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                                     __func__, 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", __func__,
 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 void sas_ata_phy_reset(struct ata_port *ap)
 237 {
 238         struct domain_device *dev = ap->private_data;
 239         struct sas_internal *i =
 240                 to_sas_internal(dev->port->ha->core.shost->transportt);
 241         int res = TMF_RESP_FUNC_FAILED;
 242
 243         if (i->dft->lldd_I_T_nexus_reset)
 244                 res = i->dft->lldd_I_T_nexus_reset(dev);
 245
 246         if (res != TMF_RESP_FUNC_COMPLETE)
 247                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
 248
 249         switch (dev->sata_dev.command_set) {
 250                 case ATA_COMMAND_SET:
 251                         SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 252                         ap->link.device[0].class = ATA_DEV_ATA;
 253                         break;
 254                 case ATAPI_COMMAND_SET:
 255                         SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 256                         ap->link.device[0].class = ATA_DEV_ATAPI;
 257                         break;
 258                 default:
 259                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 260                                     __func__,
 261                                     dev->sata_dev.command_set);
 262                         ap->link.device[0].class = ATA_DEV_UNKNOWN;
 263                         break;
 264         }
 265
 266         ap->cbl = ATA_CBL_SATA;
 267 }
 268
 269 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 270 {
 271         if (qc->flags & ATA_QCFLAG_FAILED)
 272                 qc->err_mask |= AC_ERR_OTHER;
 273
 274         if (qc->err_mask) {
 275                 /*
 276                  * Find the sas_task and kill it.  By this point,
 277                  * libata has decided to kill the qc, so we needn't
 278                  * bother with sas_ata_task_done.  But we still
 279                  * ought to abort the task.
 280                  */
 281                 struct sas_task *task = qc->lldd_task;
 282                 unsigned long flags;
 283
 284                 qc->lldd_task = NULL;
 285                 if (task) {
 286                         /* Should this be a AT(API) device reset? */
 287                         spin_lock_irqsave(&task->task_state_lock, flags);
 288                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 289                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 290
 291                         task->uldd_task = NULL;
 292                         __sas_task_abort(task);
 293                 }
 294         }
 295 }
 296
 297 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
 298                               u32 val)
 299 {
 300         struct domain_device *dev = link->ap->private_data;
 301
 302         SAS_DPRINTK("STUB %s\n", __func__);
 303         switch (sc_reg_in) {
 304                 case SCR_STATUS:
 305                         dev->sata_dev.sstatus = val;
 306                         break;
 307                 case SCR_CONTROL:
 308                         dev->sata_dev.scontrol = val;
 309                         break;
 310                 case SCR_ERROR:
 311                         dev->sata_dev.serror = val;
 312                         break;
 313                 case SCR_ACTIVE:
 314                         dev->sata_dev.ap->link.sactive = val;
 315                         break;
 316                 default:
 317                         return -EINVAL;
 318         }
 319         return 0;
 320 }
 321
 322 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 323                             u32 *val)
 324 {
 325         struct domain_device *dev = link->ap->private_data;
 326
 327         SAS_DPRINTK("STUB %s\n", __func__);
 328         switch (sc_reg_in) {
 329                 case SCR_STATUS:
 330                         *val = dev->sata_dev.sstatus;
 331                         return 0;
 332                 case SCR_CONTROL:
 333                         *val = dev->sata_dev.scontrol;
 334                         return 0;
 335                 case SCR_ERROR:
 336                         *val = dev->sata_dev.serror;
 337                         return 0;
 338                 case SCR_ACTIVE:
 339                         *val = dev->sata_dev.ap->link.sactive;
 340                         return 0;
 341                 default:
 342                         return -EINVAL;
 343         }
 344 }
 345
 346 static struct ata_port_operations sas_sata_ops = {
 347         .phy_reset              = sas_ata_phy_reset,
 348         .post_internal_cmd      = sas_ata_post_internal,
 349         .qc_prep                = ata_noop_qc_prep,
 350         .qc_issue               = sas_ata_qc_issue,
 351         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 352         .port_start             = ata_sas_port_start,
 353         .port_stop              = ata_sas_port_stop,
 354         .scr_read               = sas_ata_scr_read,
 355         .scr_write              = sas_ata_scr_write
 356 };
 357
 358 static struct ata_port_info sata_port_info = {
 359         .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 360                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 361         .pio_mask = 0x1f, /* PIO0-4 */
 362         .mwdma_mask = 0x07, /* MWDMA0-2 */
 363         .udma_mask = ATA_UDMA6,
 364         .port_ops = &sas_sata_ops
 365 };
 366
 367 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 368                                struct scsi_target *starget)
 369 {
 370         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 371         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 372         struct ata_port *ap;
 373
 374         ata_host_init(&found_dev->sata_dev.ata_host,
 375                       ha->dev,
 376                       sata_port_info.flags,
 377                       &sas_sata_ops);
 378         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 379                                 &sata_port_info,
 380                                 shost);
 381         if (!ap) {
 382                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 383                 return -ENODEV;
 384         }
 385
 386         ap->private_data = found_dev;
 387         ap->cbl = ATA_CBL_SATA;
 388         ap->scsi_host = shost;
 389         found_dev->sata_dev.ap = ap;
 390
 391         return 0;
 392 }
 393
 394 void sas_ata_task_abort(struct sas_task *task)
 395 {
 396         struct ata_queued_cmd *qc = task->uldd_task;
 397         struct completion *waiting;
 398
 399         /* Bounce SCSI-initiated commands to the SCSI EH */
 400         if (qc->scsicmd) {
 401                 blk_abort_request(qc->scsicmd->request);
 402                 scsi_schedule_eh(qc->scsicmd->device->host);
 403                 return;
 404         }
 405
 406         /* Internal command, fake a timeout and complete. */
 407         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 408         qc->flags |= ATA_QCFLAG_FAILED;
 409         qc->err_mask |= AC_ERR_TIMEOUT;
 410         waiting = qc->private_data;
 411         complete(waiting);
 412 }
 413
 414 static void sas_task_timedout(unsigned long _task)
 415 {
 416         struct sas_task *task = (void *) _task;
 417         unsigned long flags;
 418
 419         spin_lock_irqsave(&task->task_state_lock, flags);
 420         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 421                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 422         spin_unlock_irqrestore(&task->task_state_lock, flags);
 423
 424         complete(&task->completion);
 425 }
 426
 427 static void sas_disc_task_done(struct sas_task *task)
 428 {
 429         if (!del_timer(&task->timer))
 430                 return;
 431         complete(&task->completion);
 432 }
 433
 434 #define SAS_DEV_TIMEOUT 10
 435
 436 /**
 437  * sas_execute_task -- Basic task processing for discovery
 438  * @task: the task to be executed
 439  * @buffer: pointer to buffer to do I/O
 440  * @size: size of @buffer
 441  * @dma_dir: DMA direction.  DMA_xxx
 442  */
 443 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 444                             enum dma_data_direction dma_dir)
 445 {
 446         int res = 0;
 447         struct scatterlist *scatter = NULL;
 448         struct task_status_struct *ts = &task->task_status;
 449         int num_scatter = 0;
 450         int retries = 0;
 451         struct sas_internal *i =
 452                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 453
 454         if (dma_dir != DMA_NONE) {
 455                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 456                 if (!scatter)
 457                         goto out;
 458
 459                 sg_init_one(scatter, buffer, size);
 460                 num_scatter = 1;
 461         }
 462
 463         task->task_proto = task->dev->tproto;
 464         task->scatter = scatter;
 465         task->num_scatter = num_scatter;
 466         task->total_xfer_len = size;
 467         task->data_dir = dma_dir;
 468         task->task_done = sas_disc_task_done;
 469         if (dma_dir != DMA_NONE &&
 470             sas_protocol_ata(task->task_proto)) {
 471                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 472                                                task->scatter,
 473                                                task->num_scatter,
 474                                                task->data_dir);
 475         }
 476
 477         for (retries = 0; retries < 5; retries++) {
 478                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 479                 init_completion(&task->completion);
 480
 481                 task->timer.data = (unsigned long) task;
 482                 task->timer.function = sas_task_timedout;
 483                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 484                 add_timer(&task->timer);
 485
 486                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 487                 if (res) {
 488                         del_timer(&task->timer);
 489                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 490                                     res);
 491                         goto ex_err;
 492                 }
 493                 wait_for_completion(&task->completion);
 494                 res = -ECOMM;
 495                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 496                         int res2;
 497                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 498                                     task->task_state_flags);
 499                         res2 = i->dft->lldd_abort_task(task);
 500                         SAS_DPRINTK("came back from abort task\n");
 501                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 502                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 503                                         continue; /* Retry the task */
 504                                 else
 505                                         goto ex_err;
 506                         }
 507                 }
 508                 if (task->task_status.stat == SAM_BUSY ||
 509                            task->task_status.stat == SAM_TASK_SET_FULL ||
 510                            task->task_status.stat == SAS_QUEUE_FULL) {
 511                         SAS_DPRINTK("task: q busy, sleeping...\n");
 512                         schedule_timeout_interruptible(HZ);
 513                 } else if (task->task_status.stat == SAM_CHECK_COND) {
 514                         struct scsi_sense_hdr shdr;
 515
 516                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 517                                                   &shdr)) {
 518                                 SAS_DPRINTK("couldn't normalize sense\n");
 519                                 continue;
 520                         }
 521                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 522                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 523                              shdr.ascq == 1)) {
 524                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 525                                             "powering up or not ready yet, "
 526                                             "sleeping...\n",
 527                                             SAS_ADDR(task->dev->sas_addr),
 528                                             SAS_ADDR(task->ssp_task.LUN));
 529
 530                                 schedule_timeout_interruptible(5*HZ);
 531                         } else if (shdr.sense_key == 1) {
 532                                 res = 0;
 533                                 break;
 534                         } else if (shdr.sense_key == 5) {
 535                                 break;
 536                         } else {
 537                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 538                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 539                                             "\n",
 540                                             SAS_ADDR(task->dev->sas_addr),
 541                                             SAS_ADDR(task->ssp_task.LUN),
 542                                             shdr.sense_key,
 543                                             shdr.asc, shdr.ascq);
 544                         }
 545                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 546                            task->task_status.stat != SAM_GOOD) {
 547                         SAS_DPRINTK("task finished with resp:0x%x, "
 548                                     "stat:0x%x\n",
 549                                     task->task_status.resp,
 550                                     task->task_status.stat);
 551                         goto ex_err;
 552                 } else {
 553                         res = 0;
 554                         break;
 555                 }
 556         }
 557 ex_err:
 558         if (dma_dir != DMA_NONE) {
 559                 if (sas_protocol_ata(task->task_proto))
 560                         dma_unmap_sg(task->dev->port->ha->dev,
 561                                      task->scatter, task->num_scatter,
 562                                      task->data_dir);
 563                 kfree(scatter);
 564         }
 565 out:
 566         return res;
 567 }
 568
 569 /* ---------- SATA ---------- */
 570
 571 static void sas_get_ata_command_set(struct domain_device *dev)
 572 {
 573         struct dev_to_host_fis *fis =
 574                 (struct dev_to_host_fis *) dev->frame_rcvd;
 575
 576         if ((fis->sector_count == 1 && /* ATA */
 577              fis->lbal         == 1 &&
 578              fis->lbam         == 0 &&
 579              fis->lbah         == 0 &&
 580              fis->device       == 0)
 581             ||
 582             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 583              fis->lbal         == 0 &&
 584              fis->lbam         == 0xCE &&
 585              fis->lbah         == 0xAA &&
 586              (fis->device & ~0x10) == 0))
 587
 588                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 589
 590         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 591                   fis->lbal             == 1 &&
 592                   fis->byte_count_low   == 0x14 &&
 593                   fis->byte_count_high  == 0xEB &&
 594                   (fis->device & ~0x10) == 0))
 595
 596                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 597
 598         else if ((fis->sector_count == 1 && /* SEMB */
 599                   fis->lbal         == 1 &&
 600                   fis->lbam         == 0x3C &&
 601                   fis->lbah         == 0xC3 &&
 602                   fis->device       == 0)
 603                 ||
 604                  (fis->interrupt_reason == 1 && /* SATA PM */
 605                   fis->lbal             == 1 &&
 606                   fis->byte_count_low   == 0x69 &&
 607                   fis->byte_count_high  == 0x96 &&
 608                   (fis->device & ~0x10) == 0))
 609
 610                 /* Treat it as a superset? */
 611                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 612 }
 613
 614 /**
 615  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 616  * @dev: the device to send the command to
 617  * @command: the command register
 618  * @features: the features register
 619  * @buffer: pointer to buffer to do I/O
 620  * @size: size of @buffer
 621  * @dma_dir: DMA direction.  DMA_xxx
 622  */
 623 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 624                              u8 features, void *buffer, int size,
 625                              enum dma_data_direction dma_dir)
 626 {
 627         int res = 0;
 628         struct sas_task *task;
 629         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 630                 &dev->frame_rcvd[0];
 631
 632         res = -ENOMEM;
 633         task = sas_alloc_task(GFP_KERNEL);
 634         if (!task)
 635                 goto out;
 636
 637         task->dev = dev;
 638
 639         task->ata_task.fis.fis_type = 0x27;
 640         task->ata_task.fis.command = command;
 641         task->ata_task.fis.features = features;
 642         task->ata_task.fis.device = d2h_fis->device;
 643         task->ata_task.retry_count = 1;
 644
 645         res = sas_execute_task(task, buffer, size, dma_dir);
 646
 647         sas_free_task(task);
 648 out:
 649         return res;
 650 }
 651
 652 #define ATA_IDENTIFY_DEV         0xEC
 653 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 654 #define ATA_SET_FEATURES         0xEF
 655 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 656
 657 /**
 658  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 659  * @dev: STP/SATA device of interest (ATA/ATAPI)
 660  *
 661  * The LLDD has already been notified of this device, so that we can
 662  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 663  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 664  * performance for this device.
 665  */
 666 static int sas_discover_sata_dev(struct domain_device *dev)
 667 {
 668         int     res;
 669         __le16  *identify_x;
 670         u8      command;
 671
 672         identify_x = kzalloc(512, GFP_KERNEL);
 673         if (!identify_x)
 674                 return -ENOMEM;
 675
 676         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 677                 dev->sata_dev.identify_device = identify_x;
 678                 command = ATA_IDENTIFY_DEV;
 679         } else {
 680                 dev->sata_dev.identify_packet_device = identify_x;
 681                 command = ATA_IDENTIFY_PACKET_DEV;
 682         }
 683
 684         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 685                                 DMA_FROM_DEVICE);
 686         if (res)
 687                 goto out_err;
 688
 689         /* lives on the media? */
 690         if (le16_to_cpu(identify_x[0]) & 4) {
 691                 /* incomplete response */
 692                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 693                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 694                 if (!(identify_x[83] & cpu_to_le16(1<<6)))
 695                         goto cont1;
 696                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 697                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 698                                         NULL, 0, DMA_NONE);
 699                 if (res)
 700                         goto cont1;
 701
 702                 schedule_timeout_interruptible(5*HZ); /* More time? */
 703                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 704                                         DMA_FROM_DEVICE);
 705                 if (res)
 706                         goto out_err;
 707         }
 708 cont1:
 709         /* XXX Hint: register this SATA device with SATL.
 710            When this returns, dev->sata_dev->lu is alive and
 711            present.
 712         sas_satl_register_dev(dev);
 713         */
 714
 715         sas_fill_in_rphy(dev, dev->rphy);
 716
 717         return 0;
 718 out_err:
 719         dev->sata_dev.identify_packet_device = NULL;
 720         dev->sata_dev.identify_device = NULL;
 721         kfree(identify_x);
 722         return res;
 723 }
 724
 725 static int sas_discover_sata_pm(struct domain_device *dev)
 726 {
 727         return -ENODEV;
 728 }
 729
 730 /**
 731  * sas_discover_sata -- discover an STP/SATA domain device
 732  * @dev: pointer to struct domain_device of interest
 733  *
 734  * First we notify the LLDD of this device, so we can send frames to
 735  * it.  Then depending on the type of device we call the appropriate
 736  * discover functions.  Once device discover is done, we notify the
 737  * LLDD so that it can fine-tune its parameters for the device, by
 738  * removing it and then adding it.  That is, the second time around,
 739  * the driver would have certain fields, that it is looking at, set.
 740  * Finally we initialize the kobj so that the device can be added to
 741  * the system at registration time.  Devices directly attached to a HA
 742  * port, have no parents.  All other devices do, and should have their
 743  * "parent" pointer set appropriately before calling this function.
 744  */
 745 int sas_discover_sata(struct domain_device *dev)
 746 {
 747         int res;
 748
 749         sas_get_ata_command_set(dev);
 750
 751         res = sas_notify_lldd_dev_found(dev);
 752         if (res)
 753                 return res;
 754
 755         switch (dev->dev_type) {
 756         case SATA_DEV:
 757                 res = sas_discover_sata_dev(dev);
 758                 break;
 759         case SATA_PM:
 760                 res = sas_discover_sata_pm(dev);
 761                 break;
 762         default:
 763                 break;
 764         }
 765         sas_notify_lldd_dev_gone(dev);
 766         if (!res) {
 767                 sas_notify_lldd_dev_found(dev);
 768                 res = sas_rphy_add(dev->rphy);
 769         }
 770
 771         return res;
 772 }