Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5188 insertions, 0 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
new file mode 100644
index 000000000..0950d6fda
--- /dev/null
+++ b/drivers/ata/libata-scsi.c
@@ -0,0 +1,5188 @@
+/*
+ *  libata-scsi.c - helper library for ATA
+ *
+ *  Maintained by:  Tejun Heo <tj@kernel.org>
+ *    		    Please ALWAYS copy linux-ide@vger.kernel.org
+ *		    on emails.
+ *
+ *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
+ *  Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ *  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, 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; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ *  libata documentation is available via 'make {ps|pdf}docs',
+ *  as Documentation/driver-api/libata.rst
+ *
+ *  Hardware documentation available from
+ *  - http://www.t10.org/
+ *  - http://www.t13.org/
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <linux/export.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport.h>
+#include <linux/libata.h>
+#include <linux/hdreg.h>
+#include <linux/uaccess.h>
+#include <linux/suspend.h>
+#include <asm/unaligned.h>
+#include <linux/ioprio.h>
+
+#include "libata.h"
+#include "libata-transport.h"
+
+#define ATA_SCSI_RBUF_SIZE	4096
+
+static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
+static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
+
+typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
+
+static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
+					const struct scsi_device *scsidev);
+static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
+					    const struct scsi_device *scsidev);
+
+#define RW_RECOVERY_MPAGE 0x1
+#define RW_RECOVERY_MPAGE_LEN 12
+#define CACHE_MPAGE 0x8
+#define CACHE_MPAGE_LEN 20
+#define CONTROL_MPAGE 0xa
+#define CONTROL_MPAGE_LEN 12
+#define ALL_MPAGES 0x3f
+#define ALL_SUB_MPAGES 0xff
+
+
+static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
+	RW_RECOVERY_MPAGE,
+	RW_RECOVERY_MPAGE_LEN - 2,
+	(1 << 7),	/* AWRE */
+	0,		/* read retry count */
+	0, 0, 0, 0,
+	0,		/* write retry count */
+	0, 0, 0
+};
+
+static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
+	CACHE_MPAGE,
+	CACHE_MPAGE_LEN - 2,
+	0,		/* contains WCE, needs to be 0 for logic */
+	0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0,		/* contains DRA, needs to be 0 for logic */
+	0, 0, 0, 0, 0, 0, 0
+};
+
+static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
+	CONTROL_MPAGE,
+	CONTROL_MPAGE_LEN - 2,
+	2,	/* DSENSE=0, GLTSD=1 */
+	0,	/* [QAM+QERR may be 1, see 05-359r1] */
+	0, 0, 0, 0, 0xff, 0xff,
+	0, 30	/* extended self test time, see 05-359r1 */
+};
+
+static const char *ata_lpm_policy_names[] = {
+	[ATA_LPM_UNKNOWN]		= "max_performance",
+	[ATA_LPM_MAX_POWER]		= "max_performance",
+	[ATA_LPM_MED_POWER]		= "medium_power",
+	[ATA_LPM_MED_POWER_WITH_DIPM]	= "med_power_with_dipm",
+	[ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial",
+	[ATA_LPM_MIN_POWER]		= "min_power",
+};
+
+static ssize_t ata_scsi_lpm_store(struct device *device,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct Scsi_Host *shost = class_to_shost(device);
+	struct ata_port *ap = ata_shost_to_port(shost);
+	struct ata_link *link;
+	struct ata_device *dev;
+	enum ata_lpm_policy policy;
+	unsigned long flags;
+
+	/* UNKNOWN is internal state, iterate from MAX_POWER */
+	for (policy = ATA_LPM_MAX_POWER;
+	     policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
+		const char *name = ata_lpm_policy_names[policy];
+
+		if (strncmp(name, buf, strlen(name)) == 0)
+			break;
+	}
+	if (policy == ARRAY_SIZE(ata_lpm_policy_names))
+		return -EINVAL;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	ata_for_each_link(link, ap, EDGE) {
+		ata_for_each_dev(dev, &ap->link, ENABLED) {
+			if (dev->horkage & ATA_HORKAGE_NOLPM) {
+				count = -EOPNOTSUPP;
+				goto out_unlock;
+			}
+		}
+	}
+
+	ap->target_lpm_policy = policy;
+	ata_port_schedule_eh(ap);
+out_unlock:
+	spin_unlock_irqrestore(ap->lock, flags);
+	return count;
+}
+
+static ssize_t ata_scsi_lpm_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
+		return -EINVAL;
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			ata_lpm_policy_names[ap->target_lpm_policy]);
+}
+DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
+	    ata_scsi_lpm_show, ata_scsi_lpm_store);
+EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
+
+static ssize_t ata_scsi_park_show(struct device *device,
+				  struct device_attribute *attr, char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_link *link;
+	struct ata_device *dev;
+	unsigned long now;
+	unsigned int uninitialized_var(msecs);
+	int rc = 0;
+
+	ap = ata_shost_to_port(sdev->host);
+
+	spin_lock_irq(ap->lock);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev) {
+		rc = -ENODEV;
+		goto unlock;
+	}
+	if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
+		rc = -EOPNOTSUPP;
+		goto unlock;
+	}
+
+	link = dev->link;
+	now = jiffies;
+	if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
+	    link->eh_context.unloaded_mask & (1 << dev->devno) &&
+	    time_after(dev->unpark_deadline, now))
+		msecs = jiffies_to_msecs(dev->unpark_deadline - now);
+	else
+		msecs = 0;
+
+unlock:
+	spin_unlock_irq(ap->lock);
+
+	return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
+}
+
+static ssize_t ata_scsi_park_store(struct device *device,
+				   struct device_attribute *attr,
+				   const char *buf, size_t len)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_device *dev;
+	long int input;
+	unsigned long flags;
+	int rc;
+
+	rc = kstrtol(buf, 10, &input);
+	if (rc)
+		return rc;
+	if (input < -2)
+		return -EINVAL;
+	if (input > ATA_TMOUT_MAX_PARK) {
+		rc = -EOVERFLOW;
+		input = ATA_TMOUT_MAX_PARK;
+	}
+
+	ap = ata_shost_to_port(sdev->host);
+
+	spin_lock_irqsave(ap->lock, flags);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (unlikely(!dev)) {
+		rc = -ENODEV;
+		goto unlock;
+	}
+	if (dev->class != ATA_DEV_ATA &&
+	    dev->class != ATA_DEV_ZAC) {
+		rc = -EOPNOTSUPP;
+		goto unlock;
+	}
+
+	if (input >= 0) {
+		if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
+			rc = -EOPNOTSUPP;
+			goto unlock;
+		}
+
+		dev->unpark_deadline = ata_deadline(jiffies, input);
+		dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
+		ata_port_schedule_eh(ap);
+		complete(&ap->park_req_pending);
+	} else {
+		switch (input) {
+		case -1:
+			dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
+			break;
+		case -2:
+			dev->flags |= ATA_DFLAG_NO_UNLOAD;
+			break;
+		}
+	}
+unlock:
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	return rc ? rc : len;
+}
+DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
+	    ata_scsi_park_show, ata_scsi_park_store);
+EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
+
+static ssize_t ata_ncq_prio_enable_show(struct device *device,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_device *dev;
+	bool ncq_prio_enable;
+	int rc = 0;
+
+	ap = ata_shost_to_port(sdev->host);
+
+	spin_lock_irq(ap->lock);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev) {
+		rc = -ENODEV;
+		goto unlock;
+	}
+
+	ncq_prio_enable = dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLE;
+
+unlock:
+	spin_unlock_irq(ap->lock);
+
+	return rc ? rc : snprintf(buf, 20, "%u\n", ncq_prio_enable);
+}
+
+static ssize_t ata_ncq_prio_enable_store(struct device *device,
+					 struct device_attribute *attr,
+					 const char *buf, size_t len)
+{
+	struct scsi_device *sdev = to_scsi_device(device);
+	struct ata_port *ap;
+	struct ata_device *dev;
+	long int input;
+	int rc;
+
+	rc = kstrtol(buf, 10, &input);
+	if (rc)
+		return rc;
+	if ((input < 0) || (input > 1))
+		return -EINVAL;
+
+	ap = ata_shost_to_port(sdev->host);
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (unlikely(!dev))
+		return  -ENODEV;
+
+	spin_lock_irq(ap->lock);
+	if (input)
+		dev->flags |= ATA_DFLAG_NCQ_PRIO_ENABLE;
+	else
+		dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+
+	dev->link->eh_info.action |= ATA_EH_REVALIDATE;
+	dev->link->eh_info.flags |= ATA_EHI_QUIET;
+	ata_port_schedule_eh(ap);
+	spin_unlock_irq(ap->lock);
+
+	ata_port_wait_eh(ap);
+
+	if (input) {
+		spin_lock_irq(ap->lock);
+		if (!(dev->flags & ATA_DFLAG_NCQ_PRIO)) {
+			dev->flags &= ~ATA_DFLAG_NCQ_PRIO_ENABLE;
+			rc = -EIO;
+		}
+		spin_unlock_irq(ap->lock);
+	}
+
+	return rc ? rc : len;
+}
+
+DEVICE_ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
+	    ata_ncq_prio_enable_show, ata_ncq_prio_enable_store);
+EXPORT_SYMBOL_GPL(dev_attr_ncq_prio_enable);
+
+void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
+			u8 sk, u8 asc, u8 ascq)
+{
+	bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
+
+	if (!cmd)
+		return;
+
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	scsi_build_sense_buffer(d_sense, cmd->sense_buffer, sk, asc, ascq);
+}
+
+void ata_scsi_set_sense_information(struct ata_device *dev,
+				    struct scsi_cmnd *cmd,
+				    const struct ata_taskfile *tf)
+{
+	u64 information;
+
+	if (!cmd)
+		return;
+
+	information = ata_tf_read_block(tf, dev);
+	if (information == U64_MAX)
+		return;
+
+	scsi_set_sense_information(cmd->sense_buffer,
+				   SCSI_SENSE_BUFFERSIZE, information);
+}
+
+static void ata_scsi_set_invalid_field(struct ata_device *dev,
+				       struct scsi_cmnd *cmd, u16 field, u8 bit)
+{
+	ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0);
+	/* "Invalid field in CDB" */
+	scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
+				     field, bit, 1);
+}
+
+static void ata_scsi_set_invalid_parameter(struct ata_device *dev,
+					   struct scsi_cmnd *cmd, u16 field)
+{
+	/* "Invalid field in parameter list" */
+	ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0);
+	scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
+				     field, 0xff, 0);
+}
+
+static ssize_t
+ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+	if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
+		return ap->ops->em_store(ap, buf, count);
+	return -EINVAL;
+}
+
+static ssize_t
+ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
+		return ap->ops->em_show(ap, buf);
+	return -EINVAL;
+}
+DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
+		ata_scsi_em_message_show, ata_scsi_em_message_store);
+EXPORT_SYMBOL_GPL(dev_attr_em_message);
+
+static ssize_t
+ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	struct Scsi_Host *shost = class_to_shost(dev);
+	struct ata_port *ap = ata_shost_to_port(shost);
+
+	return snprintf(buf, 23, "%d\n", ap->em_message_type);
+}
+DEVICE_ATTR(em_message_type, S_IRUGO,
+		  ata_scsi_em_message_type_show, NULL);
+EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
+
+static ssize_t
+ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
+
+	if (atadev && ap->ops->sw_activity_show &&
+	    (ap->flags & ATA_FLAG_SW_ACTIVITY))
+		return ap->ops->sw_activity_show(atadev, buf);
+	return -EINVAL;
+}
+
+static ssize_t
+ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
+	const char *buf, size_t count)
+{
+	struct scsi_device *sdev = to_scsi_device(dev);
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
+	enum sw_activity val;
+	int rc;
+
+	if (atadev && ap->ops->sw_activity_store &&
+	    (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
+		val = simple_strtoul(buf, NULL, 0);
+		switch (val) {
+		case OFF: case BLINK_ON: case BLINK_OFF:
+			rc = ap->ops->sw_activity_store(atadev, val);
+			if (!rc)
+				return count;
+			else
+				return rc;
+		}
+	}
+	return -EINVAL;
+}
+DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
+			ata_scsi_activity_store);
+EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
+
+struct device_attribute *ata_common_sdev_attrs[] = {
+	&dev_attr_unload_heads,
+	&dev_attr_ncq_prio_enable,
+	NULL
+};
+EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
+
+/**
+ *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
+ *	@sdev: SCSI device for which BIOS geometry is to be determined
+ *	@bdev: block device associated with @sdev
+ *	@capacity: capacity of SCSI device
+ *	@geom: location to which geometry will be output
+ *
+ *	Generic bios head/sector/cylinder calculator
+ *	used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
+ *	mapping. Some situations may arise where the disk is not
+ *	bootable if this is not used.
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
+		       sector_t capacity, int geom[])
+{
+	geom[0] = 255;
+	geom[1] = 63;
+	sector_div(capacity, 255*63);
+	geom[2] = capacity;
+
+	return 0;
+}
+
+/**
+ *	ata_scsi_unlock_native_capacity - unlock native capacity
+ *	@sdev: SCSI device to adjust device capacity for
+ *
+ *	This function is called if a partition on @sdev extends beyond
+ *	the end of the device.  It requests EH to unlock HPA.
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  Might sleep.
+ */
+void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (dev && dev->n_sectors < dev->n_native_sectors) {
+		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
+		dev->link->eh_info.action |= ATA_EH_RESET;
+		ata_port_schedule_eh(ap);
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+	ata_port_wait_eh(ap);
+}
+
+/**
+ *	ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
+ *	@ap: target port
+ *	@sdev: SCSI device to get identify data for
+ *	@arg: User buffer area for identify data
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno on error.
+ */
+static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
+			    void __user *arg)
+{
+	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+	u16 __user *dst = arg;
+	char buf[40];
+
+	if (!dev)
+		return -ENOMSG;
+
+	if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
+		return -EFAULT;
+
+	ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
+	if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
+		return -EFAULT;
+
+	ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
+	if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
+		return -EFAULT;
+
+	ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
+	if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
+		return -EFAULT;
+
+	return 0;
+}
+
+/**
+ *	ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
+ *	@scsidev: Device to which we are issuing command
+ *	@arg: User provided data for issuing command
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno on error.
+ */
+int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
+{
+	int rc = 0;
+	u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
+	u8 scsi_cmd[MAX_COMMAND_SIZE];
+	u8 args[4], *argbuf = NULL;
+	int argsize = 0;
+	enum dma_data_direction data_dir;
+	struct scsi_sense_hdr sshdr;
+	int cmd_result;
+
+	if (arg == NULL)
+		return -EINVAL;
+
+	if (copy_from_user(args, arg, sizeof(args)))
+		return -EFAULT;
+
+	memset(sensebuf, 0, sizeof(sensebuf));
+	memset(scsi_cmd, 0, sizeof(scsi_cmd));
+
+	if (args[3]) {
+		argsize = ATA_SECT_SIZE * args[3];
+		argbuf = kmalloc(argsize, GFP_KERNEL);
+		if (argbuf == NULL) {
+			rc = -ENOMEM;
+			goto error;
+		}
+
+		scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
+		scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
+					    block count in sector count field */
+		data_dir = DMA_FROM_DEVICE;
+	} else {
+		scsi_cmd[1]  = (3 << 1); /* Non-data */
+		scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
+		data_dir = DMA_NONE;
+	}
+
+	scsi_cmd[0] = ATA_16;
+
+	scsi_cmd[4] = args[2];
+	if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
+		scsi_cmd[6]  = args[3];
+		scsi_cmd[8]  = args[1];
+		scsi_cmd[10] = 0x4f;
+		scsi_cmd[12] = 0xc2;
+	} else {
+		scsi_cmd[6]  = args[1];
+	}
+	scsi_cmd[14] = args[0];
+
+	/* Good values for timeout and retries?  Values below
+	   from scsi_ioctl_send_command() for default case... */
+	cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
+				  sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL);
+
+	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+		u8 *desc = sensebuf + 8;
+		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
+
+		/* If we set cc then ATA pass-through will cause a
+		 * check condition even if no error. Filter that. */
+		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
+			if (sshdr.sense_key == RECOVERED_ERROR &&
+			    sshdr.asc == 0 && sshdr.ascq == 0x1d)
+				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
+		}
+
+		/* Send userspace a few ATA registers (same as drivers/ide) */
+		if (sensebuf[0] == 0x72 &&	/* format is "descriptor" */
+		    desc[0] == 0x09) {		/* code is "ATA Descriptor" */
+			args[0] = desc[13];	/* status */
+			args[1] = desc[3];	/* error */
+			args[2] = desc[5];	/* sector count (0:7) */
+			if (copy_to_user(arg, args, sizeof(args)))
+				rc = -EFAULT;
+		}
+	}
+
+
+	if (cmd_result) {
+		rc = -EIO;
+		goto error;
+	}
+
+	if ((argbuf)
+	 && copy_to_user(arg + sizeof(args), argbuf, argsize))
+		rc = -EFAULT;
+error:
+	kfree(argbuf);
+	return rc;
+}
+
+/**
+ *	ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
+ *	@scsidev: Device to which we are issuing command
+ *	@arg: User provided data for issuing command
+ *
+ *	LOCKING:
+ *	Defined by the SCSI layer.  We don't really care.
+ *
+ *	RETURNS:
+ *	Zero on success, negative errno on error.
+ */
+int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
+{
+	int rc = 0;
+	u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
+	u8 scsi_cmd[MAX_COMMAND_SIZE];
+	u8 args[7];
+	struct scsi_sense_hdr sshdr;
+	int cmd_result;
+
+	if (arg == NULL)
+		return -EINVAL;
+
+	if (copy_from_user(args, arg, sizeof(args)))
+		return -EFAULT;
+
+	memset(sensebuf, 0, sizeof(sensebuf));
+	memset(scsi_cmd, 0, sizeof(scsi_cmd));
+	scsi_cmd[0]  = ATA_16;
+	scsi_cmd[1]  = (3 << 1); /* Non-data */
+	scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
+	scsi_cmd[4]  = args[1];
+	scsi_cmd[6]  = args[2];
+	scsi_cmd[8]  = args[3];
+	scsi_cmd[10] = args[4];
+	scsi_cmd[12] = args[5];
+	scsi_cmd[13] = args[6] & 0x4f;
+	scsi_cmd[14] = args[0];
+
+	/* Good values for timeout and retries?  Values below
+	   from scsi_ioctl_send_command() for default case... */
+	cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
+				sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL);
+
+	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+		u8 *desc = sensebuf + 8;
+		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
+
+		/* If we set cc then ATA pass-through will cause a
+		 * check condition even if no error. Filter that. */
+		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
+			if (sshdr.sense_key == RECOVERED_ERROR &&
+			    sshdr.asc == 0 && sshdr.ascq == 0x1d)
+				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
+		}
+
+		/* Send userspace ATA registers */
+		if (sensebuf[0] == 0x72 &&	/* format is "descriptor" */
+				desc[0] == 0x09) {/* code is "ATA Descriptor" */
+			args[0] = desc[13];	/* status */
+			args[1] = desc[3];	/* error */
+			args[2] = desc[5];	/* sector count (0:7) */
+			args[3] = desc[7];	/* lbal */
+			args[4] = desc[9];	/* lbam */
+			args[5] = desc[11];	/* lbah */
+			args[6] = desc[12];	/* select */
+			if (copy_to_user(arg, args, sizeof(args)))
+				rc = -EFAULT;
+		}
+	}
+
+	if (cmd_result) {
+		rc = -EIO;
+		goto error;
+	}
+
+ error:
+	return rc;
+}
+
+static int ata_ioc32(struct ata_port *ap)
+{
+	if (ap->flags & ATA_FLAG_PIO_DMA)
+		return 1;
+	if (ap->pflags & ATA_PFLAG_PIO32)
+		return 1;
+	return 0;
+}
+
+int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
+		     int cmd, void __user *arg)
+{
+	unsigned long val;
+	int rc = -EINVAL;
+	unsigned long flags;
+
+	switch (cmd) {
+	case HDIO_GET_32BIT:
+		spin_lock_irqsave(ap->lock, flags);
+		val = ata_ioc32(ap);
+		spin_unlock_irqrestore(ap->lock, flags);
+		return put_user(val, (unsigned long __user *)arg);
+
+	case HDIO_SET_32BIT:
+		val = (unsigned long) arg;
+		rc = 0;
+		spin_lock_irqsave(ap->lock, flags);
+		if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
+			if (val)
+				ap->pflags |= ATA_PFLAG_PIO32;
+			else
+				ap->pflags &= ~ATA_PFLAG_PIO32;
+		} else {
+			if (val != ata_ioc32(ap))
+				rc = -EINVAL;
+		}
+		spin_unlock_irqrestore(ap->lock, flags);
+		return rc;
+
+	case HDIO_GET_IDENTITY:
+		return ata_get_identity(ap, scsidev, arg);
+
+	case HDIO_DRIVE_CMD:
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return ata_cmd_ioctl(scsidev, arg);
+
+	case HDIO_DRIVE_TASK:
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return ata_task_ioctl(scsidev, arg);
+
+	default:
+		rc = -ENOTTY;
+		break;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
+
+int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
+{
+	return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
+				scsidev, cmd, arg);
+}
+EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
+
+/**
+ *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
+ *	@dev: ATA device to which the new command is attached
+ *	@cmd: SCSI command that originated this ATA command
+ *
+ *	Obtain a reference to an unused ata_queued_cmd structure,
+ *	which is the basic libata structure representing a single
+ *	ATA command sent to the hardware.
+ *
+ *	If a command was available, fill in the SCSI-specific
+ *	portions of the structure with information on the
+ *	current command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Command allocated, or %NULL if none available.
+ */
+static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
+					      struct scsi_cmnd *cmd)
+{
+	struct ata_queued_cmd *qc;
+
+	qc = ata_qc_new_init(dev, cmd->request->tag);
+	if (qc) {
+		qc->scsicmd = cmd;
+		qc->scsidone = cmd->scsi_done;
+
+		qc->sg = scsi_sglist(cmd);
+		qc->n_elem = scsi_sg_count(cmd);
+
+		if (cmd->request->rq_flags & RQF_QUIET)
+			qc->flags |= ATA_QCFLAG_QUIET;
+	} else {
+		cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
+		cmd->scsi_done(cmd);
+	}
+
+	return qc;
+}
+
+static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+
+	qc->extrabytes = scmd->request->extra_len;
+	qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
+}
+
+/**
+ *	ata_dump_status - user friendly display of error info
+ *	@id: id of the port in question
+ *	@tf: ptr to filled out taskfile
+ *
+ *	Decode and dump the ATA error/status registers for the user so
+ *	that they have some idea what really happened at the non
+ *	make-believe layer.
+ *
+ *	LOCKING:
+ *	inherited from caller
+ */
+static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
+{
+	u8 stat = tf->command, err = tf->feature;
+
+	pr_warn("ata%u: status=0x%02x { ", id, stat);
+	if (stat & ATA_BUSY) {
+		pr_cont("Busy }\n");	/* Data is not valid in this case */
+	} else {
+		if (stat & ATA_DRDY)	pr_cont("DriveReady ");
+		if (stat & ATA_DF)	pr_cont("DeviceFault ");
+		if (stat & ATA_DSC)	pr_cont("SeekComplete ");
+		if (stat & ATA_DRQ)	pr_cont("DataRequest ");
+		if (stat & ATA_CORR)	pr_cont("CorrectedError ");
+		if (stat & ATA_SENSE)	pr_cont("Sense ");
+		if (stat & ATA_ERR)	pr_cont("Error ");
+		pr_cont("}\n");
+
+		if (err) {
+			pr_warn("ata%u: error=0x%02x { ", id, err);
+			if (err & ATA_ABORTED)	pr_cont("DriveStatusError ");
+			if (err & ATA_ICRC) {
+				if (err & ATA_ABORTED)
+						pr_cont("BadCRC ");
+				else		pr_cont("Sector ");
+			}
+			if (err & ATA_UNC)	pr_cont("UncorrectableError ");
+			if (err & ATA_IDNF)	pr_cont("SectorIdNotFound ");
+			if (err & ATA_TRK0NF)	pr_cont("TrackZeroNotFound ");
+			if (err & ATA_AMNF)	pr_cont("AddrMarkNotFound ");
+			pr_cont("}\n");
+		}
+	}
+}
+
+/**
+ *	ata_to_sense_error - convert ATA error to SCSI error
+ *	@id: ATA device number
+ *	@drv_stat: value contained in ATA status register
+ *	@drv_err: value contained in ATA error register
+ *	@sk: the sense key we'll fill out
+ *	@asc: the additional sense code we'll fill out
+ *	@ascq: the additional sense code qualifier we'll fill out
+ *	@verbose: be verbose
+ *
+ *	Converts an ATA error into a SCSI error.  Fill out pointers to
+ *	SK, ASC, and ASCQ bytes for later use in fixed or descriptor
+ *	format sense blocks.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
+			       u8 *asc, u8 *ascq, int verbose)
+{
+	int i;
+
+	/* Based on the 3ware driver translation table */
+	static const unsigned char sense_table[][4] = {
+		/* BBD|ECC|ID|MAR */
+		{0xd1,		ABORTED_COMMAND, 0x00, 0x00},
+			// Device busy                  Aborted command
+		/* BBD|ECC|ID */
+		{0xd0,		ABORTED_COMMAND, 0x00, 0x00},
+			// Device busy                  Aborted command
+		/* ECC|MC|MARK */
+		{0x61,		HARDWARE_ERROR, 0x00, 0x00},
+			// Device fault                 Hardware error
+		/* ICRC|ABRT */		/* NB: ICRC & !ABRT is BBD */
+		{0x84,		ABORTED_COMMAND, 0x47, 0x00},
+			// Data CRC error               SCSI parity error
+		/* MC|ID|ABRT|TRK0|MARK */
+		{0x37,		NOT_READY, 0x04, 0x00},
+			// Unit offline                 Not ready
+		/* MCR|MARK */
+		{0x09,		NOT_READY, 0x04, 0x00},
+			// Unrecovered disk error       Not ready
+		/*  Bad address mark */
+		{0x01,		MEDIUM_ERROR, 0x13, 0x00},
+			// Address mark not found for data field
+		/* TRK0 - Track 0 not found */
+		{0x02,		HARDWARE_ERROR, 0x00, 0x00},
+			// Hardware error
+		/* Abort: 0x04 is not translated here, see below */
+		/* Media change request */
+		{0x08,		NOT_READY, 0x04, 0x00},
+			// FIXME: faking offline
+		/* SRV/IDNF - ID not found */
+		{0x10,		ILLEGAL_REQUEST, 0x21, 0x00},
+			// Logical address out of range
+		/* MC - Media Changed */
+		{0x20,		UNIT_ATTENTION, 0x28, 0x00},
+			// Not ready to ready change, medium may have changed
+		/* ECC - Uncorrectable ECC error */
+		{0x40,		MEDIUM_ERROR, 0x11, 0x04},
+			// Unrecovered read error
+		/* BBD - block marked bad */
+		{0x80,		MEDIUM_ERROR, 0x11, 0x04},
+			// Block marked bad	Medium error, unrecovered read error
+		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
+	};
+	static const unsigned char stat_table[][4] = {
+		/* Must be first because BUSY means no other bits valid */
+		{0x80,		ABORTED_COMMAND, 0x47, 0x00},
+		// Busy, fake parity for now
+		{0x40,		ILLEGAL_REQUEST, 0x21, 0x04},
+		// Device ready, unaligned write command
+		{0x20,		HARDWARE_ERROR,  0x44, 0x00},
+		// Device fault, internal target failure
+		{0x08,		ABORTED_COMMAND, 0x47, 0x00},
+		// Timed out in xfer, fake parity for now
+		{0x04,		RECOVERED_ERROR, 0x11, 0x00},
+		// Recovered ECC error	  Medium error, recovered
+		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
+	};
+
+	/*
+	 *	Is this an error we can process/parse
+	 */
+	if (drv_stat & ATA_BUSY) {
+		drv_err = 0;	/* Ignore the err bits, they're invalid */
+	}
+
+	if (drv_err) {
+		/* Look for drv_err */
+		for (i = 0; sense_table[i][0] != 0xFF; i++) {
+			/* Look for best matches first */
+			if ((sense_table[i][0] & drv_err) ==
+			    sense_table[i][0]) {
+				*sk = sense_table[i][1];
+				*asc = sense_table[i][2];
+				*ascq = sense_table[i][3];
+				goto translate_done;
+			}
+		}
+	}
+
+	/*
+	 * Fall back to interpreting status bits.  Note that if the drv_err
+	 * has only the ABRT bit set, we decode drv_stat.  ABRT by itself
+	 * is not descriptive enough.
+	 */
+	for (i = 0; stat_table[i][0] != 0xFF; i++) {
+		if (stat_table[i][0] & drv_stat) {
+			*sk = stat_table[i][1];
+			*asc = stat_table[i][2];
+			*ascq = stat_table[i][3];
+			goto translate_done;
+		}
+	}
+
+	/*
+	 * We need a sensible error return here, which is tricky, and one
+	 * that won't cause people to do things like return a disk wrongly.
+	 */
+	*sk = ABORTED_COMMAND;
+	*asc = 0x00;
+	*ascq = 0x00;
+
+ translate_done:
+	if (verbose)
+		pr_err("ata%u: translated ATA stat/err 0x%02x/%02x to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
+		       id, drv_stat, drv_err, *sk, *asc, *ascq);
+	return;
+}
+
+/*
+ *	ata_gen_passthru_sense - Generate check condition sense block.
+ *	@qc: Command that completed.
+ *
+ *	This function is specific to the ATA descriptor format sense
+ *	block specified for the ATA pass through commands.  Regardless
+ *	of whether the command errored or not, return a sense
+ *	block. Copy all controller registers into the sense
+ *	block. If there was no error, we get the request from an ATA
+ *	passthrough command, so we use the following sense data:
+ *	sk = RECOVERED ERROR
+ *	asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
+ *      
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->result_tf;
+	unsigned char *sb = cmd->sense_buffer;
+	unsigned char *desc = sb + 8;
+	int verbose = qc->ap->ops->error_handler == NULL;
+	u8 sense_key, asc, ascq;
+
+	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	/*
+	 * Use ata_to_sense_error() to map status register bits
+	 * onto sense key, asc & ascq.
+	 */
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
+				   &sense_key, &asc, &ascq, verbose);
+		ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
+	} else {
+		/*
+		 * ATA PASS-THROUGH INFORMATION AVAILABLE
+		 * Always in descriptor format sense.
+		 */
+		scsi_build_sense_buffer(1, cmd->sense_buffer,
+					RECOVERED_ERROR, 0, 0x1D);
+	}
+
+	if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) {
+		u8 len;
+
+		/* descriptor format */
+		len = sb[7];
+		desc = (char *)scsi_sense_desc_find(sb, len + 8, 9);
+		if (!desc) {
+			if (SCSI_SENSE_BUFFERSIZE < len + 14)
+				return;
+			sb[7] = len + 14;
+			desc = sb + 8 + len;
+		}
+		desc[0] = 9;
+		desc[1] = 12;
+		/*
+		 * Copy registers into sense buffer.
+		 */
+		desc[2] = 0x00;
+		desc[3] = tf->feature;	/* == error reg */
+		desc[5] = tf->nsect;
+		desc[7] = tf->lbal;
+		desc[9] = tf->lbam;
+		desc[11] = tf->lbah;
+		desc[12] = tf->device;
+		desc[13] = tf->command; /* == status reg */
+
+		/*
+		 * Fill in Extend bit, and the high order bytes
+		 * if applicable.
+		 */
+		if (tf->flags & ATA_TFLAG_LBA48) {
+			desc[2] |= 0x01;
+			desc[4] = tf->hob_nsect;
+			desc[6] = tf->hob_lbal;
+			desc[8] = tf->hob_lbam;
+			desc[10] = tf->hob_lbah;
+		}
+	} else {
+		/* Fixed sense format */
+		desc[0] = tf->feature;
+		desc[1] = tf->command; /* status */
+		desc[2] = tf->device;
+		desc[3] = tf->nsect;
+		desc[7] = 0;
+		if (tf->flags & ATA_TFLAG_LBA48)  {
+			desc[8] |= 0x80;
+			if (tf->hob_nsect)
+				desc[8] |= 0x40;
+			if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah)
+				desc[8] |= 0x20;
+		}
+		desc[9] = tf->lbal;
+		desc[10] = tf->lbam;
+		desc[11] = tf->lbah;
+	}
+}
+
+/**
+ *	ata_gen_ata_sense - generate a SCSI fixed sense block
+ *	@qc: Command that we are erroring out
+ *
+ *	Generate sense block for a failed ATA command @qc.  Descriptor
+ *	format is used to accommodate LBA48 block address.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
+{
+	struct ata_device *dev = qc->dev;
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->result_tf;
+	unsigned char *sb = cmd->sense_buffer;
+	int verbose = qc->ap->ops->error_handler == NULL;
+	u64 block;
+	u8 sense_key, asc, ascq;
+
+	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+	if (ata_dev_disabled(dev)) {
+		/* Device disabled after error recovery */
+		/* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */
+		ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
+		return;
+	}
+	/* Use ata_to_sense_error() to map status register bits
+	 * onto sense key, asc & ascq.
+	 */
+	if (qc->err_mask ||
+	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
+				   &sense_key, &asc, &ascq, verbose);
+		ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq);
+	} else {
+		/* Could not decode error */
+		ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n",
+			     tf->command, qc->err_mask);
+		ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0);
+		return;
+	}
+
+	block = ata_tf_read_block(&qc->result_tf, dev);
+	if (block == U64_MAX)
+		return;
+
+	scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
+}
+
+static void ata_scsi_sdev_config(struct scsi_device *sdev)
+{
+	sdev->use_10_for_rw = 1;
+	sdev->use_10_for_ms = 1;
+	sdev->no_write_same = 1;
+
+	/* Schedule policy is determined by ->qc_defer() callback and
+	 * it needs to see every deferred qc.  Set dev_blocked to 1 to
+	 * prevent SCSI midlayer from automatically deferring
+	 * requests.
+	 */
+	sdev->max_device_blocked = 1;
+}
+
+/**
+ *	atapi_drain_needed - Check whether data transfer may overflow
+ *	@rq: request to be checked
+ *
+ *	ATAPI commands which transfer variable length data to host
+ *	might overflow due to application error or hardware bug.  This
+ *	function checks whether overflow should be drained and ignored
+ *	for @request.
+ *
+ *	LOCKING:
+ *	None.
+ *
+ *	RETURNS:
+ *	1 if ; otherwise, 0.
+ */
+static int atapi_drain_needed(struct request *rq)
+{
+	if (likely(!blk_rq_is_passthrough(rq)))
+		return 0;
+
+	if (!blk_rq_bytes(rq) || op_is_write(req_op(rq)))
+		return 0;
+
+	return atapi_cmd_type(scsi_req(rq)->cmd[0]) == ATAPI_MISC;
+}
+
+static int ata_scsi_dev_config(struct scsi_device *sdev,
+			       struct ata_device *dev)
+{
+	struct request_queue *q = sdev->request_queue;
+
+	if (!ata_id_has_unload(dev->id))
+		dev->flags |= ATA_DFLAG_NO_UNLOAD;
+
+	/* configure max sectors */
+	blk_queue_max_hw_sectors(q, dev->max_sectors);
+
+	if (dev->class == ATA_DEV_ATAPI) {
+		void *buf;
+
+		sdev->sector_size = ATA_SECT_SIZE;
+
+		/* set DMA padding */
+		blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
+
+		/* configure draining */
+		buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
+		if (!buf) {
+			ata_dev_err(dev, "drain buffer allocation failed\n");
+			return -ENOMEM;
+		}
+
+		blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
+	} else {
+		sdev->sector_size = ata_id_logical_sector_size(dev->id);
+		sdev->manage_start_stop = 1;
+	}
+
+	/*
+	 * ata_pio_sectors() expects buffer for each sector to not cross
+	 * page boundary.  Enforce it by requiring buffers to be sector
+	 * aligned, which works iff sector_size is not larger than
+	 * PAGE_SIZE.  ATAPI devices also need the alignment as
+	 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
+	 */
+	if (sdev->sector_size > PAGE_SIZE)
+		ata_dev_warn(dev,
+			"sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
+			sdev->sector_size);
+
+	blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
+
+	if (dev->flags & ATA_DFLAG_AN)
+		set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
+
+	if (dev->flags & ATA_DFLAG_NCQ) {
+		int depth;
+
+		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+		depth = min(ATA_MAX_QUEUE, depth);
+		scsi_change_queue_depth(sdev, depth);
+	}
+
+	blk_queue_flush_queueable(q, false);
+
+	if (dev->flags & ATA_DFLAG_TRUSTED)
+		sdev->security_supported = 1;
+
+	dev->sdev = sdev;
+	return 0;
+}
+
+/**
+ *	ata_scsi_slave_config - Set SCSI device attributes
+ *	@sdev: SCSI device to examine
+ *
+ *	This is called before we actually start reading
+ *	and writing to the device, to configure certain
+ *	SCSI mid-layer behaviors.
+ *
+ *	LOCKING:
+ *	Defined by SCSI layer.  We don't really care.
+ */
+
+int ata_scsi_slave_config(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
+	int rc = 0;
+
+	ata_scsi_sdev_config(sdev);
+
+	if (dev)
+		rc = ata_scsi_dev_config(sdev, dev);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
+ *	@sdev: SCSI device to be destroyed
+ *
+ *	@sdev is about to be destroyed for hot/warm unplugging.  If
+ *	this unplugging was initiated by libata as indicated by NULL
+ *	dev->sdev, this function doesn't have to do anything.
+ *	Otherwise, SCSI layer initiated warm-unplug is in progress.
+ *	Clear dev->sdev, schedule the device for ATA detach and invoke
+ *	EH.
+ *
+ *	LOCKING:
+ *	Defined by SCSI layer.  We don't really care.
+ */
+void ata_scsi_slave_destroy(struct scsi_device *sdev)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+	struct request_queue *q = sdev->request_queue;
+	unsigned long flags;
+	struct ata_device *dev;
+
+	if (!ap->ops->error_handler)
+		return;
+
+	spin_lock_irqsave(ap->lock, flags);
+	dev = __ata_scsi_find_dev(ap, sdev);
+	if (dev && dev->sdev) {
+		/* SCSI device already in CANCEL state, no need to offline it */
+		dev->sdev = NULL;
+		dev->flags |= ATA_DFLAG_DETACH;
+		ata_port_schedule_eh(ap);
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	kfree(q->dma_drain_buffer);
+	q->dma_drain_buffer = NULL;
+	q->dma_drain_size = 0;
+}
+
+/**
+ *	__ata_change_queue_depth - helper for ata_scsi_change_queue_depth
+ *	@ap: ATA port to which the device change the queue depth
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	libsas and libata have different approaches for associating a sdev to
+ *	its ata_port.
+ *
+ */
+int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
+			     int queue_depth)
+{
+	struct ata_device *dev;
+	unsigned long flags;
+
+	if (queue_depth < 1 || queue_depth == sdev->queue_depth)
+		return sdev->queue_depth;
+
+	dev = ata_scsi_find_dev(ap, sdev);
+	if (!dev || !ata_dev_enabled(dev))
+		return sdev->queue_depth;
+
+	/* NCQ enabled? */
+	spin_lock_irqsave(ap->lock, flags);
+	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
+	if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
+		dev->flags |= ATA_DFLAG_NCQ_OFF;
+		queue_depth = 1;
+	}
+	spin_unlock_irqrestore(ap->lock, flags);
+
+	/* limit and apply queue depth */
+	queue_depth = min(queue_depth, sdev->host->can_queue);
+	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
+	queue_depth = min(queue_depth, ATA_MAX_QUEUE);
+
+	if (sdev->queue_depth == queue_depth)
+		return -EINVAL;
+
+	return scsi_change_queue_depth(sdev, queue_depth);
+}
+
+/**
+ *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ *	@sdev: SCSI device to configure queue depth for
+ *	@queue_depth: new queue depth
+ *
+ *	This is libata standard hostt->change_queue_depth callback.
+ *	SCSI will call into this callback when user tries to set queue
+ *	depth via sysfs.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Newly configured queue depth.
+ */
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+	struct ata_port *ap = ata_shost_to_port(sdev->host);
+
+	return __ata_change_queue_depth(ap, sdev, queue_depth);
+}
+
+/**
+ *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
+ *	@qc: Storage for translated ATA taskfile
+ *
+ *	Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
+ *	(to start). Perhaps these commands should be preceded by
+ *	CHECK POWER MODE to see what power mode the device is already in.
+ *	[See SAT revision 5 at www.t10.org]
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->tf;
+	const u8 *cdb = scmd->cmnd;
+	u16 fp;
+	u8 bp = 0xff;
+
+	if (scmd->cmd_len < 5) {
+		fp = 4;
+		goto invalid_fld;
+	}
+
+	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+	tf->protocol = ATA_PROT_NODATA;
+	if (cdb[1] & 0x1) {
+		;	/* ignore IMMED bit, violates sat-r05 */
+	}
+	if (cdb[4] & 0x2) {
+		fp = 4;
+		bp = 1;
+		goto invalid_fld;       /* LOEJ bit set not supported */
+	}
+	if (((cdb[4] >> 4) & 0xf) != 0) {
+		fp = 4;
+		bp = 3;
+		goto invalid_fld;       /* power conditions not supported */
+	}
+
+	if (cdb[4] & 0x1) {
+		tf->nsect = 1;	/* 1 sector, lba=0 */
+
+		if (qc->dev->flags & ATA_DFLAG_LBA) {
+			tf->flags |= ATA_TFLAG_LBA;
+
+			tf->lbah = 0x0;
+			tf->lbam = 0x0;
+			tf->lbal = 0x0;
+			tf->device |= ATA_LBA;
+		} else {
+			/* CHS */
+			tf->lbal = 0x1; /* sect */
+			tf->lbam = 0x0; /* cyl low */
+			tf->lbah = 0x0; /* cyl high */
+		}
+
+		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
+	} else {
+		/* Some odd clown BIOSen issue spindown on power off (ACPI S4
+		 * or S5) causing some drives to spin up and down again.
+		 */
+		if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
+		    system_state == SYSTEM_POWER_OFF)
+			goto skip;
+
+		if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
+		     system_entering_hibernation())
+			goto skip;
+
+		/* Issue ATA STANDBY IMMEDIATE command */
+		tf->command = ATA_CMD_STANDBYNOW1;
+	}
+
+	/*
+	 * Standby and Idle condition timers could be implemented but that
+	 * would require libata to implement the Power condition mode page
+	 * and allow the user to change it. Changing mode pages requires
+	 * MODE SELECT to be implemented.
+	 */
+
+	return 0;
+
+ invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
+	return 1;
+ skip:
+	scmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+
+/**
+ *	ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
+ *	@qc: Storage for translated ATA taskfile
+ *
+ *	Sets up an ATA taskfile to issue FLUSH CACHE or
+ *	FLUSH CACHE EXT.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &qc->tf;
+
+	tf->flags |= ATA_TFLAG_DEVICE;
+	tf->protocol = ATA_PROT_NODATA;
+
+	if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
+		tf->command = ATA_CMD_FLUSH_EXT;
+	else
+		tf->command = ATA_CMD_FLUSH;
+
+	/* flush is critical for IO integrity, consider it an IO command */
+	qc->flags |= ATA_QCFLAG_IO;
+
+	return 0;
+}
+
+/**
+ *	scsi_6_lba_len - Get LBA and transfer length
+ *	@cdb: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 6-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len;
+
+	VPRINTK("six-byte command\n");
+
+	lba |= ((u64)(cdb[1] & 0x1f)) << 16;
+	lba |= ((u64)cdb[2]) << 8;
+	lba |= ((u64)cdb[3]);
+
+	len = cdb[4];
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	scsi_10_lba_len - Get LBA and transfer length
+ *	@cdb: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 10-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len = 0;
+
+	VPRINTK("ten-byte command\n");
+
+	lba |= ((u64)cdb[2]) << 24;
+	lba |= ((u64)cdb[3]) << 16;
+	lba |= ((u64)cdb[4]) << 8;
+	lba |= ((u64)cdb[5]);
+
+	len |= ((u32)cdb[7]) << 8;
+	len |= ((u32)cdb[8]);
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	scsi_16_lba_len - Get LBA and transfer length
+ *	@cdb: SCSI command to translate
+ *
+ *	Calculate LBA and transfer length for 16-byte commands.
+ *
+ *	RETURNS:
+ *	@plba: the LBA
+ *	@plen: the transfer length
+ */
+static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
+{
+	u64 lba = 0;
+	u32 len = 0;
+
+	VPRINTK("sixteen-byte command\n");
+
+	lba |= ((u64)cdb[2]) << 56;
+	lba |= ((u64)cdb[3]) << 48;
+	lba |= ((u64)cdb[4]) << 40;
+	lba |= ((u64)cdb[5]) << 32;
+	lba |= ((u64)cdb[6]) << 24;
+	lba |= ((u64)cdb[7]) << 16;
+	lba |= ((u64)cdb[8]) << 8;
+	lba |= ((u64)cdb[9]);
+
+	len |= ((u32)cdb[10]) << 24;
+	len |= ((u32)cdb[11]) << 16;
+	len |= ((u32)cdb[12]) << 8;
+	len |= ((u32)cdb[13]);
+
+	*plba = lba;
+	*plen = len;
+}
+
+/**
+ *	ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
+ *	@qc: Storage for translated ATA taskfile
+ *
+ *	Converts SCSI VERIFY command to an ATA READ VERIFY command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct ata_taskfile *tf = &qc->tf;
+	struct ata_device *dev = qc->dev;
+	u64 dev_sectors = qc->dev->n_sectors;
+	const u8 *cdb = scmd->cmnd;
+	u64 block;
+	u32 n_block;
+	u16 fp;
+
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	tf->protocol = ATA_PROT_NODATA;
+
+	if (cdb[0] == VERIFY) {
+		if (scmd->cmd_len < 10) {
+			fp = 9;
+			goto invalid_fld;
+		}
+		scsi_10_lba_len(cdb, &block, &n_block);
+	} else if (cdb[0] == VERIFY_16) {
+		if (scmd->cmd_len < 16) {
+			fp = 15;
+			goto invalid_fld;
+		}
+		scsi_16_lba_len(cdb, &block, &n_block);
+	} else {
+		fp = 0;
+		goto invalid_fld;
+	}
+
+	if (!n_block)
+		goto nothing_to_do;
+	if (block >= dev_sectors)
+		goto out_of_range;
+	if ((block + n_block) > dev_sectors)
+		goto out_of_range;
+
+	if (dev->flags & ATA_DFLAG_LBA) {
+		tf->flags |= ATA_TFLAG_LBA;
+
+		if (lba_28_ok(block, n_block)) {
+			/* use LBA28 */
+			tf->command = ATA_CMD_VERIFY;
+			tf->device |= (block >> 24) & 0xf;
+		} else if (lba_48_ok(block, n_block)) {
+			if (!(dev->flags & ATA_DFLAG_LBA48))
+				goto out_of_range;
+
+			/* use LBA48 */
+			tf->flags |= ATA_TFLAG_LBA48;
+			tf->command = ATA_CMD_VERIFY_EXT;
+
+			tf->hob_nsect = (n_block >> 8) & 0xff;
+
+			tf->hob_lbah = (block >> 40) & 0xff;
+			tf->hob_lbam = (block >> 32) & 0xff;
+			tf->hob_lbal = (block >> 24) & 0xff;
+		} else
+			/* request too large even for LBA48 */
+			goto out_of_range;
+
+		tf->nsect = n_block & 0xff;
+
+		tf->lbah = (block >> 16) & 0xff;
+		tf->lbam = (block >> 8) & 0xff;
+		tf->lbal = block & 0xff;
+
+		tf->device |= ATA_LBA;
+	} else {
+		/* CHS */
+		u32 sect, head, cyl, track;
+
+		if (!lba_28_ok(block, n_block))
+			goto out_of_range;
+
+		/* Convert LBA to CHS */
+		track = (u32)block / dev->sectors;
+		cyl   = track / dev->heads;
+		head  = track % dev->heads;
+		sect  = (u32)block % dev->sectors + 1;
+
+		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
+			(u32)block, track, cyl, head, sect);
+
+		/* Check whether the converted CHS can fit.
+		   Cylinder: 0-65535
+		   Head: 0-15
+		   Sector: 1-255*/
+		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+			goto out_of_range;
+
+		tf->command = ATA_CMD_VERIFY;
+		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+		tf->lbal = sect;
+		tf->lbam = cyl;
+		tf->lbah = cyl >> 8;
+		tf->device |= head;
+	}
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
+	return 1;
+
+out_of_range:
+	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
+	/* "Logical Block Address out of range" */
+	return 1;
+
+nothing_to_do:
+	scmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks)
+{
+	struct request *rq = scmd->request;
+	u32 req_blocks;
+
+	if (!blk_rq_is_passthrough(rq))
+		return true;
+
+	req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size;
+	if (n_blocks > req_blocks)
+		return false;
+
+	return true;
+}
+
+/**
+ *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
+ *	@qc: Storage for translated ATA taskfile
+ *
+ *	Converts any of six SCSI read/write commands into the
+ *	ATA counterpart, including starting sector (LBA),
+ *	sector count, and taking into account the device's LBA48
+ *	support.
+ *
+ *	Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
+ *	%WRITE_16 are currently supported.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	const u8 *cdb = scmd->cmnd;
+	struct request *rq = scmd->request;
+	int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
+	unsigned int tf_flags = 0;
+	u64 block;
+	u32 n_block;
+	int rc;
+	u16 fp = 0;
+
+	if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
+		tf_flags |= ATA_TFLAG_WRITE;
+
+	/* Calculate the SCSI LBA, transfer length and FUA. */
+	switch (cdb[0]) {
+	case READ_10:
+	case WRITE_10:
+		if (unlikely(scmd->cmd_len < 10)) {
+			fp = 9;
+			goto invalid_fld;
+		}
+		scsi_10_lba_len(cdb, &block, &n_block);
+		if (cdb[1] & (1 << 3))
+			tf_flags |= ATA_TFLAG_FUA;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
+		break;
+	case READ_6:
+	case WRITE_6:
+		if (unlikely(scmd->cmd_len < 6)) {
+			fp = 5;
+			goto invalid_fld;
+		}
+		scsi_6_lba_len(cdb, &block, &n_block);
+
+		/* for 6-byte r/w commands, transfer length 0
+		 * means 256 blocks of data, not 0 block.
+		 */
+		if (!n_block)
+			n_block = 256;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
+		break;
+	case READ_16:
+	case WRITE_16:
+		if (unlikely(scmd->cmd_len < 16)) {
+			fp = 15;
+			goto invalid_fld;
+		}
+		scsi_16_lba_len(cdb, &block, &n_block);
+		if (cdb[1] & (1 << 3))
+			tf_flags |= ATA_TFLAG_FUA;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
+		break;
+	default:
+		DPRINTK("no-byte command\n");
+		fp = 0;
+		goto invalid_fld;
+	}
+
+	/* Check and compose ATA command */
+	if (!n_block)
+		/* For 10-byte and 16-byte SCSI R/W commands, transfer
+		 * length 0 means transfer 0 block of data.
+		 * However, for ATA R/W commands, sector count 0 means
+		 * 256 or 65536 sectors, not 0 sectors as in SCSI.
+		 *
+		 * WARNING: one or two older ATA drives treat 0 as 0...
+		 */
+		goto nothing_to_do;
+
+	qc->flags |= ATA_QCFLAG_IO;
+	qc->nbytes = n_block * scmd->device->sector_size;
+
+	rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
+			     qc->hw_tag, class);
+
+	if (likely(rc == 0))
+		return 0;
+
+	if (rc == -ERANGE)
+		goto out_of_range;
+	/* treat all other errors as -EINVAL, fall through */
+invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
+	return 1;
+
+out_of_range:
+	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
+	/* "Logical Block Address out of range" */
+	return 1;
+
+nothing_to_do:
+	scmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+static void ata_qc_done(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	void (*done)(struct scsi_cmnd *) = qc->scsidone;
+
+	ata_qc_free(qc);
+	done(cmd);
+}
+
+static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	u8 *cdb = cmd->cmnd;
+	int need_sense = (qc->err_mask != 0);
+
+	/* For ATA pass thru (SAT) commands, generate a sense block if
+	 * user mandated it or if there's an error.  Note that if we
+	 * generate because the user forced us to [CK_COND =1], a check
+	 * condition is generated and the ATA register values are returned
+	 * whether the command completed successfully or not. If there
+	 * was no error, we use the following sense data:
+	 * sk = RECOVERED ERROR
+	 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
+	 */
+	if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
+	    ((cdb[2] & 0x20) || need_sense))
+		ata_gen_passthru_sense(qc);
+	else if (qc->flags & ATA_QCFLAG_SENSE_VALID)
+		cmd->result = SAM_STAT_CHECK_CONDITION;
+	else if (need_sense)
+		ata_gen_ata_sense(qc);
+	else
+		cmd->result = SAM_STAT_GOOD;
+
+	if (need_sense && !ap->ops->error_handler)
+		ata_dump_status(ap->print_id, &qc->result_tf);
+
+	ata_qc_done(qc);
+}
+
+/**
+ *	ata_scsi_translate - Translate then issue SCSI command to ATA device
+ *	@dev: ATA device to which the command is addressed
+ *	@cmd: SCSI command to execute
+ *	@xlat_func: Actor which translates @cmd to an ATA taskfile
+ *
+ *	Our ->queuecommand() function has decided that the SCSI
+ *	command issued can be directly translated into an ATA
+ *	command, rather than handled internally.
+ *
+ *	This function sets up an ata_queued_cmd structure for the
+ *	SCSI command, and sends that ata_queued_cmd to the hardware.
+ *
+ *	The xlat_func argument (actor) returns 0 if ready to execute
+ *	ATA command, else 1 to finish translation. If 1 is returned
+ *	then cmd->result (and possibly cmd->sense_buffer) are assumed
+ *	to be set reflecting an error condition or clean (early)
+ *	termination.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
+ *	needs to be deferred.
+ */
+static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
+			      ata_xlat_func_t xlat_func)
+{
+	struct ata_port *ap = dev->link->ap;
+	struct ata_queued_cmd *qc;
+	int rc;
+
+	VPRINTK("ENTER\n");
+
+	qc = ata_scsi_qc_new(dev, cmd);
+	if (!qc)
+		goto err_mem;
+
+	/* data is present; dma-map it */
+	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
+	    cmd->sc_data_direction == DMA_TO_DEVICE) {
+		if (unlikely(scsi_bufflen(cmd) < 1)) {
+			ata_dev_warn(dev, "WARNING: zero len r/w req\n");
+			goto err_did;
+		}
+
+		ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
+
+		qc->dma_dir = cmd->sc_data_direction;
+	}
+
+	qc->complete_fn = ata_scsi_qc_complete;
+
+	if (xlat_func(qc))
+		goto early_finish;
+
+	if (ap->ops->qc_defer) {
+		if ((rc = ap->ops->qc_defer(qc)))
+			goto defer;
+	}
+
+	/* select device, send command to hardware */
+	ata_qc_issue(qc);
+
+	VPRINTK("EXIT\n");
+	return 0;
+
+early_finish:
+	ata_qc_free(qc);
+	cmd->scsi_done(cmd);
+	DPRINTK("EXIT - early finish (good or error)\n");
+	return 0;
+
+err_did:
+	ata_qc_free(qc);
+	cmd->result = (DID_ERROR << 16);
+	cmd->scsi_done(cmd);
+err_mem:
+	DPRINTK("EXIT - internal\n");
+	return 0;
+
+defer:
+	ata_qc_free(qc);
+	DPRINTK("EXIT - defer\n");
+	if (rc == ATA_DEFER_LINK)
+		return SCSI_MLQUEUE_DEVICE_BUSY;
+	else
+		return SCSI_MLQUEUE_HOST_BUSY;
+}
+
+struct ata_scsi_args {
+	struct ata_device	*dev;
+	u16			*id;
+	struct scsi_cmnd	*cmd;
+};
+
+/**
+ *	ata_scsi_rbuf_get - Map response buffer.
+ *	@cmd: SCSI command containing buffer to be mapped.
+ *	@flags: unsigned long variable to store irq enable status
+ *	@copy_in: copy in from user buffer
+ *
+ *	Prepare buffer for simulated SCSI commands.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(ata_scsi_rbuf_lock) on success
+ *
+ *	RETURNS:
+ *	Pointer to response buffer.
+ */
+static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
+			       unsigned long *flags)
+{
+	spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
+
+	memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
+	if (copy_in)
+		sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
+				  ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
+	return ata_scsi_rbuf;
+}
+
+/**
+ *	ata_scsi_rbuf_put - Unmap response buffer.
+ *	@cmd: SCSI command containing buffer to be unmapped.
+ *	@copy_out: copy out result
+ *	@flags: @flags passed to ata_scsi_rbuf_get()
+ *
+ *	Returns rbuf buffer.  The result is copied to @cmd's buffer if
+ *	@copy_back is true.
+ *
+ *	LOCKING:
+ *	Unlocks ata_scsi_rbuf_lock.
+ */
+static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
+				     unsigned long *flags)
+{
+	if (copy_out)
+		sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
+				    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
+	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
+}
+
+/**
+ *	ata_scsi_rbuf_fill - wrapper for SCSI command simulators
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@actor: Callback hook for desired SCSI command simulator
+ *
+ *	Takes care of the hard work of simulating a SCSI command...
+ *	Mapping the response buffer, calling the command's handler,
+ *	and handling the handler's return value.  This return value
+ *	indicates whether the handler wishes the SCSI command to be
+ *	completed successfully (0), or not (in which case cmd->result
+ *	and sense buffer are assumed to be set).
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
+		unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
+{
+	u8 *rbuf;
+	unsigned int rc;
+	struct scsi_cmnd *cmd = args->cmd;
+	unsigned long flags;
+
+	rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
+	rc = actor(args, rbuf);
+	ata_scsi_rbuf_put(cmd, rc == 0, &flags);
+
+	if (rc == 0)
+		cmd->result = SAM_STAT_GOOD;
+}
+
+/**
+ *	ata_scsiop_inq_std - Simulate INQUIRY command
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Returns standard device identification data associated
+ *	with non-VPD INQUIRY command output.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
+{
+	static const u8 versions[] = {
+		0x00,
+		0x60,	/* SAM-3 (no version claimed) */
+
+		0x03,
+		0x20,	/* SBC-2 (no version claimed) */
+
+		0x03,
+		0x00	/* SPC-3 (no version claimed) */
+	};
+	static const u8 versions_zbc[] = {
+		0x00,
+		0xA0,	/* SAM-5 (no version claimed) */
+
+		0x06,
+		0x00,	/* SBC-4 (no version claimed) */
+
+		0x05,
+		0xC0,	/* SPC-5 (no version claimed) */
+
+		0x60,
+		0x24,   /* ZBC r05 */
+	};
+
+	u8 hdr[] = {
+		TYPE_DISK,
+		0,
+		0x5,	/* claim SPC-3 version compatibility */
+		2,
+		95 - 4,
+		0,
+		0,
+		2
+	};
+
+	VPRINTK("ENTER\n");
+
+	/* set scsi removable (RMB) bit per ata bit, or if the
+	 * AHCI port says it's external (Hotplug-capable, eSATA).
+	 */
+	if (ata_id_removable(args->id) ||
+	    (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
+		hdr[1] |= (1 << 7);
+
+	if (args->dev->class == ATA_DEV_ZAC) {
+		hdr[0] = TYPE_ZBC;
+		hdr[2] = 0x7; /* claim SPC-5 version compatibility */
+	}
+
+	memcpy(rbuf, hdr, sizeof(hdr));
+	memcpy(&rbuf[8], "ATA     ", 8);
+	ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
+
+	/* From SAT, use last 2 words from fw rev unless they are spaces */
+	ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
+	if (strncmp(&rbuf[32], "    ", 4) == 0)
+		ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
+
+	if (rbuf[32] == 0 || rbuf[32] == ' ')
+		memcpy(&rbuf[32], "n/a ", 4);
+
+	if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC)
+		memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
+	else
+		memcpy(rbuf + 58, versions, sizeof(versions));
+
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Returns list of inquiry VPD pages available.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
+{
+	int num_pages;
+	static const u8 pages[] = {
+		0x00,	/* page 0x00, this page */
+		0x80,	/* page 0x80, unit serial no page */
+		0x83,	/* page 0x83, device ident page */
+		0x89,	/* page 0x89, ata info page */
+		0xb0,	/* page 0xb0, block limits page */
+		0xb1,	/* page 0xb1, block device characteristics page */
+		0xb2,	/* page 0xb2, thin provisioning page */
+		0xb6,	/* page 0xb6, zoned block device characteristics */
+	};
+
+	num_pages = sizeof(pages);
+	if (!(args->dev->flags & ATA_DFLAG_ZAC))
+		num_pages--;
+	rbuf[3] = num_pages;	/* number of supported VPD pages */
+	memcpy(rbuf + 4, pages, num_pages);
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Returns ATA device serial number.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
+{
+	static const u8 hdr[] = {
+		0,
+		0x80,			/* this page code */
+		0,
+		ATA_ID_SERNO_LEN,	/* page len */
+	};
+
+	memcpy(rbuf, hdr, sizeof(hdr));
+	ata_id_string(args->id, (unsigned char *) &rbuf[4],
+		      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Yields two logical unit device identification designators:
+ *	 - vendor specific ASCII containing the ATA serial number
+ *	 - SAT defined "t10 vendor id based" containing ASCII vendor
+ *	   name ("ATA     "), model and serial numbers.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
+{
+	const int sat_model_serial_desc_len = 68;
+	int num;
+
+	rbuf[1] = 0x83;			/* this page code */
+	num = 4;
+
+	/* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
+	rbuf[num + 0] = 2;
+	rbuf[num + 3] = ATA_ID_SERNO_LEN;
+	num += 4;
+	ata_id_string(args->id, (unsigned char *) rbuf + num,
+		      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
+	num += ATA_ID_SERNO_LEN;
+
+	/* SAT defined lu model and serial numbers descriptor */
+	/* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
+	rbuf[num + 0] = 2;
+	rbuf[num + 1] = 1;
+	rbuf[num + 3] = sat_model_serial_desc_len;
+	num += 4;
+	memcpy(rbuf + num, "ATA     ", 8);
+	num += 8;
+	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
+		      ATA_ID_PROD_LEN);
+	num += ATA_ID_PROD_LEN;
+	ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
+		      ATA_ID_SERNO_LEN);
+	num += ATA_ID_SERNO_LEN;
+
+	if (ata_id_has_wwn(args->id)) {
+		/* SAT defined lu world wide name */
+		/* piv=0, assoc=lu, code_set=binary, designator=NAA */
+		rbuf[num + 0] = 1;
+		rbuf[num + 1] = 3;
+		rbuf[num + 3] = ATA_ID_WWN_LEN;
+		num += 4;
+		ata_id_string(args->id, (unsigned char *) rbuf + num,
+			      ATA_ID_WWN, ATA_ID_WWN_LEN);
+		num += ATA_ID_WWN_LEN;
+	}
+	rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
+	return 0;
+}
+
+/**
+ *	ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Yields SAT-specified ATA VPD page.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
+{
+	struct ata_taskfile tf;
+
+	memset(&tf, 0, sizeof(tf));
+
+	rbuf[1] = 0x89;			/* our page code */
+	rbuf[2] = (0x238 >> 8);		/* page size fixed at 238h */
+	rbuf[3] = (0x238 & 0xff);
+
+	memcpy(&rbuf[8], "linux   ", 8);
+	memcpy(&rbuf[16], "libata          ", 16);
+	memcpy(&rbuf[32], DRV_VERSION, 4);
+
+	/* we don't store the ATA device signature, so we fake it */
+
+	tf.command = ATA_DRDY;		/* really, this is Status reg */
+	tf.lbal = 0x1;
+	tf.nsect = 0x1;
+
+	ata_tf_to_fis(&tf, 0, 1, &rbuf[36]);	/* TODO: PMP? */
+	rbuf[36] = 0x34;		/* force D2H Reg FIS (34h) */
+
+	rbuf[56] = ATA_CMD_ID_ATA;
+
+	memcpy(&rbuf[60], &args->id[0], 512);
+	return 0;
+}
+
+static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
+{
+	struct ata_device *dev = args->dev;
+	u16 min_io_sectors;
+
+	rbuf[1] = 0xb0;
+	rbuf[3] = 0x3c;		/* required VPD size with unmap support */
+
+	/*
+	 * Optimal transfer length granularity.
+	 *
+	 * This is always one physical block, but for disks with a smaller
+	 * logical than physical sector size we need to figure out what the
+	 * latter is.
+	 */
+	min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
+	put_unaligned_be16(min_io_sectors, &rbuf[6]);
+
+	/*
+	 * Optimal unmap granularity.
+	 *
+	 * The ATA spec doesn't even know about a granularity or alignment
+	 * for the TRIM command.  We can leave away most of the unmap related
+	 * VPD page entries, but we have specifify a granularity to signal
+	 * that we support some form of unmap - in thise case via WRITE SAME
+	 * with the unmap bit set.
+	 */
+	if (ata_id_has_trim(args->id)) {
+		u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM;
+
+		if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M)
+			max_blocks = 128 << (20 - SECTOR_SHIFT);
+
+		put_unaligned_be64(max_blocks, &rbuf[36]);
+		put_unaligned_be32(1, &rbuf[28]);
+	}
+
+	return 0;
+}
+
+static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
+{
+	int form_factor = ata_id_form_factor(args->id);
+	int media_rotation_rate = ata_id_rotation_rate(args->id);
+	u8 zoned = ata_id_zoned_cap(args->id);
+
+	rbuf[1] = 0xb1;
+	rbuf[3] = 0x3c;
+	rbuf[4] = media_rotation_rate >> 8;
+	rbuf[5] = media_rotation_rate;
+	rbuf[7] = form_factor;
+	if (zoned)
+		rbuf[8] = (zoned << 4);
+
+	return 0;
+}
+
+static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
+{
+	/* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
+	rbuf[1] = 0xb2;
+	rbuf[3] = 0x4;
+	rbuf[5] = 1 << 6;	/* TPWS */
+
+	return 0;
+}
+
+static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf)
+{
+	/*
+	 * zbc-r05 SCSI Zoned Block device characteristics VPD page
+	 */
+	rbuf[1] = 0xb6;
+	rbuf[3] = 0x3C;
+
+	/*
+	 * URSWRZ bit is only meaningful for host-managed ZAC drives
+	 */
+	if (args->dev->zac_zoned_cap & 1)
+		rbuf[4] |= 1;
+	put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]);
+	put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]);
+	put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]);
+
+	return 0;
+}
+
+/**
+ *	modecpy - Prepare response for MODE SENSE
+ *	@dest: output buffer
+ *	@src: data being copied
+ *	@n: length of mode page
+ *	@changeable: whether changeable parameters are requested
+ *
+ *	Generate a generic MODE SENSE page for either current or changeable
+ *	parameters.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
+{
+	if (changeable) {
+		memcpy(dest, src, 2);
+		memset(dest + 2, 0, n - 2);
+	} else {
+		memcpy(dest, src, n);
+	}
+}
+
+/**
+ *	ata_msense_caching - Simulate MODE SENSE caching info page
+ *	@id: device IDENTIFY data
+ *	@buf: output buffer
+ *	@changeable: whether changeable parameters are requested
+ *
+ *	Generate a caching info page, which conditionally indicates
+ *	write caching to the SCSI layer, depending on device
+ *	capabilities.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
+{
+	modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
+	if (changeable) {
+		buf[2] |= (1 << 2);	/* ata_mselect_caching() */
+	} else {
+		buf[2] |= (ata_id_wcache_enabled(id) << 2);	/* write cache enable */
+		buf[12] |= (!ata_id_rahead_enabled(id) << 5);	/* disable read ahead */
+	}
+	return sizeof(def_cache_mpage);
+}
+
+/**
+ *	ata_msense_control - Simulate MODE SENSE control mode page
+ *	@dev: ATA device of interest
+ *	@buf: output buffer
+ *	@changeable: whether changeable parameters are requested
+ *
+ *	Generate a generic MODE SENSE control mode page.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf,
+					bool changeable)
+{
+	modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
+	if (changeable) {
+		buf[2] |= (1 << 2);	/* ata_mselect_control() */
+	} else {
+		bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
+
+		buf[2] |= (d_sense << 2);	/* descriptor format sense data */
+	}
+	return sizeof(def_control_mpage);
+}
+
+/**
+ *	ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
+ *	@buf: output buffer
+ *	@changeable: whether changeable parameters are requested
+ *
+ *	Generate a generic MODE SENSE r/w error recovery page.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
+{
+	modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
+		changeable);
+	return sizeof(def_rw_recovery_mpage);
+}
+
+/*
+ * We can turn this into a real blacklist if it's needed, for now just
+ * blacklist any Maxtor BANC1G10 revision firmware
+ */
+static int ata_dev_supports_fua(u16 *id)
+{
+	unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
+
+	if (!libata_fua)
+		return 0;
+	if (!ata_id_has_fua(id))
+		return 0;
+
+	ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
+	ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
+
+	if (strcmp(model, "Maxtor"))
+		return 1;
+	if (strcmp(fw, "BANC1G10"))
+		return 1;
+
+	return 0; /* blacklisted */
+}
+
+/**
+ *	ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Simulate MODE SENSE commands. Assume this is invoked for direct
+ *	access devices (e.g. disks) only. There should be no block
+ *	descriptor for other device types.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
+{
+	struct ata_device *dev = args->dev;
+	u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
+	static const u8 sat_blk_desc[] = {
+		0, 0, 0, 0,	/* number of blocks: sat unspecified */
+		0,
+		0, 0x2, 0x0	/* block length: 512 bytes */
+	};
+	u8 pg, spg;
+	unsigned int ebd, page_control, six_byte;
+	u8 dpofua, bp = 0xff;
+	u16 fp;
+
+	VPRINTK("ENTER\n");
+
+	six_byte = (scsicmd[0] == MODE_SENSE);
+	ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
+	/*
+	 * LLBA bit in msense(10) ignored (compliant)
+	 */
+
+	page_control = scsicmd[2] >> 6;
+	switch (page_control) {
+	case 0: /* current */
+	case 1: /* changeable */
+	case 2: /* defaults */
+		break;  /* supported */
+	case 3: /* saved */
+		goto saving_not_supp;
+	default:
+		fp = 2;
+		bp = 6;
+		goto invalid_fld;
+	}
+
+	if (six_byte)
+		p += 4 + (ebd ? 8 : 0);
+	else
+		p += 8 + (ebd ? 8 : 0);
+
+	pg = scsicmd[2] & 0x3f;
+	spg = scsicmd[3];
+	/*
+	 * No mode subpages supported (yet) but asking for _all_
+	 * subpages may be valid
+	 */
+	if (spg && (spg != ALL_SUB_MPAGES)) {
+		fp = 3;
+		goto invalid_fld;
+	}
+
+	switch(pg) {
+	case RW_RECOVERY_MPAGE:
+		p += ata_msense_rw_recovery(p, page_control == 1);
+		break;
+
+	case CACHE_MPAGE:
+		p += ata_msense_caching(args->id, p, page_control == 1);
+		break;
+
+	case CONTROL_MPAGE:
+		p += ata_msense_control(args->dev, p, page_control == 1);
+		break;
+
+	case ALL_MPAGES:
+		p += ata_msense_rw_recovery(p, page_control == 1);
+		p += ata_msense_caching(args->id, p, page_control == 1);
+		p += ata_msense_control(args->dev, p, page_control == 1);
+		break;
+
+	default:		/* invalid page code */
+		fp = 2;
+		goto invalid_fld;
+	}
+
+	dpofua = 0;
+	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
+	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
+		dpofua = 1 << 4;
+
+	if (six_byte) {
+		rbuf[0] = p - rbuf - 1;
+		rbuf[2] |= dpofua;
+		if (ebd) {
+			rbuf[3] = sizeof(sat_blk_desc);
+			memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
+		}
+	} else {
+		unsigned int output_len = p - rbuf - 2;
+
+		rbuf[0] = output_len >> 8;
+		rbuf[1] = output_len;
+		rbuf[3] |= dpofua;
+		if (ebd) {
+			rbuf[7] = sizeof(sat_blk_desc);
+			memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
+		}
+	}
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_invalid_field(dev, args->cmd, fp, bp);
+	return 1;
+
+saving_not_supp:
+	ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
+	 /* "Saving parameters not supported" */
+	return 1;
+}
+
+/**
+ *	ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Simulate READ CAPACITY commands.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
+{
+	struct ata_device *dev = args->dev;
+	u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
+	u32 sector_size; /* physical sector size in bytes */
+	u8 log2_per_phys;
+	u16 lowest_aligned;
+
+	sector_size = ata_id_logical_sector_size(dev->id);
+	log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
+	lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
+
+	VPRINTK("ENTER\n");
+
+	if (args->cmd->cmnd[0] == READ_CAPACITY) {
+		if (last_lba >= 0xffffffffULL)
+			last_lba = 0xffffffff;
+
+		/* sector count, 32-bit */
+		rbuf[0] = last_lba >> (8 * 3);
+		rbuf[1] = last_lba >> (8 * 2);
+		rbuf[2] = last_lba >> (8 * 1);
+		rbuf[3] = last_lba;
+
+		/* sector size */
+		rbuf[4] = sector_size >> (8 * 3);
+		rbuf[5] = sector_size >> (8 * 2);
+		rbuf[6] = sector_size >> (8 * 1);
+		rbuf[7] = sector_size;
+	} else {
+		/* sector count, 64-bit */
+		rbuf[0] = last_lba >> (8 * 7);
+		rbuf[1] = last_lba >> (8 * 6);
+		rbuf[2] = last_lba >> (8 * 5);
+		rbuf[3] = last_lba >> (8 * 4);
+		rbuf[4] = last_lba >> (8 * 3);
+		rbuf[5] = last_lba >> (8 * 2);
+		rbuf[6] = last_lba >> (8 * 1);
+		rbuf[7] = last_lba;
+
+		/* sector size */
+		rbuf[ 8] = sector_size >> (8 * 3);
+		rbuf[ 9] = sector_size >> (8 * 2);
+		rbuf[10] = sector_size >> (8 * 1);
+		rbuf[11] = sector_size;
+
+		rbuf[12] = 0;
+		rbuf[13] = log2_per_phys;
+		rbuf[14] = (lowest_aligned >> 8) & 0x3f;
+		rbuf[15] = lowest_aligned;
+
+		if (ata_id_has_trim(args->id) &&
+		    !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
+			rbuf[14] |= 0x80; /* LBPME */
+
+			if (ata_id_has_zero_after_trim(args->id) &&
+			    dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
+				ata_dev_info(dev, "Enabling discard_zeroes_data\n");
+				rbuf[14] |= 0x40; /* LBPRZ */
+			}
+		}
+		if (ata_id_zoned_cap(args->id) ||
+		    args->dev->class == ATA_DEV_ZAC)
+			rbuf[12] = (1 << 4); /* RC_BASIS */
+	}
+	return 0;
+}
+
+/**
+ *	ata_scsiop_report_luns - Simulate REPORT LUNS command
+ *	@args: device IDENTIFY data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Simulate REPORT LUNS command.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
+{
+	VPRINTK("ENTER\n");
+	rbuf[3] = 8;	/* just one lun, LUN 0, size 8 bytes */
+
+	return 0;
+}
+
+static void atapi_sense_complete(struct ata_queued_cmd *qc)
+{
+	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
+		/* FIXME: not quite right; we don't want the
+		 * translation of taskfile registers into
+		 * a sense descriptors, since that's only
+		 * correct for ATA, not ATAPI
+		 */
+		ata_gen_passthru_sense(qc);
+	}
+
+	ata_qc_done(qc);
+}
+
+/* is it pointless to prefer PIO for "safety reasons"? */
+static inline int ata_pio_use_silly(struct ata_port *ap)
+{
+	return (ap->flags & ATA_FLAG_PIO_DMA);
+}
+
+static void atapi_request_sense(struct ata_queued_cmd *qc)
+{
+	struct ata_port *ap = qc->ap;
+	struct scsi_cmnd *cmd = qc->scsicmd;
+
+	DPRINTK("ATAPI request sense\n");
+
+	memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+
+#ifdef CONFIG_ATA_SFF
+	if (ap->ops->sff_tf_read)
+		ap->ops->sff_tf_read(ap, &qc->tf);
+#endif
+
+	/* fill these in, for the case where they are -not- overwritten */
+	cmd->sense_buffer[0] = 0x70;
+	cmd->sense_buffer[2] = qc->tf.feature >> 4;
+
+	ata_qc_reinit(qc);
+
+	/* setup sg table and init transfer direction */
+	sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
+	ata_sg_init(qc, &qc->sgent, 1);
+	qc->dma_dir = DMA_FROM_DEVICE;
+
+	memset(&qc->cdb, 0, qc->dev->cdb_len);
+	qc->cdb[0] = REQUEST_SENSE;
+	qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	qc->tf.command = ATA_CMD_PACKET;
+
+	if (ata_pio_use_silly(ap)) {
+		qc->tf.protocol = ATAPI_PROT_DMA;
+		qc->tf.feature |= ATAPI_PKT_DMA;
+	} else {
+		qc->tf.protocol = ATAPI_PROT_PIO;
+		qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
+		qc->tf.lbah = 0;
+	}
+	qc->nbytes = SCSI_SENSE_BUFFERSIZE;
+
+	qc->complete_fn = atapi_sense_complete;
+
+	ata_qc_issue(qc);
+
+	DPRINTK("EXIT\n");
+}
+
+/*
+ * ATAPI devices typically report zero for their SCSI version, and sometimes
+ * deviate from the spec WRT response data format.  If SCSI version is
+ * reported as zero like normal, then we make the following fixups:
+ *   1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a
+ *	modern device.
+ *   2) Ensure response data format / ATAPI information are always correct.
+ */
+static void atapi_fixup_inquiry(struct scsi_cmnd *cmd)
+{
+	u8 buf[4];
+
+	sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
+	if (buf[2] == 0) {
+		buf[2] = 0x5;
+		buf[3] = 0x32;
+	}
+	sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
+}
+
+static void atapi_qc_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *cmd = qc->scsicmd;
+	unsigned int err_mask = qc->err_mask;
+
+	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
+
+	/* handle completion from new EH */
+	if (unlikely(qc->ap->ops->error_handler &&
+		     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
+
+		if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
+			/* FIXME: not quite right; we don't want the
+			 * translation of taskfile registers into a
+			 * sense descriptors, since that's only
+			 * correct for ATA, not ATAPI
+			 */
+			ata_gen_passthru_sense(qc);
+		}
+
+		/* SCSI EH automatically locks door if sdev->locked is
+		 * set.  Sometimes door lock request continues to
+		 * fail, for example, when no media is present.  This
+		 * creates a loop - SCSI EH issues door lock which
+		 * fails and gets invoked again to acquire sense data
+		 * for the failed command.
+		 *
+		 * If door lock fails, always clear sdev->locked to
+		 * avoid this infinite loop.
+		 *
+		 * This may happen before SCSI scan is complete.  Make
+		 * sure qc->dev->sdev isn't NULL before dereferencing.
+		 */
+		if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
+			qc->dev->sdev->locked = 0;
+
+		qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
+		ata_qc_done(qc);
+		return;
+	}
+
+	/* successful completion or old EH failure path */
+	if (unlikely(err_mask & AC_ERR_DEV)) {
+		cmd->result = SAM_STAT_CHECK_CONDITION;
+		atapi_request_sense(qc);
+		return;
+	} else if (unlikely(err_mask)) {
+		/* FIXME: not quite right; we don't want the
+		 * translation of taskfile registers into
+		 * a sense descriptors, since that's only
+		 * correct for ATA, not ATAPI
+		 */
+		ata_gen_passthru_sense(qc);
+	} else {
+		if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0)
+			atapi_fixup_inquiry(cmd);
+		cmd->result = SAM_STAT_GOOD;
+	}
+
+	ata_qc_done(qc);
+}
+/**
+ *	atapi_xlat - Initialize PACKET taskfile
+ *	@qc: command structure to be initialized
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on failure.
+ */
+static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
+	int nodata = (scmd->sc_data_direction == DMA_NONE);
+	int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
+	unsigned int nbytes;
+
+	memset(qc->cdb, 0, dev->cdb_len);
+	memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
+
+	qc->complete_fn = atapi_qc_complete;
+
+	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
+		qc->tf.flags |= ATA_TFLAG_WRITE;
+		DPRINTK("direction: write\n");
+	}
+
+	qc->tf.command = ATA_CMD_PACKET;
+	ata_qc_set_pc_nbytes(qc);
+
+	/* check whether ATAPI DMA is safe */
+	if (!nodata && !using_pio && atapi_check_dma(qc))
+		using_pio = 1;
+
+	/* Some controller variants snoop this value for Packet
+	 * transfers to do state machine and FIFO management.  Thus we
+	 * want to set it properly, and for DMA where it is
+	 * effectively meaningless.
+	 */
+	nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
+
+	/* Most ATAPI devices which honor transfer chunk size don't
+	 * behave according to the spec when odd chunk size which
+	 * matches the transfer length is specified.  If the number of
+	 * bytes to transfer is 2n+1.  According to the spec, what
+	 * should happen is to indicate that 2n+1 is going to be
+	 * transferred and transfer 2n+2 bytes where the last byte is
+	 * padding.
+	 *
+	 * In practice, this doesn't happen.  ATAPI devices first
+	 * indicate and transfer 2n bytes and then indicate and
+	 * transfer 2 bytes where the last byte is padding.
+	 *
+	 * This inconsistency confuses several controllers which
+	 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
+	 * These controllers use actual number of transferred bytes to
+	 * update DMA poitner and transfer of 4n+2 bytes make those
+	 * controller push DMA pointer by 4n+4 bytes because SATA data
+	 * FISes are aligned to 4 bytes.  This causes data corruption
+	 * and buffer overrun.
+	 *
+	 * Always setting nbytes to even number solves this problem
+	 * because then ATAPI devices don't have to split data at 2n
+	 * boundaries.
+	 */
+	if (nbytes & 0x1)
+		nbytes++;
+
+	qc->tf.lbam = (nbytes & 0xFF);
+	qc->tf.lbah = (nbytes >> 8);
+
+	if (nodata)
+		qc->tf.protocol = ATAPI_PROT_NODATA;
+	else if (using_pio)
+		qc->tf.protocol = ATAPI_PROT_PIO;
+	else {
+		/* DMA data xfer */
+		qc->tf.protocol = ATAPI_PROT_DMA;
+		qc->tf.feature |= ATAPI_PKT_DMA;
+
+		if ((dev->flags & ATA_DFLAG_DMADIR) &&
+		    (scmd->sc_data_direction != DMA_TO_DEVICE))
+			/* some SATA bridges need us to indicate data xfer direction */
+			qc->tf.feature |= ATAPI_DMADIR;
+	}
+
+
+	/* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
+	   as ATAPI tape drives don't get this right otherwise */
+	return 0;
+}
+
+static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
+{
+	if (!sata_pmp_attached(ap)) {
+		if (likely(devno >= 0 &&
+			   devno < ata_link_max_devices(&ap->link)))
+			return &ap->link.device[devno];
+	} else {
+		if (likely(devno >= 0 &&
+			   devno < ap->nr_pmp_links))
+			return &ap->pmp_link[devno].device[0];
+	}
+
+	return NULL;
+}
+
+static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
+					      const struct scsi_device *scsidev)
+{
+	int devno;
+
+	/* skip commands not addressed to targets we simulate */
+	if (!sata_pmp_attached(ap)) {
+		if (unlikely(scsidev->channel || scsidev->lun))
+			return NULL;
+		devno = scsidev->id;
+	} else {
+		if (unlikely(scsidev->id || scsidev->lun))
+			return NULL;
+		devno = scsidev->channel;
+	}
+
+	return ata_find_dev(ap, devno);
+}
+
+/**
+ *	ata_scsi_find_dev - lookup ata_device from scsi_cmnd
+ *	@ap: ATA port to which the device is attached
+ *	@scsidev: SCSI device from which we derive the ATA device
+ *
+ *	Given various information provided in struct scsi_cmnd,
+ *	map that onto an ATA bus, and using that mapping
+ *	determine which ata_device is associated with the
+ *	SCSI command to be sent.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	Associated ATA device, or %NULL if not found.
+ */
+static struct ata_device *
+ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
+{
+	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
+
+	if (unlikely(!dev || !ata_dev_enabled(dev)))
+		return NULL;
+
+	return dev;
+}
+
+/*
+ *	ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
+ *	@byte1: Byte 1 from pass-thru CDB.
+ *
+ *	RETURNS:
+ *	ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
+ */
+static u8
+ata_scsi_map_proto(u8 byte1)
+{
+	switch((byte1 & 0x1e) >> 1) {
+	case 3:		/* Non-data */
+		return ATA_PROT_NODATA;
+
+	case 6:		/* DMA */
+	case 10:	/* UDMA Data-in */
+	case 11:	/* UDMA Data-Out */
+		return ATA_PROT_DMA;
+
+	case 4:		/* PIO Data-in */
+	case 5:		/* PIO Data-out */
+		return ATA_PROT_PIO;
+
+	case 12:	/* FPDMA */
+		return ATA_PROT_NCQ;
+
+	case 0:		/* Hard Reset */
+	case 1:		/* SRST */
+	case 8:		/* Device Diagnostic */
+	case 9:		/* Device Reset */
+	case 7:		/* DMA Queued */
+	case 15:	/* Return Response Info */
+	default:	/* Reserved */
+		break;
+	}
+
+	return ATA_PROT_UNKNOWN;
+}
+
+/**
+ *	ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
+ *	@qc: command structure to be initialized
+ *
+ *	Handles either 12, 16, or 32-byte versions of the CDB.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on failure.
+ */
+static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &(qc->tf);
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
+	const u8 *cdb = scmd->cmnd;
+	u16 fp;
+	u16 cdb_offset = 0;
+
+	/* 7Fh variable length cmd means a ata pass-thru(32) */
+	if (cdb[0] == VARIABLE_LENGTH_CMD)
+		cdb_offset = 9;
+
+	tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]);
+	if (tf->protocol == ATA_PROT_UNKNOWN) {
+		fp = 1;
+		goto invalid_fld;
+	}
+
+	if ((cdb[2 + cdb_offset] & 0x3) == 0) {
+		/*
+		 * When T_LENGTH is zero (No data is transferred), dir should
+		 * be DMA_NONE.
+		 */
+		if (scmd->sc_data_direction != DMA_NONE) {
+			fp = 2 + cdb_offset;
+			goto invalid_fld;
+		}
+
+		if (ata_is_ncq(tf->protocol))
+			tf->protocol = ATA_PROT_NCQ_NODATA;
+	}
+
+	/* enable LBA */
+	tf->flags |= ATA_TFLAG_LBA;
+
+	/*
+	 * 12 and 16 byte CDBs use different offsets to
+	 * provide the various register values.
+	 */
+	if (cdb[0] == ATA_16) {
+		/*
+		 * 16-byte CDB - may contain extended commands.
+		 *
+		 * If that is the case, copy the upper byte register values.
+		 */
+		if (cdb[1] & 0x01) {
+			tf->hob_feature = cdb[3];
+			tf->hob_nsect = cdb[5];
+			tf->hob_lbal = cdb[7];
+			tf->hob_lbam = cdb[9];
+			tf->hob_lbah = cdb[11];
+			tf->flags |= ATA_TFLAG_LBA48;
+		} else
+			tf->flags &= ~ATA_TFLAG_LBA48;
+
+		/*
+		 * Always copy low byte, device and command registers.
+		 */
+		tf->feature = cdb[4];
+		tf->nsect = cdb[6];
+		tf->lbal = cdb[8];
+		tf->lbam = cdb[10];
+		tf->lbah = cdb[12];
+		tf->device = cdb[13];
+		tf->command = cdb[14];
+	} else if (cdb[0] == ATA_12) {
+		/*
+		 * 12-byte CDB - incapable of extended commands.
+		 */
+		tf->flags &= ~ATA_TFLAG_LBA48;
+
+		tf->feature = cdb[3];
+		tf->nsect = cdb[4];
+		tf->lbal = cdb[5];
+		tf->lbam = cdb[6];
+		tf->lbah = cdb[7];
+		tf->device = cdb[8];
+		tf->command = cdb[9];
+	} else {
+		/*
+		 * 32-byte CDB - may contain extended command fields.
+		 *
+		 * If that is the case, copy the upper byte register values.
+		 */
+		if (cdb[10] & 0x01) {
+			tf->hob_feature = cdb[20];
+			tf->hob_nsect = cdb[22];
+			tf->hob_lbal = cdb[16];
+			tf->hob_lbam = cdb[15];
+			tf->hob_lbah = cdb[14];
+			tf->flags |= ATA_TFLAG_LBA48;
+		} else
+			tf->flags &= ~ATA_TFLAG_LBA48;
+
+		tf->feature = cdb[21];
+		tf->nsect = cdb[23];
+		tf->lbal = cdb[19];
+		tf->lbam = cdb[18];
+		tf->lbah = cdb[17];
+		tf->device = cdb[24];
+		tf->command = cdb[25];
+		tf->auxiliary = get_unaligned_be32(&cdb[28]);
+	}
+
+	/* For NCQ commands copy the tag value */
+	if (ata_is_ncq(tf->protocol))
+		tf->nsect = qc->hw_tag << 3;
+
+	/* enforce correct master/slave bit */
+	tf->device = dev->devno ?
+		tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
+
+	switch (tf->command) {
+	/* READ/WRITE LONG use a non-standard sect_size */
+	case ATA_CMD_READ_LONG:
+	case ATA_CMD_READ_LONG_ONCE:
+	case ATA_CMD_WRITE_LONG:
+	case ATA_CMD_WRITE_LONG_ONCE:
+		if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) {
+			fp = 1;
+			goto invalid_fld;
+		}
+		qc->sect_size = scsi_bufflen(scmd);
+		break;
+
+	/* commands using reported Logical Block size (e.g. 512 or 4K) */
+	case ATA_CMD_CFA_WRITE_NE:
+	case ATA_CMD_CFA_TRANS_SECT:
+	case ATA_CMD_CFA_WRITE_MULT_NE:
+	/* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
+	case ATA_CMD_READ:
+	case ATA_CMD_READ_EXT:
+	case ATA_CMD_READ_QUEUED:
+	/* XXX: case ATA_CMD_READ_QUEUED_EXT: */
+	case ATA_CMD_FPDMA_READ:
+	case ATA_CMD_READ_MULTI:
+	case ATA_CMD_READ_MULTI_EXT:
+	case ATA_CMD_PIO_READ:
+	case ATA_CMD_PIO_READ_EXT:
+	case ATA_CMD_READ_STREAM_DMA_EXT:
+	case ATA_CMD_READ_STREAM_EXT:
+	case ATA_CMD_VERIFY:
+	case ATA_CMD_VERIFY_EXT:
+	case ATA_CMD_WRITE:
+	case ATA_CMD_WRITE_EXT:
+	case ATA_CMD_WRITE_FUA_EXT:
+	case ATA_CMD_WRITE_QUEUED:
+	case ATA_CMD_WRITE_QUEUED_FUA_EXT:
+	case ATA_CMD_FPDMA_WRITE:
+	case ATA_CMD_WRITE_MULTI:
+	case ATA_CMD_WRITE_MULTI_EXT:
+	case ATA_CMD_WRITE_MULTI_FUA_EXT:
+	case ATA_CMD_PIO_WRITE:
+	case ATA_CMD_PIO_WRITE_EXT:
+	case ATA_CMD_WRITE_STREAM_DMA_EXT:
+	case ATA_CMD_WRITE_STREAM_EXT:
+		qc->sect_size = scmd->device->sector_size;
+		break;
+
+	/* Everything else uses 512 byte "sectors" */
+	default:
+		qc->sect_size = ATA_SECT_SIZE;
+	}
+
+	/*
+	 * Set flags so that all registers will be written, pass on
+	 * write indication (used for PIO/DMA setup), result TF is
+	 * copied back and we don't whine too much about its failure.
+	 */
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+	if (scmd->sc_data_direction == DMA_TO_DEVICE)
+		tf->flags |= ATA_TFLAG_WRITE;
+
+	qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
+
+	/*
+	 * Set transfer length.
+	 *
+	 * TODO: find out if we need to do more here to
+	 *       cover scatter/gather case.
+	 */
+	ata_qc_set_pc_nbytes(qc);
+
+	/* We may not issue DMA commands if no DMA mode is set */
+	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) {
+		fp = 1;
+		goto invalid_fld;
+	}
+
+	/* We may not issue NCQ commands to devices not supporting NCQ */
+	if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) {
+		fp = 1;
+		goto invalid_fld;
+	}
+
+	/* sanity check for pio multi commands */
+	if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) {
+		fp = 1;
+		goto invalid_fld;
+	}
+
+	if (is_multi_taskfile(tf)) {
+		unsigned int multi_count = 1 << (cdb[1] >> 5);
+
+		/* compare the passed through multi_count
+		 * with the cached multi_count of libata
+		 */
+		if (multi_count != dev->multi_count)
+			ata_dev_warn(dev, "invalid multi_count %u ignored\n",
+				     multi_count);
+	}
+
+	/*
+	 * Filter SET_FEATURES - XFER MODE command -- otherwise,
+	 * SET_FEATURES - XFER MODE must be preceded/succeeded
+	 * by an update to hardware-specific registers for each
+	 * controller (i.e. the reason for ->set_piomode(),
+	 * ->set_dmamode(), and ->post_set_mode() hooks).
+	 */
+	if (tf->command == ATA_CMD_SET_FEATURES &&
+	    tf->feature == SETFEATURES_XFER) {
+		fp = (cdb[0] == ATA_16) ? 4 : 3;
+		goto invalid_fld;
+	}
+
+	/*
+	 * Filter TPM commands by default. These provide an
+	 * essentially uncontrolled encrypted "back door" between
+	 * applications and the disk. Set libata.allow_tpm=1 if you
+	 * have a real reason for wanting to use them. This ensures
+	 * that installed software cannot easily mess stuff up without
+	 * user intent. DVR type users will probably ship with this enabled
+	 * for movie content management.
+	 *
+	 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
+	 * for this and should do in future but that it is not sufficient as
+	 * DCS is an optional feature set. Thus we also do the software filter
+	 * so that we comply with the TC consortium stated goal that the user
+	 * can turn off TC features of their system.
+	 */
+	if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) {
+		fp = (cdb[0] == ATA_16) ? 14 : 9;
+		goto invalid_fld;
+	}
+
+	return 0;
+
+ invalid_fld:
+	ata_scsi_set_invalid_field(dev, scmd, fp, 0xff);
+	return 1;
+}
+
+/**
+ * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim
+ * @cmd: SCSI command being translated
+ * @trmax: Maximum number of entries that will fit in sector_size bytes.
+ * @sector: Starting sector
+ * @count: Total Range of request in logical sectors
+ *
+ * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted
+ * descriptor.
+ *
+ * Upto 64 entries of the format:
+ *   63:48 Range Length
+ *   47:0  LBA
+ *
+ *  Range Length of 0 is ignored.
+ *  LBA's should be sorted order and not overlap.
+ *
+ * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET
+ *
+ * Return: Number of bytes copied into sglist.
+ */
+static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax,
+					u64 sector, u32 count)
+{
+	struct scsi_device *sdp = cmd->device;
+	size_t len = sdp->sector_size;
+	size_t r;
+	__le64 *buf;
+	u32 i = 0;
+	unsigned long flags;
+
+	WARN_ON(len > ATA_SCSI_RBUF_SIZE);
+
+	if (len > ATA_SCSI_RBUF_SIZE)
+		len = ATA_SCSI_RBUF_SIZE;
+
+	spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
+	buf = ((void *)ata_scsi_rbuf);
+	memset(buf, 0, len);
+	while (i < trmax) {
+		u64 entry = sector |
+			((u64)(count > 0xffff ? 0xffff : count) << 48);
+		buf[i++] = __cpu_to_le64(entry);
+		if (count <= 0xffff)
+			break;
+		count -= 0xffff;
+		sector += 0xffff;
+	}
+	r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len);
+	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
+
+	return r;
+}
+
+/**
+ * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same
+ * @qc: Command to be translated
+ *
+ * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or
+ * an SCT Write Same command.
+ * Based on WRITE SAME has the UNMAP flag:
+ *
+ *   - When set translate to DSM TRIM
+ *   - When clear translate to SCT Write Same
+ */
+static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct scsi_device *sdp = scmd->device;
+	size_t len = sdp->sector_size;
+	struct ata_device *dev = qc->dev;
+	const u8 *cdb = scmd->cmnd;
+	u64 block;
+	u32 n_block;
+	const u32 trmax = len >> 3;
+	u32 size;
+	u16 fp;
+	u8 bp = 0xff;
+	u8 unmap = cdb[1] & 0x8;
+
+	/* we may not issue DMA commands if no DMA mode is set */
+	if (unlikely(!dev->dma_mode))
+		goto invalid_opcode;
+
+	/*
+	 * We only allow sending this command through the block layer,
+	 * as it modifies the DATA OUT buffer, which would corrupt user
+	 * memory for SG_IO commands.
+	 */
+	if (unlikely(blk_rq_is_passthrough(scmd->request)))
+		goto invalid_opcode;
+
+	if (unlikely(scmd->cmd_len < 16)) {
+		fp = 15;
+		goto invalid_fld;
+	}
+	scsi_16_lba_len(cdb, &block, &n_block);
+
+	if (!unmap ||
+	    (dev->horkage & ATA_HORKAGE_NOTRIM) ||
+	    !ata_id_has_trim(dev->id)) {
+		fp = 1;
+		bp = 3;
+		goto invalid_fld;
+	}
+	/* If the request is too large the cmd is invalid */
+	if (n_block > 0xffff * trmax) {
+		fp = 2;
+		goto invalid_fld;
+	}
+
+	/*
+	 * WRITE SAME always has a sector sized buffer as payload, this
+	 * should never be a multiple entry S/G list.
+	 */
+	if (!scsi_sg_count(scmd))
+		goto invalid_param_len;
+
+	/*
+	 * size must match sector size in bytes
+	 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count)
+	 * is defined as number of 512 byte blocks to be transferred.
+	 */
+
+	size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);
+	if (size != len)
+		goto invalid_param_len;
+
+	if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
+		/* Newer devices support queued TRIM commands */
+		tf->protocol = ATA_PROT_NCQ;
+		tf->command = ATA_CMD_FPDMA_SEND;
+		tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
+		tf->nsect = qc->hw_tag << 3;
+		tf->hob_feature = (size / 512) >> 8;
+		tf->feature = size / 512;
+
+		tf->auxiliary = 1;
+	} else {
+		tf->protocol = ATA_PROT_DMA;
+		tf->hob_feature = 0;
+		tf->feature = ATA_DSM_TRIM;
+		tf->hob_nsect = (size / 512) >> 8;
+		tf->nsect = size / 512;
+		tf->command = ATA_CMD_DSM;
+	}
+
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
+		     ATA_TFLAG_WRITE;
+
+	ata_qc_set_pc_nbytes(qc);
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_invalid_field(dev, scmd, fp, bp);
+	return 1;
+invalid_param_len:
+	/* "Parameter list length error" */
+	ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
+	return 1;
+invalid_opcode:
+	/* "Invalid command operation code" */
+	ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0);
+	return 1;
+}
+
+/**
+ *	ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN
+ *	@args: device MAINTENANCE_IN data / SCSI command of interest.
+ *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ *
+ *	Yields a subset to satisfy scsi_report_opcode()
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
+{
+	struct ata_device *dev = args->dev;
+	u8 *cdb = args->cmd->cmnd;
+	u8 supported = 0;
+	unsigned int err = 0;
+
+	if (cdb[2] != 1) {
+		ata_dev_warn(dev, "invalid command format %d\n", cdb[2]);
+		err = 2;
+		goto out;
+	}
+	switch (cdb[3]) {
+	case INQUIRY:
+	case MODE_SENSE:
+	case MODE_SENSE_10:
+	case READ_CAPACITY:
+	case SERVICE_ACTION_IN_16:
+	case REPORT_LUNS:
+	case REQUEST_SENSE:
+	case SYNCHRONIZE_CACHE:
+	case REZERO_UNIT:
+	case SEEK_6:
+	case SEEK_10:
+	case TEST_UNIT_READY:
+	case SEND_DIAGNOSTIC:
+	case MAINTENANCE_IN:
+	case READ_6:
+	case READ_10:
+	case READ_16:
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_16:
+	case ATA_12:
+	case ATA_16:
+	case VERIFY:
+	case VERIFY_16:
+	case MODE_SELECT:
+	case MODE_SELECT_10:
+	case START_STOP:
+		supported = 3;
+		break;
+	case ZBC_IN:
+	case ZBC_OUT:
+		if (ata_id_zoned_cap(dev->id) ||
+		    dev->class == ATA_DEV_ZAC)
+			supported = 3;
+		break;
+	case SECURITY_PROTOCOL_IN:
+	case SECURITY_PROTOCOL_OUT:
+		if (dev->flags & ATA_DFLAG_TRUSTED)
+			supported = 3;
+		break;
+	default:
+		break;
+	}
+out:
+	rbuf[1] = supported; /* supported */
+	return err;
+}
+
+/**
+ *	ata_scsi_report_zones_complete - convert ATA output
+ *	@qc: command structure returning the data
+ *
+ *	Convert T-13 little-endian field representation into
+ *	T-10 big-endian field representation.
+ *	What a mess.
+ */
+static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct sg_mapping_iter miter;
+	unsigned long flags;
+	unsigned int bytes = 0;
+
+	sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
+		       SG_MITER_TO_SG | SG_MITER_ATOMIC);
+
+	local_irq_save(flags);
+	while (sg_miter_next(&miter)) {
+		unsigned int offset = 0;
+
+		if (bytes == 0) {
+			char *hdr;
+			u32 list_length;
+			u64 max_lba, opt_lba;
+			u16 same;
+
+			/* Swizzle header */
+			hdr = miter.addr;
+			list_length = get_unaligned_le32(&hdr[0]);
+			same = get_unaligned_le16(&hdr[4]);
+			max_lba = get_unaligned_le64(&hdr[8]);
+			opt_lba = get_unaligned_le64(&hdr[16]);
+			put_unaligned_be32(list_length, &hdr[0]);
+			hdr[4] = same & 0xf;
+			put_unaligned_be64(max_lba, &hdr[8]);
+			put_unaligned_be64(opt_lba, &hdr[16]);
+			offset += 64;
+			bytes += 64;
+		}
+		while (offset < miter.length) {
+			char *rec;
+			u8 cond, type, non_seq, reset;
+			u64 size, start, wp;
+
+			/* Swizzle zone descriptor */
+			rec = miter.addr + offset;
+			type = rec[0] & 0xf;
+			cond = (rec[1] >> 4) & 0xf;
+			non_seq = (rec[1] & 2);
+			reset = (rec[1] & 1);
+			size = get_unaligned_le64(&rec[8]);
+			start = get_unaligned_le64(&rec[16]);
+			wp = get_unaligned_le64(&rec[24]);
+			rec[0] = type;
+			rec[1] = (cond << 4) | non_seq | reset;
+			put_unaligned_be64(size, &rec[8]);
+			put_unaligned_be64(start, &rec[16]);
+			put_unaligned_be64(wp, &rec[24]);
+			WARN_ON(offset + 64 > miter.length);
+			offset += 64;
+			bytes += 64;
+		}
+	}
+	sg_miter_stop(&miter);
+	local_irq_restore(flags);
+
+	ata_scsi_qc_complete(qc);
+}
+
+static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	const u8 *cdb = scmd->cmnd;
+	u16 sect, fp = (u16)-1;
+	u8 sa, options, bp = 0xff;
+	u64 block;
+	u32 n_block;
+
+	if (unlikely(scmd->cmd_len < 16)) {
+		ata_dev_warn(qc->dev, "invalid cdb length %d\n",
+			     scmd->cmd_len);
+		fp = 15;
+		goto invalid_fld;
+	}
+	scsi_16_lba_len(cdb, &block, &n_block);
+	if (n_block != scsi_bufflen(scmd)) {
+		ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n",
+			     n_block, scsi_bufflen(scmd));
+		goto invalid_param_len;
+	}
+	sa = cdb[1] & 0x1f;
+	if (sa != ZI_REPORT_ZONES) {
+		ata_dev_warn(qc->dev, "invalid service action %d\n", sa);
+		fp = 1;
+		goto invalid_fld;
+	}
+	/*
+	 * ZAC allows only for transfers in 512 byte blocks,
+	 * and uses a 16 bit value for the transfer count.
+	 */
+	if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) {
+		ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block);
+		goto invalid_param_len;
+	}
+	sect = n_block / 512;
+	options = cdb[14] & 0xbf;
+
+	if (ata_ncq_enabled(qc->dev) &&
+	    ata_fpdma_zac_mgmt_in_supported(qc->dev)) {
+		tf->protocol = ATA_PROT_NCQ;
+		tf->command = ATA_CMD_FPDMA_RECV;
+		tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f;
+		tf->nsect = qc->hw_tag << 3;
+		tf->feature = sect & 0xff;
+		tf->hob_feature = (sect >> 8) & 0xff;
+		tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8);
+	} else {
+		tf->command = ATA_CMD_ZAC_MGMT_IN;
+		tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES;
+		tf->protocol = ATA_PROT_DMA;
+		tf->hob_feature = options;
+		tf->hob_nsect = (sect >> 8) & 0xff;
+		tf->nsect = sect & 0xff;
+	}
+	tf->device = ATA_LBA;
+	tf->lbah = (block >> 16) & 0xff;
+	tf->lbam = (block >> 8) & 0xff;
+	tf->lbal = block & 0xff;
+	tf->hob_lbah = (block >> 40) & 0xff;
+	tf->hob_lbam = (block >> 32) & 0xff;
+	tf->hob_lbal = (block >> 24) & 0xff;
+
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
+	qc->flags |= ATA_QCFLAG_RESULT_TF;
+
+	ata_qc_set_pc_nbytes(qc);
+
+	qc->complete_fn = ata_scsi_report_zones_complete;
+
+	return 0;
+
+invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
+	return 1;
+
+invalid_param_len:
+	/* "Parameter list length error" */
+	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
+	return 1;
+}
+
+static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	struct ata_device *dev = qc->dev;
+	const u8 *cdb = scmd->cmnd;
+	u8 all, sa;
+	u64 block;
+	u32 n_block;
+	u16 fp = (u16)-1;
+
+	if (unlikely(scmd->cmd_len < 16)) {
+		fp = 15;
+		goto invalid_fld;
+	}
+
+	sa = cdb[1] & 0x1f;
+	if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) &&
+	    (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) {
+		fp = 1;
+		goto invalid_fld;
+	}
+
+	scsi_16_lba_len(cdb, &block, &n_block);
+	if (n_block) {
+		/*
+		 * ZAC MANAGEMENT OUT doesn't define any length
+		 */
+		goto invalid_param_len;
+	}
+
+	all = cdb[14] & 0x1;
+	if (all) {
+		/*
+		 * Ignore the block address (zone ID) as defined by ZBC.
+		 */
+		block = 0;
+	} else if (block >= dev->n_sectors) {
+		/*
+		 * Block must be a valid zone ID (a zone start LBA).
+		 */
+		fp = 2;
+		goto invalid_fld;
+	}
+
+	if (ata_ncq_enabled(qc->dev) &&
+	    ata_fpdma_zac_mgmt_out_supported(qc->dev)) {
+		tf->protocol = ATA_PROT_NCQ_NODATA;
+		tf->command = ATA_CMD_NCQ_NON_DATA;
+		tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT;
+		tf->nsect = qc->hw_tag << 3;
+		tf->auxiliary = sa | ((u16)all << 8);
+	} else {
+		tf->protocol = ATA_PROT_NODATA;
+		tf->command = ATA_CMD_ZAC_MGMT_OUT;
+		tf->feature = sa;
+		tf->hob_feature = all;
+	}
+	tf->lbah = (block >> 16) & 0xff;
+	tf->lbam = (block >> 8) & 0xff;
+	tf->lbal = block & 0xff;
+	tf->hob_lbah = (block >> 40) & 0xff;
+	tf->hob_lbam = (block >> 32) & 0xff;
+	tf->hob_lbal = (block >> 24) & 0xff;
+	tf->device = ATA_LBA;
+	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
+
+	return 0;
+
+ invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
+	return 1;
+invalid_param_len:
+	/* "Parameter list length error" */
+	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
+	return 1;
+}
+
+/**
+ *	ata_mselect_caching - Simulate MODE SELECT for caching info page
+ *	@qc: Storage for translated ATA taskfile
+ *	@buf: input buffer
+ *	@len: number of valid bytes in the input buffer
+ *	@fp: out parameter for the failed field on error
+ *
+ *	Prepare a taskfile to modify caching information for the device.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static int ata_mselect_caching(struct ata_queued_cmd *qc,
+			       const u8 *buf, int len, u16 *fp)
+{
+	struct ata_taskfile *tf = &qc->tf;
+	struct ata_device *dev = qc->dev;
+	u8 mpage[CACHE_MPAGE_LEN];
+	u8 wce;
+	int i;
+
+	/*
+	 * The first two bytes of def_cache_mpage are a header, so offsets
+	 * in mpage are off by 2 compared to buf.  Same for len.
+	 */
+
+	if (len != CACHE_MPAGE_LEN - 2) {
+		if (len < CACHE_MPAGE_LEN - 2)
+			*fp = len;
+		else
+			*fp = CACHE_MPAGE_LEN - 2;
+		return -EINVAL;
+	}
+
+	wce = buf[0] & (1 << 2);
+
+	/*
+	 * Check that read-only bits are not modified.
+	 */
+	ata_msense_caching(dev->id, mpage, false);
+	for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) {
+		if (i == 0)
+			continue;
+		if (mpage[i + 2] != buf[i]) {
+			*fp = i;
+			return -EINVAL;
+		}
+	}
+
+	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+	tf->protocol = ATA_PROT_NODATA;
+	tf->nsect = 0;
+	tf->command = ATA_CMD_SET_FEATURES;
+	tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
+	return 0;
+}
+
+/**
+ *	ata_mselect_control - Simulate MODE SELECT for control page
+ *	@qc: Storage for translated ATA taskfile
+ *	@buf: input buffer
+ *	@len: number of valid bytes in the input buffer
+ *	@fp: out parameter for the failed field on error
+ *
+ *	Prepare a taskfile to modify caching information for the device.
+ *
+ *	LOCKING:
+ *	None.
+ */
+static int ata_mselect_control(struct ata_queued_cmd *qc,
+			       const u8 *buf, int len, u16 *fp)
+{
+	struct ata_device *dev = qc->dev;
+	u8 mpage[CONTROL_MPAGE_LEN];
+	u8 d_sense;
+	int i;
+
+	/*
+	 * The first two bytes of def_control_mpage are a header, so offsets
+	 * in mpage are off by 2 compared to buf.  Same for len.
+	 */
+
+	if (len != CONTROL_MPAGE_LEN - 2) {
+		if (len < CONTROL_MPAGE_LEN - 2)
+			*fp = len;
+		else
+			*fp = CONTROL_MPAGE_LEN - 2;
+		return -EINVAL;
+	}
+
+	d_sense = buf[0] & (1 << 2);
+
+	/*
+	 * Check that read-only bits are not modified.
+	 */
+	ata_msense_control(dev, mpage, false);
+	for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) {
+		if (i == 0)
+			continue;
+		if (mpage[2 + i] != buf[i]) {
+			*fp = i;
+			return -EINVAL;
+		}
+	}
+	if (d_sense & (1 << 2))
+		dev->flags |= ATA_DFLAG_D_SENSE;
+	else
+		dev->flags &= ~ATA_DFLAG_D_SENSE;
+	return 0;
+}
+
+/**
+ *	ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands
+ *	@qc: Storage for translated ATA taskfile
+ *
+ *	Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
+ *	Assume this is invoked for direct access devices (e.g. disks) only.
+ *	There should be no block descriptor for other device types.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	const u8 *cdb = scmd->cmnd;
+	u8 pg, spg;
+	unsigned six_byte, pg_len, hdr_len, bd_len;
+	int len;
+	u16 fp = (u16)-1;
+	u8 bp = 0xff;
+	u8 buffer[64];
+	const u8 *p = buffer;
+
+	VPRINTK("ENTER\n");
+
+	six_byte = (cdb[0] == MODE_SELECT);
+	if (six_byte) {
+		if (scmd->cmd_len < 5) {
+			fp = 4;
+			goto invalid_fld;
+		}
+
+		len = cdb[4];
+		hdr_len = 4;
+	} else {
+		if (scmd->cmd_len < 9) {
+			fp = 8;
+			goto invalid_fld;
+		}
+
+		len = (cdb[7] << 8) + cdb[8];
+		hdr_len = 8;
+	}
+
+	/* We only support PF=1, SP=0.  */
+	if ((cdb[1] & 0x11) != 0x10) {
+		fp = 1;
+		bp = (cdb[1] & 0x01) ? 1 : 5;
+		goto invalid_fld;
+	}
+
+	/* Test early for possible overrun.  */
+	if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
+		goto invalid_param_len;
+
+	/* Move past header and block descriptors.  */
+	if (len < hdr_len)
+		goto invalid_param_len;
+
+	if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd),
+			       buffer, sizeof(buffer)))
+		goto invalid_param_len;
+
+	if (six_byte)
+		bd_len = p[3];
+	else
+		bd_len = (p[6] << 8) + p[7];
+
+	len -= hdr_len;
+	p += hdr_len;
+	if (len < bd_len)
+		goto invalid_param_len;
+	if (bd_len != 0 && bd_len != 8) {
+		fp = (six_byte) ? 3 : 6;
+		fp += bd_len + hdr_len;
+		goto invalid_param;
+	}
+
+	len -= bd_len;
+	p += bd_len;
+	if (len == 0)
+		goto skip;
+
+	/* Parse both possible formats for the mode page headers.  */
+	pg = p[0] & 0x3f;
+	if (p[0] & 0x40) {
+		if (len < 4)
+			goto invalid_param_len;
+
+		spg = p[1];
+		pg_len = (p[2] << 8) | p[3];
+		p += 4;
+		len -= 4;
+	} else {
+		if (len < 2)
+			goto invalid_param_len;
+
+		spg = 0;
+		pg_len = p[1];
+		p += 2;
+		len -= 2;
+	}
+
+	/*
+	 * No mode subpages supported (yet) but asking for _all_
+	 * subpages may be valid
+	 */
+	if (spg && (spg != ALL_SUB_MPAGES)) {
+		fp = (p[0] & 0x40) ? 1 : 0;
+		fp += hdr_len + bd_len;
+		goto invalid_param;
+	}
+	if (pg_len > len)
+		goto invalid_param_len;
+
+	switch (pg) {
+	case CACHE_MPAGE:
+		if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) {
+			fp += hdr_len + bd_len;
+			goto invalid_param;
+		}
+		break;
+	case CONTROL_MPAGE:
+		if (ata_mselect_control(qc, p, pg_len, &fp) < 0) {
+			fp += hdr_len + bd_len;
+			goto invalid_param;
+		} else {
+			goto skip; /* No ATA command to send */
+		}
+		break;
+	default:		/* invalid page code */
+		fp = bd_len + hdr_len;
+		goto invalid_param;
+	}
+
+	/*
+	 * Only one page has changeable data, so we only support setting one
+	 * page at a time.
+	 */
+	if (len > pg_len)
+		goto invalid_param;
+
+	return 0;
+
+ invalid_fld:
+	ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
+	return 1;
+
+ invalid_param:
+	ata_scsi_set_invalid_parameter(qc->dev, scmd, fp);
+	return 1;
+
+ invalid_param_len:
+	/* "Parameter list length error" */
+	ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
+	return 1;
+
+ skip:
+	scmd->result = SAM_STAT_GOOD;
+	return 1;
+}
+
+static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma)
+{
+	if (len == 0)
+		return ATA_CMD_TRUSTED_NONDATA;
+	else if (send)
+		return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND;
+	else
+		return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV;
+}
+
+static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	const u8 *cdb = scmd->cmnd;
+	struct ata_taskfile *tf = &qc->tf;
+	u8 secp = cdb[1];
+	bool send = (cdb[0] == SECURITY_PROTOCOL_OUT);
+	u16 spsp = get_unaligned_be16(&cdb[2]);
+	u32 len = get_unaligned_be32(&cdb[6]);
+	bool dma = !(qc->dev->flags & ATA_DFLAG_PIO);
+
+	/*
+	 * We don't support the ATA "security" protocol.
+	 */
+	if (secp == 0xef) {
+		ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0);
+		return 1;
+	}
+
+	if (cdb[4] & 7) { /* INC_512 */
+		if (len > 0xffff) {
+			ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
+			return 1;
+		}
+	} else {
+		if (len > 0x01fffe00) {
+			ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
+			return 1;
+		}
+
+		/* convert to the sector-based ATA addressing */
+		len = (len + 511) / 512;
+	}
+
+	tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO;
+	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA;
+	if (send)
+		tf->flags |= ATA_TFLAG_WRITE;
+	tf->command = ata_scsi_trusted_op(len, send, dma);
+	tf->feature = secp;
+	tf->lbam = spsp & 0xff;
+	tf->lbah = spsp >> 8;
+
+	if (len) {
+		tf->nsect = len & 0xff;
+		tf->lbal = len >> 8;
+	} else {
+		if (!send)
+			tf->lbah = (1 << 7);
+	}
+
+	ata_qc_set_pc_nbytes(qc);
+	return 0;
+}
+
+/**
+ *	ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler
+ *	@qc: Command to be translated
+ *
+ *	Translate a SCSI variable length CDB to specified commands.
+ *	It checks a service action value in CDB to call corresponding handler.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on failure
+ *
+ */
+static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc)
+{
+	struct scsi_cmnd *scmd = qc->scsicmd;
+	const u8 *cdb = scmd->cmnd;
+	const u16 sa = get_unaligned_be16(&cdb[8]);
+
+	/*
+	 * if service action represents a ata pass-thru(32) command,
+	 * then pass it to ata_scsi_pass_thru handler.
+	 */
+	if (sa == ATA_32)
+		return ata_scsi_pass_thru(qc);
+
+	/* unsupported service action */
+	return 1;
+}
+
+/**
+ *	ata_get_xlat_func - check if SCSI to ATA translation is possible
+ *	@dev: ATA device
+ *	@cmd: SCSI command opcode to consider
+ *
+ *	Look up the SCSI command given, and determine whether the
+ *	SCSI command is to be translated or simulated.
+ *
+ *	RETURNS:
+ *	Pointer to translation function if possible, %NULL if not.
+ */
+
+static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
+{
+	switch (cmd) {
+	case READ_6:
+	case READ_10:
+	case READ_16:
+
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_16:
+		return ata_scsi_rw_xlat;
+
+	case WRITE_SAME_16:
+		return ata_scsi_write_same_xlat;
+
+	case SYNCHRONIZE_CACHE:
+		if (ata_try_flush_cache(dev))
+			return ata_scsi_flush_xlat;
+		break;
+
+	case VERIFY:
+	case VERIFY_16:
+		return ata_scsi_verify_xlat;
+
+	case ATA_12:
+	case ATA_16:
+		return ata_scsi_pass_thru;
+
+	case VARIABLE_LENGTH_CMD:
+		return ata_scsi_var_len_cdb_xlat;
+
+	case MODE_SELECT:
+	case MODE_SELECT_10:
+		return ata_scsi_mode_select_xlat;
+		break;
+
+	case ZBC_IN:
+		return ata_scsi_zbc_in_xlat;
+
+	case ZBC_OUT:
+		return ata_scsi_zbc_out_xlat;
+
+	case SECURITY_PROTOCOL_IN:
+	case SECURITY_PROTOCOL_OUT:
+		if (!(dev->flags & ATA_DFLAG_TRUSTED))
+			break;
+		return ata_scsi_security_inout_xlat;
+
+	case START_STOP:
+		return ata_scsi_start_stop_xlat;
+	}
+
+	return NULL;
+}
+
+/**
+ *	ata_scsi_dump_cdb - dump SCSI command contents to dmesg
+ *	@ap: ATA port to which the command was being sent
+ *	@cmd: SCSI command to dump
+ *
+ *	Prints the contents of a SCSI command via printk().
+ */
+
+static inline void ata_scsi_dump_cdb(struct ata_port *ap,
+				     struct scsi_cmnd *cmd)
+{
+#ifdef ATA_VERBOSE_DEBUG
+	struct scsi_device *scsidev = cmd->device;
+
+	VPRINTK("CDB (%u:%d,%d,%lld) %9ph\n",
+		ap->print_id,
+		scsidev->channel, scsidev->id, scsidev->lun,
+		cmd->cmnd);
+#endif
+}
+
+static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
+				      struct ata_device *dev)
+{
+	u8 scsi_op = scmd->cmnd[0];
+	ata_xlat_func_t xlat_func;
+	int rc = 0;
+
+	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
+		if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
+			goto bad_cdb_len;
+
+		xlat_func = ata_get_xlat_func(dev, scsi_op);
+	} else {
+		if (unlikely(!scmd->cmd_len))
+			goto bad_cdb_len;
+
+		xlat_func = NULL;
+		if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
+			/* relay SCSI command to ATAPI device */
+			int len = COMMAND_SIZE(scsi_op);
+			if (unlikely(len > scmd->cmd_len ||
+				     len > dev->cdb_len ||
+				     scmd->cmd_len > ATAPI_CDB_LEN))
+				goto bad_cdb_len;
+
+			xlat_func = atapi_xlat;
+		} else {
+			/* ATA_16 passthru, treat as an ATA command */
+			if (unlikely(scmd->cmd_len > 16))
+				goto bad_cdb_len;
+
+			xlat_func = ata_get_xlat_func(dev, scsi_op);
+		}
+	}
+
+	if (xlat_func)
+		rc = ata_scsi_translate(dev, scmd, xlat_func);
+	else
+		ata_scsi_simulate(dev, scmd);
+
+	return rc;
+
+ bad_cdb_len:
+	DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
+		scmd->cmd_len, scsi_op, dev->cdb_len);
+	scmd->result = DID_ERROR << 16;
+	scmd->scsi_done(scmd);
+	return 0;
+}
+
+/**
+ *	ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
+ *	@shost: SCSI host of command to be sent
+ *	@cmd: SCSI command to be sent
+ *
+ *	In some cases, this function translates SCSI commands into
+ *	ATA taskfiles, and queues the taskfiles to be sent to
+ *	hardware.  In other cases, this function simulates a
+ *	SCSI device by evaluating and responding to certain
+ *	SCSI commands.  This creates the overall effect of
+ *	ATA and ATAPI devices appearing as SCSI devices.
+ *
+ *	LOCKING:
+ *	ATA host lock
+ *
+ *	RETURNS:
+ *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ *	0 otherwise.
+ */
+int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
+{
+	struct ata_port *ap;
+	struct ata_device *dev;
+	struct scsi_device *scsidev = cmd->device;
+	int rc = 0;
+	unsigned long irq_flags;
+
+	ap = ata_shost_to_port(shost);
+
+	spin_lock_irqsave(ap->lock, irq_flags);
+
+	ata_scsi_dump_cdb(ap, cmd);
+
+	dev = ata_scsi_find_dev(ap, scsidev);
+	if (likely(dev))
+		rc = __ata_scsi_queuecmd(cmd, dev);
+	else {
+		cmd->result = (DID_BAD_TARGET << 16);
+		cmd->scsi_done(cmd);
+	}
+
+	spin_unlock_irqrestore(ap->lock, irq_flags);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_simulate - simulate SCSI command on ATA device
+ *	@dev: the target device
+ *	@cmd: SCSI command being sent to device.
+ *
+ *	Interprets and directly executes a select list of SCSI commands
+ *	that can be handled internally.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ */
+
+void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
+{
+	struct ata_scsi_args args;
+	const u8 *scsicmd = cmd->cmnd;
+	u8 tmp8;
+
+	args.dev = dev;
+	args.id = dev->id;
+	args.cmd = cmd;
+
+	switch(scsicmd[0]) {
+	case INQUIRY:
+		if (scsicmd[1] & 2)		   /* is CmdDt set?  */
+			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
+		else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
+		else switch (scsicmd[2]) {
+		case 0x00:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
+			break;
+		case 0x80:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
+			break;
+		case 0x83:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
+			break;
+		case 0x89:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
+			break;
+		case 0xb0:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
+			break;
+		case 0xb1:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
+			break;
+		case 0xb2:
+			ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
+			break;
+		case 0xb6:
+			if (dev->flags & ATA_DFLAG_ZAC) {
+				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6);
+				break;
+			}
+			/* Fallthrough */
+		default:
+			ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
+			break;
+		}
+		break;
+
+	case MODE_SENSE:
+	case MODE_SENSE_10:
+		ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
+		break;
+
+	case READ_CAPACITY:
+		ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+		break;
+
+	case SERVICE_ACTION_IN_16:
+		if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
+			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+		else
+			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
+		break;
+
+	case REPORT_LUNS:
+		ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
+		break;
+
+	case REQUEST_SENSE:
+		ata_scsi_set_sense(dev, cmd, 0, 0, 0);
+		cmd->result = (DRIVER_SENSE << 24);
+		break;
+
+	/* if we reach this, then writeback caching is disabled,
+	 * turning this into a no-op.
+	 */
+	case SYNCHRONIZE_CACHE:
+		/* fall through */
+
+	/* no-op's, complete with success */
+	case REZERO_UNIT:
+	case SEEK_6:
+	case SEEK_10:
+	case TEST_UNIT_READY:
+		break;
+
+	case SEND_DIAGNOSTIC:
+		tmp8 = scsicmd[1] & ~(1 << 3);
+		if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4])
+			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
+		break;
+
+	case MAINTENANCE_IN:
+		if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
+			ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
+		else
+			ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
+		break;
+
+	/* all other commands */
+	default:
+		ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
+		/* "Invalid command operation code" */
+		break;
+	}
+
+	cmd->scsi_done(cmd);
+}
+
+int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
+{
+	int i, rc;
+
+	for (i = 0; i < host->n_ports; i++) {
+		struct ata_port *ap = host->ports[i];
+		struct Scsi_Host *shost;
+
+		rc = -ENOMEM;
+		shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
+		if (!shost)
+			goto err_alloc;
+
+		shost->eh_noresume = 1;
+		*(struct ata_port **)&shost->hostdata[0] = ap;
+		ap->scsi_host = shost;
+
+		shost->transportt = ata_scsi_transport_template;
+		shost->unique_id = ap->print_id;
+		shost->max_id = 16;
+		shost->max_lun = 1;
+		shost->max_channel = 1;
+		shost->max_cmd_len = 32;
+
+		/* Schedule policy is determined by ->qc_defer()
+		 * callback and it needs to see every deferred qc.
+		 * Set host_blocked to 1 to prevent SCSI midlayer from
+		 * automatically deferring requests.
+		 */
+		shost->max_host_blocked = 1;
+
+		rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev);
+		if (rc)
+			goto err_alloc;
+	}
+
+	return 0;
+
+ err_alloc:
+	while (--i >= 0) {
+		struct Scsi_Host *shost = host->ports[i]->scsi_host;
+
+		/* scsi_host_put() is in ata_devres_release() */
+		scsi_remove_host(shost);
+	}
+	return rc;
+}
+
+void ata_scsi_scan_host(struct ata_port *ap, int sync)
+{
+	int tries = 5;
+	struct ata_device *last_failed_dev = NULL;
+	struct ata_link *link;
+	struct ata_device *dev;
+
+ repeat:
+	ata_for_each_link(link, ap, EDGE) {
+		ata_for_each_dev(dev, link, ENABLED) {
+			struct scsi_device *sdev;
+			int channel = 0, id = 0;
+
+			if (dev->sdev)
+				continue;
+
+			if (ata_is_host_link(link))
+				id = dev->devno;
+			else
+				channel = link->pmp;
+
+			sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
+						 NULL);
+			if (!IS_ERR(sdev)) {
+				dev->sdev = sdev;
+				scsi_device_put(sdev);
+			} else {
+				dev->sdev = NULL;
+			}
+		}
+	}
+
+	/* If we scanned while EH was in progress or allocation
+	 * failure occurred, scan would have failed silently.  Check
+	 * whether all devices are attached.
+	 */
+	ata_for_each_link(link, ap, EDGE) {
+		ata_for_each_dev(dev, link, ENABLED) {
+			if (!dev->sdev)
+				goto exit_loop;
+		}
+	}
+ exit_loop:
+	if (!link)
+		return;
+
+	/* we're missing some SCSI devices */
+	if (sync) {
+		/* If caller requested synchrnous scan && we've made
+		 * any progress, sleep briefly and repeat.
+		 */
+		if (dev != last_failed_dev) {
+			msleep(100);
+			last_failed_dev = dev;
+			goto repeat;
+		}
+
+		/* We might be failing to detect boot device, give it
+		 * a few more chances.
+		 */
+		if (--tries) {
+			msleep(100);
+			goto repeat;
+		}
+
+		ata_port_err(ap,
+			     "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
+	}
+
+	queue_delayed_work(system_long_wq, &ap->hotplug_task,
+			   round_jiffies_relative(HZ));
+}
+
+/**
+ *	ata_scsi_offline_dev - offline attached SCSI device
+ *	@dev: ATA device to offline attached SCSI device for
+ *
+ *	This function is called from ata_eh_hotplug() and responsible
+ *	for taking the SCSI device attached to @dev offline.  This
+ *	function is called with host lock which protects dev->sdev
+ *	against clearing.
+ *
+ *	LOCKING:
+ *	spin_lock_irqsave(host lock)
+ *
+ *	RETURNS:
+ *	1 if attached SCSI device exists, 0 otherwise.
+ */
+int ata_scsi_offline_dev(struct ata_device *dev)
+{
+	if (dev->sdev) {
+		scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
+		return 1;
+	}
+	return 0;
+}
+
+/**
+ *	ata_scsi_remove_dev - remove attached SCSI device
+ *	@dev: ATA device to remove attached SCSI device for
+ *
+ *	This function is called from ata_eh_scsi_hotplug() and
+ *	responsible for removing the SCSI device attached to @dev.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+static void ata_scsi_remove_dev(struct ata_device *dev)
+{
+	struct ata_port *ap = dev->link->ap;
+	struct scsi_device *sdev;
+	unsigned long flags;
+
+	/* Alas, we need to grab scan_mutex to ensure SCSI device
+	 * state doesn't change underneath us and thus
+	 * scsi_device_get() always succeeds.  The mutex locking can
+	 * be removed if there is __scsi_device_get() interface which
+	 * increments reference counts regardless of device state.
+	 */
+	mutex_lock(&ap->scsi_host->scan_mutex);
+	spin_lock_irqsave(ap->lock, flags);
+
+	/* clearing dev->sdev is protected by host lock */
+	sdev = dev->sdev;
+	dev->sdev = NULL;
+
+	if (sdev) {
+		/* If user initiated unplug races with us, sdev can go
+		 * away underneath us after the host lock and
+		 * scan_mutex are released.  Hold onto it.
+		 */
+		if (scsi_device_get(sdev) == 0) {
+			/* The following ensures the attached sdev is
+			 * offline on return from ata_scsi_offline_dev()
+			 * regardless it wins or loses the race
+			 * against this function.
+			 */
+			scsi_device_set_state(sdev, SDEV_OFFLINE);
+		} else {
+			WARN_ON(1);
+			sdev = NULL;
+		}
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+	mutex_unlock(&ap->scsi_host->scan_mutex);
+
+	if (sdev) {
+		ata_dev_info(dev, "detaching (SCSI %s)\n",
+			     dev_name(&sdev->sdev_gendev));
+
+		scsi_remove_device(sdev);
+		scsi_device_put(sdev);
+	}
+}
+
+static void ata_scsi_handle_link_detach(struct ata_link *link)
+{
+	struct ata_port *ap = link->ap;
+	struct ata_device *dev;
+
+	ata_for_each_dev(dev, link, ALL) {
+		unsigned long flags;
+
+		if (!(dev->flags & ATA_DFLAG_DETACHED))
+			continue;
+
+		spin_lock_irqsave(ap->lock, flags);
+		dev->flags &= ~ATA_DFLAG_DETACHED;
+		spin_unlock_irqrestore(ap->lock, flags);
+
+		if (zpodd_dev_enabled(dev))
+			zpodd_exit(dev);
+
+		ata_scsi_remove_dev(dev);
+	}
+}
+
+/**
+ *	ata_scsi_media_change_notify - send media change event
+ *	@dev: Pointer to the disk device with media change event
+ *
+ *	Tell the block layer to send a media change notification
+ *	event.
+ *
+ * 	LOCKING:
+ * 	spin_lock_irqsave(host lock)
+ */
+void ata_scsi_media_change_notify(struct ata_device *dev)
+{
+	if (dev->sdev)
+		sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
+				     GFP_ATOMIC);
+}
+
+/**
+ *	ata_scsi_hotplug - SCSI part of hotplug
+ *	@work: Pointer to ATA port to perform SCSI hotplug on
+ *
+ *	Perform SCSI part of hotplug.  It's executed from a separate
+ *	workqueue after EH completes.  This is necessary because SCSI
+ *	hot plugging requires working EH and hot unplugging is
+ *	synchronized with hot plugging with a mutex.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_hotplug(struct work_struct *work)
+{
+	struct ata_port *ap =
+		container_of(work, struct ata_port, hotplug_task.work);
+	int i;
+
+	if (ap->pflags & ATA_PFLAG_UNLOADING) {
+		DPRINTK("ENTER/EXIT - unloading\n");
+		return;
+	}
+
+	/*
+	 * XXX - UGLY HACK
+	 *
+	 * The block layer suspend/resume path is fundamentally broken due
+	 * to freezable kthreads and workqueue and may deadlock if a block
+	 * device gets removed while resume is in progress.  I don't know
+	 * what the solution is short of removing freezable kthreads and
+	 * workqueues altogether.
+	 *
+	 * The following is an ugly hack to avoid kicking off device
+	 * removal while freezer is active.  This is a joke but does avoid
+	 * this particular deadlock scenario.
+	 *
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
+	 * http://marc.info/?l=linux-kernel&m=138695698516487
+	 */
+#ifdef CONFIG_FREEZER
+	while (pm_freezing)
+		msleep(10);
+#endif
+
+	DPRINTK("ENTER\n");
+	mutex_lock(&ap->scsi_scan_mutex);
+
+	/* Unplug detached devices.  We cannot use link iterator here
+	 * because PMP links have to be scanned even if PMP is
+	 * currently not attached.  Iterate manually.
+	 */
+	ata_scsi_handle_link_detach(&ap->link);
+	if (ap->pmp_link)
+		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
+			ata_scsi_handle_link_detach(&ap->pmp_link[i]);
+
+	/* scan for new ones */
+	ata_scsi_scan_host(ap, 0);
+
+	mutex_unlock(&ap->scsi_scan_mutex);
+	DPRINTK("EXIT\n");
+}
+
+/**
+ *	ata_scsi_user_scan - indication for user-initiated bus scan
+ *	@shost: SCSI host to scan
+ *	@channel: Channel to scan
+ *	@id: ID to scan
+ *	@lun: LUN to scan
+ *
+ *	This function is called when user explicitly requests bus
+ *	scan.  Set probe pending flag and invoke EH.
+ *
+ *	LOCKING:
+ *	SCSI layer (we don't care)
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+		       unsigned int id, u64 lun)
+{
+	struct ata_port *ap = ata_shost_to_port(shost);
+	unsigned long flags;
+	int devno, rc = 0;
+
+	if (!ap->ops->error_handler)
+		return -EOPNOTSUPP;
+
+	if (lun != SCAN_WILD_CARD && lun)
+		return -EINVAL;
+
+	if (!sata_pmp_attached(ap)) {
+		if (channel != SCAN_WILD_CARD && channel)
+			return -EINVAL;
+		devno = id;
+	} else {
+		if (id != SCAN_WILD_CARD && id)
+			return -EINVAL;
+		devno = channel;
+	}
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	if (devno == SCAN_WILD_CARD) {
+		struct ata_link *link;
+
+		ata_for_each_link(link, ap, EDGE) {
+			struct ata_eh_info *ehi = &link->eh_info;
+			ehi->probe_mask |= ATA_ALL_DEVICES;
+			ehi->action |= ATA_EH_RESET;
+		}
+	} else {
+		struct ata_device *dev = ata_find_dev(ap, devno);
+
+		if (dev) {
+			struct ata_eh_info *ehi = &dev->link->eh_info;
+			ehi->probe_mask |= 1 << dev->devno;
+			ehi->action |= ATA_EH_RESET;
+		} else
+			rc = -EINVAL;
+	}
+
+	if (rc == 0) {
+		ata_port_schedule_eh(ap);
+		spin_unlock_irqrestore(ap->lock, flags);
+		ata_port_wait_eh(ap);
+	} else
+		spin_unlock_irqrestore(ap->lock, flags);
+
+	return rc;
+}
+
+/**
+ *	ata_scsi_dev_rescan - initiate scsi_rescan_device()
+ *	@work: Pointer to ATA port to perform scsi_rescan_device()
+ *
+ *	After ATA pass thru (SAT) commands are executed successfully,
+ *	libata need to propagate the changes to SCSI layer.
+ *
+ *	LOCKING:
+ *	Kernel thread context (may sleep).
+ */
+void ata_scsi_dev_rescan(struct work_struct *work)
+{
+	struct ata_port *ap =
+		container_of(work, struct ata_port, scsi_rescan_task);
+	struct ata_link *link;
+	struct ata_device *dev;
+	unsigned long flags;
+
+	mutex_lock(&ap->scsi_scan_mutex);
+	spin_lock_irqsave(ap->lock, flags);
+
+	ata_for_each_link(link, ap, EDGE) {
+		ata_for_each_dev(dev, link, ENABLED) {
+			struct scsi_device *sdev = dev->sdev;
+
+			if (!sdev)
+				continue;
+			if (scsi_device_get(sdev))
+				continue;
+
+			spin_unlock_irqrestore(ap->lock, flags);
+			scsi_rescan_device(&(sdev->sdev_gendev));
+			scsi_device_put(sdev);
+			spin_lock_irqsave(ap->lock, flags);
+		}
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+	mutex_unlock(&ap->scsi_scan_mutex);
+}
+
+/**
+ *	ata_sas_port_alloc - Allocate port for a SAS attached SATA device
+ *	@host: ATA host container for all SAS ports
+ *	@port_info: Information from low-level host driver
+ *	@shost: SCSI host that the scsi device is attached to
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	ata_port pointer on success / NULL on failure.
+ */
+
+struct ata_port *ata_sas_port_alloc(struct ata_host *host,
+				    struct ata_port_info *port_info,
+				    struct Scsi_Host *shost)
+{
+	struct ata_port *ap;
+
+	ap = ata_port_alloc(host);
+	if (!ap)
+		return NULL;
+
+	ap->port_no = 0;
+	ap->lock = &host->lock;
+	ap->pio_mask = port_info->pio_mask;
+	ap->mwdma_mask = port_info->mwdma_mask;
+	ap->udma_mask = port_info->udma_mask;
+	ap->flags |= port_info->flags;
+	ap->ops = port_info->port_ops;
+	ap->cbl = ATA_CBL_SATA;
+
+	return ap;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
+
+/**
+ *	ata_sas_port_start - Set port up for dma.
+ *	@ap: Port to initialize
+ *
+ *	Called just after data structures for each port are
+ *	initialized.
+ *
+ *	May be used as the port_start() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+int ata_sas_port_start(struct ata_port *ap)
+{
+	/*
+	 * the port is marked as frozen at allocation time, but if we don't
+	 * have new eh, we won't thaw it
+	 */
+	if (!ap->ops->error_handler)
+		ap->pflags &= ~ATA_PFLAG_FROZEN;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_start);
+
+/**
+ *	ata_port_stop - Undo ata_sas_port_start()
+ *	@ap: Port to shut down
+ *
+ *	May be used as the port_stop() entry in ata_port_operations.
+ *
+ *	LOCKING:
+ *	Inherited from caller.
+ */
+
+void ata_sas_port_stop(struct ata_port *ap)
+{
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_stop);
+
+/**
+ * ata_sas_async_probe - simply schedule probing and return
+ * @ap: Port to probe
+ *
+ * For batch scheduling of probe for sas attached ata devices, assumes
+ * the port has already been through ata_sas_port_init()
+ */
+void ata_sas_async_probe(struct ata_port *ap)
+{
+	__ata_port_probe(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_async_probe);
+
+int ata_sas_sync_probe(struct ata_port *ap)
+{
+	return ata_port_probe(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
+
+
+/**
+ *	ata_sas_port_init - Initialize a SATA device
+ *	@ap: SATA port to initialize
+ *
+ *	LOCKING:
+ *	PCI/etc. bus probe sem.
+ *
+ *	RETURNS:
+ *	Zero on success, non-zero on error.
+ */
+
+int ata_sas_port_init(struct ata_port *ap)
+{
+	int rc = ap->ops->port_start(ap);
+
+	if (rc)
+		return rc;
+	ap->print_id = atomic_inc_return(&ata_print_id);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_init);
+
+int ata_sas_tport_add(struct device *parent, struct ata_port *ap)
+{
+	return ata_tport_add(parent, ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_tport_add);
+
+void ata_sas_tport_delete(struct ata_port *ap)
+{
+	ata_tport_delete(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_tport_delete);
+
+/**
+ *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
+ *	@ap: SATA port to destroy
+ *
+ */
+
+void ata_sas_port_destroy(struct ata_port *ap)
+{
+	if (ap->ops->port_stop)
+		ap->ops->port_stop(ap);
+	kfree(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
+
+/**
+ *	ata_sas_slave_configure - Default slave_config routine for libata devices
+ *	@sdev: SCSI device to configure
+ *	@ap: ATA port to which SCSI device is attached
+ *
+ *	RETURNS:
+ *	Zero.
+ */
+
+int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+{
+	ata_scsi_sdev_config(sdev);
+	ata_scsi_dev_config(sdev, ap->link.device);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+
+/**
+ *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
+ *	@cmd: SCSI command to be sent
+ *	@ap:	ATA port to which the command is being sent
+ *
+ *	RETURNS:
+ *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ *	0 otherwise.
+ */
+
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
+{
+	int rc = 0;
+
+	ata_scsi_dump_cdb(ap, cmd);
+
+	if (likely(ata_dev_enabled(ap->link.device)))
+		rc = __ata_scsi_queuecmd(cmd, ap->link.device);
+	else {
+		cmd->result = (DID_BAD_TARGET << 16);
+		cmd->scsi_done(cmd);
+	}
+	return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
+
+int ata_sas_allocate_tag(struct ata_port *ap)
+{
+	unsigned int max_queue = ap->host->n_tags;
+	unsigned int i, tag;
+
+	for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
+		tag = tag < max_queue ? tag : 0;
+
+		/* the last tag is reserved for internal command. */
+		if (ata_tag_internal(tag))
+			continue;
+
+		if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
+			ap->sas_last_tag = tag;
+			return tag;
+		}
+	}
+	return -1;
+}
+
+void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
+{
+	clear_bit(tag, &ap->sas_tag_allocated);
+}