drivers/scsi/libsas/sas_ata.c - kernel/msm-4.19 - Gitiles

 /*
  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
  *
  * Copyright (C) 2006 IBM Corporation
  *
  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation; either version 2 of the
  * License, or (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  * USA
  */

 #include <scsi/sas_ata.h>
 #include "sas_internal.h"
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_tcq.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_sas.h>
 #include "../scsi_sas_internal.h"
 #include "../scsi_transport_api.h"
 #include <scsi/scsi_eh.h>

 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
 {
 	/* Cheesy attempt to translate SAS errors into ATA.  Hah! */

 	/* transport error */
 	if (ts->resp == SAS_TASK_UNDELIVERED)
 		return AC_ERR_ATA_BUS;

 	/* ts->resp == SAS_TASK_COMPLETE */
 	/* task delivered, what happened afterwards? */
 	switch (ts->stat) {
 		case SAS_DEV_NO_RESPONSE:
 			return AC_ERR_TIMEOUT;

 		case SAS_INTERRUPTED:
 		case SAS_PHY_DOWN:
 		case SAS_NAK_R_ERR:
 			return AC_ERR_ATA_BUS;


 		case SAS_DATA_UNDERRUN:
 			/*
 			 * Some programs that use the taskfile interface
 			 * (smartctl in particular) can cause underrun
 			 * problems.  Ignore these errors, perhaps at our
 			 * peril.
 			 */
 			return 0;

 		case SAS_DATA_OVERRUN:
 		case SAS_QUEUE_FULL:
 		case SAS_DEVICE_UNKNOWN:
 		case SAS_SG_ERR:
 			return AC_ERR_INVALID;

 		case SAM_CHECK_COND:
 		case SAS_OPEN_TO:
 		case SAS_OPEN_REJECT:
 			SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
 				    __FUNCTION__, ts->stat);
 			return AC_ERR_OTHER;

 		case SAS_ABORTED_TASK:
 			return AC_ERR_DEV;

 		case SAS_PROTO_RESPONSE:
 			/* This means the ending_fis has the error
 			 * value; return 0 here to collect it */
 			return 0;
 		default:
 			return 0;
 	}
 }

 static void sas_ata_task_done(struct sas_task *task)
 {
 	struct ata_queued_cmd *qc = task->uldd_task;
 	struct domain_device *dev;
 	struct task_status_struct *stat = &task->task_status;
 	struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
 	struct sas_ha_struct *sas_ha;
 	enum ata_completion_errors ac;
 	unsigned long flags;

 	if (!qc)
 		goto qc_already_gone;

 	dev = qc->ap->private_data;
 	sas_ha = dev->port->ha;

 	spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 	if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_GOOD) {
 		ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 		qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 		dev->sata_dev.sstatus = resp->sstatus;
 		dev->sata_dev.serror = resp->serror;
 		dev->sata_dev.scontrol = resp->scontrol;
 	} else if (stat->stat != SAM_STAT_GOOD) {
 		ac = sas_to_ata_err(stat);
 		if (ac) {
 			SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__,
 				    stat->stat);
 			/* We saw a SAS error. Send a vague error. */
 			qc->err_mask = ac;
 			dev->sata_dev.tf.feature = 0x04; /* status err */
 			dev->sata_dev.tf.command = ATA_ERR;
 		}
 	}

 	qc->lldd_task = NULL;
 	if (qc->scsicmd)
 		ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 	ata_qc_complete(qc);
 	spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);

 	/*
 	 * If the sas_task has an ata qc, a scsi_cmnd and the aborted
 	 * flag is set, then we must have come in via the libsas EH
 	 * functions.  When we exit this function, we need to put the
 	 * scsi_cmnd on the list of finished errors.  The ata_qc_complete
 	 * call cleans up the libata side of things but we're protected
 	 * from the scsi_cmnd going away because the scsi_cmnd is owned
 	 * by the EH, making libata's call to scsi_done a NOP.
 	 */
 	spin_lock_irqsave(&task->task_state_lock, flags);
 	if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
 		scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
 	spin_unlock_irqrestore(&task->task_state_lock, flags);

 qc_already_gone:
 	list_del_init(&task->list);
 	sas_free_task(task);
 }

 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 {
 	int res;
 	struct sas_task *task;
 	struct domain_device *dev = qc->ap->private_data;
 	struct sas_ha_struct *sas_ha = dev->port->ha;
 	struct Scsi_Host *host = sas_ha->core.shost;
 	struct sas_internal *i = to_sas_internal(host->transportt);
 	struct scatterlist *sg;
 	unsigned int num = 0;
 	unsigned int xfer = 0;

 	task = sas_alloc_task(GFP_ATOMIC);
 	if (!task)
 		return AC_ERR_SYSTEM;
 	task->dev = dev;
 	task->task_proto = SAS_PROTOCOL_STP;
 	task->task_done = sas_ata_task_done;

 	if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 	    qc->tf.command == ATA_CMD_FPDMA_READ) {
 		/* Need to zero out the tag libata assigned us */
 		qc->tf.nsect = 0;
 	}

 	ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
 	task->uldd_task = qc;
 	if (is_atapi_taskfile(&qc->tf)) {
 		memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 		task->total_xfer_len = qc->nbytes + qc->pad_len;
 		task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
 	} else {
 		ata_for_each_sg(sg, qc) {
 			num++;
 			xfer += sg->length;
 		}

 		task->total_xfer_len = xfer;
 		task->num_scatter = num;
 	}

 	task->data_dir = qc->dma_dir;
 	task->scatter = qc->__sg;
 	task->ata_task.retry_count = 1;
 	task->task_state_flags = SAS_TASK_STATE_PENDING;
 	qc->lldd_task = task;

 	switch (qc->tf.protocol) {
 	case ATA_PROT_NCQ:
 		task->ata_task.use_ncq = 1;
 		/* fall through */
 	case ATA_PROT_ATAPI_DMA:
 	case ATA_PROT_DMA:
 		task->ata_task.dma_xfer = 1;
 		break;
 	}

 	if (qc->scsicmd)
 		ASSIGN_SAS_TASK(qc->scsicmd, task);

 	if (sas_ha->lldd_max_execute_num < 2)
 		res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 	else
 		res = sas_queue_up(task);

 	/* Examine */
 	if (res) {
 		SAS_DPRINTK("lldd_execute_task returned: %d\n", res);

 		if (qc->scsicmd)
 			ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 		sas_free_task(task);
 		return AC_ERR_SYSTEM;
 	}

 	return 0;
 }

 static u8 sas_ata_check_status(struct ata_port *ap)
 {
 	struct domain_device *dev = ap->private_data;
 	return dev->sata_dev.tf.command;
 }

 static void sas_ata_phy_reset(struct ata_port *ap)
 {
 	struct domain_device *dev = ap->private_data;
 	struct sas_internal *i =
 		to_sas_internal(dev->port->ha->core.shost->transportt);
 	int res = 0;

 	if (i->dft->lldd_I_T_nexus_reset)
 		res = i->dft->lldd_I_T_nexus_reset(dev);

 	if (res)
 		SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);

 	switch (dev->sata_dev.command_set) {
 		case ATA_COMMAND_SET:
 			SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
 			ap->device[0].class = ATA_DEV_ATA;
 			break;
 		case ATAPI_COMMAND_SET:
 			SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
 			ap->device[0].class = ATA_DEV_ATAPI;
 			break;
 		default:
 			SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 				    __FUNCTION__,
 				    dev->sata_dev.command_set);
 			ap->device[0].class = ATA_DEV_UNKNOWN;
 			break;
 	}

 	ap->cbl = ATA_CBL_SATA;
 }

 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 {
 	if (qc->flags & ATA_QCFLAG_FAILED)
 		qc->err_mask |= AC_ERR_OTHER;

 	if (qc->err_mask) {
 		/*
 		 * Find the sas_task and kill it.  By this point,
 		 * libata has decided to kill the qc, so we needn't
 		 * bother with sas_ata_task_done.  But we still
 		 * ought to abort the task.
 		 */
 		struct sas_task *task = qc->lldd_task;
 		unsigned long flags;

 		qc->lldd_task = NULL;
 		if (task) {
 			/* Should this be a AT(API) device reset? */
 			spin_lock_irqsave(&task->task_state_lock, flags);
 			task->task_state_flags |= SAS_TASK_NEED_DEV_RESET;
 			spin_unlock_irqrestore(&task->task_state_lock, flags);

 			task->uldd_task = NULL;
 			__sas_task_abort(task);
 		}
 	}
 }

 static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 {
 	struct domain_device *dev = ap->private_data;
 	memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
 }

 static void sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 			      u32 val)
 {
 	struct domain_device *dev = ap->private_data;

 	SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 	switch (sc_reg_in) {
 		case SCR_STATUS:
 			dev->sata_dev.sstatus = val;
 			break;
 		case SCR_CONTROL:
 			dev->sata_dev.scontrol = val;
 			break;
 		case SCR_ERROR:
 			dev->sata_dev.serror = val;
 			break;
 		case SCR_ACTIVE:
 			dev->sata_dev.ap->sactive = val;
 			break;
 	}
 }

 static u32 sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
 {
 	struct domain_device *dev = ap->private_data;

 	SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 	switch (sc_reg_in) {
 		case SCR_STATUS:
 			return dev->sata_dev.sstatus;
 		case SCR_CONTROL:
 			return dev->sata_dev.scontrol;
 		case SCR_ERROR:
 			return dev->sata_dev.serror;
 		case SCR_ACTIVE:
 			return dev->sata_dev.ap->sactive;
 		default:
 			return 0xffffffffU;
 	}
 }

 static struct ata_port_operations sas_sata_ops = {
 	.port_disable		= ata_port_disable,
 	.check_status		= sas_ata_check_status,
 	.check_altstatus	= sas_ata_check_status,
 	.dev_select		= ata_noop_dev_select,
 	.phy_reset		= sas_ata_phy_reset,
 	.post_internal_cmd	= sas_ata_post_internal,
 	.tf_read		= sas_ata_tf_read,
 	.qc_prep		= ata_noop_qc_prep,
 	.qc_issue		= sas_ata_qc_issue,
 	.port_start		= ata_sas_port_start,
 	.port_stop		= ata_sas_port_stop,
 	.scr_read		= sas_ata_scr_read,
 	.scr_write		= sas_ata_scr_write
 };

 static struct ata_port_info sata_port_info = {
 	.flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 		ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 	.pio_mask = 0x1f, /* PIO0-4 */
 	.mwdma_mask = 0x07, /* MWDMA0-2 */
 	.udma_mask = ATA_UDMA6,
 	.port_ops = &sas_sata_ops
 };

 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 			       struct scsi_target *starget)
 {
 	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 	struct ata_port *ap;

 	ata_host_init(&found_dev->sata_dev.ata_host,
 		      &ha->pcidev->dev,
 		      sata_port_info.flags,
 		      &sas_sata_ops);
 	ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 				&sata_port_info,
 				shost);
 	if (!ap) {
 		SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 		return -ENODEV;
 	}

 	ap->private_data = found_dev;
 	ap->cbl = ATA_CBL_SATA;
 	ap->scsi_host = shost;
 	found_dev->sata_dev.ap = ap;

 	return 0;
 }

 void sas_ata_task_abort(struct sas_task *task)
 {
 	struct ata_queued_cmd *qc = task->uldd_task;
 	struct completion *waiting;

 	/* Bounce SCSI-initiated commands to the SCSI EH */
 	if (qc->scsicmd) {
 		scsi_req_abort_cmd(qc->scsicmd);
 		scsi_schedule_eh(qc->scsicmd->device->host);
 		return;
 	}

 	/* Internal command, fake a timeout and complete. */
 	qc->flags &= ~ATA_QCFLAG_ACTIVE;
 	qc->flags |= ATA_QCFLAG_FAILED;
 	qc->err_mask |= AC_ERR_TIMEOUT;
 	waiting = qc->private_data;
 	complete(waiting);
 }
	/*
	* Support for SATA devices on Serial Attached SCSI (SAS) controllers
	*
	* Copyright (C) 2006 IBM Corporation
	*
	* Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License as
	* published by the Free Software Foundation; either version 2 of the
	* License, or (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	* USA
	*/

	#include <scsi/sas_ata.h>
	#include "sas_internal.h"
	#include <scsi/scsi_host.h>
	#include <scsi/scsi_device.h>
	#include <scsi/scsi_tcq.h>
	#include <scsi/scsi.h>
	#include <scsi/scsi_transport.h>
	#include <scsi/scsi_transport_sas.h>
	#include "../scsi_sas_internal.h"
	#include "../scsi_transport_api.h"
	#include <scsi/scsi_eh.h>

	static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
	{
	/* Cheesy attempt to translate SAS errors into ATA. Hah! */

	/* transport error */
	if (ts->resp == SAS_TASK_UNDELIVERED)
	return AC_ERR_ATA_BUS;

	/* ts->resp == SAS_TASK_COMPLETE */
	/* task delivered, what happened afterwards? */
	switch (ts->stat) {
	case SAS_DEV_NO_RESPONSE:
	return AC_ERR_TIMEOUT;

	case SAS_INTERRUPTED:
	case SAS_PHY_DOWN:
	case SAS_NAK_R_ERR:
	return AC_ERR_ATA_BUS;


	case SAS_DATA_UNDERRUN:
	/*
	* Some programs that use the taskfile interface
	* (smartctl in particular) can cause underrun
	* problems. Ignore these errors, perhaps at our
	* peril.
	*/
	return 0;

	case SAS_DATA_OVERRUN:
	case SAS_QUEUE_FULL:
	case SAS_DEVICE_UNKNOWN:
	case SAS_SG_ERR:
	return AC_ERR_INVALID;

	case SAM_CHECK_COND:
	case SAS_OPEN_TO:
	case SAS_OPEN_REJECT:
	SAS_DPRINTK("%s: Saw error %d. What to do?\n",
	__FUNCTION__, ts->stat);
	return AC_ERR_OTHER;

	case SAS_ABORTED_TASK:
	return AC_ERR_DEV;

	case SAS_PROTO_RESPONSE:
	/* This means the ending_fis has the error
	* value; return 0 here to collect it */
	return 0;
	default:
	return 0;
	}
	}

	static void sas_ata_task_done(struct sas_task *task)
	{
	struct ata_queued_cmd *qc = task->uldd_task;
	struct domain_device *dev;
	struct task_status_struct *stat = &task->task_status;
	struct ata_task_resp resp = (struct ata_task_resp )stat->buf;
	struct sas_ha_struct *sas_ha;
	enum ata_completion_errors ac;
	unsigned long flags;

	if (!qc)
	goto qc_already_gone;

	dev = qc->ap->private_data;
	sas_ha = dev->port->ha;

	spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
	if (stat->stat == SAS_PROTO_RESPONSE \|\| stat->stat == SAM_GOOD) {
	ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
	qc->err_mask \|= ac_err_mask(dev->sata_dev.tf.command);
	dev->sata_dev.sstatus = resp->sstatus;
	dev->sata_dev.serror = resp->serror;
	dev->sata_dev.scontrol = resp->scontrol;
	} else if (stat->stat != SAM_STAT_GOOD) {
	ac = sas_to_ata_err(stat);
	if (ac) {
	SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__,
	stat->stat);
	/* We saw a SAS error. Send a vague error. */
	qc->err_mask = ac;
	dev->sata_dev.tf.feature = 0x04; /* status err */
	dev->sata_dev.tf.command = ATA_ERR;
	}
	}

	qc->lldd_task = NULL;
	if (qc->scsicmd)
	ASSIGN_SAS_TASK(qc->scsicmd, NULL);
	ata_qc_complete(qc);
	spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);

	/*
	* If the sas_task has an ata qc, a scsi_cmnd and the aborted
	* flag is set, then we must have come in via the libsas EH
	* functions. When we exit this function, we need to put the
	* scsi_cmnd on the list of finished errors. The ata_qc_complete
	* call cleans up the libata side of things but we're protected
	* from the scsi_cmnd going away because the scsi_cmnd is owned
	* by the EH, making libata's call to scsi_done a NOP.
	*/
	spin_lock_irqsave(&task->task_state_lock, flags);
	if (qc->scsicmd && task->task_state_flags & SAS_TASK_STATE_ABORTED)
	scsi_eh_finish_cmd(qc->scsicmd, &sas_ha->eh_done_q);
	spin_unlock_irqrestore(&task->task_state_lock, flags);

	qc_already_gone:
	list_del_init(&task->list);
	sas_free_task(task);
	}

	static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
	{
	int res;
	struct sas_task *task;
	struct domain_device *dev = qc->ap->private_data;
	struct sas_ha_struct *sas_ha = dev->port->ha;
	struct Scsi_Host *host = sas_ha->core.shost;
	struct sas_internal *i = to_sas_internal(host->transportt);
	struct scatterlist *sg;
	unsigned int num = 0;
	unsigned int xfer = 0;

	task = sas_alloc_task(GFP_ATOMIC);
	if (!task)
	return AC_ERR_SYSTEM;
	task->dev = dev;
	task->task_proto = SAS_PROTOCOL_STP;
	task->task_done = sas_ata_task_done;

	if (qc->tf.command == ATA_CMD_FPDMA_WRITE \|\|
	qc->tf.command == ATA_CMD_FPDMA_READ) {
	/* Need to zero out the tag libata assigned us */
	qc->tf.nsect = 0;
	}

	ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
	task->uldd_task = qc;
	if (is_atapi_taskfile(&qc->tf)) {
	memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
	task->total_xfer_len = qc->nbytes + qc->pad_len;
	task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
	} else {
	ata_for_each_sg(sg, qc) {
	num++;
	xfer += sg->length;
	}

	task->total_xfer_len = xfer;
	task->num_scatter = num;
	}

	task->data_dir = qc->dma_dir;
	task->scatter = qc->__sg;
	task->ata_task.retry_count = 1;
	task->task_state_flags = SAS_TASK_STATE_PENDING;
	qc->lldd_task = task;

	switch (qc->tf.protocol) {
	case ATA_PROT_NCQ:
	task->ata_task.use_ncq = 1;
	/* fall through */
	case ATA_PROT_ATAPI_DMA:
	case ATA_PROT_DMA:
	task->ata_task.dma_xfer = 1;
	break;
	}

	if (qc->scsicmd)
	ASSIGN_SAS_TASK(qc->scsicmd, task);

	if (sas_ha->lldd_max_execute_num < 2)
	res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
	else
	res = sas_queue_up(task);

	/* Examine */
	if (res) {
	SAS_DPRINTK("lldd_execute_task returned: %d\n", res);

	if (qc->scsicmd)
	ASSIGN_SAS_TASK(qc->scsicmd, NULL);
	sas_free_task(task);
	return AC_ERR_SYSTEM;
	}

	return 0;
	}

	static u8 sas_ata_check_status(struct ata_port *ap)
	{
	struct domain_device *dev = ap->private_data;
	return dev->sata_dev.tf.command;
	}

	static void sas_ata_phy_reset(struct ata_port *ap)
	{
	struct domain_device *dev = ap->private_data;
	struct sas_internal *i =
	to_sas_internal(dev->port->ha->core.shost->transportt);
	int res = 0;

	if (i->dft->lldd_I_T_nexus_reset)
	res = i->dft->lldd_I_T_nexus_reset(dev);

	if (res)
	SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);

	switch (dev->sata_dev.command_set) {
	case ATA_COMMAND_SET:
	SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
	ap->device[0].class = ATA_DEV_ATA;
	break;
	case ATAPI_COMMAND_SET:
	SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
	ap->device[0].class = ATA_DEV_ATAPI;
	break;
	default:
	SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
	__FUNCTION__,
	dev->sata_dev.command_set);
	ap->device[0].class = ATA_DEV_UNKNOWN;
	break;
	}

	ap->cbl = ATA_CBL_SATA;
	}

	static void sas_ata_post_internal(struct ata_queued_cmd *qc)
	{
	if (qc->flags & ATA_QCFLAG_FAILED)
	qc->err_mask \|= AC_ERR_OTHER;

	if (qc->err_mask) {
	/*
	* Find the sas_task and kill it. By this point,
	* libata has decided to kill the qc, so we needn't
	* bother with sas_ata_task_done. But we still
	* ought to abort the task.
	*/
	struct sas_task *task = qc->lldd_task;
	unsigned long flags;

	qc->lldd_task = NULL;
	if (task) {
	/* Should this be a AT(API) device reset? */
	spin_lock_irqsave(&task->task_state_lock, flags);
	task->task_state_flags \|= SAS_TASK_NEED_DEV_RESET;
	spin_unlock_irqrestore(&task->task_state_lock, flags);

	task->uldd_task = NULL;
	__sas_task_abort(task);
	}
	}
	}

	static void sas_ata_tf_read(struct ata_port ap, struct ata_taskfile tf)
	{
	struct domain_device *dev = ap->private_data;
	memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
	}

	static void sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
	u32 val)
	{
	struct domain_device *dev = ap->private_data;

	SAS_DPRINTK("STUB %s\n", __FUNCTION__);
	switch (sc_reg_in) {
	case SCR_STATUS:
	dev->sata_dev.sstatus = val;
	break;
	case SCR_CONTROL:
	dev->sata_dev.scontrol = val;
	break;
	case SCR_ERROR:
	dev->sata_dev.serror = val;
	break;
	case SCR_ACTIVE:
	dev->sata_dev.ap->sactive = val;
	break;
	}
	}

	static u32 sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
	{
	struct domain_device *dev = ap->private_data;

	SAS_DPRINTK("STUB %s\n", __FUNCTION__);
	switch (sc_reg_in) {
	case SCR_STATUS:
	return dev->sata_dev.sstatus;
	case SCR_CONTROL:
	return dev->sata_dev.scontrol;
	case SCR_ERROR:
	return dev->sata_dev.serror;
	case SCR_ACTIVE:
	return dev->sata_dev.ap->sactive;
	default:
	return 0xffffffffU;
	}
	}

	static struct ata_port_operations sas_sata_ops = {
	.port_disable = ata_port_disable,
	.check_status = sas_ata_check_status,
	.check_altstatus = sas_ata_check_status,
	.dev_select = ata_noop_dev_select,
	.phy_reset = sas_ata_phy_reset,
	.post_internal_cmd = sas_ata_post_internal,
	.tf_read = sas_ata_tf_read,
	.qc_prep = ata_noop_qc_prep,
	.qc_issue = sas_ata_qc_issue,
	.port_start = ata_sas_port_start,
	.port_stop = ata_sas_port_stop,
	.scr_read = sas_ata_scr_read,
	.scr_write = sas_ata_scr_write
	};

	static struct ata_port_info sata_port_info = {
	.flags = ATA_FLAG_SATA \| ATA_FLAG_NO_LEGACY \| ATA_FLAG_SATA_RESET \|
	ATA_FLAG_MMIO \| ATA_FLAG_PIO_DMA \| ATA_FLAG_NCQ,
	.pio_mask = 0x1f, /* PIO0-4 */
	.mwdma_mask = 0x07, /* MWDMA0-2 */
	.udma_mask = ATA_UDMA6,
	.port_ops = &sas_sata_ops
	};

	int sas_ata_init_host_and_port(struct domain_device *found_dev,
	struct scsi_target *starget)
	{
	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
	struct ata_port *ap;

	ata_host_init(&found_dev->sata_dev.ata_host,
	&ha->pcidev->dev,
	sata_port_info.flags,
	&sas_sata_ops);
	ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
	&sata_port_info,
	shost);
	if (!ap) {
	SAS_DPRINTK("ata_sas_port_alloc failed.\n");
	return -ENODEV;
	}

	ap->private_data = found_dev;
	ap->cbl = ATA_CBL_SATA;
	ap->scsi_host = shost;
	found_dev->sata_dev.ap = ap;

	return 0;
	}

	void sas_ata_task_abort(struct sas_task *task)
	{
	struct ata_queued_cmd *qc = task->uldd_task;
	struct completion *waiting;

	/* Bounce SCSI-initiated commands to the SCSI EH */
	if (qc->scsicmd) {
	scsi_req_abort_cmd(qc->scsicmd);
	scsi_schedule_eh(qc->scsicmd->device->host);
	return;
	}

	/* Internal command, fake a timeout and complete. */
	qc->flags &= ~ATA_QCFLAG_ACTIVE;
	qc->flags \|= ATA_QCFLAG_FAILED;
	qc->err_mask \|= AC_ERR_TIMEOUT;
	waiting = qc->private_data;
	complete(waiting);
	}