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 SAM_CHECK_COND:
  75                 case SAS_OPEN_TO:
  76                 case SAS_OPEN_REJECT:
  77                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  78                                     __func__, ts->stat);
  79                         return AC_ERR_OTHER;
  80
  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_GOOD) {
 111                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 112                 qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 113                 dev->sata_dev.sstatus = resp->sstatus;
 114                 dev->sata_dev.serror = resp->serror;
 115                 dev->sata_dev.scontrol = resp->scontrol;
 116         } else if (stat->stat != SAM_STAT_GOOD) {
 117                 ac = sas_to_ata_err(stat);
 118                 if (ac) {
 119                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 120                                     stat->stat);
 121                         /* We saw a SAS error. Send a vague error. */
 122                         qc->err_mask = ac;
 123                         dev->sata_dev.tf.feature = 0x04; /* status err */
 124                         dev->sata_dev.tf.command = ATA_ERR;
 125                 }
 126         }
 127
 128         qc->lldd_task = NULL;
 129         if (qc->scsicmd)
 130                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 131         ata_qc_complete(qc);
 132         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 133
 134         /*
 135          * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 136          * flag is set, then we must have come in via the libsas EH
 137          * functions.  When we exit this function, we need to put the
 138          * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 139          * call cleans up the libata side of things but we're protected
 140          * from the scsi_cmnd going away because the scsi_cmnd is owned
 141          * by the EH, making libata's call to scsi_done a NOP.
 142          */
 143         spin_lock_irqsave(&task->task_state_lock, flags);
 144         if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 145                 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 146         spin_unlock_irqrestore(&task->task_state_lock, flags);
 147
 148 qc_already_gone:
 149         list_del_init(&task->list);
 150         sas_free_task(task);
 151 }
 152
 153 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 154 {
 155         int res;
 156         struct sas_task *task;
 157         struct domain_device *dev = qc->ap->private_data;
 158         struct sas_ha_struct *sas_ha = dev->port->ha;
 159         struct Scsi_Host *host = sas_ha->core.shost;
 160         struct sas_internal *i = to_sas_internal(host->transportt);
 161         struct scatterlist *sg;
 162         unsigned int xfer = 0;
 163         unsigned int si;
 164
 165         task = sas_alloc_task(GFP_ATOMIC);
 166         if (!task)
 167                 return AC_ERR_SYSTEM;
 168         task->dev = dev;
 169         task->task_proto = SAS_PROTOCOL_STP;
 170         task->task_done = sas_ata_task_done;
 171
 172         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 173             qc->tf.command == ATA_CMD_FPDMA_READ) {
 174                 /* Need to zero out the tag libata assigned us */
 175                 qc->tf.nsect = 0;
 176         }
 177
 178         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 179         task->uldd_task = qc;
 180         if (ata_is_atapi(qc->tf.protocol)) {
 181                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 182                 task->total_xfer_len = qc->nbytes;
 183                 task->num_scatter = qc->n_elem;
 184         } else {
 185                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 186                         xfer += sg->length;
 187
 188                 task->total_xfer_len = xfer;
 189                 task->num_scatter = si;
 190         }
 191
 192         task->data_dir = qc->dma_dir;
 193         task->scatter = qc->sg;
 194         task->ata_task.retry_count = 1;
 195         task->task_state_flags = SAS_TASK_STATE_PENDING;
 196         qc->lldd_task = task;
 197
 198         switch (qc->tf.protocol) {
 199         case ATA_PROT_NCQ:
 200                 task->ata_task.use_ncq = 1;
 201                 /* fall through */
 202         case ATAPI_PROT_DMA:
 203         case ATA_PROT_DMA:
 204                 task->ata_task.dma_xfer = 1;
 205                 break;
 206         }
 207
 208         if (qc->scsicmd)
 209                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 210
 211         if (sas_ha->lldd_max_execute_num < 2)
 212                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 213         else
 214                 res = sas_queue_up(task);
 215
 216         /* Examine */
 217         if (res) {
 218                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 219
 220                 if (qc->scsicmd)
 221                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 222                 sas_free_task(task);
 223                 return AC_ERR_SYSTEM;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 230 {
 231         struct domain_device *dev = qc->ap->private_data;
 232
 233         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 234         return true;
 235 }
 236
 237 static void sas_ata_phy_reset(struct ata_port *ap)
 238 {
 239         struct domain_device *dev = ap->private_data;
 240         struct sas_internal *i =
 241                 to_sas_internal(dev->port->ha->core.shost->transportt);
 242         int res = TMF_RESP_FUNC_FAILED;
 243
 244         if (i->dft->lldd_I_T_nexus_reset)
 245                 res = i->dft->lldd_I_T_nexus_reset(dev);
 246
 247         if (res != TMF_RESP_FUNC_COMPLETE)
 248                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
 249
 250         switch (dev->sata_dev.command_set) {
 251                 case ATA_COMMAND_SET:
 252                         SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 253                         ap->link.device[0].class = ATA_DEV_ATA;
 254                         break;
 255                 case ATAPI_COMMAND_SET:
 256                         SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 257                         ap->link.device[0].class = ATA_DEV_ATAPI;
 258                         break;
 259                 default:
 260                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 261                                     __func__,
 262                                     dev->sata_dev.command_set);
 263                         ap->link.device[0].class = ATA_DEV_UNKNOWN;
 264                         break;
 265         }
 266
 267         ap->cbl = ATA_CBL_SATA;
 268 }
 269
 270 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 271 {
 272         if (qc->flags & ATA_QCFLAG_FAILED)
 273                 qc->err_mask |= AC_ERR_OTHER;
 274
 275         if (qc->err_mask) {
 276                 /*
 277                  * Find the sas_task and kill it.  By this point,
 278                  * libata has decided to kill the qc, so we needn't
 279                  * bother with sas_ata_task_done.  But we still
 280                  * ought to abort the task.
 281                  */
 282                 struct sas_task *task = qc->lldd_task;
 283                 unsigned long flags;
 284
 285                 qc->lldd_task = NULL;
 286                 if (task) {
 287                         /* Should this be a AT(API) device reset? */
 288                         spin_lock_irqsave(&task->task_state_lock, flags);
 289                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 290                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 291
 292                         task->uldd_task = NULL;
 293                         __sas_task_abort(task);
 294                 }
 295         }
 296 }
 297
 298 static int sas_ata_scr_write(struct ata_link *link, unsigned int sc_reg_in,
 299                               u32 val)
 300 {
 301         struct domain_device *dev = link->ap->private_data;
 302
 303         SAS_DPRINTK("STUB %s\n", __func__);
 304         switch (sc_reg_in) {
 305                 case SCR_STATUS:
 306                         dev->sata_dev.sstatus = val;
 307                         break;
 308                 case SCR_CONTROL:
 309                         dev->sata_dev.scontrol = val;
 310                         break;
 311                 case SCR_ERROR:
 312                         dev->sata_dev.serror = val;
 313                         break;
 314                 case SCR_ACTIVE:
 315                         dev->sata_dev.ap->link.sactive = val;
 316                         break;
 317                 default:
 318                         return -EINVAL;
 319         }
 320         return 0;
 321 }
 322
 323 static int sas_ata_scr_read(struct ata_link *link, unsigned int sc_reg_in,
 324                             u32 *val)
 325 {
 326         struct domain_device *dev = link->ap->private_data;
 327
 328         SAS_DPRINTK("STUB %s\n", __func__);
 329         switch (sc_reg_in) {
 330                 case SCR_STATUS:
 331                         *val = dev->sata_dev.sstatus;
 332                         return 0;
 333                 case SCR_CONTROL:
 334                         *val = dev->sata_dev.scontrol;
 335                         return 0;
 336                 case SCR_ERROR:
 337                         *val = dev->sata_dev.serror;
 338                         return 0;
 339                 case SCR_ACTIVE:
 340                         *val = dev->sata_dev.ap->link.sactive;
 341                         return 0;
 342                 default:
 343                         return -EINVAL;
 344         }
 345 }
 346
 347 static struct ata_port_operations sas_sata_ops = {
 348         .phy_reset              = sas_ata_phy_reset,
 349         .post_internal_cmd      = sas_ata_post_internal,
 350         .qc_prep                = ata_noop_qc_prep,
 351         .qc_issue               = sas_ata_qc_issue,
 352         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 353         .port_start             = ata_sas_port_start,
 354         .port_stop              = ata_sas_port_stop,
 355         .scr_read               = sas_ata_scr_read,
 356         .scr_write              = sas_ata_scr_write
 357 };
 358
 359 static struct ata_port_info sata_port_info = {
 360         .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 361                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 362         .pio_mask = 0x1f, /* PIO0-4 */
 363         .mwdma_mask = 0x07, /* MWDMA0-2 */
 364         .udma_mask = ATA_UDMA6,
 365         .port_ops = &sas_sata_ops
 366 };
 367
 368 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 369                                struct scsi_target *starget)
 370 {
 371         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 372         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 373         struct ata_port *ap;
 374
 375         ata_host_init(&found_dev->sata_dev.ata_host,
 376                       ha->dev,
 377                       sata_port_info.flags,
 378                       &sas_sata_ops);
 379         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 380                                 &sata_port_info,
 381                                 shost);
 382         if (!ap) {
 383                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 384                 return -ENODEV;
 385         }
 386
 387         ap->private_data = found_dev;
 388         ap->cbl = ATA_CBL_SATA;
 389         ap->scsi_host = shost;
 390         found_dev->sata_dev.ap = ap;
 391
 392         return 0;
 393 }
 394
 395 void sas_ata_task_abort(struct sas_task *task)
 396 {
 397         struct ata_queued_cmd *qc = task->uldd_task;
 398         struct completion *waiting;
 399
 400         /* Bounce SCSI-initiated commands to the SCSI EH */
 401         if (qc->scsicmd) {
 402                 struct request_queue *q = qc->scsicmd->device->request_queue;
 403                 unsigned long flags;
 404
 405                 spin_lock_irqsave(q->queue_lock, flags);
 406                 blk_abort_request(qc->scsicmd->request);
 407                 spin_unlock_irqrestore(q->queue_lock, flags);
 408                 scsi_schedule_eh(qc->scsicmd->device->host);
 409                 return;
 410         }
 411
 412         /* Internal command, fake a timeout and complete. */
 413         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 414         qc->flags |= ATA_QCFLAG_FAILED;
 415         qc->err_mask |= AC_ERR_TIMEOUT;
 416         waiting = qc->private_data;
 417         complete(waiting);
 418 }
 419
 420 static void sas_task_timedout(unsigned long _task)
 421 {
 422         struct sas_task *task = (void *) _task;
 423         unsigned long flags;
 424
 425         spin_lock_irqsave(&task->task_state_lock, flags);
 426         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 427                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 428         spin_unlock_irqrestore(&task->task_state_lock, flags);
 429
 430         complete(&task->completion);
 431 }
 432
 433 static void sas_disc_task_done(struct sas_task *task)
 434 {
 435         if (!del_timer(&task->timer))
 436                 return;
 437         complete(&task->completion);
 438 }
 439
 440 #define SAS_DEV_TIMEOUT 10
 441
 442 /**
 443  * sas_execute_task -- Basic task processing for discovery
 444  * @task: the task to be executed
 445  * @buffer: pointer to buffer to do I/O
 446  * @size: size of @buffer
 447  * @dma_dir: DMA direction.  DMA_xxx
 448  */
 449 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 450                             enum dma_data_direction dma_dir)
 451 {
 452         int res = 0;
 453         struct scatterlist *scatter = NULL;
 454         struct task_status_struct *ts = &task->task_status;
 455         int num_scatter = 0;
 456         int retries = 0;
 457         struct sas_internal *i =
 458                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 459
 460         if (dma_dir != DMA_NONE) {
 461                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 462                 if (!scatter)
 463                         goto out;
 464
 465                 sg_init_one(scatter, buffer, size);
 466                 num_scatter = 1;
 467         }
 468
 469         task->task_proto = task->dev->tproto;
 470         task->scatter = scatter;
 471         task->num_scatter = num_scatter;
 472         task->total_xfer_len = size;
 473         task->data_dir = dma_dir;
 474         task->task_done = sas_disc_task_done;
 475         if (dma_dir != DMA_NONE &&
 476             sas_protocol_ata(task->task_proto)) {
 477                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 478                                                task->scatter,
 479                                                task->num_scatter,
 480                                                task->data_dir);
 481         }
 482
 483         for (retries = 0; retries < 5; retries++) {
 484                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 485                 init_completion(&task->completion);
 486
 487                 task->timer.data = (unsigned long) task;
 488                 task->timer.function = sas_task_timedout;
 489                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 490                 add_timer(&task->timer);
 491
 492                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 493                 if (res) {
 494                         del_timer(&task->timer);
 495                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 496                                     res);
 497                         goto ex_err;
 498                 }
 499                 wait_for_completion(&task->completion);
 500                 res = -ECOMM;
 501                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 502                         int res2;
 503                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 504                                     task->task_state_flags);
 505                         res2 = i->dft->lldd_abort_task(task);
 506                         SAS_DPRINTK("came back from abort task\n");
 507                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 508                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 509                                         continue; /* Retry the task */
 510                                 else
 511                                         goto ex_err;
 512                         }
 513                 }
 514                 if (task->task_status.stat == SAM_BUSY ||
 515                            task->task_status.stat == SAM_TASK_SET_FULL ||
 516                            task->task_status.stat == SAS_QUEUE_FULL) {
 517                         SAS_DPRINTK("task: q busy, sleeping...\n");
 518                         schedule_timeout_interruptible(HZ);
 519                 } else if (task->task_status.stat == SAM_CHECK_COND) {
 520                         struct scsi_sense_hdr shdr;
 521
 522                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 523                                                   &shdr)) {
 524                                 SAS_DPRINTK("couldn't normalize sense\n");
 525                                 continue;
 526                         }
 527                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 528                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 529                              shdr.ascq == 1)) {
 530                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 531                                             "powering up or not ready yet, "
 532                                             "sleeping...\n",
 533                                             SAS_ADDR(task->dev->sas_addr),
 534                                             SAS_ADDR(task->ssp_task.LUN));
 535
 536                                 schedule_timeout_interruptible(5*HZ);
 537                         } else if (shdr.sense_key == 1) {
 538                                 res = 0;
 539                                 break;
 540                         } else if (shdr.sense_key == 5) {
 541                                 break;
 542                         } else {
 543                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 544                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 545                                             "\n",
 546                                             SAS_ADDR(task->dev->sas_addr),
 547                                             SAS_ADDR(task->ssp_task.LUN),
 548                                             shdr.sense_key,
 549                                             shdr.asc, shdr.ascq);
 550                         }
 551                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 552                            task->task_status.stat != SAM_GOOD) {
 553                         SAS_DPRINTK("task finished with resp:0x%x, "
 554                                     "stat:0x%x\n",
 555                                     task->task_status.resp,
 556                                     task->task_status.stat);
 557                         goto ex_err;
 558                 } else {
 559                         res = 0;
 560                         break;
 561                 }
 562         }
 563 ex_err:
 564         if (dma_dir != DMA_NONE) {
 565                 if (sas_protocol_ata(task->task_proto))
 566                         dma_unmap_sg(task->dev->port->ha->dev,
 567                                      task->scatter, task->num_scatter,
 568                                      task->data_dir);
 569                 kfree(scatter);
 570         }
 571 out:
 572         return res;
 573 }
 574
 575 /* ---------- SATA ---------- */
 576
 577 static void sas_get_ata_command_set(struct domain_device *dev)
 578 {
 579         struct dev_to_host_fis *fis =
 580                 (struct dev_to_host_fis *) dev->frame_rcvd;
 581
 582         if ((fis->sector_count == 1 && /* ATA */
 583              fis->lbal         == 1 &&
 584              fis->lbam         == 0 &&
 585              fis->lbah         == 0 &&
 586              fis->device       == 0)
 587             ||
 588             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 589              fis->lbal         == 0 &&
 590              fis->lbam         == 0xCE &&
 591              fis->lbah         == 0xAA &&
 592              (fis->device & ~0x10) == 0))
 593
 594                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 595
 596         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 597                   fis->lbal             == 1 &&
 598                   fis->byte_count_low   == 0x14 &&
 599                   fis->byte_count_high  == 0xEB &&
 600                   (fis->device & ~0x10) == 0))
 601
 602                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 603
 604         else if ((fis->sector_count == 1 && /* SEMB */
 605                   fis->lbal         == 1 &&
 606                   fis->lbam         == 0x3C &&
 607                   fis->lbah         == 0xC3 &&
 608                   fis->device       == 0)
 609                 ||
 610                  (fis->interrupt_reason == 1 && /* SATA PM */
 611                   fis->lbal             == 1 &&
 612                   fis->byte_count_low   == 0x69 &&
 613                   fis->byte_count_high  == 0x96 &&
 614                   (fis->device & ~0x10) == 0))
 615
 616                 /* Treat it as a superset? */
 617                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 618 }
 619
 620 /**
 621  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 622  * @dev: the device to send the command to
 623  * @command: the command register
 624  * @features: the features register
 625  * @buffer: pointer to buffer to do I/O
 626  * @size: size of @buffer
 627  * @dma_dir: DMA direction.  DMA_xxx
 628  */
 629 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 630                              u8 features, void *buffer, int size,
 631                              enum dma_data_direction dma_dir)
 632 {
 633         int res = 0;
 634         struct sas_task *task;
 635         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 636                 &dev->frame_rcvd[0];
 637
 638         res = -ENOMEM;
 639         task = sas_alloc_task(GFP_KERNEL);
 640         if (!task)
 641                 goto out;
 642
 643         task->dev = dev;
 644
 645         task->ata_task.fis.fis_type = 0x27;
 646         task->ata_task.fis.command = command;
 647         task->ata_task.fis.features = features;
 648         task->ata_task.fis.device = d2h_fis->device;
 649         task->ata_task.retry_count = 1;
 650
 651         res = sas_execute_task(task, buffer, size, dma_dir);
 652
 653         sas_free_task(task);
 654 out:
 655         return res;
 656 }
 657
 658 #define ATA_IDENTIFY_DEV         0xEC
 659 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 660 #define ATA_SET_FEATURES         0xEF
 661 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 662
 663 /**
 664  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 665  * @dev: STP/SATA device of interest (ATA/ATAPI)
 666  *
 667  * The LLDD has already been notified of this device, so that we can
 668  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 669  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 670  * performance for this device.
 671  */
 672 static int sas_discover_sata_dev(struct domain_device *dev)
 673 {
 674         int     res;
 675         __le16  *identify_x;
 676         u8      command;
 677
 678         identify_x = kzalloc(512, GFP_KERNEL);
 679         if (!identify_x)
 680                 return -ENOMEM;
 681
 682         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 683                 dev->sata_dev.identify_device = identify_x;
 684                 command = ATA_IDENTIFY_DEV;
 685         } else {
 686                 dev->sata_dev.identify_packet_device = identify_x;
 687                 command = ATA_IDENTIFY_PACKET_DEV;
 688         }
 689
 690         res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 691                                 DMA_FROM_DEVICE);
 692         if (res)
 693                 goto out_err;
 694
 695         /* lives on the media? */
 696         if (le16_to_cpu(identify_x[0]) & 4) {
 697                 /* incomplete response */
 698                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 699                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 700                 if (!(identify_x[83] & cpu_to_le16(1<<6)))
 701                         goto cont1;
 702                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 703                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 704                                         NULL, 0, DMA_NONE);
 705                 if (res)
 706                         goto cont1;
 707
 708                 schedule_timeout_interruptible(5*HZ); /* More time? */
 709                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 710                                         DMA_FROM_DEVICE);
 711                 if (res)
 712                         goto out_err;
 713         }
 714 cont1:
 715         /* XXX Hint: register this SATA device with SATL.
 716            When this returns, dev->sata_dev->lu is alive and
 717            present.
 718         sas_satl_register_dev(dev);
 719         */
 720
 721         sas_fill_in_rphy(dev, dev->rphy);
 722
 723         return 0;
 724 out_err:
 725         dev->sata_dev.identify_packet_device = NULL;
 726         dev->sata_dev.identify_device = NULL;
 727         kfree(identify_x);
 728         return res;
 729 }
 730
 731 static int sas_discover_sata_pm(struct domain_device *dev)
 732 {
 733         return -ENODEV;
 734 }
 735
 736 /**
 737  * sas_discover_sata -- discover an STP/SATA domain device
 738  * @dev: pointer to struct domain_device of interest
 739  *
 740  * First we notify the LLDD of this device, so we can send frames to
 741  * it.  Then depending on the type of device we call the appropriate
 742  * discover functions.  Once device discover is done, we notify the
 743  * LLDD so that it can fine-tune its parameters for the device, by
 744  * removing it and then adding it.  That is, the second time around,
 745  * the driver would have certain fields, that it is looking at, set.
 746  * Finally we initialize the kobj so that the device can be added to
 747  * the system at registration time.  Devices directly attached to a HA
 748  * port, have no parents.  All other devices do, and should have their
 749  * "parent" pointer set appropriately before calling this function.
 750  */
 751 int sas_discover_sata(struct domain_device *dev)
 752 {
 753         int res;
 754
 755         sas_get_ata_command_set(dev);
 756
 757         res = sas_notify_lldd_dev_found(dev);
 758         if (res)
 759                 return res;
 760
 761         switch (dev->dev_type) {
 762         case SATA_DEV:
 763                 res = sas_discover_sata_dev(dev);
 764                 break;
 765         case SATA_PM:
 766                 res = sas_discover_sata_pm(dev);
 767                 break;
 768         default:
 769                 break;
 770         }
 771         sas_notify_lldd_dev_gone(dev);
 772         if (!res) {
 773                 sas_notify_lldd_dev_found(dev);
 774                 res = sas_rphy_add(dev->rphy);
 775         }
 776
 777         return res;
 778 }