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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/ata/libata-scsi.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c4807
1 files changed, 4807 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
new file mode 100644
index 0000000000..4209fb39f6
--- /dev/null
+++ b/drivers/ata/libata-scsi.c
@@ -0,0 +1,4807 @@
+// 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 2048
+
+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
+#define CDL_T2A_SUB_MPAGE 0x07
+#define CDL_T2B_SUB_MPAGE 0x08
+#define CDL_T2_SUB_MPAGE_LEN 232
+#define ATA_FEATURE_SUB_MPAGE 0xf2
+#define ATA_FEATURE_SUB_MPAGE_LEN 16
+
+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;
+ int input;
+ unsigned long flags;
+ int rc;
+
+ rc = kstrtoint(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);
+
+bool ata_scsi_sense_is_valid(u8 sk, u8 asc, u8 ascq)
+{
+ /*
+ * If sk == NO_SENSE, and asc + ascq == NO ADDITIONAL SENSE INFORMATION,
+ * then there is no sense data to add.
+ */
+ if (sk == 0 && asc == 0 && ascq == 0)
+ return false;
+
+ /* If sk > COMPLETED, sense data is bogus. */
+ if (sk > COMPLETED)
+ return false;
+
+ return true;
+}
+
+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);
+
+ 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;
+
+ 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;
+ struct scsi_sense_hdr sshdr;
+ const struct scsi_exec_args exec_args = {
+ .sshdr = &sshdr,
+ .sense = sensebuf,
+ .sense_len = sizeof(sensebuf),
+ };
+ 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 */
+ } else {
+ scsi_cmd[1] = (3 << 1); /* Non-data */
+ scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
+ }
+
+ 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_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, argbuf,
+ argsize, 10 * HZ, 5, &exec_args);
+ 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;
+ const struct scsi_exec_args exec_args = {
+ .sshdr = &sshdr,
+ .sense = sensebuf,
+ .sense_len = sizeof(sensebuf),
+ };
+
+ 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_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, NULL,
+ 0, 10 * HZ, 5, &exec_args);
+ 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(ata_port_is_frozen(ap)))
+ 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_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
+ *
+ * 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 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];
+ return;
+ }
+ }
+ }
+
+ /*
+ * 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];
+ return;
+ }
+ }
+
+ /*
+ * 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;
+}
+
+/*
+ * 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;
+ 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);
+ 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;
+ 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);
+ 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);
+
+ /*
+ * Ask the sd driver to issue START STOP UNIT on runtime suspend
+ * and resume and shutdown only. For system level suspend/resume,
+ * devices power state is handled directly by libata EH.
+ * Given that disks are always spun up on system resume, also
+ * make sure that the sd driver forces runtime suspended disks
+ * to be resumed to correctly reflect the power state of the
+ * device.
+ */
+ sdev->manage_runtime_start_stop = 1;
+ sdev->manage_shutdown = 1;
+ sdev->force_runtime_start_on_system_start = 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 (ata_ncq_supported(dev))
+ 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_alloc - Early setup of SCSI device
+ * @sdev: SCSI device to examine
+ *
+ * This is called from scsi_alloc_sdev() when the scsi device
+ * associated with an ATA device is scanned on a port.
+ *
+ * LOCKING:
+ * Defined by SCSI layer. We don't really care.
+ */
+
+int ata_scsi_slave_alloc(struct scsi_device *sdev)
+{
+ struct ata_port *ap = ata_shost_to_port(sdev->host);
+ struct device_link *link;
+
+ ata_scsi_sdev_config(sdev);
+
+ /*
+ * Create a link from the ata_port device to the scsi device to ensure
+ * that PM does suspend/resume in the correct order: the scsi device is
+ * consumer (child) and the ata port the supplier (parent).
+ */
+ link = device_link_add(&sdev->sdev_gendev, &ap->tdev,
+ DL_FLAG_STATELESS |
+ DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
+ if (!link) {
+ ata_port_err(ap, "Failed to create link to scsi device %s\n",
+ dev_name(&sdev->sdev_gendev));
+ return -ENODEV;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc);
+
+/**
+ * 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);
+
+ if (dev)
+ return ata_scsi_dev_config(sdev, dev);
+
+ return 0;
+}
+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;
+
+ device_link_remove(&sdev->sdev_gendev, &ap->tdev);
+
+ 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]);
+}
+
+/**
+ * scsi_dld - Get duration limit descriptor index
+ * @cdb: SCSI command to translate
+ *
+ * Returns the dld bits indicating the index of a command duration limit
+ * descriptor.
+ */
+static inline int scsi_dld(const u8 *cdb)
+{
+ return ((cdb[1] & 0x01) << 2) | ((cdb[14] >> 6) & 0x03);
+}
+
+/**
+ * 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;
+ int dld = 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);
+ dld = scsi_dld(cdb);
+ 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, block, n_block, tf_flags, dld, 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 scsi_cmnd *cmd = qc->scsicmd;
+ u8 *cdb = cmd->cmnd;
+ int need_sense = (qc->err_mask != 0) &&
+ !(qc->flags & ATA_QCFLAG_SENSE_VALID);
+
+ /* 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 (need_sense)
+ ata_gen_ata_sense(qc);
+ else
+ /* Keep the SCSI ML and status byte, clear host byte. */
+ cmd->result &= 0x0000ffff;
+
+ 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 */
+ }
+
+ if (args->dev->flags & ATA_DFLAG_CDL)
+ hdr[2] = 0xd; /* claim SPC-6 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);
+}
+
+/*
+ * Simulate MODE SENSE control mode page, sub-page 0.
+ */
+static unsigned int ata_msense_control_spg0(struct ata_device *dev, u8 *buf,
+ bool changeable)
+{
+ modecpy(buf, def_control_mpage,
+ sizeof(def_control_mpage), changeable);
+ if (changeable) {
+ /* ata_mselect_control() */
+ buf[2] |= (1 << 2);
+ } else {
+ bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
+
+ /* descriptor format sense data */
+ buf[2] |= (d_sense << 2);
+ }
+
+ return sizeof(def_control_mpage);
+}
+
+/*
+ * Translate an ATA duration limit in microseconds to a SCSI duration limit
+ * using the t2cdlunits 0xa (10ms). Since the SCSI duration limits are 2-bytes
+ * only, take care of overflows.
+ */
+static inline u16 ata_xlat_cdl_limit(u8 *buf)
+{
+ u32 limit = get_unaligned_le32(buf);
+
+ return min_t(u32, limit / 10000, 65535);
+}
+
+/*
+ * Simulate MODE SENSE control mode page, sub-pages 07h and 08h
+ * (command duration limits T2A and T2B mode pages).
+ */
+static unsigned int ata_msense_control_spgt2(struct ata_device *dev, u8 *buf,
+ u8 spg)
+{
+ u8 *b, *cdl = dev->cdl, *desc;
+ u32 policy;
+ int i;
+
+ /*
+ * Fill the subpage. The first four bytes of the T2A/T2B mode pages
+ * are a header. The PAGE LENGTH field is the size of the page
+ * excluding the header.
+ */
+ buf[0] = CONTROL_MPAGE;
+ buf[1] = spg;
+ put_unaligned_be16(CDL_T2_SUB_MPAGE_LEN - 4, &buf[2]);
+ if (spg == CDL_T2A_SUB_MPAGE) {
+ /*
+ * Read descriptors map to the T2A page:
+ * set perf_vs_duration_guidleine.
+ */
+ buf[7] = (cdl[0] & 0x03) << 4;
+ desc = cdl + 64;
+ } else {
+ /* Write descriptors map to the T2B page */
+ desc = cdl + 288;
+ }
+
+ /* Fill the T2 page descriptors */
+ b = &buf[8];
+ policy = get_unaligned_le32(&cdl[0]);
+ for (i = 0; i < 7; i++, b += 32, desc += 32) {
+ /* t2cdlunits: fixed to 10ms */
+ b[0] = 0x0a;
+
+ /* Max inactive time and its policy */
+ put_unaligned_be16(ata_xlat_cdl_limit(&desc[8]), &b[2]);
+ b[6] = ((policy >> 8) & 0x0f) << 4;
+
+ /* Max active time and its policy */
+ put_unaligned_be16(ata_xlat_cdl_limit(&desc[4]), &b[4]);
+ b[6] |= (policy >> 4) & 0x0f;
+
+ /* Command duration guideline and its policy */
+ put_unaligned_be16(ata_xlat_cdl_limit(&desc[16]), &b[10]);
+ b[14] = policy & 0x0f;
+ }
+
+ return CDL_T2_SUB_MPAGE_LEN;
+}
+
+/*
+ * Simulate MODE SENSE control mode page, sub-page f2h
+ * (ATA feature control mode page).
+ */
+static unsigned int ata_msense_control_ata_feature(struct ata_device *dev,
+ u8 *buf)
+{
+ /* PS=0, SPF=1 */
+ buf[0] = CONTROL_MPAGE | (1 << 6);
+ buf[1] = ATA_FEATURE_SUB_MPAGE;
+
+ /*
+ * The first four bytes of ATA Feature Control mode page are a header.
+ * The PAGE LENGTH field is the size of the page excluding the header.
+ */
+ put_unaligned_be16(ATA_FEATURE_SUB_MPAGE_LEN - 4, &buf[2]);
+
+ if (dev->flags & ATA_DFLAG_CDL)
+ buf[4] = 0x02; /* Support T2A and T2B pages */
+ else
+ buf[4] = 0;
+
+ return ATA_FEATURE_SUB_MPAGE_LEN;
+}
+
+/**
+ * ata_msense_control - Simulate MODE SENSE control mode page
+ * @dev: ATA device of interest
+ * @buf: output buffer
+ * @spg: sub-page code
+ * @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,
+ u8 spg, bool changeable)
+{
+ unsigned int n;
+
+ switch (spg) {
+ case 0:
+ return ata_msense_control_spg0(dev, buf, changeable);
+ case CDL_T2A_SUB_MPAGE:
+ case CDL_T2B_SUB_MPAGE:
+ return ata_msense_control_spgt2(dev, buf, spg);
+ case ATA_FEATURE_SUB_MPAGE:
+ return ata_msense_control_ata_feature(dev, buf);
+ case ALL_SUB_MPAGES:
+ n = ata_msense_control_spg0(dev, buf, changeable);
+ n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE);
+ n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE);
+ n += ata_msense_control_ata_feature(dev, buf + n);
+ return n;
+ default:
+ return 0;
+ }
+}
+
+/**
+ * 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);
+}
+
+/**
+ * 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 = 0, 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];
+
+ /*
+ * Supported subpages: all subpages and sub-pages 07h, 08h and f2h of
+ * the control page.
+ */
+ if (spg) {
+ switch (spg) {
+ case ALL_SUB_MPAGES:
+ break;
+ case CDL_T2A_SUB_MPAGE:
+ case CDL_T2B_SUB_MPAGE:
+ case ATA_FEATURE_SUB_MPAGE:
+ if (dev->flags & ATA_DFLAG_CDL && pg == CONTROL_MPAGE)
+ break;
+ fallthrough;
+ default:
+ 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, spg, 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, spg, page_control == 1);
+ break;
+
+ default: /* invalid page code */
+ fp = 2;
+ goto invalid_fld;
+ }
+
+ if (dev->flags & ATA_DFLAG_FUA)
+ 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 {
+ put_unaligned_be16(p - rbuf - 2, &rbuf[0]);
+ 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;
+}
+
+/*
+ * 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 EH */
+ if (unlikely(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 path */
+ 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, unsigned int devno)
+{
+ /*
+ * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case),
+ * or 2 (IDE master + slave case). However, the former case includes
+ * libsas hosted devices which are numbered per scsi host, leading
+ * to devno potentially being larger than 0 but with each struct
+ * ata_device having its own struct ata_port and struct ata_link.
+ * To accommodate these, ignore devno and always use device number 0.
+ */
+ if (likely(!sata_pmp_attached(ap))) {
+ int link_max_devices = ata_link_max_devices(&ap->link);
+
+ if (link_max_devices == 1)
+ return &ap->link.device[0];
+
+ if (devno < link_max_devices)
+ return &ap->link.device[devno];
+
+ return NULL;
+ }
+
+ /*
+ * For PMP-attached devices, the device number corresponds to C
+ * (channel) of SCSI [H:C:I:L], indicating the port pmp link
+ * for the device.
+ */
+ if (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, cdlp = 0, rwcdlp = 0;
+ unsigned int err = 0;
+
+ if (cdb[2] != 1 && cdb[2] != 3) {
+ 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 SYNCHRONIZE_CACHE_16:
+ 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 WRITE_6:
+ case WRITE_10:
+ 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 READ_16:
+ supported = 3;
+ if (dev->flags & ATA_DFLAG_CDL) {
+ /*
+ * CDL read descriptors map to the T2A page, that is,
+ * rwcdlp = 0x01 and cdlp = 0x01
+ */
+ rwcdlp = 0x01;
+ cdlp = 0x01 << 3;
+ }
+ break;
+ case WRITE_16:
+ supported = 3;
+ if (dev->flags & ATA_DFLAG_CDL) {
+ /*
+ * CDL write descriptors map to the T2B page, that is,
+ * rwcdlp = 0x01 and cdlp = 0x02
+ */
+ rwcdlp = 0x01;
+ cdlp = 0x02 << 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:
+ /* One command format */
+ rbuf[0] = rwcdlp;
+ rbuf[1] = cdlp | 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;
+}
+
+/*
+ * Simulate MODE SELECT control mode page, sub-page 0.
+ */
+static int ata_mselect_control_spg0(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_spg0(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;
+}
+
+/*
+ * Translate MODE SELECT control mode page, sub-pages f2h (ATA feature mode
+ * page) into a SET FEATURES command.
+ */
+static unsigned int ata_mselect_control_ata_feature(struct ata_queued_cmd *qc,
+ const u8 *buf, int len,
+ u16 *fp)
+{
+ struct ata_device *dev = qc->dev;
+ struct ata_taskfile *tf = &qc->tf;
+ u8 cdl_action;
+
+ /*
+ * The first four bytes of ATA Feature Control mode page are a header,
+ * so offsets in mpage are off by 4 compared to buf. Same for len.
+ */
+ if (len != ATA_FEATURE_SUB_MPAGE_LEN - 4) {
+ *fp = min(len, ATA_FEATURE_SUB_MPAGE_LEN - 4);
+ return -EINVAL;
+ }
+
+ /* Check cdl_ctrl */
+ switch (buf[0] & 0x03) {
+ case 0:
+ /* Disable CDL */
+ cdl_action = 0;
+ dev->flags &= ~ATA_DFLAG_CDL_ENABLED;
+ break;
+ case 0x02:
+ /* Enable CDL T2A/T2B: NCQ priority must be disabled */
+ if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED) {
+ ata_dev_err(dev,
+ "NCQ priority must be disabled to enable CDL\n");
+ return -EINVAL;
+ }
+ cdl_action = 1;
+ dev->flags |= ATA_DFLAG_CDL_ENABLED;
+ break;
+ default:
+ *fp = 0;
+ return -EINVAL;
+ }
+
+ tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
+ tf->protocol = ATA_PROT_NODATA;
+ tf->command = ATA_CMD_SET_FEATURES;
+ tf->feature = SETFEATURES_CDL;
+ tf->nsect = cdl_action;
+
+ return 1;
+}
+
+/**
+ * ata_mselect_control - Simulate MODE SELECT for control page
+ * @qc: Storage for translated ATA taskfile
+ * @spg: target sub-page of the control page
+ * @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, u8 spg,
+ const u8 *buf, int len, u16 *fp)
+{
+ switch (spg) {
+ case 0:
+ return ata_mselect_control_spg0(qc, buf, len, fp);
+ case ATA_FEATURE_SUB_MPAGE:
+ return ata_mselect_control_ata_feature(qc, buf, len, fp);
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * 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, ret;
+ 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;
+ }
+
+ /*
+ * Supported subpages: all subpages and ATA feature sub-page f2h of
+ * the control page.
+ */
+ if (spg) {
+ switch (spg) {
+ case ALL_SUB_MPAGES:
+ /* All subpages is not supported for the control page */
+ if (pg == CONTROL_MPAGE) {
+ fp = (p[0] & 0x40) ? 1 : 0;
+ fp += hdr_len + bd_len;
+ goto invalid_param;
+ }
+ break;
+ case ATA_FEATURE_SUB_MPAGE:
+ if (qc->dev->flags & ATA_DFLAG_CDL &&
+ pg == CONTROL_MPAGE)
+ break;
+ fallthrough;
+ default:
+ 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:
+ ret = ata_mselect_control(qc, spg, p, pg_len, &fp);
+ if (ret < 0) {
+ fp += hdr_len + bd_len;
+ goto invalid_param;
+ }
+ if (!ret)
+ 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:
+ case SYNCHRONIZE_CACHE_16:
+ 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)
+{
+ struct ata_port *ap = dev->link->ap;
+ u8 scsi_op = scmd->cmnd[0];
+ ata_xlat_func_t xlat_func;
+
+ /*
+ * scsi_queue_rq() will defer commands if scsi_host_in_recovery().
+ * However, this check is done without holding the ap->lock (a libata
+ * specific lock), so we can have received an error irq since then,
+ * therefore we must check if EH is pending, while holding ap->lock.
+ */
+ if (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS))
+ return SCSI_MLQUEUE_DEVICE_BUSY;
+
+ 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:
+ case SYNCHRONIZE_CACHE_16:
+ 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] & 0x1f) == 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, const 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 (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.work);
+ struct ata_link *link;
+ struct ata_device *dev;
+ unsigned long flags;
+ int ret = 0;
+
+ 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 the port was suspended before this was scheduled,
+ * bail out.
+ */
+ if (ap->pflags & ATA_PFLAG_SUSPENDED)
+ goto unlock;
+
+ if (!sdev)
+ continue;
+ if (scsi_device_get(sdev))
+ continue;
+
+ spin_unlock_irqrestore(ap->lock, flags);
+ ret = scsi_rescan_device(sdev);
+ scsi_device_put(sdev);
+ spin_lock_irqsave(ap->lock, flags);
+
+ if (ret)
+ goto unlock;
+ }
+ }
+
+unlock:
+ spin_unlock_irqrestore(ap->lock, flags);
+ mutex_unlock(&ap->scsi_scan_mutex);
+
+ /* Reschedule with a delay if scsi_rescan_device() returned an error */
+ if (ret)
+ schedule_delayed_work(&ap->scsi_rescan_task,
+ msecs_to_jiffies(5));
+}