185                         xfer += sg->length;
 186
 187                 task->total_xfer_len = xfer;
 188                 task->num_scatter = si;
 189         }
 190
 191         task->data_dir = qc->dma_dir;
 192         task->scatter = qc->sg;
 193         task->ata_task.retry_count = 1;
 194         task->task_state_flags = SAS_TASK_STATE_PENDING;
 195         qc->lldd_task = task;
 196
 197         switch (qc->tf.protocol) {
 198         case ATA_PROT_NCQ:
 199                 task->ata_task.use_ncq = 1;
 200                 /* fall through */
 201         case ATAPI_PROT_DMA:
 202         case ATA_PROT_DMA:
 203                 task->ata_task.dma_xfer = 1;
 204                 break;
 205         }
 206
 207         if (qc->scsicmd)
 208                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 209
 210         if (sas_ha->lldd_max_execute_num < 2)
 211                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 212         else
 213                 res = sas_queue_up(task);
 214
 215         /* Examine */
 216         if (res) {
 217                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 218
 219                 if (qc->scsicmd)
 220                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 221                 sas_free_task(task);
 222                 return AC_ERR_SYSTEM;
 223         }
 224
 225         return 0;
 226 }
 227
 228 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 229 {
 230         struct domain_device *dev = qc->ap->private_data;
 231
 232         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 233         return true;
 234 }
 235
 236 static u8 sas_ata_check_status(struct ata_port *ap)
 237 {
 238         struct domain_device *dev = ap->private_data;
 239         return dev->sata_dev.tf.command;
 240 }
 241
 242 static void sas_ata_phy_reset(struct ata_port *ap)
 243 {
 244         struct domain_device *dev = ap->private_data;
 245         struct sas_internal *i =
 246                 to_sas_internal(dev->port->ha->core.shost->transportt);
 247         int res = TMF_RESP_FUNC_FAILED;
 248
 249         if (i->dft->lldd_I_T_nexus_reset)
 250                 res = i->dft->lldd_I_T_nexus_reset(dev);
 251
 252         if (res != TMF_RESP_FUNC_COMPLETE)
 253                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);
 254
 255         switch (dev->sata_dev.command_set) {
 256                 case ATA_COMMAND_SET:
 257                         SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
 258                         ap->link.device[0].class = ATA_DEV_ATA;
 259                         break;
 260                 case ATAPI_COMMAND_SET:
 261                         SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
 262                         ap->link.device[0].class = ATA_DEV_ATAPI;
 263                         break;
 264                 default:
 265                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 266                                     __FUNCTION__,
 267                                     dev->sata_dev.command_set);
 268                         ap->link.device[0].class = ATA_DEV_UNKNOWN;
 269                         break;
 270         }
 271
 272         ap->cbl = ATA_CBL_SATA;
 273 }
 274
 275 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 276 {
 277         if (qc->flags & ATA_QCFLAG_FAILED)
 278                 qc->err_mask |= AC_ERR_OTHER;
 279
 280         if (qc->err_mask) {
 281                 /*
 282                  * Find the sas_task and kill it.  By this point,
 283                  * libata has decided to kill the qc, so we needn't
 284                  * bother with sas_ata_task_done.  But we still
 285                  * ought to abort the task.
 286                  */
 287                 struct sas_task *task = qc->lldd_task;
 288                 unsigned long flags;
 289
 290                 qc->lldd_task = NULL;
 291                 if (task) {
 292                         /* Should this be a AT(API) device reset? */
 293                         spin_lock_irqsave(&task->task_state_lock, flags);
 294                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 295                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 296
 297                         task->uldd_task = NULL;
 298                         __sas_task_abort(task);
 299                 }
 300         }
 301 }
 302
 303 static int sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 304                               u32 val)
 305 {
 306         struct domain_device *dev = ap->private_data;
 307
 308         SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 309         switch (sc_reg_in) {
 310                 case SCR_STATUS:
 311                         dev->sata_dev.sstatus = val;
 312                         break;
 313                 case SCR_CONTROL:
 314                         dev->sata_dev.scontrol = val;
 315                         break;
 316                 case SCR_ERROR:
 317                         dev->sata_dev.serror = val;
 318                         break;
 319                 case SCR_ACTIVE:
 320                         dev->sata_dev.ap->link.sactive = val;
 321                         break;
 322                 default:
 323                         return -EINVAL;
 324         }
 325         return 0;
 326 }
 327
 328 static int sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in,
 329                             u32 *val)
 330 {
 331         struct domain_device *dev = ap->private_data;
 332
 333         SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 334         switch (sc_reg_in) {
 335                 case SCR_STATUS:
 336                         *val = dev->sata_dev.sstatus;
 337                         return 0;
 338                 case SCR_CONTROL:
 339                         *val = dev->sata_dev.scontrol;
 340                         return 0;
 341                 case SCR_ERROR:
 342                         *val = dev->sata_dev.serror;
 343                         return 0;
 344                 case SCR_ACTIVE:
 345                         *val = dev->sata_dev.ap->link.sactive;
 346                         return 0;
 347                 default:
 348                         return -EINVAL;
 349         }
 350 }
 351
 352 static struct ata_port_operations sas_sata_ops = {
 353         .sff_check_status       = sas_ata_check_status,
 354         .sff_check_altstatus    = sas_ata_check_status,
 355         .sff_dev_select         = ata_noop_dev_select,
 356         .phy_reset              = sas_ata_phy_reset,
 357         .post_internal_cmd      = sas_ata_post_internal,
 358         .qc_prep                = ata_noop_qc_prep,
 359         .qc_issue               = sas_ata_qc_issue,
 360         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 361         .port_start             = ata_sas_port_start,
 362         .port_stop              = ata_sas_port_stop,
 363         .scr_read               = sas_ata_scr_read,
 364         .scr_write              = sas_ata_scr_write
 365 };
 366
 367 static struct ata_port_info sata_port_info = {
 368         .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 369                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 370         .pio_mask = 0x1f, /* PIO0-4 */
 371         .mwdma_mask = 0x07, /* MWDMA0-2 */
 372         .udma_mask = ATA_UDMA6,
 373         .port_ops = &sas_sata_ops
 374 };
 375
 376 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 377                                struct scsi_target *starget)
 378 {
 379         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 380         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 381         struct ata_port *ap;
 382
 383         ata_host_init(&found_dev->sata_dev.ata_host,
 384                       ha->dev,
 385                       sata_port_info.flags,
 386                       &sas_sata_ops);
 387         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 388                                 &sata_port_info,
 389                                 shost);
 390         if (!ap) {
 391                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 392                 return -ENODEV;
 393         }
 394
 395         ap->private_data = found_dev;
 396         ap->cbl = ATA_CBL_SATA;
 397         ap->scsi_host = shost;
 398         found_dev->sata_dev.ap = ap;
 399
 400         return 0;
 401 }
 402
 403 void sas_ata_task_abort(struct sas_task *task)
 404 {
 405         struct ata_queued_cmd *qc = task->uldd_task;
 406         struct completion *waiting;
 407
 408         /* Bounce SCSI-initiated commands to the SCSI EH */
 409         if (qc->scsicmd) {
 410                 scsi_req_abort_cmd(qc->scsicmd);
 411                 scsi_schedule_eh(qc->scsicmd->device->host);
 412                 return;
 413         }
 414
 415         /* Internal command, fake a timeout and complete. */
 416         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 417         qc->flags |= ATA_QCFLAG_FAILED;
 418         qc->err_mask |= AC_ERR_TIMEOUT;
 419         waiting = qc->private_data;
 420         complete(waiting);
 421 }
 422
 423 static void sas_task_timedout(unsigned long _task)
 424 {
 425         struct sas_task *task = (void *) _task;
 426         unsigned long flags;
 427
 428         spin_lock_irqsave(&task->task_state_lock, flags);
 429         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 430                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 431         spin_unlock_irqrestore(&task->task_state_lock, flags);
 432
 433         complete(&task->completion);
 434 }
 435
 436 static void sas_disc_task_done(struct sas_task *task)
 437 {
 438         if (!del_timer(&task->timer))
 439                 return;
 440         complete(&task->completion);
 441 }
 442
 443 #define SAS_DEV_TIMEOUT 10
 444
 445 /**
 446  * sas_execute_task -- Basic task processing for discovery
 447  * @task: the task to be executed
 448  * @buffer: pointer to buffer to do I/O
 449  * @size: size of @buffer
 450  * @dma_dir: DMA direction.  DMA_xxx
 451  */
 452 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 453                             enum dma_data_direction dma_dir)
 454 {
 455         int res = 0;
 456         struct scatterlist *scatter = NULL;
 457         struct task_status_struct *ts = &task->task_status;
 458         int num_scatter = 0;
 459         int retries = 0;
 460         struct sas_internal *i =
 461                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 462
 463         if (dma_dir != DMA_NONE) {
 464                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 465                 if (!scatter)
 466                         goto out;
 467
 468                 sg_init_one(scatter, buffer, size);
 469                 num_scatter = 1;
 470         }
 471
 472         task->task_proto = task->dev->tproto;
 473         task->scatter = scatter;
 474         task->num_scatter = num_scatter;
 475         task->total_xfer_len = size;
 476         task->data_dir = dma_dir;
 477         task->task_done = sas_disc_task_done;
 478         if (dma_dir != DMA_NONE &&
 479             sas_protocol_ata(task->task_proto)) {
 480                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 481                                                task->scatter,
 482                                                task->num_scatter,
 483                                                task->data_dir);
 484         }
 485
 486         for (retries = 0; retries < 5; retries++) {
 487                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 488                 init_completion(&task->completion);
 489
 490                 task->timer.data = (unsigned long) task;
 491                 task->timer.function = sas_task_timedout;
 492                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 493                 add_timer(&task->timer);
 494
 495                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 496                 if (res) {
 497                         del_timer(&task->timer);
 498                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 499                                     res);
 500                         goto ex_err;
 501                 }
 502                 wait_for_completion(&task->completion);
 503                 res = -ECOMM;
 504                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 505                         int res2;
 506                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 507                                     task->task_state_flags);
 508                         res2 = i->dft->lldd_abort_task(task);
 509                         SAS_DPRINTK("came back from abort task\n");
 510                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 511                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 512                                         continue; /* Retry the task */
 513                                 else
 514                                         goto ex_err;
 515                         }
 516                 }
 517                 if (task->task_status.stat == SAM_BUSY ||
 518                            task->task_status.stat == SAM_TASK_SET_FULL ||
 519                            task->task_status.stat == SAS_QUEUE_FULL) {
 520                         SAS_DPRINTK("task: q busy, sleeping...\n");
 521                         schedule_timeout_interruptible(HZ);
 522                 } else if (task->task_status.stat == SAM_CHECK_COND) {
 523                         struct scsi_sense_hdr shdr;
 524
 525                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 526                                                   &shdr)) {
 527                                 SAS_DPRINTK("couldn't normalize sense\n");
 528                                 continue;
 529                         }
 530                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 531                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 532                              shdr.ascq == 1)) {
 533                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 534                                             "powering up or not ready yet, "
 535                                             "sleeping...\n",
 536                                             SAS_ADDR(task->dev->sas_addr),
 537                                             SAS_ADDR(task->ssp_task.LUN));
 538
 539                                 schedule_timeout_interruptible(5*HZ);
 540                         } else if (shdr.sense_key == 1) {
 541                                 res = 0;
 542                                 break;
 543                         } else if (shdr.sense_key == 5) {
 544                                 break;
 545                         } else {
 546                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 547                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 548                                             "\n",
 549                                             SAS_ADDR(task->dev->sas_addr),
 550                                             SAS_ADDR(task->ssp_task.LUN),
 551                                             shdr.sense_key,
 552                                             shdr.asc, shdr.ascq);
 553                         }
 554                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 555                            task->task_status.stat != SAM_GOOD) {
 556                         SAS_DPRINTK("task finished with resp:0x%x, "
 557                                     "stat:0x%x\n",
 558                                     task->task_status.resp,
 559                                     task->task_status.stat);
 560                         goto ex_err;
 561                 } else {
 562                         res = 0;
 563                         break;
 564                 }
 565         }
 566 ex_err:
 567         if (dma_dir != DMA_NONE) {
 568                 if (sas_protocol_ata(task->task_proto))
 569                         dma_unmap_sg(task->dev->port->ha->dev,
 570                                      task->scatter, task->num_scatter,
 571                                      task->data_dir);
 572                 kfree(scatter);
 573         }
 574 out:
 575         return res;
 576 }
 577
 578 /* ---------- SATA ---------- */
 579
 580 static void sas_get_ata_command_set(struct domain_device *dev)
 581 {
 582         struct dev_to_host_fis *fis =
 583                 (struct dev_to_host_fis *) dev->frame_rcvd;
 584
 585         if ((fis->sector_count == 1 && /* ATA */
 586              fis->lbal         == 1 &&
 587              fis->lbam         == 0 &&
 588              fis->lbah         == 0 &&
 589              fis->device       == 0)
 590             ||
 591             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 592              fis->lbal         == 0 &&
 593              fis->lbam         == 0xCE &&
 594              fis->lbah         == 0xAA &&
 595              (fis->device & ~0x10) == 0))
 596
 597                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 598
 599         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 600                   fis->lbal             == 1 &&
 601                   fis->byte_count_low   == 0x14 &&
 602                   fis->byte_count_high  == 0xEB &&
 603                   (fis->device & ~0x10) == 0))
 604
 605                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 606
 607         else if ((fis->sector_count == 1 && /* SEMB */
 608                   fis->lbal         == 1 &&
 609                   fis->lbam         == 0x3C &&
 610                   fis->lbah         == 0xC3 &&
 611                   fis->device       == 0)
 612                 ||
 613                  (fis->interrupt_reason == 1 && /* SATA PM */
 614                   fis->lbal             == 1 &&
 615                   fis->byte_count_low   == 0x69 &&
 616                   fis->byte_count_high  == 0x96 &&
 617                   (fis->device & ~0x10) == 0))
 618
 619                 /* Treat it as a superset? */
 620                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 621 }
 622
 623 /**
 624  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 625  * @dev: the device to send the command to
 626  * @command: the command register
 627  * @features: the features register
 628  * @buffer: pointer to buffer to do I/O
 629  * @size: size of @buffer
 630  * @dma_dir: DMA direction.  DMA_xxx
 631  */
 632 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 633                              u8 features, void *buffer, int size,
 634                              enum dma_data_direction dma_dir)
 635 {
 636         int res = 0;
 637         struct sas_task *task;
 638         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 639                 &dev->frame_rcvd[0];
 640
 641         res = -ENOMEM;
 642         task = sas_alloc_task(GFP_KERNEL);
 643         if (!task)
 644                 goto out;
 645
 646         task->dev = dev;
 647
 648         task->ata_task.fis.fis_type = 0x27;
 649         task->ata_task.fis.command = command;
 650         task->ata_task.fis.features = features;
 651         task->ata_task.fis.device = d2h_fis->device;
 652         task->ata_task.retry_count = 1;
 653
 654         res = sas_execute_task(task, buffer, size, dma_dir);
 655
 656         sas_free_task(task);
 657 out:
 658         return res;
 659 }
 660
 661 #define ATA_IDENTIFY_DEV         0xEC
 662 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 663 #define ATA_SET_FEATURES         0xEF
 664 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 665
 666 /**
 667  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 668  * @dev: STP/SATA device of interest (ATA/ATAPI)
 669  *
 670  * The LLDD has already been notified of this device, so that we can
 671  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 672  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 673  * performance for this device.
 674  */
 675 static int sas_discover_sata_dev(struct domain_device *dev)
 676 {
 677         int     res;
 678         __le16  *identify_x;
 679         u8      command;
 680
 681         identify_x = kzalloc(512, GFP_KERNEL);
 682         if (!identify_x)
 683                 return -ENOMEM;
 684
 685         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 686                 dev->sata_dev.identify_device = identify_x;
 687                 command = ATA_IDENTIFY_DEV;
 688         } else {
 689                 dev->sata_dev.identify_packet_device = identify_x;
 690                 command = ATA_IDENTIFY_PACKET_DEV;
 691         }
 692
 693         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 694                                 DMA_FROM_DEVICE);
 695         if (res)
 696                 goto out_err;
 697
 698         /* lives on the media? */
 699         if (le16_to_cpu(identify_x[0]) & 4) {
 700                 /* incomplete response */
 701                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 702                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 703                 if (!le16_to_cpu(identify_x[83] & (1<<6)))
 704                         goto cont1;
 705                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 706                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 707                                         NULL, 0, DMA_NONE);
 708                 if (res)
 709                         goto cont1;
 710
 711                 schedule_timeout_interruptible(5*HZ); /* More time? */
 712                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 713                                         DMA_FROM_DEVICE);
 714                 if (res)
 715                         goto out_err;
 716         }
 717 cont1:
 718         /* XXX Hint: register this SATA device with SATL.
 719            When this returns, dev->sata_dev->lu is alive and
 720            present.
 721         sas_satl_register_dev(dev);
 722         */
 723
 724         sas_fill_in_rphy(dev, dev->rphy);
 725
 726         return 0;
 727 out_err:
 728         dev->sata_dev.identify_packet_device = NULL;
 729         dev->sata_dev.identify_device = NULL;
 730         kfree(identify_x);
 731         return res;
 732 }
 733
 734 static int sas_discover_sata_pm(struct domain_device *dev)
 735 {
 736         return -ENODEV;
 737 }
 738
 739 /**
 740  * sas_discover_sata -- discover an STP/SATA domain device
 741  * @dev: pointer to struct domain_device of interest
 742  *
 743  * First we notify the LLDD of this device, so we can send frames to
 744  * it.  Then depending on the type of device we call the appropriate
 745  * discover functions.  Once device discover is done, we notify the
 746  * LLDD so that it can fine-tune its parameters for the device, by
 747  * removing it and then adding it.  That is, the second time around,
 748  * the driver would have certain fields, that it is looking at, set.
 749  * Finally we initialize the kobj so that the device can be added to
 750  * the system at registration time.  Devices directly attached to a HA
 751  * port, have no parents.  All other devices do, and should have their
 752  * "parent" pointer set appropriately before calling this function.
 753  */
 754 int sas_discover_sata(struct domain_device *dev)
 755 {
 756         int res;
 757
 758         sas_get_ata_command_set(dev);
 759
 760         res = sas_notify_lldd_dev_found(dev);
 761         if (res)
 762                 return res;
 763
 764         switch (dev->dev_type) {
 765         case SATA_DEV:
 766                 res = sas_discover_sata_dev(dev);
 767                 break;
 768         case SATA_PM:
 769                 res = sas_discover_sata_pm(dev);
 770                 break;
 771         default:
 772                 break;
 773         }
 774         sas_notify_lldd_dev_gone(dev);
 775         if (!res) {
 776                 sas_notify_lldd_dev_found(dev);
 777                 res = sas_rphy_add(dev->rphy);
 778         }
 779
 780         return res;
 781 }