[SCSI] Migrate libsas ATA code into a separate file

This is a respin of my earlier patch that migrates the ATA support code
into a separate file.  For now, the controversial linking bits have
been removed per James Bottomley's request for a patch that contains
only the migration diffs, which means that libsas continues to require
libata.  I intend to address that problem in a separate patch.

This patch is against the aic94xx-sas-2.6 git tree, and it has been
sanity tested on my x206m with Seagate SATA and SAS disks without
uncovering any new problems.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 6 insertions, 307 deletions

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 0dc7c02b383..dbc2a912114 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -34,6 +34,7 @@
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_transport.h>
 #include <scsi/scsi_transport_sas.h>
+#include <scsi/sas_ata.h>
 #include "../scsi_sas_internal.h"
 #include "../scsi_transport_api.h"
 #include "../scsi_priv.h"
@@ -173,7 +174,7 @@ static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 	return task;
 }
 
-static int sas_queue_up(struct sas_task *task)
+int sas_queue_up(struct sas_task *task)
 {
 	struct sas_ha_struct *sas_ha = task->dev->port->ha;
 	struct scsi_core *core = &sas_ha->core;
@@ -193,11 +194,6 @@ static int sas_queue_up(struct sas_task *task)
 	return 0;
 }
 
-static inline int dev_is_sata(struct domain_device *dev)
-{
-	return (dev->rphy->identify.target_port_protocols & SAS_PROTOCOL_SATA);
-}
-
 /**
  * sas_queuecommand -- Enqueue a command for processing
  * @parameters: See SCSI Core documentation
@@ -696,93 +692,6 @@ enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 	return EH_NOT_HANDLED;
 }
 
-
-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 = qc->ap->private_data;
-	struct task_status_struct *stat = &task->task_status;
-	struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
-	enum ata_completion_errors ac;
-
-	if (stat->stat == SAS_PROTO_RESPONSE) {
-		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;
-		dev->sata_dev.ap->sactive = resp->sactive;
-	} 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;
-		}
-	}
-
-	ata_qc_complete(qc);
-	list_del_init(&task->list);
-	sas_free_task(task);
-}
-
 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 {
 	struct domain_device *dev = sdev_to_domain_dev(sdev);
@@ -793,200 +702,6 @@ int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 	return -EINVAL;
 }
 
-static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
-{
-	int res = -ENOMEM;
-	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)
-		goto out;
-	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;
-
-	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 (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);
-
-		sas_free_task(task);
-		if (res == -SAS_QUEUE_FULL)
-			return -ENOMEM;
-	}
-
-out:
-	return res;
-}
-
-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_ATA;
-			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)
-		SAS_DPRINTK("%s: Failure; reset phy!\n", __FUNCTION__);
-}
-
-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
-};
-
 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 {
 	struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
@@ -1025,32 +740,16 @@ static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 
 int sas_target_alloc(struct scsi_target *starget)
 {
-	struct Scsi_Host *shost = dev_to_shost(&starget->dev);
-	struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 	struct domain_device *found_dev = sas_find_target(starget);
+	int res;
 
 	if (!found_dev)
 		return -ENODEV;
 
 	if (dev_is_sata(found_dev)) {
-		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;
+		res = sas_ata_init_host_and_port(found_dev, starget);
+		if (res)
+			return res;
 	}
 
 	starget->hostdata = found_dev;