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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  libata-scsi.c - helper library for ATA
  *
  *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
  *  Copyright 2003-2004 Jeff Garzik
  *
  *  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/compat.h>
 #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 <linux/of.h>
 
 #include "libata.h"
 #include "libata-transport.h"
 
 #define ATA_SCSI_RBUF_SIZE  576
 
 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);
 
 #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 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 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 : sysfs_emit(buf, "%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);
 
 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;
 
     scsi_build_sense(cmd, d_sense, 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 struct attribute *ata_common_sdev_attrs[] = {
     &dev_attr_unload_heads.attr,
     NULL
 };
 
 static const struct attribute_group ata_common_sdev_attr_group = {
     .attrs = ata_common_sdev_attrs
 };
 
 const struct attribute_group *ata_common_sdev_groups[] = {
     &ata_common_sdev_attr_group,
     NULL
 };
 EXPORT_SYMBOL_GPL(ata_common_sdev_groups);
 
 /**
  *  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;
 }
 EXPORT_SYMBOL_GPL(ata_std_bios_param);
 
 /**
  *  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);
 }
 EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
 
 /**
  *  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] = ATA_SMART_LBAM_PASS;
         scsi_cmd[12] = ATA_SMART_LBAH_PASS;
     } 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 (cmd_result < 0) {
         rc = cmd_result;
         goto error;
     }
     if (scsi_sense_valid(&sshdr)) {/* sense data available */
         u8 *desc = sensebuf + 8;
 
         /* If we set cc then ATA pass-through will cause a
          * check condition even if no error. Filter that. */
         if (scsi_status_is_check_condition(cmd_result)) {
             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 (cmd_result < 0) {
         rc = cmd_result;
         goto error;
     }
     if (scsi_sense_valid(&sshdr)) {/* sense data available */
         u8 *desc = sensebuf + 8;
 
         /* 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 bool ata_ioc32(struct ata_port *ap)
 {
     if (ap->flags & ATA_FLAG_PIO_DMA)
         return true;
     if (ap->pflags & ATA_PFLAG_PIO32)
         return true;
     return false;
 }
 
 /*
  * This handles both native and compat commands, so anything added
  * here must have a compatible argument, or check in_compat_syscall()
  */
 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
              unsigned 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);
 #ifdef CONFIG_COMPAT
         if (in_compat_syscall())
             return put_user(val, (compat_ulong_t __user *)arg);
 #endif
         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, unsigned 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_port *ap = dev->link->ap;
     struct ata_queued_cmd *qc;
     int tag;
 
     if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
         goto fail;
 
     if (ap->flags & ATA_FLAG_SAS_HOST) {
         /*
          * SAS hosts may queue > ATA_MAX_QUEUE commands so use
          * unique per-device budget token as a tag.
          */
         if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE))
             goto fail;
         tag = cmd->budget_token;
     } else {
         tag = scsi_cmd_to_rq(cmd)->tag;
     }
 
     qc = __ata_qc_from_tag(ap, tag);
     qc->tag = qc->hw_tag = tag;
     qc->ap = ap;
     qc->dev = dev;
 
     ata_qc_reinit(qc);
 
     qc->scsicmd = cmd;
     qc->scsidone = scsi_done;
 
     qc->sg = scsi_sglist(cmd);
     qc->n_elem = scsi_sg_count(cmd);
 
     if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET)
         qc->flags |= ATA_QCFLAG_QUIET;
 
     return qc;
 
 fail:
     set_host_byte(cmd, DID_OK);
     set_status_byte(cmd, SAM_STAT_TASK_SET_FULL);
     scsi_done(cmd);
     return NULL;
 }
 
 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
 {
     struct scsi_cmnd *scmd = qc->scsicmd;
 
     qc->extrabytes = scmd->extra_len;
     qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
 }
 
 /**
  *  ata_dump_status - user friendly display of error info
  *  @ap: 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(struct ata_port *ap, struct ata_taskfile *tf)
 {
     u8 stat = tf->status, err = tf->error;
 
     if (stat & ATA_BUSY) {
         ata_port_warn(ap, "status=0x%02x {Busy} ", stat);
     } else {
         ata_port_warn(ap, "status=0x%02x { %s%s%s%s%s%s%s} ", stat,
                   stat & ATA_DRDY ? "DriveReady " : "",
                   stat & ATA_DF ? "DeviceFault " : "",
                   stat & ATA_DSC ? "SeekComplete " : "",
                   stat & ATA_DRQ ? "DataRequest " : "",
                   stat & ATA_CORR ? "CorrectedError " : "",
                   stat & ATA_SENSE ? "Sense " : "",
                   stat & ATA_ERR ? "Error " : "");
         if (err)
             ata_port_warn(ap, "error=0x%02x {%s%s%s%s%s%s", err,
                       err & ATA_ABORTED ?
                       "DriveStatusError " : "",
                       err & ATA_ICRC ?
                       (err & ATA_ABORTED ?
                        "BadCRC " : "Sector ") : "",
                       err & ATA_UNC ? "UncorrectableError " : "",
                       err & ATA_IDNF ? "SectorIdNotFound " : "",
                       err & ATA_TRK0NF ? "TrackZeroNotFound " : "",
                       err & ATA_AMNF ? "AddrMarkNotFound " : "");
     }
 }
 
 /**
  *  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);
 
     /*
      * Use ata_to_sense_error() to map status register bits
      * onto sense key, asc & ascq.
      */
     if (qc->err_mask ||
         tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
         ata_to_sense_error(qc->ap->print_id, tf->status, tf->error,
                    &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(cmd, 1, 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->error;
         desc[5] = tf->nsect;
         desc[7] = tf->lbal;
         desc[9] = tf->lbam;
         desc[11] = tf->lbah;
         desc[12] = tf->device;
         desc[13] = tf->status;
 
         /*
          * 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->error;
         desc[1] = tf->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);
 
     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->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
         ata_to_sense_error(qc->ap->print_id, tf->status, tf->error,
                    &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->status, 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);
 }
 
 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;
 }
 
 /**
  *  ata_scsi_dma_need_drain - 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.
  */
 bool ata_scsi_dma_need_drain(struct request *rq)
 {
     struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
 
     return atapi_cmd_type(scmd->cmnd[0]) == ATAPI_MISC;
 }
 EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain);
 
 int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
 {
     struct request_queue *q = sdev->request_queue;
     int depth = 1;
 
     if (!ata_id_has_unload(dev->id))
         dev->flags |= ATA_DFLAG_NO_UNLOAD;
 
     /* configure max sectors */
     dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors);
     blk_queue_max_hw_sectors(q, dev->max_sectors);
 
     if (dev->class == ATA_DEV_ATAPI) {
         sdev->sector_size = ATA_SECT_SIZE;
 
         /* set DMA padding */
         blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
 
         /* make room for appending the drain */
         blk_queue_max_segments(q, queue_max_segments(q) - 1);
 
         sdev->dma_drain_len = ATAPI_MAX_DRAIN;
         sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO);
         if (!sdev->dma_drain_buf) {
             ata_dev_err(dev, "drain buffer allocation failed\n");
             return -ENOMEM;
         }
     } 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)
         depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
     depth = min(ATA_MAX_QUEUE, depth);
     scsi_change_queue_depth(sdev, depth);
 
     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;
 }
 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
 
 /**
  *  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);
     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(sdev->dma_drain_buf);
 }
 EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
 
 /**
  *  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;
 
     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 inline void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
 {
     *plba = get_unaligned_be32(&cdb[2]);
     *plen = get_unaligned_be16(&cdb[7]);
 }
 
 /**
  *  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 inline void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
 {
     *plba = get_unaligned_be64(&cdb[2]);
     *plen = get_unaligned_be32(&cdb[10]);
 }
 
 /**
  *  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;
 
     switch (cdb[0]) {
     case VERIFY:
         if (scmd->cmd_len < 10) {
             fp = 9;
             goto invalid_fld;
         }
         scsi_10_lba_len(cdb, &block, &n_block);
         break;
     case VERIFY_16:
         if (scmd->cmd_len < 16) {
             fp = 15;
             goto invalid_fld;
         }
         scsi_16_lba_len(cdb, &block, &n_block);
         break;
     default:
         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;
 
         /* 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 = scsi_cmd_to_rq(scmd);
     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 = scsi_cmd_to_rq(scmd);
     int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
     unsigned int tf_flags = 0;
     u64 block;
     u32 n_block;
     int rc;
     u16 fp = 0;
 
     switch (cdb[0]) {
     case WRITE_6:
     case WRITE_10:
     case WRITE_16:
         tf_flags |= ATA_TFLAG_WRITE;
         break;
     }
 
     /* 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:
         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, &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;
 
     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);
 
     return 0;
 
 early_finish:
     ata_qc_free(qc);
     scsi_done(cmd);
     return 0;
 
 err_did:
     ata_qc_free(qc);
     cmd->result = (DID_ERROR << 16);
     scsi_done(cmd);
 err_mem:
     return 0;
 
 defer:
     ata_qc_free(qc);
     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_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))
 {
     unsigned int rc;
     struct scsi_cmnd *cmd = args->cmd;
     unsigned long flags;
 
     spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
 
     memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
     rc = actor(args, ata_scsi_rbuf);
     if (rc == 0)
         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);
 
     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
     };
 
     /* 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 i, num_pages = 0;
     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 */
         0xb9,   /* page 0xb9, concurrent positioning ranges */
     };
 
     for (i = 0; i < sizeof(pages); i++) {
         if (pages[i] == 0xb6 &&
             !(args->dev->flags & ATA_DFLAG_ZAC))
             continue;
         rbuf[num_pages + 4] = pages[i];
         num_pages++;
     }
     rbuf[3] = num_pages;    /* number of supported VPD 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)
 {
     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);
 
     rbuf[36] = 0x34;        /* force D2H Reg FIS (34h) */
     rbuf[37] = (1 << 7);        /* bit 7 indicates Command FIS */
                     /* TODO: PMP? */
 
     /* we don't store the ATA device signature, so we fake it */
     rbuf[38] = ATA_DRDY;        /* really, this is Status reg */
     rbuf[40] = 0x1;
     rbuf[48] = 0x1;
 
     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;
 }
 
 static unsigned int ata_scsiop_inq_b9(struct ata_scsi_args *args, u8 *rbuf)
 {
     struct ata_cpr_log *cpr_log = args->dev->cpr_log;
     u8 *desc = &rbuf[64];
     int i;
 
     /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */
     rbuf[1] = 0xb9;
     put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]);
 
     for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) {
         desc[0] = cpr_log->cpr[i].num;
         desc[1] = cpr_log->cpr[i].num_storage_elements;
         put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]);
         put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[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;
 
     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);
 
     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)
 {
     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;
 
     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.error >> 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);
 }
 
 /*
  * 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;
 
     /* 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;
     }
 
     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 pointer 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.
  */
 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.
      */
     switch (cdb[0]) {
     case 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];
         break;
     case 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];
         break;
     default:
         /*
          * 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]);
         break;
     }
 
     /* 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 && !ata_dma_enabled(dev)) {
         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(!ata_dma_enabled(dev)))
         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(scsi_cmd_to_rq(scmd))))
         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) {
         *fp = min(len, 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) {
         *fp = min(len, 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;
 
     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 = get_unaligned_be16(&cdb[7]);
         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 = get_unaligned_be16(&p[6]);
 
     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 = get_unaligned_be16(&p[2]);
         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;
 
     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;
 }
 
 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
 {
     u8 scsi_op = scmd->cmnd[0];
     ata_xlat_func_t xlat_func;
 
     if (unlikely(!scmd->cmd_len))
         goto bad_cdb_len;
 
     if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
         if (unlikely(scmd->cmd_len > dev->cdb_len))
             goto bad_cdb_len;
 
         xlat_func = ata_get_xlat_func(dev, scsi_op);
     } else 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)
         return ata_scsi_translate(dev, scmd, xlat_func);
 
     ata_scsi_simulate(dev, scmd);
 
     return 0;
 
  bad_cdb_len:
     scmd->result = DID_ERROR << 16;
     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);
 
     dev = ata_scsi_find_dev(ap, scsidev);
     if (likely(dev))
         rc = __ata_scsi_queuecmd(cmd, dev);
     else {
         cmd->result = (DID_BAD_TARGET << 16);
         scsi_done(cmd);
     }
 
     spin_unlock_irqrestore(ap->lock, irq_flags);
 
     return rc;
 }
 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
 
 /**
  *  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);
             else
                 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
             break;
         case 0xb9:
             if (dev->cpr_log)
                 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b9);
             else
                 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
             break;
         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);
         break;
 
     /* if we reach this, then writeback caching is disabled,
      * turning this into a no-op.
      */
     case SYNCHRONIZE_CACHE:
         fallthrough;
 
     /* 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;
     }
 
     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;
 }
 
 #ifdef CONFIG_OF
 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
 {
     struct scsi_device *sdev = dev->sdev;
     struct device *d = ap->host->dev;
     struct device_node *np = d->of_node;
     struct device_node *child;
 
     for_each_available_child_of_node(np, child) {
         int ret;
         u32 val;
 
         ret = of_property_read_u32(child, "reg", &val);
         if (ret)
             continue;
         if (val == dev->devno) {
             dev_dbg(d, "found matching device node\n");
             sdev->sdev_gendev.of_node = child;
             return;
         }
     }
 }
 #else
 static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
 {
 }
 #endif
 
 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;
                 ata_scsi_assign_ofnode(dev, ap);
                 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)
         return;
 
     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);
 }
 
 /**
  *  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);
 }