--- /dev/null
+/*
+ * libata-scsi.c - helper library for ATA
+ *
+ * Maintained by: Jeff Garzik <jgarzik@pobox.com>
+ * Please ALWAYS copy linux-ide@vger.kernel.org
+ * on emails.
+ *
+ * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
+ * Copyright 2003-2004 Jeff Garzik
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * libata documentation is available via 'make {ps|pdf}docs',
+ * as Documentation/DocBook/libata.*
+ *
+ * Hardware documentation available from
+ * - http://www.t10.org/
+ * - http://www.t13.org/
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.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 <asm/uaccess.h>
+
+#include "libata.h"
+
+#define SECTOR_SIZE 512
+
+typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev);
+static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev);
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+ unsigned int id, unsigned int lun);
+
+
+#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,
+ RW_RECOVERY_MPAGE_LEN - 2,
+ (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
+ (1 << 6), /* ARRE (auto read reallocation) */
+ 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 */
+};
+
+/*
+ * libata transport template. libata doesn't do real transport stuff.
+ * It just needs the eh_timed_out hook.
+ */
+struct scsi_transport_template ata_scsi_transport_template = {
+ .eh_strategy_handler = ata_scsi_error,
+ .eh_timed_out = ata_scsi_timed_out,
+ .user_scan = ata_scsi_user_scan,
+};
+
+
+static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *))
+{
+ ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ /* "Invalid field in cbd" */
+ done(cmd);
+}
+
+/**
+ * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
+ * @sdev: SCSI device for which BIOS geometry is to be determined
+ * @bdev: block device associated with @sdev
+ * @capacity: capacity of SCSI device
+ * @geom: location to which geometry will be output
+ *
+ * Generic bios head/sector/cylinder calculator
+ * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
+ * mapping. Some situations may arise where the disk is not
+ * bootable if this is not used.
+ *
+ * LOCKING:
+ * Defined by the SCSI layer. We don't really care.
+ *
+ * RETURNS:
+ * Zero.
+ */
+int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
+ sector_t capacity, int geom[])
+{
+ geom[0] = 255;
+ geom[1] = 63;
+ sector_div(capacity, 255*63);
+ geom[2] = capacity;
+
+ return 0;
+}
+
+/**
+ * ata_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 scsi_cmd[MAX_COMMAND_SIZE];
+ u8 args[4], *argbuf = NULL, *sensebuf = NULL;
+ int argsize = 0;
+ enum dma_data_direction data_dir;
+ int cmd_result;
+
+ if (arg == NULL)
+ return -EINVAL;
+
+ if (copy_from_user(args, arg, sizeof(args)))
+ return -EFAULT;
+
+ sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
+ if (!sensebuf)
+ return -ENOMEM;
+
+ memset(scsi_cmd, 0, sizeof(scsi_cmd));
+
+ if (args[3]) {
+ argsize = SECTOR_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] == WIN_SMART) { /* hack -- ide driver does this too... */
+ scsi_cmd[6] = args[3];
+ scsi_cmd[8] = args[1];
+ scsi_cmd[10] = 0x4f;
+ scsi_cmd[12] = 0xc2;
+ } else {
+ scsi_cmd[6] = args[1];
+ }
+ scsi_cmd[14] = args[0];
+
+ /* Good values for timeout and retries? Values below
+ from scsi_ioctl_send_command() for default case... */
+ cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
+ sensebuf, (10*HZ), 5, 0);
+
+ if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+ u8 *desc = sensebuf + 8;
+ cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
+
+ /* If we set cc then ATA pass-through will cause a
+ * check condition even if no error. Filter that. */
+ if (cmd_result & SAM_STAT_CHECK_CONDITION) {
+ struct scsi_sense_hdr sshdr;
+ scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
+ &sshdr);
+ if (sshdr.sense_key==0 &&
+ sshdr.asc==0 && sshdr.ascq==0)
+ 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(sensebuf);
+ 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 scsi_cmd[MAX_COMMAND_SIZE];
+ u8 args[7], *sensebuf = NULL;
+ int cmd_result;
+
+ if (arg == NULL)
+ return -EINVAL;
+
+ if (copy_from_user(args, arg, sizeof(args)))
+ return -EFAULT;
+
+ sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
+ if (!sensebuf)
+ return -ENOMEM;
+
+ 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, (10*HZ), 5, 0);
+
+ if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
+ u8 *desc = sensebuf + 8;
+ cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
+
+ /* If we set cc then ATA pass-through will cause a
+ * check condition even if no error. Filter that. */
+ if (cmd_result & SAM_STAT_CHECK_CONDITION) {
+ struct scsi_sense_hdr sshdr;
+ scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
+ &sshdr);
+ if (sshdr.sense_key==0 &&
+ sshdr.asc==0 && sshdr.ascq==0)
+ 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:
+ kfree(sensebuf);
+ return rc;
+}
+
+int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
+{
+ int val = -EINVAL, rc = -EINVAL;
+
+ switch (cmd) {
+ case ATA_IOC_GET_IO32:
+ val = 0;
+ if (copy_to_user(arg, &val, 1))
+ return -EFAULT;
+ return 0;
+
+ case ATA_IOC_SET_IO32:
+ val = (unsigned long) arg;
+ if (val != 0)
+ return -EINVAL;
+ return 0;
+
+ 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;
+}
+
+/**
+ * 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
+ * @done: SCSI command completion function
+ *
+ * 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.
+ */
+struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
+ struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *))
+{
+ struct ata_queued_cmd *qc;
+
+ qc = ata_qc_new_init(dev);
+ if (qc) {
+ qc->scsicmd = cmd;
+ qc->scsidone = done;
+
+ if (cmd->use_sg) {
+ qc->__sg = (struct scatterlist *) cmd->request_buffer;
+ qc->n_elem = cmd->use_sg;
+ } else if (cmd->request_bufflen) {
+ qc->__sg = &qc->sgent;
+ qc->n_elem = 1;
+ }
+ } else {
+ cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
+ done(cmd);
+ }
+
+ return qc;
+}
+
+/**
+ * ata_dump_status - user friendly display of error info
+ * @id: id of the port in question
+ * @tf: ptr to filled out taskfile
+ *
+ * Decode and dump the ATA error/status registers for the user so
+ * that they have some idea what really happened at the non
+ * make-believe layer.
+ *
+ * LOCKING:
+ * inherited from caller
+ */
+void ata_dump_status(unsigned id, struct ata_taskfile *tf)
+{
+ u8 stat = tf->command, err = tf->feature;
+
+ printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
+ if (stat & ATA_BUSY) {
+ printk("Busy }\n"); /* Data is not valid in this case */
+ } else {
+ if (stat & 0x40) printk("DriveReady ");
+ if (stat & 0x20) printk("DeviceFault ");
+ if (stat & 0x10) printk("SeekComplete ");
+ if (stat & 0x08) printk("DataRequest ");
+ if (stat & 0x04) printk("CorrectedError ");
+ if (stat & 0x02) printk("Index ");
+ if (stat & 0x01) printk("Error ");
+ printk("}\n");
+
+ if (err) {
+ printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
+ if (err & 0x04) printk("DriveStatusError ");
+ if (err & 0x80) {
+ if (err & 0x04) printk("BadCRC ");
+ else printk("Sector ");
+ }
+ if (err & 0x40) printk("UncorrectableError ");
+ if (err & 0x10) printk("SectorIdNotFound ");
+ if (err & 0x02) printk("TrackZeroNotFound ");
+ if (err & 0x01) printk("AddrMarkNotFound ");
+ printk("}\n");
+ }
+ }
+}
+
+/**
+ * ata_scsi_device_suspend - suspend ATA device associated with sdev
+ * @sdev: the SCSI device to suspend
+ * @mesg: target power management message
+ *
+ * Request suspend EH action on the ATA device associated with
+ * @sdev and wait for the operation to complete.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg)
+{
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ unsigned long flags;
+ unsigned int action;
+ int rc = 0;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* wait for the previous resume to complete */
+ while (dev->flags & ATA_DFLAG_SUSPENDED) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ ata_port_wait_eh(ap);
+ spin_lock_irqsave(ap->lock, flags);
+ }
+
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
+
+ /* request suspend */
+ action = ATA_EH_SUSPEND;
+ if (mesg.event != PM_EVENT_SUSPEND)
+ action |= ATA_EH_PM_FREEZE;
+ ap->eh_info.dev_action[dev->devno] |= action;
+ ap->eh_info.flags |= ATA_EHI_QUIET;
+ ata_port_schedule_eh(ap);
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ /* wait for EH to do the job */
+ ata_port_wait_eh(ap);
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* If @sdev is still attached but the associated ATA device
+ * isn't suspended, the operation failed.
+ */
+ if (sdev->sdev_state != SDEV_OFFLINE &&
+ sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
+ !(dev->flags & ATA_DFLAG_SUSPENDED))
+ rc = -EIO;
+
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ if (rc == 0)
+ sdev->sdev_gendev.power.power_state = mesg;
+ return rc;
+}
+
+/**
+ * ata_scsi_device_resume - resume ATA device associated with sdev
+ * @sdev: the SCSI device to resume
+ *
+ * Request resume EH action on the ATA device associated with
+ * @sdev and return immediately. This enables parallel
+ * wakeup/spinup of devices.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ *
+ * RETURNS:
+ * 0.
+ */
+int ata_scsi_device_resume(struct scsi_device *sdev)
+{
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
+ struct ata_eh_info *ehi = &ap->eh_info;
+ unsigned long flags;
+ unsigned int action;
+
+ if (!dev)
+ goto out;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ /* if @sdev is already detached, nothing to do */
+ if (sdev->sdev_state == SDEV_OFFLINE ||
+ sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
+ goto out_unlock;
+
+ /* request resume */
+ action = ATA_EH_RESUME;
+ if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
+ __ata_ehi_hotplugged(ehi);
+ else
+ action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
+ ehi->dev_action[dev->devno] |= action;
+
+ /* We don't want autopsy and verbose EH messages. Disable
+ * those if we're the only device on this link.
+ */
+ if (ata_port_max_devices(ap) == 1)
+ ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
+
+ ata_port_schedule_eh(ap);
+
+ out_unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ out:
+ sdev->sdev_gendev.power.power_state = PMSG_ON;
+ return 0;
+}
+
+/**
+ * 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)
+ */
+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 Address mark not found for data field
+ /* TRK0 */
+ {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
+ /* Abort & !ICRC */
+ {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
+ /* Media change request */
+ {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
+ /* SRV */
+ {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
+ /* Media change */
+ {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
+ /* ECC */
+ {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error 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
+ {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
+ {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;
+ }
+ }
+ /* No immediate match */
+ if (verbose)
+ printk(KERN_WARNING "ata%u: no sense translation for "
+ "error 0x%02x\n", id, drv_err);
+ }
+
+ /* Fall back to interpreting status bits */
+ 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;
+ }
+ }
+ /* No error? Undecoded? */
+ if (verbose)
+ printk(KERN_WARNING "ata%u: no sense translation for "
+ "status: 0x%02x\n", id, drv_stat);
+
+ /* 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)
+ printk(KERN_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. Clear sense key, ASC & ASCQ if there is no error.
+ *
+ * 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;
+
+ memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+ cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+ /*
+ * Use ata_to_sense_error() to map status register bits
+ * onto sense key, asc & ascq.
+ */
+ if (qc->err_mask ||
+ tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+ ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+ &sb[1], &sb[2], &sb[3], verbose);
+ sb[1] &= 0x0f;
+ }
+
+ /*
+ * Sense data is current and format is descriptor.
+ */
+ sb[0] = 0x72;
+
+ desc[0] = 0x09;
+
+ /* set length of additional sense data */
+ sb[7] = 14;
+ desc[1] = 12;
+
+ /*
+ * Copy registers into sense buffer.
+ */
+ desc[2] = 0x00;
+ desc[3] = tf->feature; /* == error reg */
+ desc[5] = tf->nsect;
+ desc[7] = tf->lbal;
+ desc[9] = tf->lbam;
+ desc[11] = tf->lbah;
+ desc[12] = tf->device;
+ desc[13] = tf->command; /* == status reg */
+
+ /*
+ * Fill in Extend bit, and the high order bytes
+ * if applicable.
+ */
+ if (tf->flags & ATA_TFLAG_LBA48) {
+ desc[2] |= 0x01;
+ desc[4] = tf->hob_nsect;
+ desc[6] = tf->hob_lbal;
+ desc[8] = tf->hob_lbam;
+ desc[10] = tf->hob_lbah;
+ }
+}
+
+/**
+ * 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 accomodate 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;
+ unsigned char *desc = sb + 8;
+ int verbose = qc->ap->ops->error_handler == NULL;
+ u64 block;
+
+ memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
+
+ cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+ /* sense data is current and format is descriptor */
+ sb[0] = 0x72;
+
+ /* Use ata_to_sense_error() to map status register bits
+ * onto sense key, asc & ascq.
+ */
+ if (qc->err_mask ||
+ tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
+ ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
+ &sb[1], &sb[2], &sb[3], verbose);
+ sb[1] &= 0x0f;
+ }
+
+ block = ata_tf_read_block(&qc->result_tf, dev);
+
+ /* information sense data descriptor */
+ sb[7] = 12;
+ desc[0] = 0x00;
+ desc[1] = 10;
+
+ desc[2] |= 0x80; /* valid */
+ desc[6] = block >> 40;
+ desc[7] = block >> 32;
+ desc[8] = block >> 24;
+ desc[9] = block >> 16;
+ desc[10] = block >> 8;
+ desc[11] = block;
+}
+
+static void ata_scsi_sdev_config(struct scsi_device *sdev)
+{
+ sdev->use_10_for_rw = 1;
+ sdev->use_10_for_ms = 1;
+}
+
+static void ata_scsi_dev_config(struct scsi_device *sdev,
+ struct ata_device *dev)
+{
+ /* configure max sectors */
+ blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
+
+ /* SATA DMA transfers must be multiples of 4 byte, so
+ * we need to pad ATAPI transfers using an extra sg.
+ * Decrement max hw segments accordingly.
+ */
+ if (dev->class == ATA_DEV_ATAPI) {
+ request_queue_t *q = sdev->request_queue;
+ blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
+ }
+
+ if (dev->flags & ATA_DFLAG_NCQ) {
+ int depth;
+
+ depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+ depth = min(ATA_MAX_QUEUE - 1, depth);
+ scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
+ }
+}
+
+/**
+ * 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);
+
+ ata_scsi_sdev_config(sdev);
+
+ blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
+
+ if (dev)
+ ata_scsi_dev_config(sdev, dev);
+
+ return 0; /* scsi layer doesn't check return value, sigh */
+}
+
+/**
+ * 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);
+}
+
+/**
+ * ata_scsi_change_queue_depth - SCSI callback for queue depth config
+ * @sdev: SCSI device to configure queue depth for
+ * @queue_depth: new queue depth
+ *
+ * This is libata standard hostt->change_queue_depth callback.
+ * SCSI will call into this callback when user tries to set queue
+ * depth via sysfs.
+ *
+ * LOCKING:
+ * SCSI layer (we don't care)
+ *
+ * RETURNS:
+ * Newly configured queue depth.
+ */
+int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
+{
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct ata_device *dev;
+ unsigned long flags;
+ int max_depth;
+
+ if (queue_depth < 1)
+ return sdev->queue_depth;
+
+ dev = ata_scsi_find_dev(ap, sdev);
+ if (!dev || !ata_dev_enabled(dev))
+ return sdev->queue_depth;
+
+ max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
+ max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
+ if (queue_depth > max_depth)
+ queue_depth = max_depth;
+
+ scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
+
+ spin_lock_irqsave(ap->lock, flags);
+ if (queue_depth > 1)
+ dev->flags &= ~ATA_DFLAG_NCQ_OFF;
+ else
+ dev->flags |= ATA_DFLAG_NCQ_OFF;
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ return queue_depth;
+}
+
+/**
+ * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
+ * @qc: Storage for translated ATA taskfile
+ *
+ * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
+ * (to start). Perhaps these commands should be preceded by
+ * CHECK POWER MODE to see what power mode the device is already in.
+ * [See SAT revision 5 at www.t10.org]
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ struct ata_taskfile *tf = &qc->tf;
+ const u8 *cdb = scmd->cmnd;
+
+ if (scmd->cmd_len < 5)
+ 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)
+ goto invalid_fld; /* LOEJ bit set not supported */
+ if (((cdb[4] >> 4) & 0xf) != 0)
+ 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
+ /* 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_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ /* "Invalid field in cbd" */
+ 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;
+
+ 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 = 0;
+
+ VPRINTK("six-byte command\n");
+
+ lba |= ((u64)cdb[2]) << 8;
+ lba |= ((u64)cdb[3]);
+
+ len |= ((u32)cdb[4]);
+
+ *plba = lba;
+ *plen = len;
+}
+
+/**
+ * scsi_10_lba_len - Get LBA and transfer length
+ * @cdb: SCSI command to translate
+ *
+ * Calculate LBA and transfer length for 10-byte commands.
+ *
+ * RETURNS:
+ * @plba: the LBA
+ * @plen: the transfer length
+ */
+static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
+{
+ u64 lba = 0;
+ u32 len = 0;
+
+ VPRINTK("ten-byte command\n");
+
+ lba |= ((u64)cdb[2]) << 24;
+ lba |= ((u64)cdb[3]) << 16;
+ lba |= ((u64)cdb[4]) << 8;
+ lba |= ((u64)cdb[5]);
+
+ len |= ((u32)cdb[7]) << 8;
+ len |= ((u32)cdb[8]);
+
+ *plba = lba;
+ *plen = len;
+}
+
+/**
+ * scsi_16_lba_len - Get LBA and transfer length
+ * @cdb: SCSI command to translate
+ *
+ * Calculate LBA and transfer length for 16-byte commands.
+ *
+ * RETURNS:
+ * @plba: the LBA
+ * @plen: the transfer length
+ */
+static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
+{
+ u64 lba = 0;
+ u32 len = 0;
+
+ VPRINTK("sixteen-byte command\n");
+
+ lba |= ((u64)cdb[2]) << 56;
+ lba |= ((u64)cdb[3]) << 48;
+ lba |= ((u64)cdb[4]) << 40;
+ lba |= ((u64)cdb[5]) << 32;
+ lba |= ((u64)cdb[6]) << 24;
+ lba |= ((u64)cdb[7]) << 16;
+ lba |= ((u64)cdb[8]) << 8;
+ lba |= ((u64)cdb[9]);
+
+ len |= ((u32)cdb[10]) << 24;
+ len |= ((u32)cdb[11]) << 16;
+ len |= ((u32)cdb[12]) << 8;
+ len |= ((u32)cdb[13]);
+
+ *plba = lba;
+ *plen = len;
+}
+
+/**
+ * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
+ * @qc: Storage for translated ATA taskfile
+ *
+ * Converts SCSI VERIFY command to an ATA READ VERIFY command.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Zero on success, non-zero on error.
+ */
+static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ struct ata_taskfile *tf = &qc->tf;
+ struct ata_device *dev = qc->dev;
+ u64 dev_sectors = qc->dev->n_sectors;
+ const u8 *cdb = scmd->cmnd;
+ u64 block;
+ u32 n_block;
+
+ tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf->protocol = ATA_PROT_NODATA;
+
+ if (cdb[0] == VERIFY) {
+ if (scmd->cmd_len < 10)
+ goto invalid_fld;
+ scsi_10_lba_len(cdb, &block, &n_block);
+ } else if (cdb[0] == VERIFY_16) {
+ if (scmd->cmd_len < 16)
+ goto invalid_fld;
+ scsi_16_lba_len(cdb, &block, &n_block);
+ } else
+ goto invalid_fld;
+
+ if (!n_block)
+ goto nothing_to_do;
+ if (block >= dev_sectors)
+ goto out_of_range;
+ if ((block + n_block) > dev_sectors)
+ goto out_of_range;
+
+ if (dev->flags & ATA_DFLAG_LBA) {
+ tf->flags |= ATA_TFLAG_LBA;
+
+ if (lba_28_ok(block, n_block)) {
+ /* use LBA28 */
+ tf->command = ATA_CMD_VERIFY;
+ tf->device |= (block >> 24) & 0xf;
+ } else if (lba_48_ok(block, n_block)) {
+ if (!(dev->flags & ATA_DFLAG_LBA48))
+ goto out_of_range;
+
+ /* use LBA48 */
+ tf->flags |= ATA_TFLAG_LBA48;
+ tf->command = ATA_CMD_VERIFY_EXT;
+
+ tf->hob_nsect = (n_block >> 8) & 0xff;
+
+ tf->hob_lbah = (block >> 40) & 0xff;
+ tf->hob_lbam = (block >> 32) & 0xff;
+ tf->hob_lbal = (block >> 24) & 0xff;
+ } else
+ /* request too large even for LBA48 */
+ goto out_of_range;
+
+ tf->nsect = n_block & 0xff;
+
+ tf->lbah = (block >> 16) & 0xff;
+ tf->lbam = (block >> 8) & 0xff;
+ tf->lbal = block & 0xff;
+
+ tf->device |= ATA_LBA;
+ } else {
+ /* CHS */
+ u32 sect, head, cyl, track;
+
+ if (!lba_28_ok(block, n_block))
+ goto out_of_range;
+
+ /* Convert LBA to CHS */
+ track = (u32)block / dev->sectors;
+ cyl = track / dev->heads;
+ head = track % dev->heads;
+ sect = (u32)block % dev->sectors + 1;
+
+ DPRINTK("block %u track %u cyl %u head %u sect %u\n",
+ (u32)block, track, cyl, head, sect);
+
+ /* Check whether the converted CHS can fit.
+ Cylinder: 0-65535
+ Head: 0-15
+ Sector: 1-255*/
+ if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
+ goto out_of_range;
+
+ tf->command = ATA_CMD_VERIFY;
+ tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
+ tf->lbal = sect;
+ tf->lbam = cyl;
+ tf->lbah = cyl >> 8;
+ tf->device |= head;
+ }
+
+ return 0;
+
+invalid_fld:
+ ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ /* "Invalid field in cbd" */
+ return 1;
+
+out_of_range:
+ ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
+ /* "Logical Block Address out of range" */
+ return 1;
+
+nothing_to_do:
+ scmd->result = SAM_STAT_GOOD;
+ return 1;
+}
+
+/**
+ * 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;
+ unsigned int tf_flags = 0;
+ u64 block;
+ u32 n_block;
+ int rc;
+
+ if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
+ tf_flags |= ATA_TFLAG_WRITE;
+
+ /* Calculate the SCSI LBA, transfer length and FUA. */
+ switch (cdb[0]) {
+ case READ_10:
+ case WRITE_10:
+ if (unlikely(scmd->cmd_len < 10))
+ goto invalid_fld;
+ scsi_10_lba_len(cdb, &block, &n_block);
+ if (unlikely(cdb[1] & (1 << 3)))
+ tf_flags |= ATA_TFLAG_FUA;
+ break;
+ case READ_6:
+ case WRITE_6:
+ if (unlikely(scmd->cmd_len < 6))
+ 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;
+ break;
+ case READ_16:
+ case WRITE_16:
+ if (unlikely(scmd->cmd_len < 16))
+ goto invalid_fld;
+ scsi_16_lba_len(cdb, &block, &n_block);
+ if (unlikely(cdb[1] & (1 << 3)))
+ tf_flags |= ATA_TFLAG_FUA;
+ break;
+ default:
+ DPRINTK("no-byte command\n");
+ 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->nsect = n_block;
+
+ rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
+ qc->tag);
+ 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_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ /* "Invalid field in cbd" */
+ return 1;
+
+out_of_range:
+ ata_scsi_set_sense(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_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);
+
+ /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
+ * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
+ * cache
+ */
+ if (ap->ops->error_handler &&
+ !need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
+ ((qc->tf.feature == SETFEATURES_WC_ON) ||
+ (qc->tf.feature == SETFEATURES_WC_OFF))) {
+ ap->eh_info.action |= ATA_EH_REVALIDATE;
+ ata_port_schedule_eh(ap);
+ }
+
+ /* 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, a check condition
+ * is generated and the ATA register values are returned
+ * whether the command completed successfully or not. If there
+ * was no error, SK, ASC and ASCQ will all be zero.
+ */
+ if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
+ ((cdb[2] & 0x20) || need_sense)) {
+ ata_gen_passthru_sense(qc);
+ } else {
+ if (!need_sense) {
+ cmd->result = SAM_STAT_GOOD;
+ } else {
+ /* TODO: decide which descriptor format to use
+ * for 48b LBA devices and call that here
+ * instead of the fixed desc, which is only
+ * good for smaller LBA (and maybe CHS?)
+ * devices.
+ */
+ ata_gen_ata_sense(qc);
+ }
+ }
+
+ if (need_sense && !ap->ops->error_handler)
+ ata_dump_status(ap->id, &qc->result_tf);
+
+ qc->scsidone(cmd);
+
+ ata_qc_free(qc);
+}
+
+/**
+ * ata_scmd_need_defer - Check whether we need to defer scmd
+ * @dev: ATA device to which the command is addressed
+ * @is_io: Is the command IO (and thus possibly NCQ)?
+ *
+ * NCQ and non-NCQ commands cannot run together. As upper layer
+ * only knows the queue depth, we are responsible for maintaining
+ * exclusion. This function checks whether a new command can be
+ * issued to @dev.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * 1 if deferring is needed, 0 otherwise.
+ */
+static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
+{
+ struct ata_port *ap = dev->ap;
+
+ if (!(dev->flags & ATA_DFLAG_NCQ))
+ return 0;
+
+ if (is_io) {
+ if (!ata_tag_valid(ap->active_tag))
+ return 0;
+ } else {
+ if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
+ return 0;
+ }
+ return 1;
+}
+
+/**
+ * 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
+ * @done: SCSI command completion function
+ * @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,
+ void (*done)(struct scsi_cmnd *),
+ ata_xlat_func_t xlat_func)
+{
+ struct ata_queued_cmd *qc;
+ int is_io = xlat_func == ata_scsi_rw_xlat;
+
+ VPRINTK("ENTER\n");
+
+ if (unlikely(ata_scmd_need_defer(dev, is_io)))
+ goto defer;
+
+ qc = ata_scsi_qc_new(dev, cmd, done);
+ 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(cmd->request_bufflen < 1)) {
+ ata_dev_printk(dev, KERN_WARNING,
+ "WARNING: zero len r/w req\n");
+ goto err_did;
+ }
+
+ if (cmd->use_sg)
+ ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
+ else
+ ata_sg_init_one(qc, cmd->request_buffer,
+ cmd->request_bufflen);
+
+ qc->dma_dir = cmd->sc_data_direction;
+ }
+
+ qc->complete_fn = ata_scsi_qc_complete;
+
+ if (xlat_func(qc))
+ goto early_finish;
+
+ /* select device, send command to hardware */
+ ata_qc_issue(qc);
+
+ VPRINTK("EXIT\n");
+ return 0;
+
+early_finish:
+ ata_qc_free(qc);
+ done(cmd);
+ DPRINTK("EXIT - early finish (good or error)\n");
+ return 0;
+
+err_did:
+ ata_qc_free(qc);
+ cmd->result = (DID_ERROR << 16);
+ done(cmd);
+err_mem:
+ DPRINTK("EXIT - internal\n");
+ return 0;
+
+defer:
+ DPRINTK("EXIT - defer\n");
+ return SCSI_MLQUEUE_DEVICE_BUSY;
+}
+
+/**
+ * ata_scsi_rbuf_get - Map response buffer.
+ * @cmd: SCSI command containing buffer to be mapped.
+ * @buf_out: Pointer to mapped area.
+ *
+ * Maps buffer contained within SCSI command @cmd.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Length of response buffer.
+ */
+
+static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
+{
+ u8 *buf;
+ unsigned int buflen;
+
+ if (cmd->use_sg) {
+ struct scatterlist *sg;
+
+ sg = (struct scatterlist *) cmd->request_buffer;
+ buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
+ buflen = sg->length;
+ } else {
+ buf = cmd->request_buffer;
+ buflen = cmd->request_bufflen;
+ }
+
+ *buf_out = buf;
+ return buflen;
+}
+
+/**
+ * ata_scsi_rbuf_put - Unmap response buffer.
+ * @cmd: SCSI command containing buffer to be unmapped.
+ * @buf: buffer to unmap
+ *
+ * Unmaps response buffer contained within @cmd.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
+{
+ if (cmd->use_sg) {
+ struct scatterlist *sg;
+
+ sg = (struct scatterlist *) cmd->request_buffer;
+ kunmap_atomic(buf - sg->offset, KM_IRQ0);
+ }
+}
+
+/**
+ * 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)
+ */
+
+void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
+ unsigned int (*actor) (struct ata_scsi_args *args,
+ u8 *rbuf, unsigned int buflen))
+{
+ u8 *rbuf;
+ unsigned int buflen, rc;
+ struct scsi_cmnd *cmd = args->cmd;
+
+ buflen = ata_scsi_rbuf_get(cmd, &rbuf);
+ memset(rbuf, 0, buflen);
+ rc = actor(args, rbuf, buflen);
+ ata_scsi_rbuf_put(cmd, rbuf);
+
+ if (rc == 0)
+ cmd->result = SAM_STAT_GOOD;
+ args->done(cmd);
+}
+
+/**
+ * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
+ * @idx: byte index into SCSI response buffer
+ * @val: value to set
+ *
+ * To be used by SCSI command simulator functions. This macros
+ * expects two local variables, u8 *rbuf and unsigned int buflen,
+ * are in scope.
+ *
+ * LOCKING:
+ * None.
+ */
+#define ATA_SCSI_RBUF_SET(idx, val) do { \
+ if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
+ } while (0)
+
+/**
+ * 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.
+ * @buflen: Response buffer length.
+ *
+ * Returns standard device identification data associated
+ * with non-VPD INQUIRY command output.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ u8 hdr[] = {
+ TYPE_DISK,
+ 0,
+ 0x5, /* claim SPC-3 version compatibility */
+ 2,
+ 95 - 4
+ };
+
+ /* set scsi removeable (RMB) bit per ata bit */
+ if (ata_id_removeable(args->id))
+ hdr[1] |= (1 << 7);
+
+ VPRINTK("ENTER\n");
+
+ memcpy(rbuf, hdr, sizeof(hdr));
+
+ if (buflen > 35) {
+ memcpy(&rbuf[8], "ATA ", 8);
+ ata_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
+ ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
+ if (rbuf[32] == 0 || rbuf[32] == ' ')
+ memcpy(&rbuf[32], "n/a ", 4);
+ }
+
+ if (buflen > 63) {
+ const u8 versions[] = {
+ 0x60, /* SAM-3 (no version claimed) */
+
+ 0x03,
+ 0x20, /* SBC-2 (no version claimed) */
+
+ 0x02,
+ 0x60 /* SPC-3 (no version claimed) */
+ };
+
+ memcpy(rbuf + 59, 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.
+ * @buflen: Response buffer length.
+ *
+ * Returns list of inquiry VPD pages available.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ const u8 pages[] = {
+ 0x00, /* page 0x00, this page */
+ 0x80, /* page 0x80, unit serial no page */
+ 0x83 /* page 0x83, device ident page */
+ };
+ rbuf[3] = sizeof(pages); /* number of supported VPD pages */
+
+ if (buflen > 6)
+ memcpy(rbuf + 4, pages, sizeof(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.
+ * @buflen: Response buffer length.
+ *
+ * Returns ATA device serial number.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ const u8 hdr[] = {
+ 0,
+ 0x80, /* this page code */
+ 0,
+ ATA_SERNO_LEN, /* page len */
+ };
+ memcpy(rbuf, hdr, sizeof(hdr));
+
+ if (buflen > (ATA_SERNO_LEN + 4 - 1))
+ ata_id_string(args->id, (unsigned char *) &rbuf[4],
+ ATA_ID_SERNO_OFS, ATA_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.
+ * @buflen: Response buffer length.
+ *
+ * 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)
+ */
+
+unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ int num;
+ const int sat_model_serial_desc_len = 68;
+ const int ata_model_byte_len = 40;
+
+ rbuf[1] = 0x83; /* this page code */
+ num = 4;
+
+ if (buflen > (ATA_SERNO_LEN + num + 3)) {
+ /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
+ rbuf[num + 0] = 2;
+ rbuf[num + 3] = ATA_SERNO_LEN;
+ num += 4;
+ ata_id_string(args->id, (unsigned char *) rbuf + num,
+ ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
+ num += ATA_SERNO_LEN;
+ }
+ if (buflen > (sat_model_serial_desc_len + num + 3)) {
+ /* 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_OFS, ata_model_byte_len);
+ num += ata_model_byte_len;
+ ata_id_string(args->id, (unsigned char *) rbuf + num,
+ ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
+ num += ATA_SERNO_LEN;
+ }
+ rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
+ return 0;
+}
+
+/**
+ * ata_scsiop_noop - Command handler that simply returns success.
+ * @args: device IDENTIFY data / SCSI command of interest.
+ * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
+ * @buflen: Response buffer length.
+ *
+ * No operation. Simply returns success to caller, to indicate
+ * that the caller should successfully complete this SCSI command.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ VPRINTK("ENTER\n");
+ return 0;
+}
+
+/**
+ * ata_msense_push - Push data onto MODE SENSE data output buffer
+ * @ptr_io: (input/output) Location to store more output data
+ * @last: End of output data buffer
+ * @buf: Pointer to BLOB being added to output buffer
+ * @buflen: Length of BLOB
+ *
+ * Store MODE SENSE data on an output buffer.
+ *
+ * LOCKING:
+ * None.
+ */
+
+static void ata_msense_push(u8 **ptr_io, const u8 *last,
+ const u8 *buf, unsigned int buflen)
+{
+ u8 *ptr = *ptr_io;
+
+ if ((ptr + buflen - 1) > last)
+ return;
+
+ memcpy(ptr, buf, buflen);
+
+ ptr += buflen;
+
+ *ptr_io = ptr;
+}
+
+/**
+ * ata_msense_caching - Simulate MODE SENSE caching info page
+ * @id: device IDENTIFY data
+ * @ptr_io: (input/output) Location to store more output data
+ * @last: End of output data buffer
+ *
+ * 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 **ptr_io,
+ const u8 *last)
+{
+ u8 page[CACHE_MPAGE_LEN];
+
+ memcpy(page, def_cache_mpage, sizeof(page));
+ if (ata_id_wcache_enabled(id))
+ page[2] |= (1 << 2); /* write cache enable */
+ if (!ata_id_rahead_enabled(id))
+ page[12] |= (1 << 5); /* disable read ahead */
+
+ ata_msense_push(ptr_io, last, page, sizeof(page));
+ return sizeof(page);
+}
+
+/**
+ * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
+ * @dev: Device associated with this MODE SENSE command
+ * @ptr_io: (input/output) Location to store more output data
+ * @last: End of output data buffer
+ *
+ * Generate a generic MODE SENSE control mode page.
+ *
+ * LOCKING:
+ * None.
+ */
+
+static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
+{
+ ata_msense_push(ptr_io, last, def_control_mpage,
+ sizeof(def_control_mpage));
+ return sizeof(def_control_mpage);
+}
+
+/**
+ * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
+ * @dev: Device associated with this MODE SENSE command
+ * @ptr_io: (input/output) Location to store more output data
+ * @last: End of output data buffer
+ *
+ * Generate a generic MODE SENSE r/w error recovery page.
+ *
+ * LOCKING:
+ * None.
+ */
+
+static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
+{
+
+ ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
+ sizeof(def_rw_recovery_mpage));
+ 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[41], fw[9];
+
+ if (!libata_fua)
+ return 0;
+ if (!ata_id_has_fua(id))
+ return 0;
+
+ ata_id_c_string(id, model, ATA_ID_PROD_OFS, sizeof(model));
+ ata_id_c_string(id, fw, ATA_ID_FW_REV_OFS, 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.
+ * @buflen: Response buffer length.
+ *
+ * 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)
+ */
+
+unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ struct ata_device *dev = args->dev;
+ u8 *scsicmd = args->cmd->cmnd, *p, *last;
+ 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, output_len, alloc_len, minlen;
+ u8 dpofua;
+
+ VPRINTK("ENTER\n");
+
+ six_byte = (scsicmd[0] == MODE_SENSE);
+ ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
+ /*
+ * LLBA bit in msense(10) ignored (compliant)
+ */
+
+ page_control = scsicmd[2] >> 6;
+ switch (page_control) {
+ case 0: /* current */
+ break; /* supported */
+ case 3: /* saved */
+ goto saving_not_supp;
+ case 1: /* changeable */
+ case 2: /* defaults */
+ default:
+ goto invalid_fld;
+ }
+
+ if (six_byte) {
+ output_len = 4 + (ebd ? 8 : 0);
+ alloc_len = scsicmd[4];
+ } else {
+ output_len = 8 + (ebd ? 8 : 0);
+ alloc_len = (scsicmd[7] << 8) + scsicmd[8];
+ }
+ minlen = (alloc_len < buflen) ? alloc_len : buflen;
+
+ p = rbuf + output_len;
+ last = rbuf + minlen - 1;
+
+ 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))
+ goto invalid_fld;
+
+ switch(pg) {
+ case RW_RECOVERY_MPAGE:
+ output_len += ata_msense_rw_recovery(&p, last);
+ break;
+
+ case CACHE_MPAGE:
+ output_len += ata_msense_caching(args->id, &p, last);
+ break;
+
+ case CONTROL_MPAGE: {
+ output_len += ata_msense_ctl_mode(&p, last);
+ break;
+ }
+
+ case ALL_MPAGES:
+ output_len += ata_msense_rw_recovery(&p, last);
+ output_len += ata_msense_caching(args->id, &p, last);
+ output_len += ata_msense_ctl_mode(&p, last);
+ break;
+
+ default: /* invalid page code */
+ goto invalid_fld;
+ }
+
+ if (minlen < 1)
+ return 0;
+
+ 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) {
+ output_len--;
+ rbuf[0] = output_len;
+ if (minlen > 2)
+ rbuf[2] |= dpofua;
+ if (ebd) {
+ if (minlen > 3)
+ rbuf[3] = sizeof(sat_blk_desc);
+ if (minlen > 11)
+ memcpy(rbuf + 4, sat_blk_desc,
+ sizeof(sat_blk_desc));
+ }
+ } else {
+ output_len -= 2;
+ rbuf[0] = output_len >> 8;
+ if (minlen > 1)
+ rbuf[1] = output_len;
+ if (minlen > 3)
+ rbuf[3] |= dpofua;
+ if (ebd) {
+ if (minlen > 7)
+ rbuf[7] = sizeof(sat_blk_desc);
+ if (minlen > 15)
+ memcpy(rbuf + 8, sat_blk_desc,
+ sizeof(sat_blk_desc));
+ }
+ }
+ return 0;
+
+invalid_fld:
+ ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
+ /* "Invalid field in cbd" */
+ return 1;
+
+saving_not_supp:
+ ata_scsi_set_sense(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.
+ * @buflen: Response buffer length.
+ *
+ * Simulate READ CAPACITY commands.
+ *
+ * LOCKING:
+ * None.
+ */
+unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
+
+ VPRINTK("ENTER\n");
+
+ if (args->cmd->cmnd[0] == READ_CAPACITY) {
+ if (last_lba >= 0xffffffffULL)
+ last_lba = 0xffffffff;
+
+ /* sector count, 32-bit */
+ ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
+ ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
+ ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
+ ATA_SCSI_RBUF_SET(3, last_lba);
+
+ /* sector size */
+ ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
+ ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE);
+ } else {
+ /* sector count, 64-bit */
+ ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
+ ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
+ ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
+ ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
+ ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
+ ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
+ ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
+ ATA_SCSI_RBUF_SET(7, last_lba);
+
+ /* sector size */
+ ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
+ ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE);
+ }
+
+ 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.
+ * @buflen: Response buffer length.
+ *
+ * Simulate REPORT LUNS command.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
+ unsigned int buflen)
+{
+ VPRINTK("ENTER\n");
+ rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
+
+ return 0;
+}
+
+/**
+ * ata_scsi_set_sense - Set SCSI sense data and status
+ * @cmd: SCSI request to be handled
+ * @sk: SCSI-defined sense key
+ * @asc: SCSI-defined additional sense code
+ * @ascq: SCSI-defined additional sense code qualifier
+ *
+ * Helper function that builds a valid fixed format, current
+ * response code and the given sense key (sk), additional sense
+ * code (asc) and additional sense code qualifier (ascq) with
+ * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
+ * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
+ *
+ * LOCKING:
+ * Not required
+ */
+
+void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
+{
+ cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+ cmd->sense_buffer[0] = 0x70; /* fixed format, current */
+ cmd->sense_buffer[2] = sk;
+ cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
+ cmd->sense_buffer[12] = asc;
+ cmd->sense_buffer[13] = ascq;
+}
+
+/**
+ * ata_scsi_badcmd - End a SCSI request with an error
+ * @cmd: SCSI request to be handled
+ * @done: SCSI command completion function
+ * @asc: SCSI-defined additional sense code
+ * @ascq: SCSI-defined additional sense code qualifier
+ *
+ * Helper function that completes a SCSI command with
+ * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
+ * and the specified additional sense codes.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ */
+
+void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
+{
+ DPRINTK("ENTER\n");
+ ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
+
+ done(cmd);
+}
+
+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);
+ }
+
+ qc->scsidone(qc->scsicmd);
+ ata_qc_free(qc);
+}
+
+/* is it pointless to prefer PIO for "safety reasons"? */
+static inline int ata_pio_use_silly(struct ata_port *ap)
+{
+ return (ap->flags & ATA_FLAG_PIO_DMA);
+}
+
+static void atapi_request_sense(struct ata_queued_cmd *qc)
+{
+ struct ata_port *ap = qc->ap;
+ struct scsi_cmnd *cmd = qc->scsicmd;
+
+ DPRINTK("ATAPI request sense\n");
+
+ /* FIXME: is this needed? */
+ memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
+
+ ap->ops->tf_read(ap, &qc->tf);
+
+ /* fill these in, for the case where they are -not- overwritten */
+ cmd->sense_buffer[0] = 0x70;
+ cmd->sense_buffer[2] = qc->tf.feature >> 4;
+
+ ata_qc_reinit(qc);
+
+ ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
+ 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 = ATA_PROT_ATAPI_DMA;
+ qc->tf.feature |= ATAPI_PKT_DMA;
+ } else {
+ qc->tf.protocol = ATA_PROT_ATAPI;
+ qc->tf.lbam = (8 * 1024) & 0xff;
+ qc->tf.lbah = (8 * 1024) >> 8;
+ }
+ qc->nbytes = SCSI_SENSE_BUFFERSIZE;
+
+ qc->complete_fn = atapi_sense_complete;
+
+ ata_qc_issue(qc);
+
+ DPRINTK("EXIT\n");
+}
+
+static void atapi_qc_complete(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *cmd = qc->scsicmd;
+ unsigned int err_mask = qc->err_mask;
+
+ VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
+
+ /* handle completion from new EH */
+ if (unlikely(qc->ap->ops->error_handler &&
+ (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
+
+ if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
+ /* FIXME: not quite right; we don't want the
+ * translation of taskfile registers into a
+ * sense descriptors, since that's only
+ * correct for ATA, not ATAPI
+ */
+ ata_gen_passthru_sense(qc);
+ }
+
+ /* SCSI EH automatically locks door if sdev->locked is
+ * set. Sometimes door lock request continues to
+ * fail, for example, when no media is present. This
+ * creates a loop - SCSI EH issues door lock which
+ * fails and gets invoked again to acquire sense data
+ * for the failed command.
+ *
+ * If door lock fails, always clear sdev->locked to
+ * avoid this infinite loop.
+ */
+ if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
+ qc->dev->sdev->locked = 0;
+
+ qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
+ qc->scsidone(cmd);
+ ata_qc_free(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 {
+ u8 *scsicmd = cmd->cmnd;
+
+ if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
+ u8 *buf = NULL;
+ unsigned int buflen;
+
+ buflen = ata_scsi_rbuf_get(cmd, &buf);
+
+ /* 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.
+ */
+ if (buf[2] == 0) {
+ buf[2] = 0x5;
+ buf[3] = 0x32;
+ }
+
+ ata_scsi_rbuf_put(cmd, buf);
+ }
+
+ cmd->result = SAM_STAT_GOOD;
+ }
+
+ qc->scsidone(cmd);
+ ata_qc_free(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 using_pio = (dev->flags & ATA_DFLAG_PIO);
+ int nodata = (scmd->sc_data_direction == DMA_NONE);
+
+ if (!using_pio)
+ /* Check whether ATAPI DMA is safe */
+ if (ata_check_atapi_dma(qc))
+ using_pio = 1;
+
+ memset(qc->cdb, 0, dev->cdb_len);
+ memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
+
+ qc->complete_fn = atapi_qc_complete;
+
+ qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ if (scmd->sc_data_direction == DMA_TO_DEVICE) {
+ qc->tf.flags |= ATA_TFLAG_WRITE;
+ DPRINTK("direction: write\n");
+ }
+
+ qc->tf.command = ATA_CMD_PACKET;
+
+ /* no data, or PIO data xfer */
+ if (using_pio || nodata) {
+ if (nodata)
+ qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
+ else
+ qc->tf.protocol = ATA_PROT_ATAPI;
+ qc->tf.lbam = (8 * 1024) & 0xff;
+ qc->tf.lbah = (8 * 1024) >> 8;
+ }
+
+ /* DMA data xfer */
+ else {
+ qc->tf.protocol = ATA_PROT_ATAPI_DMA;
+ qc->tf.feature |= ATAPI_PKT_DMA;
+
+ if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
+ /* some SATA bridges need us to indicate data xfer direction */
+ qc->tf.feature |= ATAPI_DMADIR;
+ }
+
+ qc->nbytes = scmd->request_bufflen;
+
+ return 0;
+}
+
+static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
+{
+ if (likely(id < ATA_MAX_DEVICES))
+ return &ap->device[id];
+ return NULL;
+}
+
+static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
+ const struct scsi_device *scsidev)
+{
+ /* skip commands not addressed to targets we simulate */
+ if (unlikely(scsidev->channel || scsidev->lun))
+ return NULL;
+
+ return ata_find_dev(ap, scsidev->id);
+}
+
+/**
+ * ata_scsi_dev_enabled - determine if device is enabled
+ * @dev: ATA device
+ *
+ * Determine if commands should be sent to the specified device.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * 0 if commands are not allowed / 1 if commands are allowed
+ */
+
+static int ata_scsi_dev_enabled(struct ata_device *dev)
+{
+ if (unlikely(!ata_dev_enabled(dev)))
+ return 0;
+
+ if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
+ if (unlikely(dev->class == ATA_DEV_ATAPI)) {
+ ata_dev_printk(dev, KERN_WARNING,
+ "WARNING: ATAPI is %s, device ignored.\n",
+ atapi_enabled ? "not supported with this driver" : "disabled");
+ return 0;
+ }
+ }
+
+ return 1;
+}
+
+/**
+ * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
+ * @ap: ATA port to which the device is attached
+ * @scsidev: SCSI device from which we derive the ATA device
+ *
+ * Given various information provided in struct scsi_cmnd,
+ * map that onto an ATA bus, and using that mapping
+ * determine which ata_device is associated with the
+ * SCSI command to be sent.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host lock)
+ *
+ * RETURNS:
+ * Associated ATA device, or %NULL if not found.
+ */
+static struct ata_device *
+ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
+{
+ struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
+
+ if (unlikely(!dev || !ata_scsi_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 */
+ return ATA_PROT_DMA;
+
+ case 4: /* PIO Data-in */
+ case 5: /* PIO Data-out */
+ return ATA_PROT_PIO;
+
+ case 10: /* Device Reset */
+ case 0: /* Hard Reset */
+ case 1: /* SRST */
+ case 2: /* Bus Idle */
+ case 7: /* Packet */
+ case 8: /* DMA Queued */
+ case 9: /* Device Diagnostic */
+ case 11: /* UDMA Data-in */
+ case 12: /* UDMA Data-Out */
+ case 13: /* FPDMA */
+ 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 or 16-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;
+
+ if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
+ goto invalid_fld;
+
+ /* We may not issue DMA commands if no DMA mode is set */
+ if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
+ goto invalid_fld;
+
+ if (cdb[1] & 0xe0)
+ /* PIO multi not supported yet */
+ goto invalid_fld;
+
+ /*
+ * 12 and 16 byte CDBs use different offsets to
+ * provide the various register values.
+ */
+ if (cdb[0] == ATA_16) {
+ /*
+ * 16-byte CDB - may contain extended commands.
+ *
+ * If that is the case, copy the upper byte register values.
+ */
+ if (cdb[1] & 0x01) {
+ tf->hob_feature = cdb[3];
+ tf->hob_nsect = cdb[5];
+ tf->hob_lbal = cdb[7];
+ tf->hob_lbam = cdb[9];
+ tf->hob_lbah = cdb[11];
+ tf->flags |= ATA_TFLAG_LBA48;
+ } else
+ tf->flags &= ~ATA_TFLAG_LBA48;
+
+ /*
+ * Always copy low byte, device and command registers.
+ */
+ tf->feature = cdb[4];
+ tf->nsect = cdb[6];
+ tf->lbal = cdb[8];
+ tf->lbam = cdb[10];
+ tf->lbah = cdb[12];
+ tf->device = cdb[13];
+ tf->command = cdb[14];
+ } else {
+ /*
+ * 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];
+ }
+ /*
+ * If slave is possible, enforce correct master/slave bit
+ */
+ if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
+ tf->device = qc->dev->devno ?
+ tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
+
+ /*
+ * 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))
+ goto invalid_fld;
+
+ /*
+ * Set flags so that all registers will be written,
+ * and pass on write indication (used for PIO/DMA
+ * setup.)
+ */
+ tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
+
+ if (scmd->sc_data_direction == DMA_TO_DEVICE)
+ tf->flags |= ATA_TFLAG_WRITE;
+
+ /*
+ * Set transfer length.
+ *
+ * TODO: find out if we need to do more here to
+ * cover scatter/gather case.
+ */
+ qc->nsect = scmd->request_bufflen / ATA_SECT_SIZE;
+
+ /* request result TF */
+ qc->flags |= ATA_QCFLAG_RESULT_TF;
+
+ return 0;
+
+ invalid_fld:
+ ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
+ /* "Invalid field in cdb" */
+ 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 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 START_STOP:
+ return ata_scsi_start_stop_xlat;
+ }
+
+ return NULL;
+}
+
+/**
+ * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
+ * @ap: ATA port to which the command was being sent
+ * @cmd: SCSI command to dump
+ *
+ * Prints the contents of a SCSI command via printk().
+ */
+
+static inline void ata_scsi_dump_cdb(struct ata_port *ap,
+ struct scsi_cmnd *cmd)
+{
+#ifdef ATA_DEBUG
+ struct scsi_device *scsidev = cmd->device;
+ u8 *scsicmd = cmd->cmnd;
+
+ DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
+ ap->id,
+ scsidev->channel, scsidev->id, scsidev->lun,
+ scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
+ scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
+ scsicmd[8]);
+#endif
+}
+
+static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
+ void (*done)(struct scsi_cmnd *),
+ struct ata_device *dev)
+{
+ int rc = 0;
+
+ if (unlikely(!scmd->cmd_len)) {
+ ata_dev_printk(dev, KERN_WARNING, "WARNING: zero len CDB\n");
+ scmd->result = DID_ERROR << 16;
+ done(scmd);
+ return 0;
+ }
+
+ if (dev->class == ATA_DEV_ATA) {
+ ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
+ scmd->cmnd[0]);
+
+ if (xlat_func)
+ rc = ata_scsi_translate(dev, scmd, done, xlat_func);
+ else
+ ata_scsi_simulate(dev, scmd, done);
+ } else
+ rc = ata_scsi_translate(dev, scmd, done, atapi_xlat);
+
+ return rc;
+}
+
+/**
+ * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
+ * @cmd: SCSI command to be sent
+ * @done: Completion function, called when command is complete
+ *
+ * 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:
+ * Releases scsi-layer-held lock, and obtains host lock.
+ *
+ * RETURNS:
+ * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ * 0 otherwise.
+ */
+int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+{
+ struct ata_port *ap;
+ struct ata_device *dev;
+ struct scsi_device *scsidev = cmd->device;
+ struct Scsi_Host *shost = scsidev->host;
+ int rc = 0;
+
+ ap = ata_shost_to_port(shost);
+
+ spin_unlock(shost->host_lock);
+ spin_lock(ap->lock);
+
+ ata_scsi_dump_cdb(ap, cmd);
+
+ dev = ata_scsi_find_dev(ap, scsidev);
+ if (likely(dev))
+ rc = __ata_scsi_queuecmd(cmd, done, dev);
+ else {
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ }
+
+ spin_unlock(ap->lock);
+ spin_lock(shost->host_lock);
+ return rc;
+}
+
+/**
+ * ata_scsi_simulate - simulate SCSI command on ATA device
+ * @dev: the target device
+ * @cmd: SCSI command being sent to device.
+ * @done: SCSI command completion function.
+ *
+ * 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,
+ void (*done)(struct scsi_cmnd *))
+{
+ struct ata_scsi_args args;
+ const u8 *scsicmd = cmd->cmnd;
+
+ args.dev = dev;
+ args.id = dev->id;
+ args.cmd = cmd;
+ args.done = done;
+
+ switch(scsicmd[0]) {
+ /* no-op's, complete with success */
+ case SYNCHRONIZE_CACHE:
+ case REZERO_UNIT:
+ case SEEK_6:
+ case SEEK_10:
+ case TEST_UNIT_READY:
+ case FORMAT_UNIT: /* FIXME: correct? */
+ case SEND_DIAGNOSTIC: /* FIXME: correct? */
+ ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
+ break;
+
+ case INQUIRY:
+ if (scsicmd[1] & 2) /* is CmdDt set? */
+ ata_scsi_invalid_field(cmd, done);
+ else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
+ ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
+ else if (scsicmd[2] == 0x00)
+ ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
+ else if (scsicmd[2] == 0x80)
+ ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
+ else if (scsicmd[2] == 0x83)
+ ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
+ else
+ ata_scsi_invalid_field(cmd, done);
+ break;
+
+ case MODE_SENSE:
+ case MODE_SENSE_10:
+ ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
+ break;
+
+ case MODE_SELECT: /* unconditionally return */
+ case MODE_SELECT_10: /* bad-field-in-cdb */
+ ata_scsi_invalid_field(cmd, done);
+ break;
+
+ case READ_CAPACITY:
+ ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+ break;
+
+ case SERVICE_ACTION_IN:
+ if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
+ ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
+ else
+ ata_scsi_invalid_field(cmd, done);
+ break;
+
+ case REPORT_LUNS:
+ ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
+ break;
+
+ /* mandatory commands we haven't implemented yet */
+ case REQUEST_SENSE:
+
+ /* all other commands */
+ default:
+ ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
+ /* "Invalid command operation code" */
+ done(cmd);
+ break;
+ }
+}
+
+void ata_scsi_scan_host(struct ata_port *ap)
+{
+ unsigned int i;
+
+ if (ap->flags & ATA_FLAG_DISABLED)
+ return;
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ struct scsi_device *sdev;
+
+ if (!ata_dev_enabled(dev) || dev->sdev)
+ continue;
+
+ sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL);
+ if (!IS_ERR(sdev)) {
+ dev->sdev = sdev;
+ scsi_device_put(sdev);
+ }
+ }
+}
+
+/**
+ * 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->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_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
+ sdev->sdev_gendev.bus_id);
+
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ }
+}
+
+/**
+ * ata_scsi_hotplug - SCSI part of hotplug
+ * @work: Pointer to ATA port to perform SCSI hotplug on
+ *
+ * Perform SCSI part of hotplug. It's executed from a separate
+ * workqueue after EH completes. This is necessary because SCSI
+ * hot plugging requires working EH and hot unplugging is
+ * synchronized with hot plugging with a mutex.
+ *
+ * LOCKING:
+ * Kernel thread context (may sleep).
+ */
+void ata_scsi_hotplug(struct work_struct *work)
+{
+ struct ata_port *ap =
+ container_of(work, struct ata_port, hotplug_task.work);
+ int i;
+
+ if (ap->pflags & ATA_PFLAG_UNLOADING) {
+ DPRINTK("ENTER/EXIT - unloading\n");
+ return;
+ }
+
+ DPRINTK("ENTER\n");
+
+ /* unplug detached devices */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ 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);
+
+ ata_scsi_remove_dev(dev);
+ }
+
+ /* scan for new ones */
+ ata_scsi_scan_host(ap);
+
+ /* If we scanned while EH was in progress, scan would have
+ * failed silently. Requeue if there are enabled but
+ * unattached devices.
+ */
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ if (ata_dev_enabled(dev) && !dev->sdev) {
+ queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
+ break;
+ }
+ }
+
+ DPRINTK("EXIT\n");
+}
+
+/**
+ * ata_scsi_user_scan - indication for user-initiated bus scan
+ * @shost: SCSI host to scan
+ * @channel: Channel to scan
+ * @id: ID to scan
+ * @lun: LUN to scan
+ *
+ * This function is called when user explicitly requests bus
+ * scan. Set probe pending flag and invoke EH.
+ *
+ * LOCKING:
+ * SCSI layer (we don't care)
+ *
+ * RETURNS:
+ * Zero.
+ */
+static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
+ unsigned int id, unsigned int lun)
+{
+ struct ata_port *ap = ata_shost_to_port(shost);
+ unsigned long flags;
+ int rc = 0;
+
+ if (!ap->ops->error_handler)
+ return -EOPNOTSUPP;
+
+ if ((channel != SCAN_WILD_CARD && channel != 0) ||
+ (lun != SCAN_WILD_CARD && lun != 0))
+ return -EINVAL;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ if (id == SCAN_WILD_CARD) {
+ ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
+ ap->eh_info.action |= ATA_EH_SOFTRESET;
+ } else {
+ struct ata_device *dev = ata_find_dev(ap, id);
+
+ if (dev) {
+ ap->eh_info.probe_mask |= 1 << dev->devno;
+ ap->eh_info.action |= ATA_EH_SOFTRESET;
+ ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
+ } 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. This
+ * function must be executed from ata_aux_wq such that sdev
+ * attach/detach don't race with rescan.
+ *
+ * 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);
+ unsigned long flags;
+ unsigned int i;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ for (i = 0; i < ATA_MAX_DEVICES; i++) {
+ struct ata_device *dev = &ap->device[i];
+ struct scsi_device *sdev = dev->sdev;
+
+ if (!ata_dev_enabled(dev) || !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);
+}
+
+/**
+ * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
+ * @host: ATA host container for all SAS ports
+ * @port_info: Information from low-level host driver
+ * @shost: SCSI host that the scsi device is attached to
+ *
+ * LOCKING:
+ * PCI/etc. bus probe sem.
+ *
+ * RETURNS:
+ * ata_port pointer on success / NULL on failure.
+ */
+
+struct ata_port *ata_sas_port_alloc(struct ata_host *host,
+ struct ata_port_info *port_info,
+ struct Scsi_Host *shost)
+{
+ struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL);
+ struct ata_probe_ent *ent;
+
+ if (!ap)
+ return NULL;
+
+ ent = ata_probe_ent_alloc(host->dev, port_info);
+ if (!ent) {
+ kfree(ap);
+ return NULL;
+ }
+
+ ata_port_init(ap, host, ent, 0);
+ ap->lock = shost->host_lock;
+ kfree(ent);
+ return ap;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
+
+/**
+ * ata_sas_port_start - Set port up for dma.
+ * @ap: Port to initialize
+ *
+ * Called just after data structures for each port are
+ * initialized. Allocates DMA pad.
+ *
+ * May be used as the port_start() entry in ata_port_operations.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+int ata_sas_port_start(struct ata_port *ap)
+{
+ return ata_pad_alloc(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_start);
+
+/**
+ * ata_port_stop - Undo ata_sas_port_start()
+ * @ap: Port to shut down
+ *
+ * Frees the DMA pad.
+ *
+ * May be used as the port_stop() entry in ata_port_operations.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+
+void ata_sas_port_stop(struct ata_port *ap)
+{
+ ata_pad_free(ap, ap->dev);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_stop);
+
+/**
+ * ata_sas_port_init - Initialize a SATA device
+ * @ap: SATA port to initialize
+ *
+ * LOCKING:
+ * PCI/etc. bus probe sem.
+ *
+ * RETURNS:
+ * Zero on success, non-zero on error.
+ */
+
+int ata_sas_port_init(struct ata_port *ap)
+{
+ int rc = ap->ops->port_start(ap);
+
+ if (!rc)
+ rc = ata_bus_probe(ap);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_init);
+
+/**
+ * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
+ * @ap: SATA port to destroy
+ *
+ */
+
+void ata_sas_port_destroy(struct ata_port *ap)
+{
+ ap->ops->port_stop(ap);
+ kfree(ap);
+}
+EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
+
+/**
+ * ata_sas_slave_configure - Default slave_config routine for libata devices
+ * @sdev: SCSI device to configure
+ * @ap: ATA port to which SCSI device is attached
+ *
+ * RETURNS:
+ * Zero.
+ */
+
+int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
+{
+ ata_scsi_sdev_config(sdev);
+ ata_scsi_dev_config(sdev, ap->device);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
+
+/**
+ * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
+ * @cmd: SCSI command to be sent
+ * @done: Completion function, called when command is complete
+ * @ap: ATA port to which the command is being sent
+ *
+ * RETURNS:
+ * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
+ * 0 otherwise.
+ */
+
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
+ struct ata_port *ap)
+{
+ int rc = 0;
+
+ ata_scsi_dump_cdb(ap, cmd);
+
+ if (likely(ata_scsi_dev_enabled(ap->device)))
+ rc = __ata_scsi_queuecmd(cmd, done, ap->device);
+ else {
+ cmd->result = (DID_BAD_TARGET << 16);
+ done(cmd);
+ }
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
git://git.onelab.eu / linux-2.6.git / blobdiff