forked from amir73il/linux
/
libata-scsi.c
3160 lines (2707 loc) · 79 KB
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libata-scsi.c
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/*
* libata-scsi.c - helper library for ATA
*
* Maintained by: Jeff Garzik <jgarzik@pobox.com>
* Please ALWAYS copy linux-ide@vger.kernel.org
* on emails.
*
* Copyright 2003-2004 Red Hat, Inc. All rights reserved.
* Copyright 2003-2004 Jeff Garzik
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* libata documentation is available via 'make {ps|pdf}docs',
* as Documentation/DocBook/libata.*
*
* Hardware documentation available from
* - http://www.t10.org/
* - http://www.t13.org/
*
*/
#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_transport.h>
#include <linux/libata.h>
#include <linux/hdreg.h>
#include <asm/uaccess.h>
#include "libata.h"
#define SECTOR_SIZE 512
typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
const struct scsi_device *scsidev);
static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
const struct scsi_device *scsidev);
static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
unsigned int id, unsigned int lun);
#define RW_RECOVERY_MPAGE 0x1
#define RW_RECOVERY_MPAGE_LEN 12
#define CACHE_MPAGE 0x8
#define CACHE_MPAGE_LEN 20
#define CONTROL_MPAGE 0xa
#define CONTROL_MPAGE_LEN 12
#define ALL_MPAGES 0x3f
#define ALL_SUB_MPAGES 0xff
static const u8 def_rw_recovery_mpage[] = {
RW_RECOVERY_MPAGE,
RW_RECOVERY_MPAGE_LEN - 2,
(1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
(1 << 6), /* ARRE (auto read reallocation) */
0, /* read retry count */
0, 0, 0, 0,
0, /* write retry count */
0, 0, 0
};
static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
CACHE_MPAGE,
CACHE_MPAGE_LEN - 2,
0, /* contains WCE, needs to be 0 for logic */
0, 0, 0, 0, 0, 0, 0, 0, 0,
0, /* contains DRA, needs to be 0 for logic */
0, 0, 0, 0, 0, 0, 0
};
static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
CONTROL_MPAGE,
CONTROL_MPAGE_LEN - 2,
2, /* DSENSE=0, GLTSD=1 */
0, /* [QAM+QERR may be 1, see 05-359r1] */
0, 0, 0, 0, 0xff, 0xff,
0, 30 /* extended self test time, see 05-359r1 */
};
/*
* libata transport template. libata doesn't do real transport stuff.
* It just needs the eh_timed_out hook.
*/
struct scsi_transport_template ata_scsi_transport_template = {
.eh_strategy_handler = ata_scsi_error,
.eh_timed_out = ata_scsi_timed_out,
.user_scan = ata_scsi_user_scan,
};
static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
/* "Invalid field in cbd" */
done(cmd);
}
/**
* ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
* @sdev: SCSI device for which BIOS geometry is to be determined
* @bdev: block device associated with @sdev
* @capacity: capacity of SCSI device
* @geom: location to which geometry will be output
*
* Generic bios head/sector/cylinder calculator
* used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
* mapping. Some situations may arise where the disk is not
* bootable if this is not used.
*
* LOCKING:
* Defined by the SCSI layer. We don't really care.
*
* RETURNS:
* Zero.
*/
int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
sector_t capacity, int geom[])
{
geom[0] = 255;
geom[1] = 63;
sector_div(capacity, 255*63);
geom[2] = capacity;
return 0;
}
/**
* ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
* @scsidev: Device to which we are issuing command
* @arg: User provided data for issuing command
*
* LOCKING:
* Defined by the SCSI layer. We don't really care.
*
* RETURNS:
* Zero on success, negative errno on error.
*/
int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
{
int rc = 0;
u8 scsi_cmd[MAX_COMMAND_SIZE];
u8 args[4], *argbuf = NULL;
int argsize = 0;
struct scsi_sense_hdr sshdr;
enum dma_data_direction data_dir;
if (arg == NULL)
return -EINVAL;
if (copy_from_user(args, arg, sizeof(args)))
return -EFAULT;
memset(scsi_cmd, 0, sizeof(scsi_cmd));
if (args[3]) {
argsize = SECTOR_SIZE * args[3];
argbuf = kmalloc(argsize, GFP_KERNEL);
if (argbuf == NULL) {
rc = -ENOMEM;
goto error;
}
scsi_cmd[1] = (4 << 1); /* PIO Data-in */
scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
block count in sector count field */
data_dir = DMA_FROM_DEVICE;
} else {
scsi_cmd[1] = (3 << 1); /* Non-data */
/* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
data_dir = DMA_NONE;
}
scsi_cmd[0] = ATA_16;
scsi_cmd[4] = args[2];
if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
scsi_cmd[6] = args[3];
scsi_cmd[8] = args[1];
scsi_cmd[10] = 0x4f;
scsi_cmd[12] = 0xc2;
} else {
scsi_cmd[6] = args[1];
}
scsi_cmd[14] = args[0];
/* Good values for timeout and retries? Values below
from scsi_ioctl_send_command() for default case... */
if (scsi_execute_req(scsidev, scsi_cmd, data_dir, argbuf, argsize,
&sshdr, (10*HZ), 5)) {
rc = -EIO;
goto error;
}
/* Need code to retrieve data from check condition? */
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 scsi_cmd[MAX_COMMAND_SIZE];
u8 args[7];
struct scsi_sense_hdr sshdr;
if (arg == NULL)
return -EINVAL;
if (copy_from_user(args, arg, sizeof(args)))
return -EFAULT;
memset(scsi_cmd, 0, sizeof(scsi_cmd));
scsi_cmd[0] = ATA_16;
scsi_cmd[1] = (3 << 1); /* Non-data */
/* scsi_cmd[2] is already 0 -- no off.line, cc, 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[14] = args[0];
/* Good values for timeout and retries? Values below
from scsi_ioctl_send_command() for default case... */
if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
(10*HZ), 5))
rc = -EIO;
/* Need code to retrieve data from check condition? */
return rc;
}
int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
{
int val = -EINVAL, rc = -EINVAL;
switch (cmd) {
case ATA_IOC_GET_IO32:
val = 0;
if (copy_to_user(arg, &val, 1))
return -EFAULT;
return 0;
case ATA_IOC_SET_IO32:
val = (unsigned long) arg;
if (val != 0)
return -EINVAL;
return 0;
case HDIO_DRIVE_CMD:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
return ata_cmd_ioctl(scsidev, arg);
case HDIO_DRIVE_TASK:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
return ata_task_ioctl(scsidev, arg);
default:
rc = -ENOTTY;
break;
}
return rc;
}
/**
* ata_scsi_qc_new - acquire new ata_queued_cmd reference
* @dev: ATA device to which the new command is attached
* @cmd: SCSI command that originated this ATA command
* @done: SCSI command completion function
*
* Obtain a reference to an unused ata_queued_cmd structure,
* which is the basic libata structure representing a single
* ATA command sent to the hardware.
*
* If a command was available, fill in the SCSI-specific
* portions of the structure with information on the
* current command.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS:
* Command allocated, or %NULL if none available.
*/
struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{
struct ata_queued_cmd *qc;
qc = ata_qc_new_init(dev);
if (qc) {
qc->scsicmd = cmd;
qc->scsidone = done;
if (cmd->use_sg) {
qc->__sg = (struct scatterlist *) cmd->request_buffer;
qc->n_elem = cmd->use_sg;
} else {
qc->__sg = &qc->sgent;
qc->n_elem = 1;
}
} else {
cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
done(cmd);
}
return qc;
}
/**
* ata_dump_status - user friendly display of error info
* @id: id of the port in question
* @tf: ptr to filled out taskfile
*
* Decode and dump the ATA error/status registers for the user so
* that they have some idea what really happened at the non
* make-believe layer.
*
* LOCKING:
* inherited from caller
*/
void ata_dump_status(unsigned id, struct ata_taskfile *tf)
{
u8 stat = tf->command, err = tf->feature;
printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
if (stat & ATA_BUSY) {
printk("Busy }\n"); /* Data is not valid in this case */
} else {
if (stat & 0x40) printk("DriveReady ");
if (stat & 0x20) printk("DeviceFault ");
if (stat & 0x10) printk("SeekComplete ");
if (stat & 0x08) printk("DataRequest ");
if (stat & 0x04) printk("CorrectedError ");
if (stat & 0x02) printk("Index ");
if (stat & 0x01) printk("Error ");
printk("}\n");
if (err) {
printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
if (err & 0x04) printk("DriveStatusError ");
if (err & 0x80) {
if (err & 0x04) printk("BadCRC ");
else printk("Sector ");
}
if (err & 0x40) printk("UncorrectableError ");
if (err & 0x10) printk("SectorIdNotFound ");
if (err & 0x02) printk("TrackZeroNotFound ");
if (err & 0x01) printk("AddrMarkNotFound ");
printk("}\n");
}
}
}
/**
* ata_scsi_device_suspend - suspend ATA device associated with sdev
* @sdev: the SCSI device to suspend
* @state: target power management state
*
* Request suspend EH action on the ATA device associated with
* @sdev and wait for the operation to complete.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0 on success, -errno otherwise.
*/
int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
unsigned long flags;
unsigned int action;
int rc = 0;
if (!dev)
goto out;
spin_lock_irqsave(ap->lock, flags);
/* wait for the previous resume to complete */
while (dev->flags & ATA_DFLAG_SUSPENDED) {
spin_unlock_irqrestore(ap->lock, flags);
ata_port_wait_eh(ap);
spin_lock_irqsave(ap->lock, flags);
}
/* if @sdev is already detached, nothing to do */
if (sdev->sdev_state == SDEV_OFFLINE ||
sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
goto out_unlock;
/* request suspend */
action = ATA_EH_SUSPEND;
if (state.event != PM_EVENT_SUSPEND)
action |= ATA_EH_PM_FREEZE;
ap->eh_info.dev_action[dev->devno] |= action;
ap->eh_info.flags |= ATA_EHI_QUIET;
ata_port_schedule_eh(ap);
spin_unlock_irqrestore(ap->lock, flags);
/* wait for EH to do the job */
ata_port_wait_eh(ap);
spin_lock_irqsave(ap->lock, flags);
/* If @sdev is still attached but the associated ATA device
* isn't suspended, the operation failed.
*/
if (sdev->sdev_state != SDEV_OFFLINE &&
sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
!(dev->flags & ATA_DFLAG_SUSPENDED))
rc = -EIO;
out_unlock:
spin_unlock_irqrestore(ap->lock, flags);
out:
if (rc == 0)
sdev->sdev_gendev.power.power_state = state;
return rc;
}
/**
* ata_scsi_device_resume - resume ATA device associated with sdev
* @sdev: the SCSI device to resume
*
* Request resume EH action on the ATA device associated with
* @sdev and return immediately. This enables parallel
* wakeup/spinup of devices.
*
* LOCKING:
* Kernel thread context (may sleep).
*
* RETURNS:
* 0.
*/
int ata_scsi_device_resume(struct scsi_device *sdev)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
struct ata_eh_info *ehi = &ap->eh_info;
unsigned long flags;
unsigned int action;
if (!dev)
goto out;
spin_lock_irqsave(ap->lock, flags);
/* if @sdev is already detached, nothing to do */
if (sdev->sdev_state == SDEV_OFFLINE ||
sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
goto out_unlock;
/* request resume */
action = ATA_EH_RESUME;
if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
__ata_ehi_hotplugged(ehi);
else
action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
ehi->dev_action[dev->devno] |= action;
/* We don't want autopsy and verbose EH messages. Disable
* those if we're the only device on this link.
*/
if (ata_port_max_devices(ap) == 1)
ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
ata_port_schedule_eh(ap);
out_unlock:
spin_unlock_irqrestore(ap->lock, flags);
out:
sdev->sdev_gendev.power.power_state = PMSG_ON;
return 0;
}
/**
* ata_to_sense_error - convert ATA error to SCSI error
* @id: ATA device number
* @drv_stat: value contained in ATA status register
* @drv_err: value contained in ATA error register
* @sk: the sense key we'll fill out
* @asc: the additional sense code we'll fill out
* @ascq: the additional sense code qualifier we'll fill out
* @verbose: be verbose
*
* Converts an ATA error into a SCSI error. Fill out pointers to
* SK, ASC, and ASCQ bytes for later use in fixed or descriptor
* format sense blocks.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
u8 *ascq, int verbose)
{
int i;
/* Based on the 3ware driver translation table */
static const unsigned char sense_table[][4] = {
/* BBD|ECC|ID|MAR */
{0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
/* BBD|ECC|ID */
{0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
/* ECC|MC|MARK */
{0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
/* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
{0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
/* MC|ID|ABRT|TRK0|MARK */
{0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
/* MCR|MARK */
{0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
/* Bad address mark */
{0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
/* TRK0 */
{0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
/* Abort & !ICRC */
{0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
/* Media change request */
{0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
/* SRV */
{0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
/* Media change */
{0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
/* ECC */
{0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
/* BBD - block marked bad */
{0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
};
static const unsigned char stat_table[][4] = {
/* Must be first because BUSY means no other bits valid */
{0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
{0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
{0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
{0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
};
/*
* Is this an error we can process/parse
*/
if (drv_stat & ATA_BUSY) {
drv_err = 0; /* Ignore the err bits, they're invalid */
}
if (drv_err) {
/* Look for drv_err */
for (i = 0; sense_table[i][0] != 0xFF; i++) {
/* Look for best matches first */
if ((sense_table[i][0] & drv_err) ==
sense_table[i][0]) {
*sk = sense_table[i][1];
*asc = sense_table[i][2];
*ascq = sense_table[i][3];
goto translate_done;
}
}
/* No immediate match */
if (verbose)
printk(KERN_WARNING "ata%u: no sense translation for "
"error 0x%02x\n", id, drv_err);
}
/* Fall back to interpreting status bits */
for (i = 0; stat_table[i][0] != 0xFF; i++) {
if (stat_table[i][0] & drv_stat) {
*sk = stat_table[i][1];
*asc = stat_table[i][2];
*ascq = stat_table[i][3];
goto translate_done;
}
}
/* No error? Undecoded? */
if (verbose)
printk(KERN_WARNING "ata%u: no sense translation for "
"status: 0x%02x\n", id, drv_stat);
/* We need a sensible error return here, which is tricky, and one
that won't cause people to do things like return a disk wrongly */
*sk = ABORTED_COMMAND;
*asc = 0x00;
*ascq = 0x00;
translate_done:
if (verbose)
printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
"to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
id, drv_stat, drv_err, *sk, *asc, *ascq);
return;
}
/*
* ata_gen_ata_desc_sense - Generate check condition sense block.
* @qc: Command that completed.
*
* This function is specific to the ATA descriptor format sense
* block specified for the ATA pass through commands. Regardless
* of whether the command errored or not, return a sense
* block. Copy all controller registers into the sense
* block. Clear sense key, ASC & ASCQ if there is no error.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
{
struct scsi_cmnd *cmd = qc->scsicmd;
struct ata_taskfile *tf = &qc->result_tf;
unsigned char *sb = cmd->sense_buffer;
unsigned char *desc = sb + 8;
int verbose = qc->ap->ops->error_handler == NULL;
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
/*
* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
if (qc->err_mask ||
tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
&sb[1], &sb[2], &sb[3], verbose);
sb[1] &= 0x0f;
}
/*
* Sense data is current and format is descriptor.
*/
sb[0] = 0x72;
desc[0] = 0x09;
/*
* Set length of additional sense data.
* Since we only populate descriptor 0, the total
* length is the same (fixed) length as descriptor 0.
*/
desc[1] = sb[7] = 14;
/*
* Copy registers into sense buffer.
*/
desc[2] = 0x00;
desc[3] = tf->feature; /* == error reg */
desc[5] = tf->nsect;
desc[7] = tf->lbal;
desc[9] = tf->lbam;
desc[11] = tf->lbah;
desc[12] = tf->device;
desc[13] = tf->command; /* == status reg */
/*
* Fill in Extend bit, and the high order bytes
* if applicable.
*/
if (tf->flags & ATA_TFLAG_LBA48) {
desc[2] |= 0x01;
desc[4] = tf->hob_nsect;
desc[6] = tf->hob_lbal;
desc[8] = tf->hob_lbam;
desc[10] = tf->hob_lbah;
}
}
/**
* ata_gen_fixed_sense - generate a SCSI fixed sense block
* @qc: Command that we are erroring out
*
* Leverage ata_to_sense_error() to give us the codes. Fit our
* LBA in here if there's room.
*
* LOCKING:
* inherited from caller
*/
void ata_gen_fixed_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;
int verbose = qc->ap->ops->error_handler == NULL;
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
/*
* Use ata_to_sense_error() to map status register bits
* onto sense key, asc & ascq.
*/
if (qc->err_mask ||
tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
&sb[2], &sb[12], &sb[13], verbose);
sb[2] &= 0x0f;
}
sb[0] = 0x70;
sb[7] = 0x0a;
if (tf->flags & ATA_TFLAG_LBA48) {
/* TODO: find solution for LBA48 descriptors */
}
else if (tf->flags & ATA_TFLAG_LBA) {
/* A small (28b) LBA will fit in the 32b info field */
sb[0] |= 0x80; /* set valid bit */
sb[3] = tf->device & 0x0f;
sb[4] = tf->lbah;
sb[5] = tf->lbam;
sb[6] = tf->lbal;
}
else {
/* TODO: C/H/S */
}
}
static void ata_scsi_sdev_config(struct scsi_device *sdev)
{
sdev->use_10_for_rw = 1;
sdev->use_10_for_ms = 1;
}
static void ata_scsi_dev_config(struct scsi_device *sdev,
struct ata_device *dev)
{
unsigned int max_sectors;
/* TODO: 2048 is an arbitrary number, not the
* hardware maximum. This should be increased to
* 65534 when Jens Axboe's patch for dynamically
* determining max_sectors is merged.
*/
max_sectors = ATA_MAX_SECTORS;
if (dev->flags & ATA_DFLAG_LBA48)
max_sectors = ATA_MAX_SECTORS_LBA48;
if (dev->max_sectors)
max_sectors = dev->max_sectors;
blk_queue_max_sectors(sdev->request_queue, max_sectors);
/*
* SATA DMA transfers must be multiples of 4 byte, so
* we need to pad ATAPI transfers using an extra sg.
* Decrement max hw segments accordingly.
*/
if (dev->class == ATA_DEV_ATAPI) {
request_queue_t *q = sdev->request_queue;
blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
}
if (dev->flags & ATA_DFLAG_NCQ) {
int depth;
depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
depth = min(ATA_MAX_QUEUE - 1, depth);
scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
}
}
/**
* ata_scsi_slave_config - Set SCSI device attributes
* @sdev: SCSI device to examine
*
* This is called before we actually start reading
* and writing to the device, to configure certain
* SCSI mid-layer behaviors.
*
* LOCKING:
* Defined by SCSI layer. We don't really care.
*/
int ata_scsi_slave_config(struct scsi_device *sdev)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
ata_scsi_sdev_config(sdev);
blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
if (dev)
ata_scsi_dev_config(sdev, dev);
return 0; /* scsi layer doesn't check return value, sigh */
}
/**
* ata_scsi_slave_destroy - SCSI device is about to be destroyed
* @sdev: SCSI device to be destroyed
*
* @sdev is about to be destroyed for hot/warm unplugging. If
* this unplugging was initiated by libata as indicated by NULL
* dev->sdev, this function doesn't have to do anything.
* Otherwise, SCSI layer initiated warm-unplug is in progress.
* Clear dev->sdev, schedule the device for ATA detach and invoke
* EH.
*
* LOCKING:
* Defined by SCSI layer. We don't really care.
*/
void ata_scsi_slave_destroy(struct scsi_device *sdev)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
unsigned long flags;
struct ata_device *dev;
if (!ap->ops->error_handler)
return;
spin_lock_irqsave(ap->lock, flags);
dev = __ata_scsi_find_dev(ap, sdev);
if (dev && dev->sdev) {
/* SCSI device already in CANCEL state, no need to offline it */
dev->sdev = NULL;
dev->flags |= ATA_DFLAG_DETACH;
ata_port_schedule_eh(ap);
}
spin_unlock_irqrestore(ap->lock, flags);
}
/**
* ata_scsi_change_queue_depth - SCSI callback for queue depth config
* @sdev: SCSI device to configure queue depth for
* @queue_depth: new queue depth
*
* This is libata standard hostt->change_queue_depth callback.
* SCSI will call into this callback when user tries to set queue
* depth via sysfs.
*
* LOCKING:
* SCSI layer (we don't care)
*
* RETURNS:
* Newly configured queue depth.
*/
int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
{
struct ata_port *ap = ata_shost_to_port(sdev->host);
struct ata_device *dev;
int max_depth;
if (queue_depth < 1)
return sdev->queue_depth;
dev = ata_scsi_find_dev(ap, sdev);
if (!dev || !ata_dev_enabled(dev))
return sdev->queue_depth;
max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
if (queue_depth > max_depth)
queue_depth = max_depth;
scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
return queue_depth;
}
/**
* ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate
*
* 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_set lock)
*
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
const u8 *scsicmd)
{
struct ata_taskfile *tf = &qc->tf;
tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
tf->protocol = ATA_PROT_NODATA;
if (scsicmd[1] & 0x1) {
; /* ignore IMMED bit, violates sat-r05 */
}
if (scsicmd[4] & 0x2)
goto invalid_fld; /* LOEJ bit set not supported */
if (((scsicmd[4] >> 4) & 0xf) != 0)
goto invalid_fld; /* power conditions not supported */
if (scsicmd[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 {
tf->nsect = 0; /* time period value (0 implies now) */
tf->command = ATA_CMD_STANDBY;
/* Consider: ATA STANDBY IMMEDIATE command */
}
/*
* Standby and Idle condition timers could be implemented but that
* would require libata to implement the Power condition mode page
* and allow the user to change it. Changing mode pages requires
* MODE SELECT to be implemented.
*/
return 0;
invalid_fld:
ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
/* "Invalid field in cbd" */
return 1;
}
/**
* ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
* @qc: Storage for translated ATA taskfile
* @scsicmd: SCSI command to translate (ignored)
*
* Sets up an ATA taskfile to issue FLUSH CACHE or
* FLUSH CACHE EXT.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*
* RETURNS:
* Zero on success, non-zero on error.
*/
static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
{
struct ata_taskfile *tf = &qc->tf;
tf->flags |= ATA_TFLAG_DEVICE;
tf->protocol = ATA_PROT_NODATA;