drivers/scsi/libsas/sas_ata.c

   1 /*
   2  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  *
   6  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26
  27 #include <scsi/sas_ata.h>
  28 #include "sas_internal.h"
  29 #include <scsi/scsi_host.h>
  30 #include <scsi/scsi_device.h>
  31 #include <scsi/scsi_tcq.h>
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35 #include "../scsi_sas_internal.h"
  36 #include "../scsi_transport_api.h"
  37 #include <scsi/scsi_eh.h>
  38
  39 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  40 {
  41         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  42
  43         /* transport error */
  44         if (ts->resp == SAS_TASK_UNDELIVERED)
  45                 return AC_ERR_ATA_BUS;
  46
  47         /* ts->resp == SAS_TASK_COMPLETE */
  48         /* task delivered, what happened afterwards? */
  49         switch (ts->stat) {
  50                 case SAS_DEV_NO_RESPONSE:
  51                         return AC_ERR_TIMEOUT;
  52
  53                 case SAS_INTERRUPTED:
  54                 case SAS_PHY_DOWN:
  55                 case SAS_NAK_R_ERR:
  56                         return AC_ERR_ATA_BUS;
  57
  58
  59                 case SAS_DATA_UNDERRUN:
  60                         /*
  61                          * Some programs that use the taskfile interface
  62                          * (smartctl in particular) can cause underrun
  63                          * problems.  Ignore these errors, perhaps at our
  64                          * peril.
  65                          */
  66                         return 0;
  67
  68                 case SAS_DATA_OVERRUN:
  69                 case SAS_QUEUE_FULL:
  70                 case SAS_DEVICE_UNKNOWN:
  71                 case SAS_SG_ERR:
  72                         return AC_ERR_INVALID;
  73
  74                 case SAS_OPEN_TO:
  75                 case SAS_OPEN_REJECT:
  76                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  77                                     __func__, ts->stat);
  78                         return AC_ERR_OTHER;
  79
  80                 case SAM_STAT_CHECK_CONDITION:
  81                 case SAS_ABORTED_TASK:
  82                         return AC_ERR_DEV;
  83
  84                 case SAS_PROTO_RESPONSE:
  85                         /* This means the ending_fis has the error
  86                          * value; return 0 here to collect it */
  87                         return 0;
  88                 default:
  89                         return 0;
  90         }
  91 }
  92
  93 static void sas_ata_task_done(struct sas_task *task)
  94 {
  95         struct ata_queued_cmd *qc = task->uldd_task;
  96         struct domain_device *dev;
  97         struct task_status_struct *stat = &task->task_status;
  98         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  99         struct sas_ha_struct *sas_ha;
 100         enum ata_completion_errors ac;
 101         unsigned long flags;
 102         struct ata_link *link;
 103
 104         if (!qc)
 105                 goto qc_already_gone;
 106
 107         dev = qc->ap->private_data;
 108         sas_ha = dev->port->ha;
 109         link = &dev->sata_dev.ap->link;
 110
 111         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 112         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 113             ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 114               dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
 115                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 116
 117                 if (!link->sactive) {
 118                         qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 119                 } else {
 120                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 121                         if (unlikely(link->eh_info.err_mask))
 122                                 qc->flags |= ATA_QCFLAG_FAILED;
 123                 }
 124
 125                 dev->sata_dev.sstatus = resp->sstatus;
 126                 dev->sata_dev.serror = resp->serror;
 127                 dev->sata_dev.scontrol = resp->scontrol;
 128         } else {
 129                 ac = sas_to_ata_err(stat);
 130                 if (ac) {
 131                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 132                                     stat->stat);
 133                         /* We saw a SAS error. Send a vague error. */
 134                         if (!link->sactive) {
 135                                 qc->err_mask = ac;
 136                         } else {
 137                                 link->eh_info.err_mask |= AC_ERR_DEV;
 138                                 qc->flags |= ATA_QCFLAG_FAILED;
 139                         }
 140
 141                         dev->sata_dev.tf.feature = 0x04; /* status err */
 142                         dev->sata_dev.tf.command = ATA_ERR;
 143                 }
 144         }
 145
 146         qc->lldd_task = NULL;
 147         if (qc->scsicmd)
 148                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 149         ata_qc_complete(qc);
 150         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 151
 152         /*
 153          * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 154          * flag is set, then we must have come in via the libsas EH
 155          * functions.  When we exit this function, we need to put the
 156          * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 157          * call cleans up the libata side of things but we're protected
 158          * from the scsi_cmnd going away because the scsi_cmnd is owned
 159          * by the EH, making libata's call to scsi_done a NOP.
 160          */
 161         spin_lock_irqsave(&task->task_state_lock, flags);
 162         if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 163                 scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 164         spin_unlock_irqrestore(&task->task_state_lock, flags);
 165
 166 qc_already_gone:
 167         list_del_init(&task->list);
 168         sas_free_task(task);
 169 }
 170
 171 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 172 {
 173         int res;
 174         struct sas_task *task;
 175         struct domain_device *dev = qc->ap->private_data;
 176         struct sas_ha_struct *sas_ha = dev->port->ha;
 177         struct Scsi_Host *host = sas_ha->core.shost;
 178         struct sas_internal *i = to_sas_internal(host->transportt);
 179         struct scatterlist *sg;
 180         unsigned int xfer = 0;
 181         unsigned int si;
 182
 183         /* If the device fell off, no sense in issuing commands */
 184         if (dev->gone)
 185                 return AC_ERR_SYSTEM;
 186
 187         task = sas_alloc_task(GFP_ATOMIC);
 188         if (!task)
 189                 return AC_ERR_SYSTEM;
 190         task->dev = dev;
 191         task->task_proto = SAS_PROTOCOL_STP;
 192         task->task_done = sas_ata_task_done;
 193
 194         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 195             qc->tf.command == ATA_CMD_FPDMA_READ) {
 196                 /* Need to zero out the tag libata assigned us */
 197                 qc->tf.nsect = 0;
 198         }
 199
 200         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 201         task->uldd_task = qc;
 202         if (ata_is_atapi(qc->tf.protocol)) {
 203                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 204                 task->total_xfer_len = qc->nbytes;
 205                 task->num_scatter = qc->n_elem;
 206         } else {
 207                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 208                         xfer += sg->length;
 209
 210                 task->total_xfer_len = xfer;
 211                 task->num_scatter = si;
 212         }
 213
 214         task->data_dir = qc->dma_dir;
 215         task->scatter = qc->sg;
 216         task->ata_task.retry_count = 1;
 217         task->task_state_flags = SAS_TASK_STATE_PENDING;
 218         qc->lldd_task = task;
 219
 220         switch (qc->tf.protocol) {
 221         case ATA_PROT_NCQ:
 222                 task->ata_task.use_ncq = 1;
 223                 /* fall through */
 224         case ATAPI_PROT_DMA:
 225         case ATA_PROT_DMA:
 226                 task->ata_task.dma_xfer = 1;
 227                 break;
 228         }
 229
 230         if (qc->scsicmd)
 231                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 232
 233         if (sas_ha->lldd_max_execute_num < 2)
 234                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 235         else
 236                 res = sas_queue_up(task);
 237
 238         /* Examine */
 239         if (res) {
 240                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 241
 242                 if (qc->scsicmd)
 243                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 244                 sas_free_task(task);
 245                 return AC_ERR_SYSTEM;
 246         }
 247
 248         return 0;
 249 }
 250
 251 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 252 {
 253         struct domain_device *dev = qc->ap->private_data;
 254
 255         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 256         return true;
 257 }
 258
 259 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 260                                unsigned long deadline)
 261 {
 262         struct ata_port *ap = link->ap;
 263         struct domain_device *dev = ap->private_data;
 264         struct sas_internal *i =
 265                 to_sas_internal(dev->port->ha->core.shost->transportt);
 266         int res = TMF_RESP_FUNC_FAILED;
 267         int ret = 0;
 268
 269         if (i->dft->lldd_I_T_nexus_reset)
 270                 res = i->dft->lldd_I_T_nexus_reset(dev);
 271
 272         if (res != TMF_RESP_FUNC_COMPLETE) {
 273                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __func__);
 274                 ret = -EAGAIN;
 275         }
 276
 277         switch (dev->sata_dev.command_set) {
 278                 case ATA_COMMAND_SET:
 279                         SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 280                         *class = ATA_DEV_ATA;
 281                         break;
 282                 case ATAPI_COMMAND_SET:
 283                         SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 284                         *class = ATA_DEV_ATAPI;
 285                         break;
 286                 default:
 287                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 288                                     __func__,
 289                                     dev->sata_dev.command_set);
 290                         *class = ATA_DEV_UNKNOWN;
 291                         break;
 292         }
 293
 294         ap->cbl = ATA_CBL_SATA;
 295         return ret;
 296 }
 297
 298 static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
 299                                unsigned long deadline)
 300 {
 301         struct ata_port *ap = link->ap;
 302         struct domain_device *dev = ap->private_data;
 303         struct sas_internal *i =
 304                 to_sas_internal(dev->port->ha->core.shost->transportt);
 305         int res = TMF_RESP_FUNC_FAILED;
 306         int ret = 0;
 307
 308         if (i->dft->lldd_ata_soft_reset)
 309                 res = i->dft->lldd_ata_soft_reset(dev);
 310
 311         if (res != TMF_RESP_FUNC_COMPLETE) {
 312                 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
 313                 ret = -EAGAIN;
 314         }
 315
 316         switch (dev->sata_dev.command_set) {
 317         case ATA_COMMAND_SET:
 318                 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 319                 *class = ATA_DEV_ATA;
 320                 break;
 321         case ATAPI_COMMAND_SET:
 322                 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 323                 *class = ATA_DEV_ATAPI;
 324                 break;
 325         default:
 326                 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 327                             __func__, dev->sata_dev.command_set);
 328                 *class = ATA_DEV_UNKNOWN;
 329                 break;
 330         }
 331
 332         ap->cbl = ATA_CBL_SATA;
 333         return ret;
 334 }
 335
 336 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 337 {
 338         if (qc->flags & ATA_QCFLAG_FAILED)
 339                 qc->err_mask |= AC_ERR_OTHER;
 340
 341         if (qc->err_mask) {
 342                 /*
 343                  * Find the sas_task and kill it.  By this point,
 344                  * libata has decided to kill the qc, so we needn't
 345                  * bother with sas_ata_task_done.  But we still
 346                  * ought to abort the task.
 347                  */
 348                 struct sas_task *task = qc->lldd_task;
 349                 unsigned long flags;
 350
 351                 qc->lldd_task = NULL;
 352                 if (task) {
 353                         /* Should this be a AT(API) device reset? */
 354                         spin_lock_irqsave(&task->task_state_lock, flags);
 355                         task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 356                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 357
 358                         task->uldd_task = NULL;
 359                         __sas_task_abort(task);
 360                 }
 361         }
 362 }
 363
 364 static struct ata_port_operations sas_sata_ops = {
 365         .prereset               = ata_std_prereset,
 366         .softreset              = sas_ata_soft_reset,
 367         .hardreset              = sas_ata_hard_reset,
 368         .postreset              = ata_std_postreset,
 369         .error_handler          = ata_std_error_handler,
 370         .post_internal_cmd      = sas_ata_post_internal,
 371         .qc_defer               = ata_std_qc_defer,
 372         .qc_prep                = ata_noop_qc_prep,
 373         .qc_issue               = sas_ata_qc_issue,
 374         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 375         .port_start             = ata_sas_port_start,
 376         .port_stop              = ata_sas_port_stop,
 377 };
 378
 379 static struct ata_port_info sata_port_info = {
 380         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 381         .pio_mask = ATA_PIO4,
 382         .mwdma_mask = ATA_MWDMA2,
 383         .udma_mask = ATA_UDMA6,
 384         .port_ops = &sas_sata_ops
 385 };
 386
 387 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 388                                struct scsi_target *starget)
 389 {
 390         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 391         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 392         struct ata_port *ap;
 393
 394         ata_host_init(&found_dev->sata_dev.ata_host,
 395                       ha->dev,
 396                       sata_port_info.flags,
 397                       &sas_sata_ops);
 398         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 399                                 &sata_port_info,
 400                                 shost);
 401         if (!ap) {
 402                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 403                 return -ENODEV;
 404         }
 405
 406         ap->private_data = found_dev;
 407         ap->cbl = ATA_CBL_SATA;
 408         ap->scsi_host = shost;
 409         found_dev->sata_dev.ap = ap;
 410
 411         return 0;
 412 }
 413
 414 void sas_ata_task_abort(struct sas_task *task)
 415 {
 416         struct ata_queued_cmd *qc = task->uldd_task;
 417         struct completion *waiting;
 418
 419         /* Bounce SCSI-initiated commands to the SCSI EH */
 420         if (qc->scsicmd) {
 421                 struct request_queue *q = qc->scsicmd->device->request_queue;
 422                 unsigned long flags;
 423
 424                 spin_lock_irqsave(q->queue_lock, flags);
 425                 blk_abort_request(qc->scsicmd->request);
 426                 spin_unlock_irqrestore(q->queue_lock, flags);
 427                 scsi_schedule_eh(qc->scsicmd->device->host);
 428                 return;
 429         }
 430
 431         /* Internal command, fake a timeout and complete. */
 432         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 433         qc->flags |= ATA_QCFLAG_FAILED;
 434         qc->err_mask |= AC_ERR_TIMEOUT;
 435         waiting = qc->private_data;
 436         complete(waiting);
 437 }
 438
 439 static void sas_task_timedout(unsigned long _task)
 440 {
 441         struct sas_task *task = (void *) _task;
 442         unsigned long flags;
 443
 444         spin_lock_irqsave(&task->task_state_lock, flags);
 445         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 446                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 447         spin_unlock_irqrestore(&task->task_state_lock, flags);
 448
 449         complete(&task->completion);
 450 }
 451
 452 static void sas_disc_task_done(struct sas_task *task)
 453 {
 454         if (!del_timer(&task->timer))
 455                 return;
 456         complete(&task->completion);
 457 }
 458
 459 #define SAS_DEV_TIMEOUT 10
 460
 461 /**
 462  * sas_execute_task -- Basic task processing for discovery
 463  * @task: the task to be executed
 464  * @buffer: pointer to buffer to do I/O
 465  * @size: size of @buffer
 466  * @dma_dir: DMA direction.  DMA_xxx
 467  */
 468 static int sas_execute_task(struct sas_task *task, void *buffer, int size,
 469                             enum dma_data_direction dma_dir)
 470 {
 471         int res = 0;
 472         struct scatterlist *scatter = NULL;
 473         struct task_status_struct *ts = &task->task_status;
 474         int num_scatter = 0;
 475         int retries = 0;
 476         struct sas_internal *i =
 477                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 478
 479         if (dma_dir != DMA_NONE) {
 480                 scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
 481                 if (!scatter)
 482                         goto out;
 483
 484                 sg_init_one(scatter, buffer, size);
 485                 num_scatter = 1;
 486         }
 487
 488         task->task_proto = task->dev->tproto;
 489         task->scatter = scatter;
 490         task->num_scatter = num_scatter;
 491         task->total_xfer_len = size;
 492         task->data_dir = dma_dir;
 493         task->task_done = sas_disc_task_done;
 494         if (dma_dir != DMA_NONE &&
 495             sas_protocol_ata(task->task_proto)) {
 496                 task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
 497                                                task->scatter,
 498                                                task->num_scatter,
 499                                                task->data_dir);
 500         }
 501
 502         for (retries = 0; retries < 5; retries++) {
 503                 task->task_state_flags = SAS_TASK_STATE_PENDING;
 504                 init_completion(&task->completion);
 505
 506                 task->timer.data = (unsigned long) task;
 507                 task->timer.function = sas_task_timedout;
 508                 task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
 509                 add_timer(&task->timer);
 510
 511                 res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
 512                 if (res) {
 513                         del_timer(&task->timer);
 514                         SAS_DPRINTK("executing SAS discovery task failed:%d\n",
 515                                     res);
 516                         goto ex_err;
 517                 }
 518                 wait_for_completion(&task->completion);
 519                 res = -ECOMM;
 520                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 521                         int res2;
 522                         SAS_DPRINTK("task aborted, flags:0x%x\n",
 523                                     task->task_state_flags);
 524                         res2 = i->dft->lldd_abort_task(task);
 525                         SAS_DPRINTK("came back from abort task\n");
 526                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 527                                 if (res2 == TMF_RESP_FUNC_COMPLETE)
 528                                         continue; /* Retry the task */
 529                                 else
 530                                         goto ex_err;
 531                         }
 532                 }
 533                 if (task->task_status.stat == SAM_STAT_BUSY ||
 534                            task->task_status.stat == SAM_STAT_TASK_SET_FULL ||
 535                            task->task_status.stat == SAS_QUEUE_FULL) {
 536                         SAS_DPRINTK("task: q busy, sleeping...\n");
 537                         schedule_timeout_interruptible(HZ);
 538                 } else if (task->task_status.stat == SAM_STAT_CHECK_CONDITION) {
 539                         struct scsi_sense_hdr shdr;
 540
 541                         if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
 542                                                   &shdr)) {
 543                                 SAS_DPRINTK("couldn't normalize sense\n");
 544                                 continue;
 545                         }
 546                         if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
 547                             (shdr.sense_key == 2 && shdr.asc == 4 &&
 548                              shdr.ascq == 1)) {
 549                                 SAS_DPRINTK("device %016llx LUN: %016llx "
 550                                             "powering up or not ready yet, "
 551                                             "sleeping...\n",
 552                                             SAS_ADDR(task->dev->sas_addr),
 553                                             SAS_ADDR(task->ssp_task.LUN));
 554
 555                                 schedule_timeout_interruptible(5*HZ);
 556                         } else if (shdr.sense_key == 1) {
 557                                 res = 0;
 558                                 break;
 559                         } else if (shdr.sense_key == 5) {
 560                                 break;
 561                         } else {
 562                                 SAS_DPRINTK("dev %016llx LUN: %016llx "
 563                                             "sense key:0x%x ASC:0x%x ASCQ:0x%x"
 564                                             "\n",
 565                                             SAS_ADDR(task->dev->sas_addr),
 566                                             SAS_ADDR(task->ssp_task.LUN),
 567                                             shdr.sense_key,
 568                                             shdr.asc, shdr.ascq);
 569                         }
 570                 } else if (task->task_status.resp != SAS_TASK_COMPLETE ||
 571                            task->task_status.stat != SAM_STAT_GOOD) {
 572                         SAS_DPRINTK("task finished with resp:0x%x, "
 573                                     "stat:0x%x\n",
 574                                     task->task_status.resp,
 575                                     task->task_status.stat);
 576                         goto ex_err;
 577                 } else {
 578                         res = 0;
 579                         break;
 580                 }
 581         }
 582 ex_err:
 583         if (dma_dir != DMA_NONE) {
 584                 if (sas_protocol_ata(task->task_proto))
 585                         dma_unmap_sg(task->dev->port->ha->dev,
 586                                      task->scatter, task->num_scatter,
 587                                      task->data_dir);
 588                 kfree(scatter);
 589         }
 590 out:
 591         return res;
 592 }
 593
 594 /* ---------- SATA ---------- */
 595
 596 static void sas_get_ata_command_set(struct domain_device *dev)
 597 {
 598         struct dev_to_host_fis *fis =
 599                 (struct dev_to_host_fis *) dev->frame_rcvd;
 600
 601         if ((fis->sector_count == 1 && /* ATA */
 602              fis->lbal         == 1 &&
 603              fis->lbam         == 0 &&
 604              fis->lbah         == 0 &&
 605              fis->device       == 0)
 606             ||
 607             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 608              fis->lbal         == 0 &&
 609              fis->lbam         == 0xCE &&
 610              fis->lbah         == 0xAA &&
 611              (fis->device & ~0x10) == 0))
 612
 613                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 614
 615         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 616                   fis->lbal             == 1 &&
 617                   fis->byte_count_low   == 0x14 &&
 618                   fis->byte_count_high  == 0xEB &&
 619                   (fis->device & ~0x10) == 0))
 620
 621                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 622
 623         else if ((fis->sector_count == 1 && /* SEMB */
 624                   fis->lbal         == 1 &&
 625                   fis->lbam         == 0x3C &&
 626                   fis->lbah         == 0xC3 &&
 627                   fis->device       == 0)
 628                 ||
 629                  (fis->interrupt_reason == 1 && /* SATA PM */
 630                   fis->lbal             == 1 &&
 631                   fis->byte_count_low   == 0x69 &&
 632                   fis->byte_count_high  == 0x96 &&
 633                   (fis->device & ~0x10) == 0))
 634
 635                 /* Treat it as a superset? */
 636                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 637 }
 638
 639 /**
 640  * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 641  * @dev: the device to send the command to
 642  * @command: the command register
 643  * @features: the features register
 644  * @buffer: pointer to buffer to do I/O
 645  * @size: size of @buffer
 646  * @dma_dir: DMA direction.  DMA_xxx
 647  */
 648 static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
 649                              u8 features, void *buffer, int size,
 650                              enum dma_data_direction dma_dir)
 651 {
 652         int res = 0;
 653         struct sas_task *task;
 654         struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
 655                 &dev->frame_rcvd[0];
 656
 657         res = -ENOMEM;
 658         task = sas_alloc_task(GFP_KERNEL);
 659         if (!task)
 660                 goto out;
 661
 662         task->dev = dev;
 663
 664         task->ata_task.fis.fis_type = 0x27;
 665         task->ata_task.fis.command = command;
 666         task->ata_task.fis.features = features;
 667         task->ata_task.fis.device = d2h_fis->device;
 668         task->ata_task.retry_count = 1;
 669
 670         res = sas_execute_task(task, buffer, size, dma_dir);
 671
 672         sas_free_task(task);
 673 out:
 674         return res;
 675 }
 676
 677 #define ATA_IDENTIFY_DEV         0xEC
 678 #define ATA_IDENTIFY_PACKET_DEV  0xA1
 679 #define ATA_SET_FEATURES         0xEF
 680 #define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07
 681
 682 /**
 683  * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 684  * @dev: STP/SATA device of interest (ATA/ATAPI)
 685  *
 686  * The LLDD has already been notified of this device, so that we can
 687  * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 688  * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 689  * performance for this device.
 690  */
 691 static int sas_discover_sata_dev(struct domain_device *dev)
 692 {
 693         int     res;
 694         __le16  *identify_x;
 695         u8      command;
 696
 697         identify_x = kzalloc(512, GFP_KERNEL);
 698         if (!identify_x)
 699                 return -ENOMEM;
 700
 701         if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
 702                 dev->sata_dev.identify_device = identify_x;
 703                 command = ATA_IDENTIFY_DEV;
 704         } else {
 705                 dev->sata_dev.identify_packet_device = identify_x;
 706                 command = ATA_IDENTIFY_PACKET_DEV;
 707         }
 708
 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         /* lives on the media? */
 715         if (le16_to_cpu(identify_x[0]) & 4) {
 716                 /* incomplete response */
 717                 SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
 718                             "dev %llx\n", SAS_ADDR(dev->sas_addr));
 719                 if (!(identify_x[83] & cpu_to_le16(1<<6)))
 720                         goto cont1;
 721                 res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
 722                                         ATA_FEATURE_PUP_STBY_SPIN_UP,
 723                                         NULL, 0, DMA_NONE);
 724                 if (res)
 725                         goto cont1;
 726
 727                 schedule_timeout_interruptible(5*HZ); /* More time? */
 728                 res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
 729                                         DMA_FROM_DEVICE);
 730                 if (res)
 731                         goto out_err;
 732         }
 733 cont1:
 734         /* XXX Hint: register this SATA device with SATL.
 735            When this returns, dev->sata_dev->lu is alive and
 736            present.
 737         sas_satl_register_dev(dev);
 738         */
 739
 740         sas_fill_in_rphy(dev, dev->rphy);
 741
 742         return 0;
 743 out_err:
 744         dev->sata_dev.identify_packet_device = NULL;
 745         dev->sata_dev.identify_device = NULL;
 746         kfree(identify_x);
 747         return res;
 748 }
 749
 750 static int sas_discover_sata_pm(struct domain_device *dev)
 751 {
 752         return -ENODEV;
 753 }
 754
 755 /**
 756  * sas_discover_sata -- discover an STP/SATA domain device
 757  * @dev: pointer to struct domain_device of interest
 758  *
 759  * First we notify the LLDD of this device, so we can send frames to
 760  * it.  Then depending on the type of device we call the appropriate
 761  * discover functions.  Once device discover is done, we notify the
 762  * LLDD so that it can fine-tune its parameters for the device, by
 763  * removing it and then adding it.  That is, the second time around,
 764  * the driver would have certain fields, that it is looking at, set.
 765  * Finally we initialize the kobj so that the device can be added to
 766  * the system at registration time.  Devices directly attached to a HA
 767  * port, have no parents.  All other devices do, and should have their
 768  * "parent" pointer set appropriately before calling this function.
 769  */
 770 int sas_discover_sata(struct domain_device *dev)
 771 {
 772         int res;
 773
 774         sas_get_ata_command_set(dev);
 775
 776         res = sas_notify_lldd_dev_found(dev);
 777         if (res)
 778                 return res;
 779
 780         switch (dev->dev_type) {
 781         case SATA_DEV:
 782                 res = sas_discover_sata_dev(dev);
 783                 break;
 784         case SATA_PM:
 785                 res = sas_discover_sata_pm(dev);
 786                 break;
 787         default:
 788                 break;
 789         }
 790         sas_notify_lldd_dev_gone(dev);
 791         if (!res) {
 792                 sas_notify_lldd_dev_found(dev);
 793                 res = sas_rphy_add(dev->rphy);
 794         }
 795
 796         return res;
 797 }
 798
 799 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 800 {
 801         struct scsi_device *sdev;
 802
 803         shost_for_each_device(sdev, shost) {
 804                 struct domain_device *ddev = sdev_to_domain_dev(sdev);
 805                 struct ata_port *ap = ddev->sata_dev.ap;
 806
 807                 if (!dev_is_sata(ddev))
 808                         continue;
 809
 810                 ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
 811                 ata_scsi_port_error_handler(shost, ap);
 812         }
 813 }
 814
 815 int sas_ata_timed_out(struct scsi_cmnd *cmd, struct sas_task *task,
 816                       enum blk_eh_timer_return *rtn)
 817 {
 818         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 819
 820         if (!dev_is_sata(ddev) || task)
 821                 return 0;
 822
 823         /* we're a sata device with no task, so this must be a libata
 824          * eh timeout.  Ideally should hook into libata timeout
 825          * handling, but there's no point, it just wants to activate
 826          * the eh thread */
 827         *rtn = BLK_EH_NOT_HANDLED;
 828         return 1;
 829 }
 830
 831 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 832                struct list_head *done_q)
 833 {
 834         int rtn = 0;
 835         struct scsi_cmnd *cmd, *n;
 836         struct ata_port *ap;
 837
 838         do {
 839                 LIST_HEAD(sata_q);
 840
 841                 ap = NULL;
 842
 843                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 844                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 845
 846                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 847                                 continue;
 848                         if (ap && ap != ddev->sata_dev.ap)
 849                                 continue;
 850                         ap = ddev->sata_dev.ap;
 851                         rtn = 1;
 852                         list_move(&cmd->eh_entry, &sata_q);
 853                 }
 854
 855                 if (!list_empty(&sata_q)) {
 856                         ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
 857                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 858                         /*
 859                          * ata's error handler may leave the cmd on the list
 860                          * so make sure they don't remain on a stack list
 861                          * about to go out of scope.
 862                          *
 863                          * This looks strange, since the commands are
 864                          * now part of no list, but the next error
 865                          * action will be ata_port_error_handler()
 866                          * which takes no list and sweeps them up
 867                          * anyway from the ata tag array.
 868                          */
 869                         while (!list_empty(&sata_q))
 870                                 list_del_init(sata_q.next);
 871                 }
 872         } while (ap);
 873
 874         return rtn;
 875 }