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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
0004  *
0005  * Copyright (C) 2006 IBM Corporation
0006  *
0007  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
0008  */
0009 
0010 #include <linux/scatterlist.h>
0011 #include <linux/slab.h>
0012 #include <linux/async.h>
0013 #include <linux/export.h>
0014 
0015 #include <scsi/sas_ata.h>
0016 #include "sas_internal.h"
0017 #include <scsi/scsi_host.h>
0018 #include <scsi/scsi_device.h>
0019 #include <scsi/scsi_tcq.h>
0020 #include <scsi/scsi.h>
0021 #include <scsi/scsi_transport.h>
0022 #include <scsi/scsi_transport_sas.h>
0023 #include "scsi_sas_internal.h"
0024 #include "scsi_transport_api.h"
0025 #include <scsi/scsi_eh.h>
0026 
0027 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
0028 {
0029     /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
0030 
0031     /* transport error */
0032     if (ts->resp == SAS_TASK_UNDELIVERED)
0033         return AC_ERR_ATA_BUS;
0034 
0035     /* ts->resp == SAS_TASK_COMPLETE */
0036     /* task delivered, what happened afterwards? */
0037     switch (ts->stat) {
0038     case SAS_DEV_NO_RESPONSE:
0039         return AC_ERR_TIMEOUT;
0040     case SAS_INTERRUPTED:
0041     case SAS_PHY_DOWN:
0042     case SAS_NAK_R_ERR:
0043         return AC_ERR_ATA_BUS;
0044     case SAS_DATA_UNDERRUN:
0045         /*
0046          * Some programs that use the taskfile interface
0047          * (smartctl in particular) can cause underrun
0048          * problems.  Ignore these errors, perhaps at our
0049          * peril.
0050          */
0051         return 0;
0052     case SAS_DATA_OVERRUN:
0053     case SAS_QUEUE_FULL:
0054     case SAS_DEVICE_UNKNOWN:
0055     case SAS_OPEN_TO:
0056     case SAS_OPEN_REJECT:
0057         pr_warn("%s: Saw error %d.  What to do?\n",
0058             __func__, ts->stat);
0059         return AC_ERR_OTHER;
0060     case SAM_STAT_CHECK_CONDITION:
0061     case SAS_ABORTED_TASK:
0062         return AC_ERR_DEV;
0063     case SAS_PROTO_RESPONSE:
0064         /* This means the ending_fis has the error
0065          * value; return 0 here to collect it
0066          */
0067         return 0;
0068     default:
0069         return 0;
0070     }
0071 }
0072 
0073 static void sas_ata_task_done(struct sas_task *task)
0074 {
0075     struct ata_queued_cmd *qc = task->uldd_task;
0076     struct domain_device *dev = task->dev;
0077     struct task_status_struct *stat = &task->task_status;
0078     struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
0079     struct sas_ha_struct *sas_ha = dev->port->ha;
0080     enum ata_completion_errors ac;
0081     unsigned long flags;
0082     struct ata_link *link;
0083     struct ata_port *ap;
0084 
0085     spin_lock_irqsave(&dev->done_lock, flags);
0086     if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
0087         task = NULL;
0088     else if (qc && qc->scsicmd)
0089         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
0090     spin_unlock_irqrestore(&dev->done_lock, flags);
0091 
0092     /* check if libsas-eh got to the task before us */
0093     if (unlikely(!task))
0094         return;
0095 
0096     if (!qc)
0097         goto qc_already_gone;
0098 
0099     ap = qc->ap;
0100     link = &ap->link;
0101 
0102     spin_lock_irqsave(ap->lock, flags);
0103     /* check if we lost the race with libata/sas_ata_post_internal() */
0104     if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
0105         spin_unlock_irqrestore(ap->lock, flags);
0106         if (qc->scsicmd)
0107             goto qc_already_gone;
0108         else {
0109             /* if eh is not involved and the port is frozen then the
0110              * ata internal abort process has taken responsibility
0111              * for this sas_task
0112              */
0113             return;
0114         }
0115     }
0116 
0117     if (stat->stat == SAS_PROTO_RESPONSE ||
0118         stat->stat == SAS_SAM_STAT_GOOD ||
0119         (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
0120           dev->sata_dev.class == ATA_DEV_ATAPI)) {
0121         memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
0122 
0123         if (!link->sactive) {
0124             qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
0125         } else {
0126             link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
0127             if (unlikely(link->eh_info.err_mask))
0128                 qc->flags |= ATA_QCFLAG_FAILED;
0129         }
0130     } else {
0131         ac = sas_to_ata_err(stat);
0132         if (ac) {
0133             pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
0134             /* We saw a SAS error. Send a vague error. */
0135             if (!link->sactive) {
0136                 qc->err_mask = ac;
0137             } else {
0138                 link->eh_info.err_mask |= AC_ERR_DEV;
0139                 qc->flags |= ATA_QCFLAG_FAILED;
0140             }
0141 
0142             dev->sata_dev.fis[3] = 0x04; /* status err */
0143             dev->sata_dev.fis[2] = ATA_ERR;
0144         }
0145     }
0146 
0147     qc->lldd_task = NULL;
0148     ata_qc_complete(qc);
0149     spin_unlock_irqrestore(ap->lock, flags);
0150 
0151 qc_already_gone:
0152     sas_free_task(task);
0153 }
0154 
0155 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
0156     __must_hold(ap->lock)
0157 {
0158     struct sas_task *task;
0159     struct scatterlist *sg;
0160     int ret = AC_ERR_SYSTEM;
0161     unsigned int si, xfer = 0;
0162     struct ata_port *ap = qc->ap;
0163     struct domain_device *dev = ap->private_data;
0164     struct sas_ha_struct *sas_ha = dev->port->ha;
0165     struct Scsi_Host *host = sas_ha->core.shost;
0166     struct sas_internal *i = to_sas_internal(host->transportt);
0167 
0168     /* TODO: we should try to remove that unlock */
0169     spin_unlock(ap->lock);
0170 
0171     /* If the device fell off, no sense in issuing commands */
0172     if (test_bit(SAS_DEV_GONE, &dev->state))
0173         goto out;
0174 
0175     task = sas_alloc_task(GFP_ATOMIC);
0176     if (!task)
0177         goto out;
0178     task->dev = dev;
0179     task->task_proto = SAS_PROTOCOL_STP;
0180     task->task_done = sas_ata_task_done;
0181 
0182     /* For NCQ commands, zero out the tag libata assigned us */
0183     if (ata_is_ncq(qc->tf.protocol))
0184         qc->tf.nsect = 0;
0185 
0186     ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
0187     task->uldd_task = qc;
0188     if (ata_is_atapi(qc->tf.protocol)) {
0189         memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
0190         task->total_xfer_len = qc->nbytes;
0191         task->num_scatter = qc->n_elem;
0192         task->data_dir = qc->dma_dir;
0193     } else if (!ata_is_data(qc->tf.protocol)) {
0194         task->data_dir = DMA_NONE;
0195     } else {
0196         for_each_sg(qc->sg, sg, qc->n_elem, si)
0197             xfer += sg_dma_len(sg);
0198 
0199         task->total_xfer_len = xfer;
0200         task->num_scatter = si;
0201         task->data_dir = qc->dma_dir;
0202     }
0203     task->scatter = qc->sg;
0204     task->ata_task.retry_count = 1;
0205     qc->lldd_task = task;
0206 
0207     task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
0208     task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
0209 
0210     if (qc->scsicmd)
0211         ASSIGN_SAS_TASK(qc->scsicmd, task);
0212 
0213     ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
0214     if (ret) {
0215         pr_debug("lldd_execute_task returned: %d\n", ret);
0216 
0217         if (qc->scsicmd)
0218             ASSIGN_SAS_TASK(qc->scsicmd, NULL);
0219         sas_free_task(task);
0220         qc->lldd_task = NULL;
0221         ret = AC_ERR_SYSTEM;
0222     }
0223 
0224  out:
0225     spin_lock(ap->lock);
0226     return ret;
0227 }
0228 
0229 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
0230 {
0231     struct domain_device *dev = qc->ap->private_data;
0232 
0233     ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
0234     return true;
0235 }
0236 
0237 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
0238 {
0239     return to_sas_internal(dev->port->ha->core.shost->transportt);
0240 }
0241 
0242 static int sas_get_ata_command_set(struct domain_device *dev);
0243 
0244 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
0245 {
0246     if (phy->attached_tproto & SAS_PROTOCOL_STP)
0247         dev->tproto = phy->attached_tproto;
0248     if (phy->attached_sata_dev)
0249         dev->tproto |= SAS_SATA_DEV;
0250 
0251     if (phy->attached_dev_type == SAS_SATA_PENDING)
0252         dev->dev_type = SAS_SATA_PENDING;
0253     else {
0254         int res;
0255 
0256         dev->dev_type = SAS_SATA_DEV;
0257         res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
0258                           &dev->sata_dev.rps_resp);
0259         if (res) {
0260             pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
0261                  SAS_ADDR(dev->parent->sas_addr),
0262                  phy->phy_id, res);
0263             return res;
0264         }
0265         memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
0266                sizeof(struct dev_to_host_fis));
0267         dev->sata_dev.class = sas_get_ata_command_set(dev);
0268     }
0269     return 0;
0270 }
0271 
0272 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
0273 {
0274     int res;
0275 
0276     /* we weren't pending, so successfully end the reset sequence now */
0277     if (dev->dev_type != SAS_SATA_PENDING)
0278         return 1;
0279 
0280     /* hmmm, if this succeeds do we need to repost the domain_device to the
0281      * lldd so it can pick up new parameters?
0282      */
0283     res = sas_get_ata_info(dev, phy);
0284     if (res)
0285         return 0; /* retry */
0286     else
0287         return 1;
0288 }
0289 
0290 static int smp_ata_check_ready(struct ata_link *link)
0291 {
0292     int res;
0293     struct ata_port *ap = link->ap;
0294     struct domain_device *dev = ap->private_data;
0295     struct domain_device *ex_dev = dev->parent;
0296     struct sas_phy *phy = sas_get_local_phy(dev);
0297     struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
0298 
0299     res = sas_ex_phy_discover(ex_dev, phy->number);
0300     sas_put_local_phy(phy);
0301 
0302     /* break the wait early if the expander is unreachable,
0303      * otherwise keep polling
0304      */
0305     if (res == -ECOMM)
0306         return res;
0307     if (res != SMP_RESP_FUNC_ACC)
0308         return 0;
0309 
0310     switch (ex_phy->attached_dev_type) {
0311     case SAS_SATA_PENDING:
0312         return 0;
0313     case SAS_END_DEVICE:
0314         if (ex_phy->attached_sata_dev)
0315             return sas_ata_clear_pending(dev, ex_phy);
0316         fallthrough;
0317     default:
0318         return -ENODEV;
0319     }
0320 }
0321 
0322 static int local_ata_check_ready(struct ata_link *link)
0323 {
0324     struct ata_port *ap = link->ap;
0325     struct domain_device *dev = ap->private_data;
0326     struct sas_internal *i = dev_to_sas_internal(dev);
0327 
0328     if (i->dft->lldd_ata_check_ready)
0329         return i->dft->lldd_ata_check_ready(dev);
0330     else {
0331         /* lldd's that don't implement 'ready' checking get the
0332          * old default behavior of not coordinating reset
0333          * recovery with libata
0334          */
0335         return 1;
0336     }
0337 }
0338 
0339 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
0340               const char *fmt, ...)
0341 {
0342     struct ata_port *ap = ddev->sata_dev.ap;
0343     struct device *dev = &ddev->rphy->dev;
0344     struct va_format vaf;
0345     va_list args;
0346     int r;
0347 
0348     va_start(args, fmt);
0349 
0350     vaf.fmt = fmt;
0351     vaf.va = &args;
0352 
0353     r = printk("%s" SAS_FMT "ata%u: %s: %pV",
0354            level, ap->print_id, dev_name(dev), &vaf);
0355 
0356     va_end(args);
0357 
0358     return r;
0359 }
0360 
0361 int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
0362 {
0363     struct sata_device *sata_dev = &dev->sata_dev;
0364     int (*check_ready)(struct ata_link *link);
0365     struct ata_port *ap = sata_dev->ap;
0366     struct ata_link *link = &ap->link;
0367     struct sas_phy *phy;
0368     int ret;
0369 
0370     phy = sas_get_local_phy(dev);
0371     if (scsi_is_sas_phy_local(phy))
0372         check_ready = local_ata_check_ready;
0373     else
0374         check_ready = smp_ata_check_ready;
0375     sas_put_local_phy(phy);
0376 
0377     ret = ata_wait_after_reset(link, deadline, check_ready);
0378     if (ret && ret != -EAGAIN)
0379         sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
0380 
0381     return ret;
0382 }
0383 EXPORT_SYMBOL_GPL(sas_ata_wait_after_reset);
0384 
0385 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
0386                   unsigned long deadline)
0387 {
0388     struct ata_port *ap = link->ap;
0389     struct domain_device *dev = ap->private_data;
0390     struct sas_internal *i = dev_to_sas_internal(dev);
0391     int ret;
0392 
0393     ret = i->dft->lldd_I_T_nexus_reset(dev);
0394     if (ret == -ENODEV)
0395         return ret;
0396 
0397     if (ret != TMF_RESP_FUNC_COMPLETE)
0398         sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
0399 
0400     ret = sas_ata_wait_after_reset(dev, deadline);
0401 
0402     *class = dev->sata_dev.class;
0403 
0404     ap->cbl = ATA_CBL_SATA;
0405     return ret;
0406 }
0407 
0408 /*
0409  * notify the lldd to forget the sas_task for this internal ata command
0410  * that bypasses scsi-eh
0411  */
0412 static void sas_ata_internal_abort(struct sas_task *task)
0413 {
0414     struct sas_internal *si = dev_to_sas_internal(task->dev);
0415     unsigned long flags;
0416     int res;
0417 
0418     spin_lock_irqsave(&task->task_state_lock, flags);
0419     if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
0420         task->task_state_flags & SAS_TASK_STATE_DONE) {
0421         spin_unlock_irqrestore(&task->task_state_lock, flags);
0422         pr_debug("%s: Task %p already finished.\n", __func__, task);
0423         goto out;
0424     }
0425     task->task_state_flags |= SAS_TASK_STATE_ABORTED;
0426     spin_unlock_irqrestore(&task->task_state_lock, flags);
0427 
0428     res = si->dft->lldd_abort_task(task);
0429 
0430     spin_lock_irqsave(&task->task_state_lock, flags);
0431     if (task->task_state_flags & SAS_TASK_STATE_DONE ||
0432         res == TMF_RESP_FUNC_COMPLETE) {
0433         spin_unlock_irqrestore(&task->task_state_lock, flags);
0434         goto out;
0435     }
0436 
0437     /* XXX we are not prepared to deal with ->lldd_abort_task()
0438      * failures.  TODO: lldds need to unconditionally forget about
0439      * aborted ata tasks, otherwise we (likely) leak the sas task
0440      * here
0441      */
0442     pr_warn("%s: Task %p leaked.\n", __func__, task);
0443 
0444     if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
0445         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
0446     spin_unlock_irqrestore(&task->task_state_lock, flags);
0447 
0448     return;
0449  out:
0450     sas_free_task(task);
0451 }
0452 
0453 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
0454 {
0455     if (qc->flags & ATA_QCFLAG_FAILED)
0456         qc->err_mask |= AC_ERR_OTHER;
0457 
0458     if (qc->err_mask) {
0459         /*
0460          * Find the sas_task and kill it.  By this point, libata
0461          * has decided to kill the qc and has frozen the port.
0462          * In this state sas_ata_task_done() will no longer free
0463          * the sas_task, so we need to notify the lldd (via
0464          * ->lldd_abort_task) that the task is dead and free it
0465          *  ourselves.
0466          */
0467         struct sas_task *task = qc->lldd_task;
0468 
0469         qc->lldd_task = NULL;
0470         if (!task)
0471             return;
0472         task->uldd_task = NULL;
0473         sas_ata_internal_abort(task);
0474     }
0475 }
0476 
0477 
0478 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
0479 {
0480     struct domain_device *dev = ap->private_data;
0481     struct sas_internal *i = dev_to_sas_internal(dev);
0482 
0483     if (i->dft->lldd_ata_set_dmamode)
0484         i->dft->lldd_ata_set_dmamode(dev);
0485 }
0486 
0487 static void sas_ata_sched_eh(struct ata_port *ap)
0488 {
0489     struct domain_device *dev = ap->private_data;
0490     struct sas_ha_struct *ha = dev->port->ha;
0491     unsigned long flags;
0492 
0493     spin_lock_irqsave(&ha->lock, flags);
0494     if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
0495         ha->eh_active++;
0496     ata_std_sched_eh(ap);
0497     spin_unlock_irqrestore(&ha->lock, flags);
0498 }
0499 
0500 void sas_ata_end_eh(struct ata_port *ap)
0501 {
0502     struct domain_device *dev = ap->private_data;
0503     struct sas_ha_struct *ha = dev->port->ha;
0504     unsigned long flags;
0505 
0506     spin_lock_irqsave(&ha->lock, flags);
0507     if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
0508         ha->eh_active--;
0509     spin_unlock_irqrestore(&ha->lock, flags);
0510 }
0511 
0512 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
0513 {
0514     struct ata_port *ap = link->ap;
0515     struct domain_device *dev = ap->private_data;
0516     struct sas_phy *local_phy = sas_get_local_phy(dev);
0517     int res = 0;
0518 
0519     if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
0520         res = -ENOENT;
0521     sas_put_local_phy(local_phy);
0522 
0523     return res;
0524 }
0525 
0526 static struct ata_port_operations sas_sata_ops = {
0527     .prereset       = sas_ata_prereset,
0528     .hardreset      = sas_ata_hard_reset,
0529     .error_handler      = ata_std_error_handler,
0530     .post_internal_cmd  = sas_ata_post_internal,
0531     .qc_defer               = ata_std_qc_defer,
0532     .qc_prep        = ata_noop_qc_prep,
0533     .qc_issue       = sas_ata_qc_issue,
0534     .qc_fill_rtf        = sas_ata_qc_fill_rtf,
0535     .port_start     = ata_sas_port_start,
0536     .port_stop      = ata_sas_port_stop,
0537     .set_dmamode        = sas_ata_set_dmamode,
0538     .sched_eh       = sas_ata_sched_eh,
0539     .end_eh         = sas_ata_end_eh,
0540 };
0541 
0542 static struct ata_port_info sata_port_info = {
0543     .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
0544          ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
0545     .pio_mask = ATA_PIO4,
0546     .mwdma_mask = ATA_MWDMA2,
0547     .udma_mask = ATA_UDMA6,
0548     .port_ops = &sas_sata_ops
0549 };
0550 
0551 int sas_ata_init(struct domain_device *found_dev)
0552 {
0553     struct sas_ha_struct *ha = found_dev->port->ha;
0554     struct Scsi_Host *shost = ha->core.shost;
0555     struct ata_host *ata_host;
0556     struct ata_port *ap;
0557     int rc;
0558 
0559     ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
0560     if (!ata_host)  {
0561         pr_err("ata host alloc failed.\n");
0562         return -ENOMEM;
0563     }
0564 
0565     ata_host_init(ata_host, ha->dev, &sas_sata_ops);
0566 
0567     ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
0568     if (!ap) {
0569         pr_err("ata_sas_port_alloc failed.\n");
0570         rc = -ENODEV;
0571         goto free_host;
0572     }
0573 
0574     ap->private_data = found_dev;
0575     ap->cbl = ATA_CBL_SATA;
0576     ap->scsi_host = shost;
0577     rc = ata_sas_port_init(ap);
0578     if (rc)
0579         goto destroy_port;
0580 
0581     rc = ata_sas_tport_add(ata_host->dev, ap);
0582     if (rc)
0583         goto destroy_port;
0584 
0585     found_dev->sata_dev.ata_host = ata_host;
0586     found_dev->sata_dev.ap = ap;
0587 
0588     return 0;
0589 
0590 destroy_port:
0591     ata_sas_port_destroy(ap);
0592 free_host:
0593     ata_host_put(ata_host);
0594     return rc;
0595 }
0596 
0597 void sas_ata_task_abort(struct sas_task *task)
0598 {
0599     struct ata_queued_cmd *qc = task->uldd_task;
0600     struct completion *waiting;
0601 
0602     /* Bounce SCSI-initiated commands to the SCSI EH */
0603     if (qc->scsicmd) {
0604         blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
0605         return;
0606     }
0607 
0608     /* Internal command, fake a timeout and complete. */
0609     qc->flags &= ~ATA_QCFLAG_ACTIVE;
0610     qc->flags |= ATA_QCFLAG_FAILED;
0611     qc->err_mask |= AC_ERR_TIMEOUT;
0612     waiting = qc->private_data;
0613     complete(waiting);
0614 }
0615 
0616 static int sas_get_ata_command_set(struct domain_device *dev)
0617 {
0618     struct dev_to_host_fis *fis =
0619         (struct dev_to_host_fis *) dev->frame_rcvd;
0620     struct ata_taskfile tf;
0621 
0622     if (dev->dev_type == SAS_SATA_PENDING)
0623         return ATA_DEV_UNKNOWN;
0624 
0625     ata_tf_from_fis((const u8 *)fis, &tf);
0626 
0627     return ata_dev_classify(&tf);
0628 }
0629 
0630 void sas_probe_sata(struct asd_sas_port *port)
0631 {
0632     struct domain_device *dev, *n;
0633 
0634     mutex_lock(&port->ha->disco_mutex);
0635     list_for_each_entry(dev, &port->disco_list, disco_list_node) {
0636         if (!dev_is_sata(dev))
0637             continue;
0638 
0639         ata_sas_async_probe(dev->sata_dev.ap);
0640     }
0641     mutex_unlock(&port->ha->disco_mutex);
0642 
0643     list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
0644         if (!dev_is_sata(dev))
0645             continue;
0646 
0647         sas_ata_wait_eh(dev);
0648 
0649         /* if libata could not bring the link up, don't surface
0650          * the device
0651          */
0652         if (!ata_dev_enabled(sas_to_ata_dev(dev)))
0653             sas_fail_probe(dev, __func__, -ENODEV);
0654     }
0655 
0656 }
0657 
0658 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
0659 {
0660     struct domain_device *dev, *n;
0661 
0662     list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
0663         if (!dev_is_sata(dev))
0664             continue;
0665 
0666         sas_ata_wait_eh(dev);
0667 
0668         /* if libata failed to power manage the device, tear it down */
0669         if (ata_dev_disabled(sas_to_ata_dev(dev)))
0670             sas_fail_probe(dev, func, -ENODEV);
0671     }
0672 }
0673 
0674 void sas_suspend_sata(struct asd_sas_port *port)
0675 {
0676     struct domain_device *dev;
0677 
0678     mutex_lock(&port->ha->disco_mutex);
0679     list_for_each_entry(dev, &port->dev_list, dev_list_node) {
0680         struct sata_device *sata;
0681 
0682         if (!dev_is_sata(dev))
0683             continue;
0684 
0685         sata = &dev->sata_dev;
0686         if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
0687             continue;
0688 
0689         ata_sas_port_suspend(sata->ap);
0690     }
0691     mutex_unlock(&port->ha->disco_mutex);
0692 
0693     sas_ata_flush_pm_eh(port, __func__);
0694 }
0695 
0696 void sas_resume_sata(struct asd_sas_port *port)
0697 {
0698     struct domain_device *dev;
0699 
0700     mutex_lock(&port->ha->disco_mutex);
0701     list_for_each_entry(dev, &port->dev_list, dev_list_node) {
0702         struct sata_device *sata;
0703 
0704         if (!dev_is_sata(dev))
0705             continue;
0706 
0707         sata = &dev->sata_dev;
0708         if (sata->ap->pm_mesg.event == PM_EVENT_ON)
0709             continue;
0710 
0711         ata_sas_port_resume(sata->ap);
0712     }
0713     mutex_unlock(&port->ha->disco_mutex);
0714 
0715     sas_ata_flush_pm_eh(port, __func__);
0716 }
0717 
0718 /**
0719  * sas_discover_sata - discover an STP/SATA domain device
0720  * @dev: pointer to struct domain_device of interest
0721  *
0722  * Devices directly attached to a HA port, have no parents.  All other
0723  * devices do, and should have their "parent" pointer set appropriately
0724  * before calling this function.
0725  */
0726 int sas_discover_sata(struct domain_device *dev)
0727 {
0728     if (dev->dev_type == SAS_SATA_PM)
0729         return -ENODEV;
0730 
0731     dev->sata_dev.class = sas_get_ata_command_set(dev);
0732     sas_fill_in_rphy(dev, dev->rphy);
0733 
0734     return sas_notify_lldd_dev_found(dev);
0735 }
0736 
0737 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
0738 {
0739     struct domain_device *dev = data;
0740     struct ata_port *ap = dev->sata_dev.ap;
0741     struct sas_ha_struct *ha = dev->port->ha;
0742 
0743     sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
0744     ata_scsi_port_error_handler(ha->core.shost, ap);
0745     sas_put_device(dev);
0746 }
0747 
0748 void sas_ata_strategy_handler(struct Scsi_Host *shost)
0749 {
0750     struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
0751     ASYNC_DOMAIN_EXCLUSIVE(async);
0752     int i;
0753 
0754     /* it's ok to defer revalidation events during ata eh, these
0755      * disks are in one of three states:
0756      * 1/ present for initial domain discovery, and these
0757      *    resets will cause bcn flutters
0758      * 2/ hot removed, we'll discover that after eh fails
0759      * 3/ hot added after initial discovery, lost the race, and need
0760      *    to catch the next train.
0761      */
0762     sas_disable_revalidation(sas_ha);
0763 
0764     spin_lock_irq(&sas_ha->phy_port_lock);
0765     for (i = 0; i < sas_ha->num_phys; i++) {
0766         struct asd_sas_port *port = sas_ha->sas_port[i];
0767         struct domain_device *dev;
0768 
0769         spin_lock(&port->dev_list_lock);
0770         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
0771             if (!dev_is_sata(dev))
0772                 continue;
0773 
0774             /* hold a reference over eh since we may be
0775              * racing with final remove once all commands
0776              * are completed
0777              */
0778             kref_get(&dev->kref);
0779 
0780             async_schedule_domain(async_sas_ata_eh, dev, &async);
0781         }
0782         spin_unlock(&port->dev_list_lock);
0783     }
0784     spin_unlock_irq(&sas_ha->phy_port_lock);
0785 
0786     async_synchronize_full_domain(&async);
0787 
0788     sas_enable_revalidation(sas_ha);
0789 }
0790 
0791 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
0792 {
0793     struct scsi_cmnd *cmd, *n;
0794     struct domain_device *eh_dev;
0795 
0796     do {
0797         LIST_HEAD(sata_q);
0798         eh_dev = NULL;
0799 
0800         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
0801             struct domain_device *ddev = cmd_to_domain_dev(cmd);
0802 
0803             if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
0804                 continue;
0805             if (eh_dev && eh_dev != ddev)
0806                 continue;
0807             eh_dev = ddev;
0808             list_move(&cmd->eh_entry, &sata_q);
0809         }
0810 
0811         if (!list_empty(&sata_q)) {
0812             struct ata_port *ap = eh_dev->sata_dev.ap;
0813 
0814             sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
0815             ata_scsi_cmd_error_handler(shost, ap, &sata_q);
0816             /*
0817              * ata's error handler may leave the cmd on the list
0818              * so make sure they don't remain on a stack list
0819              * about to go out of scope.
0820              *
0821              * This looks strange, since the commands are
0822              * now part of no list, but the next error
0823              * action will be ata_port_error_handler()
0824              * which takes no list and sweeps them up
0825              * anyway from the ata tag array.
0826              */
0827             while (!list_empty(&sata_q))
0828                 list_del_init(sata_q.next);
0829         }
0830     } while (eh_dev);
0831 }
0832 
0833 void sas_ata_schedule_reset(struct domain_device *dev)
0834 {
0835     struct ata_eh_info *ehi;
0836     struct ata_port *ap;
0837     unsigned long flags;
0838 
0839     if (!dev_is_sata(dev))
0840         return;
0841 
0842     ap = dev->sata_dev.ap;
0843     ehi = &ap->link.eh_info;
0844 
0845     spin_lock_irqsave(ap->lock, flags);
0846     ehi->err_mask |= AC_ERR_TIMEOUT;
0847     ehi->action |= ATA_EH_RESET;
0848     ata_port_schedule_eh(ap);
0849     spin_unlock_irqrestore(ap->lock, flags);
0850 }
0851 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
0852 
0853 void sas_ata_wait_eh(struct domain_device *dev)
0854 {
0855     struct ata_port *ap;
0856 
0857     if (!dev_is_sata(dev))
0858         return;
0859 
0860     ap = dev->sata_dev.ap;
0861     ata_port_wait_eh(ap);
0862 }
0863 
0864 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
0865 {
0866     struct sas_tmf_task tmf_task = {};
0867     return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
0868                    force_phy_id, &tmf_task);
0869 }
0870 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
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