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Diffstat (limited to '')
| -rw-r--r-- | drivers/ata/libata-scsi.c | 4694 |
1 files changed, 4694 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c new file mode 100644 index 000000000..a9da2f05e --- /dev/null +++ b/drivers/ata/libata-scsi.c @@ -0,0 +1,4694 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * libata-scsi.c - helper library for ATA + * + * Copyright 2003-2004 Red Hat, Inc. All rights reserved. + * Copyright 2003-2004 Jeff Garzik + * + * libata documentation is available via 'make {ps|pdf}docs', + * as Documentation/driver-api/libata.rst + * + * Hardware documentation available from + * - http://www.t10.org/ + * - http://www.t13.org/ + */ + +#include <linux/compat.h> +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/blkdev.h> +#include <linux/spinlock.h> +#include <linux/export.h> +#include <scsi/scsi.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_tcq.h> +#include <scsi/scsi_transport.h> +#include <linux/libata.h> +#include <linux/hdreg.h> +#include <linux/uaccess.h> +#include <linux/suspend.h> +#include <asm/unaligned.h> +#include <linux/ioprio.h> +#include <linux/of.h> + +#include "libata.h" +#include "libata-transport.h" + +#define ATA_SCSI_RBUF_SIZE 576 + +static DEFINE_SPINLOCK(ata_scsi_rbuf_lock); +static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE]; + +typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc); + +static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap, + const struct scsi_device *scsidev); + +#define RW_RECOVERY_MPAGE 0x1 +#define RW_RECOVERY_MPAGE_LEN 12 +#define CACHE_MPAGE 0x8 +#define CACHE_MPAGE_LEN 20 +#define CONTROL_MPAGE 0xa +#define CONTROL_MPAGE_LEN 12 +#define ALL_MPAGES 0x3f +#define ALL_SUB_MPAGES 0xff + + +static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = { + RW_RECOVERY_MPAGE, + RW_RECOVERY_MPAGE_LEN - 2, + (1 << 7), /* AWRE */ + 0, /* read retry count */ + 0, 0, 0, 0, + 0, /* write retry count */ + 0, 0, 0 +}; + +static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = { + CACHE_MPAGE, + CACHE_MPAGE_LEN - 2, + 0, /* contains WCE, needs to be 0 for logic */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, /* contains DRA, needs to be 0 for logic */ + 0, 0, 0, 0, 0, 0, 0 +}; + +static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = { + CONTROL_MPAGE, + CONTROL_MPAGE_LEN - 2, + 2, /* DSENSE=0, GLTSD=1 */ + 0, /* [QAM+QERR may be 1, see 05-359r1] */ + 0, 0, 0, 0, 0xff, 0xff, + 0, 30 /* extended self test time, see 05-359r1 */ +}; + +static ssize_t ata_scsi_park_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct scsi_device *sdev = to_scsi_device(device); + struct ata_port *ap; + struct ata_link *link; + struct ata_device *dev; + unsigned long now; + unsigned int msecs; + int rc = 0; + + ap = ata_shost_to_port(sdev->host); + + spin_lock_irq(ap->lock); + dev = ata_scsi_find_dev(ap, sdev); + if (!dev) { + rc = -ENODEV; + goto unlock; + } + if (dev->flags & ATA_DFLAG_NO_UNLOAD) { + rc = -EOPNOTSUPP; + goto unlock; + } + + link = dev->link; + now = jiffies; + if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS && + link->eh_context.unloaded_mask & (1 << dev->devno) && + time_after(dev->unpark_deadline, now)) + msecs = jiffies_to_msecs(dev->unpark_deadline - now); + else + msecs = 0; + +unlock: + spin_unlock_irq(ap->lock); + + return rc ? rc : sysfs_emit(buf, "%u\n", msecs); +} + +static ssize_t ata_scsi_park_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct scsi_device *sdev = to_scsi_device(device); + struct ata_port *ap; + struct ata_device *dev; + long int input; + unsigned long flags; + int rc; + + rc = kstrtol(buf, 10, &input); + if (rc) + return rc; + if (input < -2) + return -EINVAL; + if (input > ATA_TMOUT_MAX_PARK) { + rc = -EOVERFLOW; + input = ATA_TMOUT_MAX_PARK; + } + + ap = ata_shost_to_port(sdev->host); + + spin_lock_irqsave(ap->lock, flags); + dev = ata_scsi_find_dev(ap, sdev); + if (unlikely(!dev)) { + rc = -ENODEV; + goto unlock; + } + if (dev->class != ATA_DEV_ATA && + dev->class != ATA_DEV_ZAC) { + rc = -EOPNOTSUPP; + goto unlock; + } + + if (input >= 0) { + if (dev->flags & ATA_DFLAG_NO_UNLOAD) { + rc = -EOPNOTSUPP; + goto unlock; + } + + dev->unpark_deadline = ata_deadline(jiffies, input); + dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK; + ata_port_schedule_eh(ap); + complete(&ap->park_req_pending); + } else { + switch (input) { + case -1: + dev->flags &= ~ATA_DFLAG_NO_UNLOAD; + break; + case -2: + dev->flags |= ATA_DFLAG_NO_UNLOAD; + break; + } + } +unlock: + spin_unlock_irqrestore(ap->lock, flags); + + return rc ? rc : len; +} +DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR, + ata_scsi_park_show, ata_scsi_park_store); +EXPORT_SYMBOL_GPL(dev_attr_unload_heads); + +void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd, + u8 sk, u8 asc, u8 ascq) +{ + bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); + + if (!cmd) + return; + + scsi_build_sense(cmd, d_sense, sk, asc, ascq); +} + +void ata_scsi_set_sense_information(struct ata_device *dev, + struct scsi_cmnd *cmd, + const struct ata_taskfile *tf) +{ + u64 information; + + if (!cmd) + return; + + information = ata_tf_read_block(tf, dev); + if (information == U64_MAX) + return; + + scsi_set_sense_information(cmd->sense_buffer, + SCSI_SENSE_BUFFERSIZE, information); +} + +static void ata_scsi_set_invalid_field(struct ata_device *dev, + struct scsi_cmnd *cmd, u16 field, u8 bit) +{ + ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0); + /* "Invalid field in CDB" */ + scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, + field, bit, 1); +} + +static void ata_scsi_set_invalid_parameter(struct ata_device *dev, + struct scsi_cmnd *cmd, u16 field) +{ + /* "Invalid field in parameter list" */ + ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0); + scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE, + field, 0xff, 0); +} + +static struct attribute *ata_common_sdev_attrs[] = { + &dev_attr_unload_heads.attr, + NULL +}; + +static const struct attribute_group ata_common_sdev_attr_group = { + .attrs = ata_common_sdev_attrs +}; + +const struct attribute_group *ata_common_sdev_groups[] = { + &ata_common_sdev_attr_group, + NULL +}; +EXPORT_SYMBOL_GPL(ata_common_sdev_groups); + +/** + * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd. + * @sdev: SCSI device for which BIOS geometry is to be determined + * @bdev: block device associated with @sdev + * @capacity: capacity of SCSI device + * @geom: location to which geometry will be output + * + * Generic bios head/sector/cylinder calculator + * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS) + * mapping. Some situations may arise where the disk is not + * bootable if this is not used. + * + * LOCKING: + * Defined by the SCSI layer. We don't really care. + * + * RETURNS: + * Zero. + */ +int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev, + sector_t capacity, int geom[]) +{ + geom[0] = 255; + geom[1] = 63; + sector_div(capacity, 255*63); + geom[2] = capacity; + + return 0; +} +EXPORT_SYMBOL_GPL(ata_std_bios_param); + +/** + * ata_scsi_unlock_native_capacity - unlock native capacity + * @sdev: SCSI device to adjust device capacity for + * + * This function is called if a partition on @sdev extends beyond + * the end of the device. It requests EH to unlock HPA. + * + * LOCKING: + * Defined by the SCSI layer. Might sleep. + */ +void ata_scsi_unlock_native_capacity(struct scsi_device *sdev) +{ + struct ata_port *ap = ata_shost_to_port(sdev->host); + struct ata_device *dev; + unsigned long flags; + + spin_lock_irqsave(ap->lock, flags); + + dev = ata_scsi_find_dev(ap, sdev); + if (dev && dev->n_sectors < dev->n_native_sectors) { + dev->flags |= ATA_DFLAG_UNLOCK_HPA; + dev->link->eh_info.action |= ATA_EH_RESET; + ata_port_schedule_eh(ap); + } + + spin_unlock_irqrestore(ap->lock, flags); + ata_port_wait_eh(ap); +} +EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity); + +/** + * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl + * @ap: target port + * @sdev: SCSI device to get identify data for + * @arg: User buffer area for identify data + * + * LOCKING: + * Defined by the SCSI layer. We don't really care. + * + * RETURNS: + * Zero on success, negative errno on error. + */ +static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev, + void __user *arg) +{ + struct ata_device *dev = ata_scsi_find_dev(ap, sdev); + u16 __user *dst = arg; + char buf[40]; + + if (!dev) + return -ENOMSG; + + if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16))) + return -EFAULT; + + ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN); + if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN)) + return -EFAULT; + + ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN); + if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN)) + return -EFAULT; + + ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN); + if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN)) + return -EFAULT; + + return 0; +} + +/** + * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl + * @scsidev: Device to which we are issuing command + * @arg: User provided data for issuing command + * + * LOCKING: + * Defined by the SCSI layer. We don't really care. + * + * RETURNS: + * Zero on success, negative errno on error. + */ +int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg) +{ + int rc = 0; + u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; + u8 scsi_cmd[MAX_COMMAND_SIZE]; + u8 args[4], *argbuf = NULL; + int argsize = 0; + enum dma_data_direction data_dir; + struct scsi_sense_hdr sshdr; + int cmd_result; + + if (arg == NULL) + return -EINVAL; + + if (copy_from_user(args, arg, sizeof(args))) + return -EFAULT; + + memset(sensebuf, 0, sizeof(sensebuf)); + memset(scsi_cmd, 0, sizeof(scsi_cmd)); + + if (args[3]) { + argsize = ATA_SECT_SIZE * args[3]; + argbuf = kmalloc(argsize, GFP_KERNEL); + if (argbuf == NULL) { + rc = -ENOMEM; + goto error; + } + + scsi_cmd[1] = (4 << 1); /* PIO Data-in */ + scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev, + block count in sector count field */ + data_dir = DMA_FROM_DEVICE; + } else { + scsi_cmd[1] = (3 << 1); /* Non-data */ + scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ + data_dir = DMA_NONE; + } + + scsi_cmd[0] = ATA_16; + + scsi_cmd[4] = args[2]; + if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */ + scsi_cmd[6] = args[3]; + scsi_cmd[8] = args[1]; + scsi_cmd[10] = ATA_SMART_LBAM_PASS; + scsi_cmd[12] = ATA_SMART_LBAH_PASS; + } else { + scsi_cmd[6] = args[1]; + } + scsi_cmd[14] = args[0]; + + /* Good values for timeout and retries? Values below + from scsi_ioctl_send_command() for default case... */ + cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize, + sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL); + + if (cmd_result < 0) { + rc = cmd_result; + goto error; + } + if (scsi_sense_valid(&sshdr)) {/* sense data available */ + u8 *desc = sensebuf + 8; + + /* If we set cc then ATA pass-through will cause a + * check condition even if no error. Filter that. */ + if (scsi_status_is_check_condition(cmd_result)) { + if (sshdr.sense_key == RECOVERED_ERROR && + sshdr.asc == 0 && sshdr.ascq == 0x1d) + cmd_result &= ~SAM_STAT_CHECK_CONDITION; + } + + /* Send userspace a few ATA registers (same as drivers/ide) */ + if (sensebuf[0] == 0x72 && /* format is "descriptor" */ + desc[0] == 0x09) { /* code is "ATA Descriptor" */ + args[0] = desc[13]; /* status */ + args[1] = desc[3]; /* error */ + args[2] = desc[5]; /* sector count (0:7) */ + if (copy_to_user(arg, args, sizeof(args))) + rc = -EFAULT; + } + } + + + if (cmd_result) { + rc = -EIO; + goto error; + } + + if ((argbuf) + && copy_to_user(arg + sizeof(args), argbuf, argsize)) + rc = -EFAULT; +error: + kfree(argbuf); + return rc; +} + +/** + * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl + * @scsidev: Device to which we are issuing command + * @arg: User provided data for issuing command + * + * LOCKING: + * Defined by the SCSI layer. We don't really care. + * + * RETURNS: + * Zero on success, negative errno on error. + */ +int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg) +{ + int rc = 0; + u8 sensebuf[SCSI_SENSE_BUFFERSIZE]; + u8 scsi_cmd[MAX_COMMAND_SIZE]; + u8 args[7]; + struct scsi_sense_hdr sshdr; + int cmd_result; + + if (arg == NULL) + return -EINVAL; + + if (copy_from_user(args, arg, sizeof(args))) + return -EFAULT; + + memset(sensebuf, 0, sizeof(sensebuf)); + memset(scsi_cmd, 0, sizeof(scsi_cmd)); + scsi_cmd[0] = ATA_16; + scsi_cmd[1] = (3 << 1); /* Non-data */ + scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */ + scsi_cmd[4] = args[1]; + scsi_cmd[6] = args[2]; + scsi_cmd[8] = args[3]; + scsi_cmd[10] = args[4]; + scsi_cmd[12] = args[5]; + scsi_cmd[13] = args[6] & 0x4f; + scsi_cmd[14] = args[0]; + + /* Good values for timeout and retries? Values below + from scsi_ioctl_send_command() for default case... */ + cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0, + sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL); + + if (cmd_result < 0) { + rc = cmd_result; + goto error; + } + if (scsi_sense_valid(&sshdr)) {/* sense data available */ + u8 *desc = sensebuf + 8; + + /* If we set cc then ATA pass-through will cause a + * check condition even if no error. Filter that. */ + if (cmd_result & SAM_STAT_CHECK_CONDITION) { + if (sshdr.sense_key == RECOVERED_ERROR && + sshdr.asc == 0 && sshdr.ascq == 0x1d) + cmd_result &= ~SAM_STAT_CHECK_CONDITION; + } + + /* Send userspace ATA registers */ + if (sensebuf[0] == 0x72 && /* format is "descriptor" */ + desc[0] == 0x09) {/* code is "ATA Descriptor" */ + args[0] = desc[13]; /* status */ + args[1] = desc[3]; /* error */ + args[2] = desc[5]; /* sector count (0:7) */ + args[3] = desc[7]; /* lbal */ + args[4] = desc[9]; /* lbam */ + args[5] = desc[11]; /* lbah */ + args[6] = desc[12]; /* select */ + if (copy_to_user(arg, args, sizeof(args))) + rc = -EFAULT; + } + } + + if (cmd_result) { + rc = -EIO; + goto error; + } + + error: + return rc; +} + +static bool ata_ioc32(struct ata_port *ap) +{ + if (ap->flags & ATA_FLAG_PIO_DMA) + return true; + if (ap->pflags & ATA_PFLAG_PIO32) + return true; + return false; +} + +/* + * This handles both native and compat commands, so anything added + * here must have a compatible argument, or check in_compat_syscall() + */ +int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev, + unsigned int cmd, void __user *arg) +{ + unsigned long val; + int rc = -EINVAL; + unsigned long flags; + + switch (cmd) { + case HDIO_GET_32BIT: + spin_lock_irqsave(ap->lock, flags); + val = ata_ioc32(ap); + spin_unlock_irqrestore(ap->lock, flags); +#ifdef CONFIG_COMPAT + if (in_compat_syscall()) + return put_user(val, (compat_ulong_t __user *)arg); +#endif + return put_user(val, (unsigned long __user *)arg); + + case HDIO_SET_32BIT: + val = (unsigned long) arg; + rc = 0; + spin_lock_irqsave(ap->lock, flags); + if (ap->pflags & ATA_PFLAG_PIO32CHANGE) { + if (val) + ap->pflags |= ATA_PFLAG_PIO32; + else + ap->pflags &= ~ATA_PFLAG_PIO32; + } else { + if (val != ata_ioc32(ap)) + rc = -EINVAL; + } + spin_unlock_irqrestore(ap->lock, flags); + return rc; + + case HDIO_GET_IDENTITY: + return ata_get_identity(ap, scsidev, arg); + + case HDIO_DRIVE_CMD: + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + return ata_cmd_ioctl(scsidev, arg); + + case HDIO_DRIVE_TASK: + if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) + return -EACCES; + return ata_task_ioctl(scsidev, arg); + + default: + rc = -ENOTTY; + break; + } + + return rc; +} +EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl); + +int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd, + void __user *arg) +{ + return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host), + scsidev, cmd, arg); +} +EXPORT_SYMBOL_GPL(ata_scsi_ioctl); + +/** + * ata_scsi_qc_new - acquire new ata_queued_cmd reference + * @dev: ATA device to which the new command is attached + * @cmd: SCSI command that originated this ATA command + * + * Obtain a reference to an unused ata_queued_cmd structure, + * which is the basic libata structure representing a single + * ATA command sent to the hardware. + * + * If a command was available, fill in the SCSI-specific + * portions of the structure with information on the + * current command. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Command allocated, or %NULL if none available. + */ +static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev, + struct scsi_cmnd *cmd) +{ + struct ata_port *ap = dev->link->ap; + struct ata_queued_cmd *qc; + int tag; + + if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) + goto fail; + + if (ap->flags & ATA_FLAG_SAS_HOST) { + /* + * SAS hosts may queue > ATA_MAX_QUEUE commands so use + * unique per-device budget token as a tag. + */ + if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE)) + goto fail; + tag = cmd->budget_token; + } else { + tag = scsi_cmd_to_rq(cmd)->tag; + } + + qc = __ata_qc_from_tag(ap, tag); + qc->tag = qc->hw_tag = tag; + qc->ap = ap; + qc->dev = dev; + + ata_qc_reinit(qc); + + qc->scsicmd = cmd; + qc->scsidone = scsi_done; + + qc->sg = scsi_sglist(cmd); + qc->n_elem = scsi_sg_count(cmd); + + if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET) + qc->flags |= ATA_QCFLAG_QUIET; + + return qc; + +fail: + set_host_byte(cmd, DID_OK); + set_status_byte(cmd, SAM_STAT_TASK_SET_FULL); + scsi_done(cmd); + return NULL; +} + +static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + + qc->extrabytes = scmd->extra_len; + qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes; +} + +/** + * ata_dump_status - user friendly display of error info + * @ap: the port in question + * @tf: ptr to filled out taskfile + * + * Decode and dump the ATA error/status registers for the user so + * that they have some idea what really happened at the non + * make-believe layer. + * + * LOCKING: + * inherited from caller + */ +static void ata_dump_status(struct ata_port *ap, struct ata_taskfile *tf) +{ + u8 stat = tf->status, err = tf->error; + + if (stat & ATA_BUSY) { + ata_port_warn(ap, "status=0x%02x {Busy} ", stat); + } else { + ata_port_warn(ap, "status=0x%02x { %s%s%s%s%s%s%s} ", stat, + stat & ATA_DRDY ? "DriveReady " : "", + stat & ATA_DF ? "DeviceFault " : "", + stat & ATA_DSC ? "SeekComplete " : "", + stat & ATA_DRQ ? "DataRequest " : "", + stat & ATA_CORR ? "CorrectedError " : "", + stat & ATA_SENSE ? "Sense " : "", + stat & ATA_ERR ? "Error " : ""); + if (err) + ata_port_warn(ap, "error=0x%02x {%s%s%s%s%s%s", err, + err & ATA_ABORTED ? + "DriveStatusError " : "", + err & ATA_ICRC ? + (err & ATA_ABORTED ? + "BadCRC " : "Sector ") : "", + err & ATA_UNC ? "UncorrectableError " : "", + err & ATA_IDNF ? "SectorIdNotFound " : "", + err & ATA_TRK0NF ? "TrackZeroNotFound " : "", + err & ATA_AMNF ? "AddrMarkNotFound " : ""); + } +} + +/** + * ata_to_sense_error - convert ATA error to SCSI error + * @id: ATA device number + * @drv_stat: value contained in ATA status register + * @drv_err: value contained in ATA error register + * @sk: the sense key we'll fill out + * @asc: the additional sense code we'll fill out + * @ascq: the additional sense code qualifier we'll fill out + * @verbose: be verbose + * + * Converts an ATA error into a SCSI error. Fill out pointers to + * SK, ASC, and ASCQ bytes for later use in fixed or descriptor + * format sense blocks. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, + u8 *asc, u8 *ascq, int verbose) +{ + int i; + + /* Based on the 3ware driver translation table */ + static const unsigned char sense_table[][4] = { + /* BBD|ECC|ID|MAR */ + {0xd1, ABORTED_COMMAND, 0x00, 0x00}, + // Device busy Aborted command + /* BBD|ECC|ID */ + {0xd0, ABORTED_COMMAND, 0x00, 0x00}, + // Device busy Aborted command + /* ECC|MC|MARK */ + {0x61, HARDWARE_ERROR, 0x00, 0x00}, + // Device fault Hardware error + /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */ + {0x84, ABORTED_COMMAND, 0x47, 0x00}, + // Data CRC error SCSI parity error + /* MC|ID|ABRT|TRK0|MARK */ + {0x37, NOT_READY, 0x04, 0x00}, + // Unit offline Not ready + /* MCR|MARK */ + {0x09, NOT_READY, 0x04, 0x00}, + // Unrecovered disk error Not ready + /* Bad address mark */ + {0x01, MEDIUM_ERROR, 0x13, 0x00}, + // Address mark not found for data field + /* TRK0 - Track 0 not found */ + {0x02, HARDWARE_ERROR, 0x00, 0x00}, + // Hardware error + /* Abort: 0x04 is not translated here, see below */ + /* Media change request */ + {0x08, NOT_READY, 0x04, 0x00}, + // FIXME: faking offline + /* SRV/IDNF - ID not found */ + {0x10, ILLEGAL_REQUEST, 0x21, 0x00}, + // Logical address out of range + /* MC - Media Changed */ + {0x20, UNIT_ATTENTION, 0x28, 0x00}, + // Not ready to ready change, medium may have changed + /* ECC - Uncorrectable ECC error */ + {0x40, MEDIUM_ERROR, 0x11, 0x04}, + // Unrecovered read error + /* BBD - block marked bad */ + {0x80, MEDIUM_ERROR, 0x11, 0x04}, + // Block marked bad Medium error, unrecovered read error + {0xFF, 0xFF, 0xFF, 0xFF}, // END mark + }; + static const unsigned char stat_table[][4] = { + /* Must be first because BUSY means no other bits valid */ + {0x80, ABORTED_COMMAND, 0x47, 0x00}, + // Busy, fake parity for now + {0x40, ILLEGAL_REQUEST, 0x21, 0x04}, + // Device ready, unaligned write command + {0x20, HARDWARE_ERROR, 0x44, 0x00}, + // Device fault, internal target failure + {0x08, ABORTED_COMMAND, 0x47, 0x00}, + // Timed out in xfer, fake parity for now + {0x04, RECOVERED_ERROR, 0x11, 0x00}, + // Recovered ECC error Medium error, recovered + {0xFF, 0xFF, 0xFF, 0xFF}, // END mark + }; + + /* + * Is this an error we can process/parse + */ + if (drv_stat & ATA_BUSY) { + drv_err = 0; /* Ignore the err bits, they're invalid */ + } + + if (drv_err) { + /* Look for drv_err */ + for (i = 0; sense_table[i][0] != 0xFF; i++) { + /* Look for best matches first */ + if ((sense_table[i][0] & drv_err) == + sense_table[i][0]) { + *sk = sense_table[i][1]; + *asc = sense_table[i][2]; + *ascq = sense_table[i][3]; + goto translate_done; + } + } + } + + /* + * Fall back to interpreting status bits. Note that if the drv_err + * has only the ABRT bit set, we decode drv_stat. ABRT by itself + * is not descriptive enough. + */ + for (i = 0; stat_table[i][0] != 0xFF; i++) { + if (stat_table[i][0] & drv_stat) { + *sk = stat_table[i][1]; + *asc = stat_table[i][2]; + *ascq = stat_table[i][3]; + goto translate_done; + } + } + + /* + * We need a sensible error return here, which is tricky, and one + * that won't cause people to do things like return a disk wrongly. + */ + *sk = ABORTED_COMMAND; + *asc = 0x00; + *ascq = 0x00; + + translate_done: + if (verbose) + pr_err("ata%u: translated ATA stat/err 0x%02x/%02x to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", + id, drv_stat, drv_err, *sk, *asc, *ascq); + return; +} + +/* + * ata_gen_passthru_sense - Generate check condition sense block. + * @qc: Command that completed. + * + * This function is specific to the ATA descriptor format sense + * block specified for the ATA pass through commands. Regardless + * of whether the command errored or not, return a sense + * block. Copy all controller registers into the sense + * block. If there was no error, we get the request from an ATA + * passthrough command, so we use the following sense data: + * sk = RECOVERED ERROR + * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE + * + * + * LOCKING: + * None. + */ +static void ata_gen_passthru_sense(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *cmd = qc->scsicmd; + struct ata_taskfile *tf = &qc->result_tf; + unsigned char *sb = cmd->sense_buffer; + unsigned char *desc = sb + 8; + int verbose = qc->ap->ops->error_handler == NULL; + u8 sense_key, asc, ascq; + + memset(sb, 0, SCSI_SENSE_BUFFERSIZE); + + /* + * Use ata_to_sense_error() to map status register bits + * onto sense key, asc & ascq. + */ + if (qc->err_mask || + tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { + ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, + &sense_key, &asc, &ascq, verbose); + ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq); + } else { + /* + * ATA PASS-THROUGH INFORMATION AVAILABLE + * Always in descriptor format sense. + */ + scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D); + } + + if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) { + u8 len; + + /* descriptor format */ + len = sb[7]; + desc = (char *)scsi_sense_desc_find(sb, len + 8, 9); + if (!desc) { + if (SCSI_SENSE_BUFFERSIZE < len + 14) + return; + sb[7] = len + 14; + desc = sb + 8 + len; + } + desc[0] = 9; + desc[1] = 12; + /* + * Copy registers into sense buffer. + */ + desc[2] = 0x00; + desc[3] = tf->error; + desc[5] = tf->nsect; + desc[7] = tf->lbal; + desc[9] = tf->lbam; + desc[11] = tf->lbah; + desc[12] = tf->device; + desc[13] = tf->status; + + /* + * Fill in Extend bit, and the high order bytes + * if applicable. + */ + if (tf->flags & ATA_TFLAG_LBA48) { + desc[2] |= 0x01; + desc[4] = tf->hob_nsect; + desc[6] = tf->hob_lbal; + desc[8] = tf->hob_lbam; + desc[10] = tf->hob_lbah; + } + } else { + /* Fixed sense format */ + desc[0] = tf->error; + desc[1] = tf->status; + desc[2] = tf->device; + desc[3] = tf->nsect; + desc[7] = 0; + if (tf->flags & ATA_TFLAG_LBA48) { + desc[8] |= 0x80; + if (tf->hob_nsect) + desc[8] |= 0x40; + if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah) + desc[8] |= 0x20; + } + desc[9] = tf->lbal; + desc[10] = tf->lbam; + desc[11] = tf->lbah; + } +} + +/** + * ata_gen_ata_sense - generate a SCSI fixed sense block + * @qc: Command that we are erroring out + * + * Generate sense block for a failed ATA command @qc. Descriptor + * format is used to accommodate LBA48 block address. + * + * LOCKING: + * None. + */ +static void ata_gen_ata_sense(struct ata_queued_cmd *qc) +{ + struct ata_device *dev = qc->dev; + struct scsi_cmnd *cmd = qc->scsicmd; + struct ata_taskfile *tf = &qc->result_tf; + unsigned char *sb = cmd->sense_buffer; + int verbose = qc->ap->ops->error_handler == NULL; + u64 block; + u8 sense_key, asc, ascq; + + memset(sb, 0, SCSI_SENSE_BUFFERSIZE); + + if (ata_dev_disabled(dev)) { + /* Device disabled after error recovery */ + /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */ + ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21); + return; + } + /* Use ata_to_sense_error() to map status register bits + * onto sense key, asc & ascq. + */ + if (qc->err_mask || + tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) { + ata_to_sense_error(qc->ap->print_id, tf->status, tf->error, + &sense_key, &asc, &ascq, verbose); + ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq); + } else { + /* Could not decode error */ + ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n", + tf->status, qc->err_mask); + ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0); + return; + } + + block = ata_tf_read_block(&qc->result_tf, dev); + if (block == U64_MAX) + return; + + scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block); +} + +void ata_scsi_sdev_config(struct scsi_device *sdev) +{ + sdev->use_10_for_rw = 1; + sdev->use_10_for_ms = 1; + sdev->no_write_same = 1; + + /* Schedule policy is determined by ->qc_defer() callback and + * it needs to see every deferred qc. Set dev_blocked to 1 to + * prevent SCSI midlayer from automatically deferring + * requests. + */ + sdev->max_device_blocked = 1; +} + +/** + * ata_scsi_dma_need_drain - Check whether data transfer may overflow + * @rq: request to be checked + * + * ATAPI commands which transfer variable length data to host + * might overflow due to application error or hardware bug. This + * function checks whether overflow should be drained and ignored + * for @request. + * + * LOCKING: + * None. + * + * RETURNS: + * 1 if ; otherwise, 0. + */ +bool ata_scsi_dma_need_drain(struct request *rq) +{ + struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq); + + return atapi_cmd_type(scmd->cmnd[0]) == ATAPI_MISC; +} +EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain); + +int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev) +{ + struct request_queue *q = sdev->request_queue; + int depth = 1; + + if (!ata_id_has_unload(dev->id)) + dev->flags |= ATA_DFLAG_NO_UNLOAD; + + /* configure max sectors */ + dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors); + blk_queue_max_hw_sectors(q, dev->max_sectors); + + if (dev->class == ATA_DEV_ATAPI) { + sdev->sector_size = ATA_SECT_SIZE; + + /* set DMA padding */ + blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1); + + /* make room for appending the drain */ + blk_queue_max_segments(q, queue_max_segments(q) - 1); + + sdev->dma_drain_len = ATAPI_MAX_DRAIN; + sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO); + if (!sdev->dma_drain_buf) { + ata_dev_err(dev, "drain buffer allocation failed\n"); + return -ENOMEM; + } + } else { + sdev->sector_size = ata_id_logical_sector_size(dev->id); + + /* + * 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 (dev->flags & ATA_DFLAG_NCQ) + depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id)); + depth = min(ATA_MAX_QUEUE, depth); + scsi_change_queue_depth(sdev, depth); + + if (dev->flags & ATA_DFLAG_TRUSTED) + sdev->security_supported = 1; + + dev->sdev = sdev; + return 0; +} + +/** + * ata_scsi_slave_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; + + if (!ap->ops->error_handler) + return; + + 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]); +} + +/** + * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one + * @qc: Storage for translated ATA taskfile + * + * Converts SCSI VERIFY command to an ATA READ VERIFY command. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Zero on success, non-zero on error. + */ +static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + struct ata_taskfile *tf = &qc->tf; + struct ata_device *dev = qc->dev; + u64 dev_sectors = qc->dev->n_sectors; + const u8 *cdb = scmd->cmnd; + u64 block; + u32 n_block; + u16 fp; + + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + tf->protocol = ATA_PROT_NODATA; + + switch (cdb[0]) { + case VERIFY: + if (scmd->cmd_len < 10) { + fp = 9; + goto invalid_fld; + } + scsi_10_lba_len(cdb, &block, &n_block); + break; + case VERIFY_16: + if (scmd->cmd_len < 16) { + fp = 15; + goto invalid_fld; + } + scsi_16_lba_len(cdb, &block, &n_block); + break; + default: + fp = 0; + goto invalid_fld; + } + + if (!n_block) + goto nothing_to_do; + if (block >= dev_sectors) + goto out_of_range; + if ((block + n_block) > dev_sectors) + goto out_of_range; + + if (dev->flags & ATA_DFLAG_LBA) { + tf->flags |= ATA_TFLAG_LBA; + + if (lba_28_ok(block, n_block)) { + /* use LBA28 */ + tf->command = ATA_CMD_VERIFY; + tf->device |= (block >> 24) & 0xf; + } else if (lba_48_ok(block, n_block)) { + if (!(dev->flags & ATA_DFLAG_LBA48)) + goto out_of_range; + + /* use LBA48 */ + tf->flags |= ATA_TFLAG_LBA48; + tf->command = ATA_CMD_VERIFY_EXT; + + tf->hob_nsect = (n_block >> 8) & 0xff; + + tf->hob_lbah = (block >> 40) & 0xff; + tf->hob_lbam = (block >> 32) & 0xff; + tf->hob_lbal = (block >> 24) & 0xff; + } else + /* request too large even for LBA48 */ + goto out_of_range; + + tf->nsect = n_block & 0xff; + + tf->lbah = (block >> 16) & 0xff; + tf->lbam = (block >> 8) & 0xff; + tf->lbal = block & 0xff; + + tf->device |= ATA_LBA; + } else { + /* CHS */ + u32 sect, head, cyl, track; + + if (!lba_28_ok(block, n_block)) + goto out_of_range; + + /* Convert LBA to CHS */ + track = (u32)block / dev->sectors; + cyl = track / dev->heads; + head = track % dev->heads; + sect = (u32)block % dev->sectors + 1; + + /* Check whether the converted CHS can fit. + Cylinder: 0-65535 + Head: 0-15 + Sector: 1-255*/ + if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) + goto out_of_range; + + tf->command = ATA_CMD_VERIFY; + tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */ + tf->lbal = sect; + tf->lbam = cyl; + tf->lbah = cyl >> 8; + tf->device |= head; + } + + return 0; + +invalid_fld: + ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); + return 1; + +out_of_range: + ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); + /* "Logical Block Address out of range" */ + return 1; + +nothing_to_do: + scmd->result = SAM_STAT_GOOD; + return 1; +} + +static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks) +{ + struct request *rq = scsi_cmd_to_rq(scmd); + u32 req_blocks; + + if (!blk_rq_is_passthrough(rq)) + return true; + + req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size; + if (n_blocks > req_blocks) + return false; + + return true; +} + +/** + * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one + * @qc: Storage for translated ATA taskfile + * + * Converts any of six SCSI read/write commands into the + * ATA counterpart, including starting sector (LBA), + * sector count, and taking into account the device's LBA48 + * support. + * + * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and + * %WRITE_16 are currently supported. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Zero on success, non-zero on error. + */ +static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + const u8 *cdb = scmd->cmnd; + struct request *rq = scsi_cmd_to_rq(scmd); + int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq)); + unsigned int tf_flags = 0; + u64 block; + u32 n_block; + int rc; + u16 fp = 0; + + switch (cdb[0]) { + case WRITE_6: + case WRITE_10: + case WRITE_16: + tf_flags |= ATA_TFLAG_WRITE; + break; + } + + /* Calculate the SCSI LBA, transfer length and FUA. */ + switch (cdb[0]) { + case READ_10: + case WRITE_10: + if (unlikely(scmd->cmd_len < 10)) { + fp = 9; + goto invalid_fld; + } + scsi_10_lba_len(cdb, &block, &n_block); + if (cdb[1] & (1 << 3)) + tf_flags |= ATA_TFLAG_FUA; + if (!ata_check_nblocks(scmd, n_block)) + goto invalid_fld; + break; + case READ_6: + case WRITE_6: + if (unlikely(scmd->cmd_len < 6)) { + fp = 5; + goto invalid_fld; + } + scsi_6_lba_len(cdb, &block, &n_block); + + /* for 6-byte r/w commands, transfer length 0 + * means 256 blocks of data, not 0 block. + */ + if (!n_block) + n_block = 256; + if (!ata_check_nblocks(scmd, n_block)) + goto invalid_fld; + break; + case READ_16: + case WRITE_16: + if (unlikely(scmd->cmd_len < 16)) { + fp = 15; + goto invalid_fld; + } + scsi_16_lba_len(cdb, &block, &n_block); + if (cdb[1] & (1 << 3)) + tf_flags |= ATA_TFLAG_FUA; + if (!ata_check_nblocks(scmd, n_block)) + goto invalid_fld; + break; + default: + fp = 0; + goto invalid_fld; + } + + /* Check and compose ATA command */ + if (!n_block) + /* For 10-byte and 16-byte SCSI R/W commands, transfer + * length 0 means transfer 0 block of data. + * However, for ATA R/W commands, sector count 0 means + * 256 or 65536 sectors, not 0 sectors as in SCSI. + * + * WARNING: one or two older ATA drives treat 0 as 0... + */ + goto nothing_to_do; + + qc->flags |= ATA_QCFLAG_IO; + qc->nbytes = n_block * scmd->device->sector_size; + + rc = ata_build_rw_tf(qc, block, n_block, tf_flags, class); + if (likely(rc == 0)) + return 0; + + if (rc == -ERANGE) + goto out_of_range; + /* treat all other errors as -EINVAL, fall through */ +invalid_fld: + ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); + return 1; + +out_of_range: + ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0); + /* "Logical Block Address out of range" */ + return 1; + +nothing_to_do: + scmd->result = SAM_STAT_GOOD; + return 1; +} + +static void ata_qc_done(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *cmd = qc->scsicmd; + void (*done)(struct scsi_cmnd *) = qc->scsidone; + + ata_qc_free(qc); + done(cmd); +} + +static void ata_scsi_qc_complete(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct scsi_cmnd *cmd = qc->scsicmd; + u8 *cdb = cmd->cmnd; + int need_sense = (qc->err_mask != 0); + + /* For ATA pass thru (SAT) commands, generate a sense block if + * user mandated it or if there's an error. Note that if we + * generate because the user forced us to [CK_COND =1], a check + * condition is generated and the ATA register values are returned + * whether the command completed successfully or not. If there + * was no error, we use the following sense data: + * sk = RECOVERED ERROR + * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE + */ + if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) && + ((cdb[2] & 0x20) || need_sense)) + ata_gen_passthru_sense(qc); + else if (qc->flags & ATA_QCFLAG_SENSE_VALID) + cmd->result = SAM_STAT_CHECK_CONDITION; + else if (need_sense) + ata_gen_ata_sense(qc); + else + cmd->result = SAM_STAT_GOOD; + + if (need_sense && !ap->ops->error_handler) + ata_dump_status(ap, &qc->result_tf); + + ata_qc_done(qc); +} + +/** + * ata_scsi_translate - Translate then issue SCSI command to ATA device + * @dev: ATA device to which the command is addressed + * @cmd: SCSI command to execute + * @xlat_func: Actor which translates @cmd to an ATA taskfile + * + * Our ->queuecommand() function has decided that the SCSI + * command issued can be directly translated into an ATA + * command, rather than handled internally. + * + * This function sets up an ata_queued_cmd structure for the + * SCSI command, and sends that ata_queued_cmd to the hardware. + * + * The xlat_func argument (actor) returns 0 if ready to execute + * ATA command, else 1 to finish translation. If 1 is returned + * then cmd->result (and possibly cmd->sense_buffer) are assumed + * to be set reflecting an error condition or clean (early) + * termination. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command + * needs to be deferred. + */ +static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd, + ata_xlat_func_t xlat_func) +{ + struct ata_port *ap = dev->link->ap; + struct ata_queued_cmd *qc; + int rc; + + qc = ata_scsi_qc_new(dev, cmd); + if (!qc) + goto err_mem; + + /* data is present; dma-map it */ + if (cmd->sc_data_direction == DMA_FROM_DEVICE || + cmd->sc_data_direction == DMA_TO_DEVICE) { + if (unlikely(scsi_bufflen(cmd) < 1)) { + ata_dev_warn(dev, "WARNING: zero len r/w req\n"); + goto err_did; + } + + ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd)); + + qc->dma_dir = cmd->sc_data_direction; + } + + qc->complete_fn = ata_scsi_qc_complete; + + if (xlat_func(qc)) + goto early_finish; + + if (ap->ops->qc_defer) { + if ((rc = ap->ops->qc_defer(qc))) + goto defer; + } + + /* select device, send command to hardware */ + ata_qc_issue(qc); + + return 0; + +early_finish: + ata_qc_free(qc); + scsi_done(cmd); + return 0; + +err_did: + ata_qc_free(qc); + cmd->result = (DID_ERROR << 16); + scsi_done(cmd); +err_mem: + return 0; + +defer: + ata_qc_free(qc); + if (rc == ATA_DEFER_LINK) + return SCSI_MLQUEUE_DEVICE_BUSY; + else + return SCSI_MLQUEUE_HOST_BUSY; +} + +struct ata_scsi_args { + struct ata_device *dev; + u16 *id; + struct scsi_cmnd *cmd; +}; + +/** + * ata_scsi_rbuf_fill - wrapper for SCSI command simulators + * @args: device IDENTIFY data / SCSI command of interest. + * @actor: Callback hook for desired SCSI command simulator + * + * Takes care of the hard work of simulating a SCSI command... + * Mapping the response buffer, calling the command's handler, + * and handling the handler's return value. This return value + * indicates whether the handler wishes the SCSI command to be + * completed successfully (0), or not (in which case cmd->result + * and sense buffer are assumed to be set). + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static void ata_scsi_rbuf_fill(struct ata_scsi_args *args, + unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf)) +{ + unsigned int rc; + struct scsi_cmnd *cmd = args->cmd; + unsigned long flags; + + spin_lock_irqsave(&ata_scsi_rbuf_lock, flags); + + memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE); + rc = actor(args, ata_scsi_rbuf); + if (rc == 0) + sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), + ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE); + + spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags); + + if (rc == 0) + cmd->result = SAM_STAT_GOOD; +} + +/** + * ata_scsiop_inq_std - Simulate INQUIRY command + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Returns standard device identification data associated + * with non-VPD INQUIRY command output. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf) +{ + static const u8 versions[] = { + 0x00, + 0x60, /* SAM-3 (no version claimed) */ + + 0x03, + 0x20, /* SBC-2 (no version claimed) */ + + 0x03, + 0x00 /* SPC-3 (no version claimed) */ + }; + static const u8 versions_zbc[] = { + 0x00, + 0xA0, /* SAM-5 (no version claimed) */ + + 0x06, + 0x00, /* SBC-4 (no version claimed) */ + + 0x05, + 0xC0, /* SPC-5 (no version claimed) */ + + 0x60, + 0x24, /* ZBC r05 */ + }; + + u8 hdr[] = { + TYPE_DISK, + 0, + 0x5, /* claim SPC-3 version compatibility */ + 2, + 95 - 4, + 0, + 0, + 2 + }; + + /* set scsi removable (RMB) bit per ata bit, or if the + * AHCI port says it's external (Hotplug-capable, eSATA). + */ + if (ata_id_removable(args->id) || + (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL)) + hdr[1] |= (1 << 7); + + if (args->dev->class == ATA_DEV_ZAC) { + hdr[0] = TYPE_ZBC; + hdr[2] = 0x7; /* claim SPC-5 version compatibility */ + } + + memcpy(rbuf, hdr, sizeof(hdr)); + memcpy(&rbuf[8], "ATA ", 8); + ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16); + + /* From SAT, use last 2 words from fw rev unless they are spaces */ + ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4); + if (strncmp(&rbuf[32], " ", 4) == 0) + ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4); + + if (rbuf[32] == 0 || rbuf[32] == ' ') + memcpy(&rbuf[32], "n/a ", 4); + + if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC) + memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc)); + else + memcpy(rbuf + 58, versions, sizeof(versions)); + + return 0; +} + +/** + * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Returns list of inquiry VPD pages available. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf) +{ + int i, num_pages = 0; + static const u8 pages[] = { + 0x00, /* page 0x00, this page */ + 0x80, /* page 0x80, unit serial no page */ + 0x83, /* page 0x83, device ident page */ + 0x89, /* page 0x89, ata info page */ + 0xb0, /* page 0xb0, block limits page */ + 0xb1, /* page 0xb1, block device characteristics page */ + 0xb2, /* page 0xb2, thin provisioning page */ + 0xb6, /* page 0xb6, zoned block device characteristics */ + 0xb9, /* page 0xb9, concurrent positioning ranges */ + }; + + for (i = 0; i < sizeof(pages); i++) { + if (pages[i] == 0xb6 && + !(args->dev->flags & ATA_DFLAG_ZAC)) + continue; + rbuf[num_pages + 4] = pages[i]; + num_pages++; + } + rbuf[3] = num_pages; /* number of supported VPD pages */ + return 0; +} + +/** + * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Returns ATA device serial number. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf) +{ + static const u8 hdr[] = { + 0, + 0x80, /* this page code */ + 0, + ATA_ID_SERNO_LEN, /* page len */ + }; + + memcpy(rbuf, hdr, sizeof(hdr)); + ata_id_string(args->id, (unsigned char *) &rbuf[4], + ATA_ID_SERNO, ATA_ID_SERNO_LEN); + return 0; +} + +/** + * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Yields two logical unit device identification designators: + * - vendor specific ASCII containing the ATA serial number + * - SAT defined "t10 vendor id based" containing ASCII vendor + * name ("ATA "), model and serial numbers. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf) +{ + const int sat_model_serial_desc_len = 68; + int num; + + rbuf[1] = 0x83; /* this page code */ + num = 4; + + /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */ + rbuf[num + 0] = 2; + rbuf[num + 3] = ATA_ID_SERNO_LEN; + num += 4; + ata_id_string(args->id, (unsigned char *) rbuf + num, + ATA_ID_SERNO, ATA_ID_SERNO_LEN); + num += ATA_ID_SERNO_LEN; + + /* SAT defined lu model and serial numbers descriptor */ + /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */ + rbuf[num + 0] = 2; + rbuf[num + 1] = 1; + rbuf[num + 3] = sat_model_serial_desc_len; + num += 4; + memcpy(rbuf + num, "ATA ", 8); + num += 8; + ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD, + ATA_ID_PROD_LEN); + num += ATA_ID_PROD_LEN; + ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO, + ATA_ID_SERNO_LEN); + num += ATA_ID_SERNO_LEN; + + if (ata_id_has_wwn(args->id)) { + /* SAT defined lu world wide name */ + /* piv=0, assoc=lu, code_set=binary, designator=NAA */ + rbuf[num + 0] = 1; + rbuf[num + 1] = 3; + rbuf[num + 3] = ATA_ID_WWN_LEN; + num += 4; + ata_id_string(args->id, (unsigned char *) rbuf + num, + ATA_ID_WWN, ATA_ID_WWN_LEN); + num += ATA_ID_WWN_LEN; + } + rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */ + return 0; +} + +/** + * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Yields SAT-specified ATA VPD page. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf) +{ + rbuf[1] = 0x89; /* our page code */ + rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */ + rbuf[3] = (0x238 & 0xff); + + memcpy(&rbuf[8], "linux ", 8); + memcpy(&rbuf[16], "libata ", 16); + memcpy(&rbuf[32], DRV_VERSION, 4); + + rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */ + rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */ + /* TODO: PMP? */ + + /* we don't store the ATA device signature, so we fake it */ + rbuf[38] = ATA_DRDY; /* really, this is Status reg */ + rbuf[40] = 0x1; + rbuf[48] = 0x1; + + rbuf[56] = ATA_CMD_ID_ATA; + + memcpy(&rbuf[60], &args->id[0], 512); + return 0; +} + +static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf) +{ + struct ata_device *dev = args->dev; + u16 min_io_sectors; + + rbuf[1] = 0xb0; + rbuf[3] = 0x3c; /* required VPD size with unmap support */ + + /* + * Optimal transfer length granularity. + * + * This is always one physical block, but for disks with a smaller + * logical than physical sector size we need to figure out what the + * latter is. + */ + min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id); + put_unaligned_be16(min_io_sectors, &rbuf[6]); + + /* + * Optimal unmap granularity. + * + * The ATA spec doesn't even know about a granularity or alignment + * for the TRIM command. We can leave away most of the unmap related + * VPD page entries, but we have specifify a granularity to signal + * that we support some form of unmap - in thise case via WRITE SAME + * with the unmap bit set. + */ + if (ata_id_has_trim(args->id)) { + u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM; + + if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M) + max_blocks = 128 << (20 - SECTOR_SHIFT); + + put_unaligned_be64(max_blocks, &rbuf[36]); + put_unaligned_be32(1, &rbuf[28]); + } + + return 0; +} + +static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf) +{ + int form_factor = ata_id_form_factor(args->id); + int media_rotation_rate = ata_id_rotation_rate(args->id); + u8 zoned = ata_id_zoned_cap(args->id); + + rbuf[1] = 0xb1; + rbuf[3] = 0x3c; + rbuf[4] = media_rotation_rate >> 8; + rbuf[5] = media_rotation_rate; + rbuf[7] = form_factor; + if (zoned) + rbuf[8] = (zoned << 4); + + return 0; +} + +static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf) +{ + /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */ + rbuf[1] = 0xb2; + rbuf[3] = 0x4; + rbuf[5] = 1 << 6; /* TPWS */ + + return 0; +} + +static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf) +{ + /* + * zbc-r05 SCSI Zoned Block device characteristics VPD page + */ + rbuf[1] = 0xb6; + rbuf[3] = 0x3C; + + /* + * URSWRZ bit is only meaningful for host-managed ZAC drives + */ + if (args->dev->zac_zoned_cap & 1) + rbuf[4] |= 1; + put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]); + put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]); + put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]); + + return 0; +} + +static unsigned int ata_scsiop_inq_b9(struct ata_scsi_args *args, u8 *rbuf) +{ + struct ata_cpr_log *cpr_log = args->dev->cpr_log; + u8 *desc = &rbuf[64]; + int i; + + /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */ + rbuf[1] = 0xb9; + put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]); + + for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) { + desc[0] = cpr_log->cpr[i].num; + desc[1] = cpr_log->cpr[i].num_storage_elements; + put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]); + put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[16]); + } + + return 0; +} + +/** + * modecpy - Prepare response for MODE SENSE + * @dest: output buffer + * @src: data being copied + * @n: length of mode page + * @changeable: whether changeable parameters are requested + * + * Generate a generic MODE SENSE page for either current or changeable + * parameters. + * + * LOCKING: + * None. + */ +static void modecpy(u8 *dest, const u8 *src, int n, bool changeable) +{ + if (changeable) { + memcpy(dest, src, 2); + memset(dest + 2, 0, n - 2); + } else { + memcpy(dest, src, n); + } +} + +/** + * ata_msense_caching - Simulate MODE SENSE caching info page + * @id: device IDENTIFY data + * @buf: output buffer + * @changeable: whether changeable parameters are requested + * + * Generate a caching info page, which conditionally indicates + * write caching to the SCSI layer, depending on device + * capabilities. + * + * LOCKING: + * None. + */ +static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable) +{ + modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable); + if (changeable) { + buf[2] |= (1 << 2); /* ata_mselect_caching() */ + } else { + buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */ + buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */ + } + return sizeof(def_cache_mpage); +} + +/** + * ata_msense_control - Simulate MODE SENSE control mode page + * @dev: ATA device of interest + * @buf: output buffer + * @changeable: whether changeable parameters are requested + * + * Generate a generic MODE SENSE control mode page. + * + * LOCKING: + * None. + */ +static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf, + bool changeable) +{ + modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable); + if (changeable) { + buf[2] |= (1 << 2); /* ata_mselect_control() */ + } else { + bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE); + + buf[2] |= (d_sense << 2); /* descriptor format sense data */ + } + return sizeof(def_control_mpage); +} + +/** + * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page + * @buf: output buffer + * @changeable: whether changeable parameters are requested + * + * Generate a generic MODE SENSE r/w error recovery page. + * + * LOCKING: + * None. + */ +static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable) +{ + modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage), + changeable); + return sizeof(def_rw_recovery_mpage); +} + +/* + * We can turn this into a real blacklist if it's needed, for now just + * blacklist any Maxtor BANC1G10 revision firmware + */ +static int ata_dev_supports_fua(u16 *id) +{ + unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1]; + + if (!libata_fua) + return 0; + if (!ata_id_has_fua(id)) + return 0; + + ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model)); + ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw)); + + if (strcmp(model, "Maxtor")) + return 1; + if (strcmp(fw, "BANC1G10")) + return 1; + + return 0; /* blacklisted */ +} + +/** + * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Simulate MODE SENSE commands. Assume this is invoked for direct + * access devices (e.g. disks) only. There should be no block + * descriptor for other device types. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf) +{ + struct ata_device *dev = args->dev; + u8 *scsicmd = args->cmd->cmnd, *p = rbuf; + static const u8 sat_blk_desc[] = { + 0, 0, 0, 0, /* number of blocks: sat unspecified */ + 0, + 0, 0x2, 0x0 /* block length: 512 bytes */ + }; + u8 pg, spg; + unsigned int ebd, page_control, six_byte; + u8 dpofua, bp = 0xff; + u16 fp; + + six_byte = (scsicmd[0] == MODE_SENSE); + ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */ + /* + * LLBA bit in msense(10) ignored (compliant) + */ + + page_control = scsicmd[2] >> 6; + switch (page_control) { + case 0: /* current */ + case 1: /* changeable */ + case 2: /* defaults */ + break; /* supported */ + case 3: /* saved */ + goto saving_not_supp; + default: + fp = 2; + bp = 6; + goto invalid_fld; + } + + if (six_byte) + p += 4 + (ebd ? 8 : 0); + else + p += 8 + (ebd ? 8 : 0); + + pg = scsicmd[2] & 0x3f; + spg = scsicmd[3]; + /* + * No mode subpages supported (yet) but asking for _all_ + * subpages may be valid + */ + if (spg && (spg != ALL_SUB_MPAGES)) { + fp = 3; + goto invalid_fld; + } + + switch(pg) { + case RW_RECOVERY_MPAGE: + p += ata_msense_rw_recovery(p, page_control == 1); + break; + + case CACHE_MPAGE: + p += ata_msense_caching(args->id, p, page_control == 1); + break; + + case CONTROL_MPAGE: + p += ata_msense_control(args->dev, p, page_control == 1); + break; + + case ALL_MPAGES: + p += ata_msense_rw_recovery(p, page_control == 1); + p += ata_msense_caching(args->id, p, page_control == 1); + p += ata_msense_control(args->dev, p, page_control == 1); + break; + + default: /* invalid page code */ + fp = 2; + goto invalid_fld; + } + + dpofua = 0; + if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) && + (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count)) + dpofua = 1 << 4; + + if (six_byte) { + rbuf[0] = p - rbuf - 1; + rbuf[2] |= dpofua; + if (ebd) { + rbuf[3] = sizeof(sat_blk_desc); + memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc)); + } + } else { + unsigned int output_len = p - rbuf - 2; + + rbuf[0] = output_len >> 8; + rbuf[1] = output_len; + rbuf[3] |= dpofua; + if (ebd) { + rbuf[7] = sizeof(sat_blk_desc); + memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc)); + } + } + return 0; + +invalid_fld: + ata_scsi_set_invalid_field(dev, args->cmd, fp, bp); + return 1; + +saving_not_supp: + ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0); + /* "Saving parameters not supported" */ + return 1; +} + +/** + * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Simulate READ CAPACITY commands. + * + * LOCKING: + * None. + */ +static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf) +{ + struct ata_device *dev = args->dev; + u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */ + u32 sector_size; /* physical sector size in bytes */ + u8 log2_per_phys; + u16 lowest_aligned; + + sector_size = ata_id_logical_sector_size(dev->id); + log2_per_phys = ata_id_log2_per_physical_sector(dev->id); + lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys); + + if (args->cmd->cmnd[0] == READ_CAPACITY) { + if (last_lba >= 0xffffffffULL) + last_lba = 0xffffffff; + + /* sector count, 32-bit */ + rbuf[0] = last_lba >> (8 * 3); + rbuf[1] = last_lba >> (8 * 2); + rbuf[2] = last_lba >> (8 * 1); + rbuf[3] = last_lba; + + /* sector size */ + rbuf[4] = sector_size >> (8 * 3); + rbuf[5] = sector_size >> (8 * 2); + rbuf[6] = sector_size >> (8 * 1); + rbuf[7] = sector_size; + } else { + /* sector count, 64-bit */ + rbuf[0] = last_lba >> (8 * 7); + rbuf[1] = last_lba >> (8 * 6); + rbuf[2] = last_lba >> (8 * 5); + rbuf[3] = last_lba >> (8 * 4); + rbuf[4] = last_lba >> (8 * 3); + rbuf[5] = last_lba >> (8 * 2); + rbuf[6] = last_lba >> (8 * 1); + rbuf[7] = last_lba; + + /* sector size */ + rbuf[ 8] = sector_size >> (8 * 3); + rbuf[ 9] = sector_size >> (8 * 2); + rbuf[10] = sector_size >> (8 * 1); + rbuf[11] = sector_size; + + rbuf[12] = 0; + rbuf[13] = log2_per_phys; + rbuf[14] = (lowest_aligned >> 8) & 0x3f; + rbuf[15] = lowest_aligned; + + if (ata_id_has_trim(args->id) && + !(dev->horkage & ATA_HORKAGE_NOTRIM)) { + rbuf[14] |= 0x80; /* LBPME */ + + if (ata_id_has_zero_after_trim(args->id) && + dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) { + ata_dev_info(dev, "Enabling discard_zeroes_data\n"); + rbuf[14] |= 0x40; /* LBPRZ */ + } + } + if (ata_id_zoned_cap(args->id) || + args->dev->class == ATA_DEV_ZAC) + rbuf[12] = (1 << 4); /* RC_BASIS */ + } + return 0; +} + +/** + * ata_scsiop_report_luns - Simulate REPORT LUNS command + * @args: device IDENTIFY data / SCSI command of interest. + * @rbuf: Response buffer, to which simulated SCSI cmd output is sent. + * + * Simulate REPORT LUNS command. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf) +{ + rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */ + + return 0; +} + +static void atapi_sense_complete(struct ata_queued_cmd *qc) +{ + if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) { + /* FIXME: not quite right; we don't want the + * translation of taskfile registers into + * a sense descriptors, since that's only + * correct for ATA, not ATAPI + */ + ata_gen_passthru_sense(qc); + } + + ata_qc_done(qc); +} + +/* is it pointless to prefer PIO for "safety reasons"? */ +static inline int ata_pio_use_silly(struct ata_port *ap) +{ + return (ap->flags & ATA_FLAG_PIO_DMA); +} + +static void atapi_request_sense(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct scsi_cmnd *cmd = qc->scsicmd; + + memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); + +#ifdef CONFIG_ATA_SFF + if (ap->ops->sff_tf_read) + ap->ops->sff_tf_read(ap, &qc->tf); +#endif + + /* fill these in, for the case where they are -not- overwritten */ + cmd->sense_buffer[0] = 0x70; + cmd->sense_buffer[2] = qc->tf.error >> 4; + + ata_qc_reinit(qc); + + /* setup sg table and init transfer direction */ + sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE); + ata_sg_init(qc, &qc->sgent, 1); + qc->dma_dir = DMA_FROM_DEVICE; + + memset(&qc->cdb, 0, qc->dev->cdb_len); + qc->cdb[0] = REQUEST_SENSE; + qc->cdb[4] = SCSI_SENSE_BUFFERSIZE; + + qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + qc->tf.command = ATA_CMD_PACKET; + + if (ata_pio_use_silly(ap)) { + qc->tf.protocol = ATAPI_PROT_DMA; + qc->tf.feature |= ATAPI_PKT_DMA; + } else { + qc->tf.protocol = ATAPI_PROT_PIO; + qc->tf.lbam = SCSI_SENSE_BUFFERSIZE; + qc->tf.lbah = 0; + } + qc->nbytes = SCSI_SENSE_BUFFERSIZE; + + qc->complete_fn = atapi_sense_complete; + + ata_qc_issue(qc); +} + +/* + * ATAPI devices typically report zero for their SCSI version, and sometimes + * deviate from the spec WRT response data format. If SCSI version is + * reported as zero like normal, then we make the following fixups: + * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a + * modern device. + * 2) Ensure response data format / ATAPI information are always correct. + */ +static void atapi_fixup_inquiry(struct scsi_cmnd *cmd) +{ + u8 buf[4]; + + sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); + if (buf[2] == 0) { + buf[2] = 0x5; + buf[3] = 0x32; + } + sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4); +} + +static void atapi_qc_complete(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *cmd = qc->scsicmd; + unsigned int err_mask = qc->err_mask; + + /* handle completion from new EH */ + if (unlikely(qc->ap->ops->error_handler && + (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) { + + if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) { + /* FIXME: not quite right; we don't want the + * translation of taskfile registers into a + * sense descriptors, since that's only + * correct for ATA, not ATAPI + */ + ata_gen_passthru_sense(qc); + } + + /* SCSI EH automatically locks door if sdev->locked is + * set. Sometimes door lock request continues to + * fail, for example, when no media is present. This + * creates a loop - SCSI EH issues door lock which + * fails and gets invoked again to acquire sense data + * for the failed command. + * + * If door lock fails, always clear sdev->locked to + * avoid this infinite loop. + * + * This may happen before SCSI scan is complete. Make + * sure qc->dev->sdev isn't NULL before dereferencing. + */ + if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev) + qc->dev->sdev->locked = 0; + + qc->scsicmd->result = SAM_STAT_CHECK_CONDITION; + ata_qc_done(qc); + return; + } + + /* successful completion or old EH failure path */ + if (unlikely(err_mask & AC_ERR_DEV)) { + cmd->result = SAM_STAT_CHECK_CONDITION; + atapi_request_sense(qc); + return; + } else if (unlikely(err_mask)) { + /* FIXME: not quite right; we don't want the + * translation of taskfile registers into + * a sense descriptors, since that's only + * correct for ATA, not ATAPI + */ + ata_gen_passthru_sense(qc); + } else { + if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0) + atapi_fixup_inquiry(cmd); + cmd->result = SAM_STAT_GOOD; + } + + ata_qc_done(qc); +} +/** + * atapi_xlat - Initialize PACKET taskfile + * @qc: command structure to be initialized + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * Zero on success, non-zero on failure. + */ +static unsigned int atapi_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + struct ata_device *dev = qc->dev; + int nodata = (scmd->sc_data_direction == DMA_NONE); + int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO); + unsigned int nbytes; + + memset(qc->cdb, 0, dev->cdb_len); + memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len); + + qc->complete_fn = atapi_qc_complete; + + qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + if (scmd->sc_data_direction == DMA_TO_DEVICE) { + qc->tf.flags |= ATA_TFLAG_WRITE; + } + + qc->tf.command = ATA_CMD_PACKET; + ata_qc_set_pc_nbytes(qc); + + /* check whether ATAPI DMA is safe */ + if (!nodata && !using_pio && atapi_check_dma(qc)) + using_pio = 1; + + /* Some controller variants snoop this value for Packet + * transfers to do state machine and FIFO management. Thus we + * want to set it properly, and for DMA where it is + * effectively meaningless. + */ + nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024); + + /* Most ATAPI devices which honor transfer chunk size don't + * behave according to the spec when odd chunk size which + * matches the transfer length is specified. If the number of + * bytes to transfer is 2n+1. According to the spec, what + * should happen is to indicate that 2n+1 is going to be + * transferred and transfer 2n+2 bytes where the last byte is + * padding. + * + * In practice, this doesn't happen. ATAPI devices first + * indicate and transfer 2n bytes and then indicate and + * transfer 2 bytes where the last byte is padding. + * + * This inconsistency confuses several controllers which + * perform PIO using DMA such as Intel AHCIs and sil3124/32. + * These controllers use actual number of transferred bytes to + * update DMA pointer and transfer of 4n+2 bytes make those + * controller push DMA pointer by 4n+4 bytes because SATA data + * FISes are aligned to 4 bytes. This causes data corruption + * and buffer overrun. + * + * Always setting nbytes to even number solves this problem + * because then ATAPI devices don't have to split data at 2n + * boundaries. + */ + if (nbytes & 0x1) + nbytes++; + + qc->tf.lbam = (nbytes & 0xFF); + qc->tf.lbah = (nbytes >> 8); + + if (nodata) + qc->tf.protocol = ATAPI_PROT_NODATA; + else if (using_pio) + qc->tf.protocol = ATAPI_PROT_PIO; + else { + /* DMA data xfer */ + qc->tf.protocol = ATAPI_PROT_DMA; + qc->tf.feature |= ATAPI_PKT_DMA; + + if ((dev->flags & ATA_DFLAG_DMADIR) && + (scmd->sc_data_direction != DMA_TO_DEVICE)) + /* some SATA bridges need us to indicate data xfer direction */ + qc->tf.feature |= ATAPI_DMADIR; + } + + + /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE + as ATAPI tape drives don't get this right otherwise */ + return 0; +} + +static struct ata_device *ata_find_dev(struct ata_port *ap, 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; + unsigned int err = 0; + + if (cdb[2] != 1) { + ata_dev_warn(dev, "invalid command format %d\n", cdb[2]); + err = 2; + goto out; + } + switch (cdb[3]) { + case INQUIRY: + case MODE_SENSE: + case MODE_SENSE_10: + case READ_CAPACITY: + case SERVICE_ACTION_IN_16: + case REPORT_LUNS: + case REQUEST_SENSE: + case SYNCHRONIZE_CACHE: + case 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 READ_16: + case WRITE_6: + case WRITE_10: + case WRITE_16: + case ATA_12: + case ATA_16: + case VERIFY: + case VERIFY_16: + case MODE_SELECT: + case MODE_SELECT_10: + case START_STOP: + supported = 3; + break; + case ZBC_IN: + case ZBC_OUT: + if (ata_id_zoned_cap(dev->id) || + dev->class == ATA_DEV_ZAC) + supported = 3; + break; + case SECURITY_PROTOCOL_IN: + case SECURITY_PROTOCOL_OUT: + if (dev->flags & ATA_DFLAG_TRUSTED) + supported = 3; + break; + default: + break; + } +out: + rbuf[1] = supported; /* supported */ + return err; +} + +/** + * ata_scsi_report_zones_complete - convert ATA output + * @qc: command structure returning the data + * + * Convert T-13 little-endian field representation into + * T-10 big-endian field representation. + * What a mess. + */ +static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + struct sg_mapping_iter miter; + unsigned long flags; + unsigned int bytes = 0; + + sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd), + SG_MITER_TO_SG | SG_MITER_ATOMIC); + + local_irq_save(flags); + while (sg_miter_next(&miter)) { + unsigned int offset = 0; + + if (bytes == 0) { + char *hdr; + u32 list_length; + u64 max_lba, opt_lba; + u16 same; + + /* Swizzle header */ + hdr = miter.addr; + list_length = get_unaligned_le32(&hdr[0]); + same = get_unaligned_le16(&hdr[4]); + max_lba = get_unaligned_le64(&hdr[8]); + opt_lba = get_unaligned_le64(&hdr[16]); + put_unaligned_be32(list_length, &hdr[0]); + hdr[4] = same & 0xf; + put_unaligned_be64(max_lba, &hdr[8]); + put_unaligned_be64(opt_lba, &hdr[16]); + offset += 64; + bytes += 64; + } + while (offset < miter.length) { + char *rec; + u8 cond, type, non_seq, reset; + u64 size, start, wp; + + /* Swizzle zone descriptor */ + rec = miter.addr + offset; + type = rec[0] & 0xf; + cond = (rec[1] >> 4) & 0xf; + non_seq = (rec[1] & 2); + reset = (rec[1] & 1); + size = get_unaligned_le64(&rec[8]); + start = get_unaligned_le64(&rec[16]); + wp = get_unaligned_le64(&rec[24]); + rec[0] = type; + rec[1] = (cond << 4) | non_seq | reset; + put_unaligned_be64(size, &rec[8]); + put_unaligned_be64(start, &rec[16]); + put_unaligned_be64(wp, &rec[24]); + WARN_ON(offset + 64 > miter.length); + offset += 64; + bytes += 64; + } + } + sg_miter_stop(&miter); + local_irq_restore(flags); + + ata_scsi_qc_complete(qc); +} + +static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc) +{ + struct ata_taskfile *tf = &qc->tf; + struct scsi_cmnd *scmd = qc->scsicmd; + const u8 *cdb = scmd->cmnd; + u16 sect, fp = (u16)-1; + u8 sa, options, bp = 0xff; + u64 block; + u32 n_block; + + if (unlikely(scmd->cmd_len < 16)) { + ata_dev_warn(qc->dev, "invalid cdb length %d\n", + scmd->cmd_len); + fp = 15; + goto invalid_fld; + } + scsi_16_lba_len(cdb, &block, &n_block); + if (n_block != scsi_bufflen(scmd)) { + ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n", + n_block, scsi_bufflen(scmd)); + goto invalid_param_len; + } + sa = cdb[1] & 0x1f; + if (sa != ZI_REPORT_ZONES) { + ata_dev_warn(qc->dev, "invalid service action %d\n", sa); + fp = 1; + goto invalid_fld; + } + /* + * ZAC allows only for transfers in 512 byte blocks, + * and uses a 16 bit value for the transfer count. + */ + if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) { + ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block); + goto invalid_param_len; + } + sect = n_block / 512; + options = cdb[14] & 0xbf; + + if (ata_ncq_enabled(qc->dev) && + ata_fpdma_zac_mgmt_in_supported(qc->dev)) { + tf->protocol = ATA_PROT_NCQ; + tf->command = ATA_CMD_FPDMA_RECV; + tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f; + tf->nsect = qc->hw_tag << 3; + tf->feature = sect & 0xff; + tf->hob_feature = (sect >> 8) & 0xff; + tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8); + } else { + tf->command = ATA_CMD_ZAC_MGMT_IN; + tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES; + tf->protocol = ATA_PROT_DMA; + tf->hob_feature = options; + tf->hob_nsect = (sect >> 8) & 0xff; + tf->nsect = sect & 0xff; + } + tf->device = ATA_LBA; + tf->lbah = (block >> 16) & 0xff; + tf->lbam = (block >> 8) & 0xff; + tf->lbal = block & 0xff; + tf->hob_lbah = (block >> 40) & 0xff; + tf->hob_lbam = (block >> 32) & 0xff; + tf->hob_lbal = (block >> 24) & 0xff; + + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; + qc->flags |= ATA_QCFLAG_RESULT_TF; + + ata_qc_set_pc_nbytes(qc); + + qc->complete_fn = ata_scsi_report_zones_complete; + + return 0; + +invalid_fld: + ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); + return 1; + +invalid_param_len: + /* "Parameter list length error" */ + ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); + return 1; +} + +static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc) +{ + struct ata_taskfile *tf = &qc->tf; + struct scsi_cmnd *scmd = qc->scsicmd; + struct ata_device *dev = qc->dev; + const u8 *cdb = scmd->cmnd; + u8 all, sa; + u64 block; + u32 n_block; + u16 fp = (u16)-1; + + if (unlikely(scmd->cmd_len < 16)) { + fp = 15; + goto invalid_fld; + } + + sa = cdb[1] & 0x1f; + if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) && + (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) { + fp = 1; + goto invalid_fld; + } + + scsi_16_lba_len(cdb, &block, &n_block); + if (n_block) { + /* + * ZAC MANAGEMENT OUT doesn't define any length + */ + goto invalid_param_len; + } + + all = cdb[14] & 0x1; + if (all) { + /* + * Ignore the block address (zone ID) as defined by ZBC. + */ + block = 0; + } else if (block >= dev->n_sectors) { + /* + * Block must be a valid zone ID (a zone start LBA). + */ + fp = 2; + goto invalid_fld; + } + + if (ata_ncq_enabled(qc->dev) && + ata_fpdma_zac_mgmt_out_supported(qc->dev)) { + tf->protocol = ATA_PROT_NCQ_NODATA; + tf->command = ATA_CMD_NCQ_NON_DATA; + tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT; + tf->nsect = qc->hw_tag << 3; + tf->auxiliary = sa | ((u16)all << 8); + } else { + tf->protocol = ATA_PROT_NODATA; + tf->command = ATA_CMD_ZAC_MGMT_OUT; + tf->feature = sa; + tf->hob_feature = all; + } + tf->lbah = (block >> 16) & 0xff; + tf->lbam = (block >> 8) & 0xff; + tf->lbal = block & 0xff; + tf->hob_lbah = (block >> 40) & 0xff; + tf->hob_lbam = (block >> 32) & 0xff; + tf->hob_lbal = (block >> 24) & 0xff; + tf->device = ATA_LBA; + tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48; + + return 0; + + invalid_fld: + ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff); + return 1; +invalid_param_len: + /* "Parameter list length error" */ + ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); + return 1; +} + +/** + * ata_mselect_caching - Simulate MODE SELECT for caching info page + * @qc: Storage for translated ATA taskfile + * @buf: input buffer + * @len: number of valid bytes in the input buffer + * @fp: out parameter for the failed field on error + * + * Prepare a taskfile to modify caching information for the device. + * + * LOCKING: + * None. + */ +static int ata_mselect_caching(struct ata_queued_cmd *qc, + const u8 *buf, int len, u16 *fp) +{ + struct ata_taskfile *tf = &qc->tf; + struct ata_device *dev = qc->dev; + u8 mpage[CACHE_MPAGE_LEN]; + u8 wce; + int i; + + /* + * The first two bytes of def_cache_mpage are a header, so offsets + * in mpage are off by 2 compared to buf. Same for len. + */ + + if (len != CACHE_MPAGE_LEN - 2) { + *fp = min(len, CACHE_MPAGE_LEN - 2); + return -EINVAL; + } + + wce = buf[0] & (1 << 2); + + /* + * Check that read-only bits are not modified. + */ + ata_msense_caching(dev->id, mpage, false); + for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) { + if (i == 0) + continue; + if (mpage[i + 2] != buf[i]) { + *fp = i; + return -EINVAL; + } + } + + tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; + tf->protocol = ATA_PROT_NODATA; + tf->nsect = 0; + tf->command = ATA_CMD_SET_FEATURES; + tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF; + return 0; +} + +/** + * ata_mselect_control - Simulate MODE SELECT for control page + * @qc: Storage for translated ATA taskfile + * @buf: input buffer + * @len: number of valid bytes in the input buffer + * @fp: out parameter for the failed field on error + * + * Prepare a taskfile to modify caching information for the device. + * + * LOCKING: + * None. + */ +static int ata_mselect_control(struct ata_queued_cmd *qc, + const u8 *buf, int len, u16 *fp) +{ + struct ata_device *dev = qc->dev; + u8 mpage[CONTROL_MPAGE_LEN]; + u8 d_sense; + int i; + + /* + * The first two bytes of def_control_mpage are a header, so offsets + * in mpage are off by 2 compared to buf. Same for len. + */ + + if (len != CONTROL_MPAGE_LEN - 2) { + *fp = min(len, CONTROL_MPAGE_LEN - 2); + return -EINVAL; + } + + d_sense = buf[0] & (1 << 2); + + /* + * Check that read-only bits are not modified. + */ + ata_msense_control(dev, mpage, false); + for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) { + if (i == 0) + continue; + if (mpage[2 + i] != buf[i]) { + *fp = i; + return -EINVAL; + } + } + if (d_sense & (1 << 2)) + dev->flags |= ATA_DFLAG_D_SENSE; + else + dev->flags &= ~ATA_DFLAG_D_SENSE; + return 0; +} + +/** + * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands + * @qc: Storage for translated ATA taskfile + * + * Converts a MODE SELECT command to an ATA SET FEATURES taskfile. + * Assume this is invoked for direct access devices (e.g. disks) only. + * There should be no block descriptor for other device types. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + const u8 *cdb = scmd->cmnd; + u8 pg, spg; + unsigned six_byte, pg_len, hdr_len, bd_len; + int len; + u16 fp = (u16)-1; + u8 bp = 0xff; + u8 buffer[64]; + const u8 *p = buffer; + + six_byte = (cdb[0] == MODE_SELECT); + if (six_byte) { + if (scmd->cmd_len < 5) { + fp = 4; + goto invalid_fld; + } + + len = cdb[4]; + hdr_len = 4; + } else { + if (scmd->cmd_len < 9) { + fp = 8; + goto invalid_fld; + } + + len = get_unaligned_be16(&cdb[7]); + hdr_len = 8; + } + + /* We only support PF=1, SP=0. */ + if ((cdb[1] & 0x11) != 0x10) { + fp = 1; + bp = (cdb[1] & 0x01) ? 1 : 5; + goto invalid_fld; + } + + /* Test early for possible overrun. */ + if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len) + goto invalid_param_len; + + /* Move past header and block descriptors. */ + if (len < hdr_len) + goto invalid_param_len; + + if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd), + buffer, sizeof(buffer))) + goto invalid_param_len; + + if (six_byte) + bd_len = p[3]; + else + bd_len = get_unaligned_be16(&p[6]); + + len -= hdr_len; + p += hdr_len; + if (len < bd_len) + goto invalid_param_len; + if (bd_len != 0 && bd_len != 8) { + fp = (six_byte) ? 3 : 6; + fp += bd_len + hdr_len; + goto invalid_param; + } + + len -= bd_len; + p += bd_len; + if (len == 0) + goto skip; + + /* Parse both possible formats for the mode page headers. */ + pg = p[0] & 0x3f; + if (p[0] & 0x40) { + if (len < 4) + goto invalid_param_len; + + spg = p[1]; + pg_len = get_unaligned_be16(&p[2]); + p += 4; + len -= 4; + } else { + if (len < 2) + goto invalid_param_len; + + spg = 0; + pg_len = p[1]; + p += 2; + len -= 2; + } + + /* + * No mode subpages supported (yet) but asking for _all_ + * subpages may be valid + */ + if (spg && (spg != ALL_SUB_MPAGES)) { + fp = (p[0] & 0x40) ? 1 : 0; + fp += hdr_len + bd_len; + goto invalid_param; + } + if (pg_len > len) + goto invalid_param_len; + + switch (pg) { + case CACHE_MPAGE: + if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) { + fp += hdr_len + bd_len; + goto invalid_param; + } + break; + case CONTROL_MPAGE: + if (ata_mselect_control(qc, p, pg_len, &fp) < 0) { + fp += hdr_len + bd_len; + goto invalid_param; + } else { + goto skip; /* No ATA command to send */ + } + break; + default: /* invalid page code */ + fp = bd_len + hdr_len; + goto invalid_param; + } + + /* + * Only one page has changeable data, so we only support setting one + * page at a time. + */ + if (len > pg_len) + goto invalid_param; + + return 0; + + invalid_fld: + ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp); + return 1; + + invalid_param: + ata_scsi_set_invalid_parameter(qc->dev, scmd, fp); + return 1; + + invalid_param_len: + /* "Parameter list length error" */ + ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0); + return 1; + + skip: + scmd->result = SAM_STAT_GOOD; + return 1; +} + +static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma) +{ + if (len == 0) + return ATA_CMD_TRUSTED_NONDATA; + else if (send) + return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND; + else + return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV; +} + +static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + const u8 *cdb = scmd->cmnd; + struct ata_taskfile *tf = &qc->tf; + u8 secp = cdb[1]; + bool send = (cdb[0] == SECURITY_PROTOCOL_OUT); + u16 spsp = get_unaligned_be16(&cdb[2]); + u32 len = get_unaligned_be32(&cdb[6]); + bool dma = !(qc->dev->flags & ATA_DFLAG_PIO); + + /* + * We don't support the ATA "security" protocol. + */ + if (secp == 0xef) { + ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0); + return 1; + } + + if (cdb[4] & 7) { /* INC_512 */ + if (len > 0xffff) { + ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); + return 1; + } + } else { + if (len > 0x01fffe00) { + ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0); + return 1; + } + + /* convert to the sector-based ATA addressing */ + len = (len + 511) / 512; + } + + tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO; + tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA; + if (send) + tf->flags |= ATA_TFLAG_WRITE; + tf->command = ata_scsi_trusted_op(len, send, dma); + tf->feature = secp; + tf->lbam = spsp & 0xff; + tf->lbah = spsp >> 8; + + if (len) { + tf->nsect = len & 0xff; + tf->lbal = len >> 8; + } else { + if (!send) + tf->lbah = (1 << 7); + } + + ata_qc_set_pc_nbytes(qc); + return 0; +} + +/** + * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler + * @qc: Command to be translated + * + * Translate a SCSI variable length CDB to specified commands. + * It checks a service action value in CDB to call corresponding handler. + * + * RETURNS: + * Zero on success, non-zero on failure + * + */ +static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc) +{ + struct scsi_cmnd *scmd = qc->scsicmd; + const u8 *cdb = scmd->cmnd; + const u16 sa = get_unaligned_be16(&cdb[8]); + + /* + * if service action represents a ata pass-thru(32) command, + * then pass it to ata_scsi_pass_thru handler. + */ + if (sa == ATA_32) + return ata_scsi_pass_thru(qc); + + /* unsupported service action */ + return 1; +} + +/** + * ata_get_xlat_func - check if SCSI to ATA translation is possible + * @dev: ATA device + * @cmd: SCSI command opcode to consider + * + * Look up the SCSI command given, and determine whether the + * SCSI command is to be translated or simulated. + * + * RETURNS: + * Pointer to translation function if possible, %NULL if not. + */ + +static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd) +{ + switch (cmd) { + case READ_6: + case READ_10: + case READ_16: + + case WRITE_6: + case WRITE_10: + case WRITE_16: + return ata_scsi_rw_xlat; + + case WRITE_SAME_16: + return ata_scsi_write_same_xlat; + + case SYNCHRONIZE_CACHE: + 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, struct scsi_host_template *sht) +{ + int i, rc; + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + struct Scsi_Host *shost; + + rc = -ENOMEM; + shost = scsi_host_alloc(sht, sizeof(struct ata_port *)); + if (!shost) + goto err_alloc; + + shost->eh_noresume = 1; + *(struct ata_port **)&shost->hostdata[0] = ap; + ap->scsi_host = shost; + + shost->transportt = ata_scsi_transport_template; + shost->unique_id = ap->print_id; + shost->max_id = 16; + shost->max_lun = 1; + shost->max_channel = 1; + shost->max_cmd_len = 32; + + /* Schedule policy is determined by ->qc_defer() + * callback and it needs to see every deferred qc. + * Set host_blocked to 1 to prevent SCSI midlayer from + * automatically deferring requests. + */ + shost->max_host_blocked = 1; + + rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev); + if (rc) + goto err_alloc; + } + + return 0; + + err_alloc: + while (--i >= 0) { + struct Scsi_Host *shost = host->ports[i]->scsi_host; + + /* scsi_host_put() is in ata_devres_release() */ + scsi_remove_host(shost); + } + return rc; +} + +#ifdef CONFIG_OF +static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) +{ + struct scsi_device *sdev = dev->sdev; + struct device *d = ap->host->dev; + struct device_node *np = d->of_node; + struct device_node *child; + + for_each_available_child_of_node(np, child) { + int ret; + u32 val; + + ret = of_property_read_u32(child, "reg", &val); + if (ret) + continue; + if (val == dev->devno) { + dev_dbg(d, "found matching device node\n"); + sdev->sdev_gendev.of_node = child; + return; + } + } +} +#else +static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap) +{ +} +#endif + +void ata_scsi_scan_host(struct ata_port *ap, int sync) +{ + int tries = 5; + struct ata_device *last_failed_dev = NULL; + struct ata_link *link; + struct ata_device *dev; + + repeat: + ata_for_each_link(link, ap, EDGE) { + ata_for_each_dev(dev, link, ENABLED) { + struct scsi_device *sdev; + int channel = 0, id = 0; + + if (dev->sdev) + continue; + + if (ata_is_host_link(link)) + id = dev->devno; + else + channel = link->pmp; + + sdev = __scsi_add_device(ap->scsi_host, channel, id, 0, + NULL); + if (!IS_ERR(sdev)) { + dev->sdev = sdev; + ata_scsi_assign_ofnode(dev, ap); + scsi_device_put(sdev); + } else { + dev->sdev = NULL; + } + } + } + + /* If we scanned while EH was in progress or allocation + * failure occurred, scan would have failed silently. Check + * whether all devices are attached. + */ + ata_for_each_link(link, ap, EDGE) { + ata_for_each_dev(dev, link, ENABLED) { + if (!dev->sdev) + goto exit_loop; + } + } + exit_loop: + if (!link) + return; + + /* we're missing some SCSI devices */ + if (sync) { + /* If caller requested synchrnous scan && we've made + * any progress, sleep briefly and repeat. + */ + if (dev != last_failed_dev) { + msleep(100); + last_failed_dev = dev; + goto repeat; + } + + /* We might be failing to detect boot device, give it + * a few more chances. + */ + if (--tries) { + msleep(100); + goto repeat; + } + + ata_port_err(ap, + "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n"); + } + + queue_delayed_work(system_long_wq, &ap->hotplug_task, + round_jiffies_relative(HZ)); +} + +/** + * ata_scsi_offline_dev - offline attached SCSI device + * @dev: ATA device to offline attached SCSI device for + * + * This function is called from ata_eh_hotplug() and responsible + * for taking the SCSI device attached to @dev offline. This + * function is called with host lock which protects dev->sdev + * against clearing. + * + * LOCKING: + * spin_lock_irqsave(host lock) + * + * RETURNS: + * 1 if attached SCSI device exists, 0 otherwise. + */ +int ata_scsi_offline_dev(struct ata_device *dev) +{ + if (dev->sdev) { + scsi_device_set_state(dev->sdev, SDEV_OFFLINE); + return 1; + } + return 0; +} + +/** + * ata_scsi_remove_dev - remove attached SCSI device + * @dev: ATA device to remove attached SCSI device for + * + * This function is called from ata_eh_scsi_hotplug() and + * responsible for removing the SCSI device attached to @dev. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +static void ata_scsi_remove_dev(struct ata_device *dev) +{ + struct ata_port *ap = dev->link->ap; + struct scsi_device *sdev; + unsigned long flags; + + /* Alas, we need to grab scan_mutex to ensure SCSI device + * state doesn't change underneath us and thus + * scsi_device_get() always succeeds. The mutex locking can + * be removed if there is __scsi_device_get() interface which + * increments reference counts regardless of device state. + */ + mutex_lock(&ap->scsi_host->scan_mutex); + spin_lock_irqsave(ap->lock, flags); + + /* clearing dev->sdev is protected by host lock */ + sdev = dev->sdev; + dev->sdev = NULL; + + if (sdev) { + /* If user initiated unplug races with us, sdev can go + * away underneath us after the host lock and + * scan_mutex are released. Hold onto it. + */ + if (scsi_device_get(sdev) == 0) { + /* The following ensures the attached sdev is + * offline on return from ata_scsi_offline_dev() + * regardless it wins or loses the race + * against this function. + */ + scsi_device_set_state(sdev, SDEV_OFFLINE); + } else { + WARN_ON(1); + sdev = NULL; + } + } + + spin_unlock_irqrestore(ap->lock, flags); + mutex_unlock(&ap->scsi_host->scan_mutex); + + if (sdev) { + ata_dev_info(dev, "detaching (SCSI %s)\n", + dev_name(&sdev->sdev_gendev)); + + scsi_remove_device(sdev); + scsi_device_put(sdev); + } +} + +static void ata_scsi_handle_link_detach(struct ata_link *link) +{ + struct ata_port *ap = link->ap; + struct ata_device *dev; + + ata_for_each_dev(dev, link, ALL) { + unsigned long flags; + + if (!(dev->flags & ATA_DFLAG_DETACHED)) + continue; + + spin_lock_irqsave(ap->lock, flags); + dev->flags &= ~ATA_DFLAG_DETACHED; + spin_unlock_irqrestore(ap->lock, flags); + + if (zpodd_dev_enabled(dev)) + zpodd_exit(dev); + + ata_scsi_remove_dev(dev); + } +} + +/** + * ata_scsi_media_change_notify - send media change event + * @dev: Pointer to the disk device with media change event + * + * Tell the block layer to send a media change notification + * event. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +void ata_scsi_media_change_notify(struct ata_device *dev) +{ + if (dev->sdev) + sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE, + GFP_ATOMIC); +} + +/** + * ata_scsi_hotplug - SCSI part of hotplug + * @work: Pointer to ATA port to perform SCSI hotplug on + * + * Perform SCSI part of hotplug. It's executed from a separate + * workqueue after EH completes. This is necessary because SCSI + * hot plugging requires working EH and hot unplugging is + * synchronized with hot plugging with a mutex. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_scsi_hotplug(struct work_struct *work) +{ + struct ata_port *ap = + container_of(work, struct ata_port, hotplug_task.work); + int i; + + if (ap->pflags & ATA_PFLAG_UNLOADING) + return; + + mutex_lock(&ap->scsi_scan_mutex); + + /* Unplug detached devices. We cannot use link iterator here + * because PMP links have to be scanned even if PMP is + * currently not attached. Iterate manually. + */ + ata_scsi_handle_link_detach(&ap->link); + if (ap->pmp_link) + for (i = 0; i < SATA_PMP_MAX_PORTS; i++) + ata_scsi_handle_link_detach(&ap->pmp_link[i]); + + /* scan for new ones */ + ata_scsi_scan_host(ap, 0); + + mutex_unlock(&ap->scsi_scan_mutex); +} + +/** + * ata_scsi_user_scan - indication for user-initiated bus scan + * @shost: SCSI host to scan + * @channel: Channel to scan + * @id: ID to scan + * @lun: LUN to scan + * + * This function is called when user explicitly requests bus + * scan. Set probe pending flag and invoke EH. + * + * LOCKING: + * SCSI layer (we don't care) + * + * RETURNS: + * Zero. + */ +int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel, + unsigned int id, u64 lun) +{ + struct ata_port *ap = ata_shost_to_port(shost); + unsigned long flags; + int devno, rc = 0; + + if (!ap->ops->error_handler) + return -EOPNOTSUPP; + + if (lun != SCAN_WILD_CARD && lun) + return -EINVAL; + + if (!sata_pmp_attached(ap)) { + if (channel != SCAN_WILD_CARD && channel) + return -EINVAL; + devno = id; + } else { + if (id != SCAN_WILD_CARD && id) + return -EINVAL; + devno = channel; + } + + spin_lock_irqsave(ap->lock, flags); + + if (devno == SCAN_WILD_CARD) { + struct ata_link *link; + + ata_for_each_link(link, ap, EDGE) { + struct ata_eh_info *ehi = &link->eh_info; + ehi->probe_mask |= ATA_ALL_DEVICES; + ehi->action |= ATA_EH_RESET; + } + } else { + struct ata_device *dev = ata_find_dev(ap, devno); + + if (dev) { + struct ata_eh_info *ehi = &dev->link->eh_info; + ehi->probe_mask |= 1 << dev->devno; + ehi->action |= ATA_EH_RESET; + } else + rc = -EINVAL; + } + + if (rc == 0) { + ata_port_schedule_eh(ap); + spin_unlock_irqrestore(ap->lock, flags); + ata_port_wait_eh(ap); + } else + spin_unlock_irqrestore(ap->lock, flags); + + return rc; +} + +/** + * ata_scsi_dev_rescan - initiate scsi_rescan_device() + * @work: Pointer to ATA port to perform scsi_rescan_device() + * + * After ATA pass thru (SAT) commands are executed successfully, + * libata need to propagate the changes to SCSI layer. + * + * LOCKING: + * Kernel thread context (may sleep). + */ +void ata_scsi_dev_rescan(struct work_struct *work) +{ + struct ata_port *ap = + container_of(work, struct ata_port, scsi_rescan_task.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)); +} |