1597 lines
39 KiB
C
1597 lines
39 KiB
C
/*
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libata-scsi.c - helper library for ATA
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Copyright 2003-2004 Red Hat, Inc. All rights reserved.
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Copyright 2003-2004 Jeff Garzik
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The contents of this file are subject to the Open
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Software License version 1.1 that can be found at
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http://www.opensource.org/licenses/osl-1.1.txt and is included herein
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by reference.
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Alternatively, the contents of this file may be used under the terms
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of the GNU General Public License version 2 (the "GPL") as distributed
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in the kernel source COPYING file, in which case the provisions of
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the GPL are applicable instead of the above. If you wish to allow
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the use of your version of this file only under the terms of the
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GPL and not to allow others to use your version of this file under
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the OSL, indicate your decision by deleting the provisions above and
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replace them with the notice and other provisions required by the GPL.
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If you do not delete the provisions above, a recipient may use your
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version of this file under either the OSL or the GPL.
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*/
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/spinlock.h>
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#include <scsi/scsi.h>
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#include "scsi.h"
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <asm/uaccess.h>
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#include "libata.h"
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typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, u8 *scsicmd);
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static struct ata_device *
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ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev);
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/**
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* ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
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* @sdev: SCSI device for which BIOS geometry is to be determined
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* @bdev: block device associated with @sdev
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* @capacity: capacity of SCSI device
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* @geom: location to which geometry will be output
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*
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* Generic bios head/sector/cylinder calculator
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* used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
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* mapping. Some situations may arise where the disk is not
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* bootable if this is not used.
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*
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* LOCKING:
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* Defined by the SCSI layer. We don't really care.
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*
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* RETURNS:
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* Zero.
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*/
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int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
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sector_t capacity, int geom[])
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{
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geom[0] = 255;
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geom[1] = 63;
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sector_div(capacity, 255*63);
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geom[2] = capacity;
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return 0;
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}
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int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
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{
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struct ata_port *ap;
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struct ata_device *dev;
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int val = -EINVAL, rc = -EINVAL;
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ap = (struct ata_port *) &scsidev->host->hostdata[0];
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if (!ap)
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goto out;
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dev = ata_scsi_find_dev(ap, scsidev);
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if (!dev) {
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rc = -ENODEV;
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goto out;
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}
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switch (cmd) {
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case ATA_IOC_GET_IO32:
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val = 0;
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if (copy_to_user(arg, &val, 1))
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return -EFAULT;
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return 0;
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case ATA_IOC_SET_IO32:
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val = (unsigned long) arg;
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if (val != 0)
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return -EINVAL;
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return 0;
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default:
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rc = -ENOTTY;
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break;
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}
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out:
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return rc;
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}
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/**
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* ata_scsi_qc_new - acquire new ata_queued_cmd reference
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* @ap: ATA port to which the new command is attached
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* @dev: ATA device to which the new command is attached
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* @cmd: SCSI command that originated this ATA command
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* @done: SCSI command completion function
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*
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* Obtain a reference to an unused ata_queued_cmd structure,
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* which is the basic libata structure representing a single
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* ATA command sent to the hardware.
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*
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* If a command was available, fill in the SCSI-specific
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* portions of the structure with information on the
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* current command.
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*
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* LOCKING:
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* spin_lock_irqsave(host_set lock)
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*
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* RETURNS:
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* Command allocated, or %NULL if none available.
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*/
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struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
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struct ata_device *dev,
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struct scsi_cmnd *cmd,
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void (*done)(struct scsi_cmnd *))
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{
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struct ata_queued_cmd *qc;
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qc = ata_qc_new_init(ap, dev);
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if (qc) {
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qc->scsicmd = cmd;
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qc->scsidone = done;
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if (cmd->use_sg) {
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qc->sg = (struct scatterlist *) cmd->request_buffer;
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qc->n_elem = cmd->use_sg;
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} else {
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qc->sg = &qc->sgent;
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qc->n_elem = 1;
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}
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} else {
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cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
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done(cmd);
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}
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return qc;
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}
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/**
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* ata_to_sense_error - convert ATA error to SCSI error
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* @qc: Command that we are erroring out
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* @drv_stat: value contained in ATA status register
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*
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* Converts an ATA error into a SCSI error. While we are at it
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* we decode and dump the ATA error for the user so that they
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* have some idea what really happened at the non make-believe
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* layer.
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*
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* LOCKING:
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* spin_lock_irqsave(host_set lock)
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*/
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void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat)
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{
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struct scsi_cmnd *cmd = qc->scsicmd;
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u8 err = 0;
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unsigned char *sb = cmd->sense_buffer;
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/* Based on the 3ware driver translation table */
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static unsigned char sense_table[][4] = {
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/* BBD|ECC|ID|MAR */
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{0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
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/* BBD|ECC|ID */
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{0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
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/* ECC|MC|MARK */
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{0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
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/* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
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{0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
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/* MC|ID|ABRT|TRK0|MARK */
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{0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
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/* MCR|MARK */
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{0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
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/* Bad address mark */
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{0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
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/* TRK0 */
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{0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
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/* Abort & !ICRC */
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{0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
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/* Media change request */
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{0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
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/* SRV */
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{0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
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/* Media change */
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{0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
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/* ECC */
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{0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
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/* BBD - block marked bad */
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{0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
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{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
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};
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static unsigned char stat_table[][4] = {
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/* Must be first because BUSY means no other bits valid */
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{0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
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{0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
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{0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
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{0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
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{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
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};
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int i = 0;
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cmd->result = SAM_STAT_CHECK_CONDITION;
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/*
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* Is this an error we can process/parse
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*/
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if(drv_stat & ATA_ERR)
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/* Read the err bits */
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err = ata_chk_err(qc->ap);
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/* Display the ATA level error info */
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printk(KERN_WARNING "ata%u: status=0x%02x { ", qc->ap->id, drv_stat);
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if(drv_stat & 0x80)
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{
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printk("Busy ");
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err = 0; /* Data is not valid in this case */
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}
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else {
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if(drv_stat & 0x40) printk("DriveReady ");
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if(drv_stat & 0x20) printk("DeviceFault ");
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if(drv_stat & 0x10) printk("SeekComplete ");
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if(drv_stat & 0x08) printk("DataRequest ");
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if(drv_stat & 0x04) printk("CorrectedError ");
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if(drv_stat & 0x02) printk("Index ");
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if(drv_stat & 0x01) printk("Error ");
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}
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printk("}\n");
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if(err)
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{
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printk(KERN_WARNING "ata%u: error=0x%02x { ", qc->ap->id, err);
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if(err & 0x04) printk("DriveStatusError ");
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if(err & 0x80)
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{
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if(err & 0x04)
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printk("BadCRC ");
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else
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printk("Sector ");
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}
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if(err & 0x40) printk("UncorrectableError ");
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if(err & 0x10) printk("SectorIdNotFound ");
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if(err & 0x02) printk("TrackZeroNotFound ");
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if(err & 0x01) printk("AddrMarkNotFound ");
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printk("}\n");
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/* Should we dump sector info here too ?? */
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}
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/* Look for err */
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while(sense_table[i][0] != 0xFF)
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{
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/* Look for best matches first */
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if((sense_table[i][0] & err) == sense_table[i][0])
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{
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sb[0] = 0x70;
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sb[2] = sense_table[i][1];
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sb[7] = 0x0a;
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sb[12] = sense_table[i][2];
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sb[13] = sense_table[i][3];
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return;
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}
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i++;
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}
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/* No immediate match */
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if(err)
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printk(KERN_DEBUG "ata%u: no sense translation for 0x%02x\n", qc->ap->id, err);
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i = 0;
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/* Fall back to interpreting status bits */
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while(stat_table[i][0] != 0xFF)
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{
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if(stat_table[i][0] & drv_stat)
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{
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sb[0] = 0x70;
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sb[2] = stat_table[i][1];
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sb[7] = 0x0a;
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sb[12] = stat_table[i][2];
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sb[13] = stat_table[i][3];
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return;
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}
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i++;
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}
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/* No error ?? */
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printk(KERN_ERR "ata%u: called with no error (%02X)!\n", qc->ap->id, drv_stat);
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/* additional-sense-code[-qualifier] */
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sb[0] = 0x70;
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sb[2] = MEDIUM_ERROR;
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sb[7] = 0x0A;
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if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
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sb[12] = 0x11; /* "unrecovered read error" */
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sb[13] = 0x04;
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} else {
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sb[12] = 0x0C; /* "write error - */
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sb[13] = 0x02; /* auto-reallocation failed" */
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}
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}
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/**
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* ata_scsi_slave_config - Set SCSI device attributes
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* @sdev: SCSI device to examine
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*
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* This is called before we actually start reading
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* and writing to the device, to configure certain
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* SCSI mid-layer behaviors.
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*
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* LOCKING:
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* Defined by SCSI layer. We don't really care.
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*/
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int ata_scsi_slave_config(struct scsi_device *sdev)
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{
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sdev->use_10_for_rw = 1;
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sdev->use_10_for_ms = 1;
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blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
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if (sdev->id < ATA_MAX_DEVICES) {
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struct ata_port *ap;
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struct ata_device *dev;
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ap = (struct ata_port *) &sdev->host->hostdata[0];
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dev = &ap->device[sdev->id];
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/* TODO: 1024 is an arbitrary number, not the
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* hardware maximum. This should be increased to
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* 65534 when Jens Axboe's patch for dynamically
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* determining max_sectors is merged.
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*/
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if ((dev->flags & ATA_DFLAG_LBA48) &&
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((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
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/*
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* do not overwrite sdev->host->max_sectors, since
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* other drives on this host may not support LBA48
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*/
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blk_queue_max_sectors(sdev->request_queue, 2048);
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}
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}
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return 0; /* scsi layer doesn't check return value, sigh */
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}
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/**
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* ata_scsi_error - SCSI layer error handler callback
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* @host: SCSI host on which error occurred
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*
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* Handles SCSI-layer-thrown error events.
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*
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* LOCKING:
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* Inherited from SCSI layer (none, can sleep)
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*
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* RETURNS:
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* Zero.
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*/
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int ata_scsi_error(struct Scsi_Host *host)
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{
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struct ata_port *ap;
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DPRINTK("ENTER\n");
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ap = (struct ata_port *) &host->hostdata[0];
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ap->ops->eng_timeout(ap);
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/* TODO: this is per-command; when queueing is supported
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* this code will either change or move to a more
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* appropriate place
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*/
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host->host_failed--;
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DPRINTK("EXIT\n");
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return 0;
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}
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/**
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* ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
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* @qc: Storage for translated ATA taskfile
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* @scsicmd: SCSI command to translate (ignored)
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*
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* Sets up an ATA taskfile to issue FLUSH CACHE or
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* FLUSH CACHE EXT.
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*
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* LOCKING:
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* spin_lock_irqsave(host_set lock)
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*
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* RETURNS:
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* Zero on success, non-zero on error.
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*/
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static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
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{
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struct ata_taskfile *tf = &qc->tf;
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tf->flags |= ATA_TFLAG_DEVICE;
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tf->protocol = ATA_PROT_NODATA;
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if ((tf->flags & ATA_TFLAG_LBA48) &&
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(ata_id_has_flush_ext(qc->dev->id)))
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tf->command = ATA_CMD_FLUSH_EXT;
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else
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tf->command = ATA_CMD_FLUSH;
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return 0;
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}
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/**
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* ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
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* @qc: Storage for translated ATA taskfile
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* @scsicmd: SCSI command to translate
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*
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* Converts SCSI VERIFY command to an ATA READ VERIFY command.
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*
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* LOCKING:
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* spin_lock_irqsave(host_set lock)
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*
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* RETURNS:
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* Zero on success, non-zero on error.
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*/
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static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
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{
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struct ata_taskfile *tf = &qc->tf;
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unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
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u64 dev_sectors = qc->dev->n_sectors;
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u64 sect = 0;
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u32 n_sect = 0;
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tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
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tf->protocol = ATA_PROT_NODATA;
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tf->device |= ATA_LBA;
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if (scsicmd[0] == VERIFY) {
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sect |= ((u64)scsicmd[2]) << 24;
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sect |= ((u64)scsicmd[3]) << 16;
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sect |= ((u64)scsicmd[4]) << 8;
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sect |= ((u64)scsicmd[5]);
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n_sect |= ((u32)scsicmd[7]) << 8;
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n_sect |= ((u32)scsicmd[8]);
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}
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else if (scsicmd[0] == VERIFY_16) {
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sect |= ((u64)scsicmd[2]) << 56;
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sect |= ((u64)scsicmd[3]) << 48;
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sect |= ((u64)scsicmd[4]) << 40;
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sect |= ((u64)scsicmd[5]) << 32;
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sect |= ((u64)scsicmd[6]) << 24;
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sect |= ((u64)scsicmd[7]) << 16;
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sect |= ((u64)scsicmd[8]) << 8;
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sect |= ((u64)scsicmd[9]);
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n_sect |= ((u32)scsicmd[10]) << 24;
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n_sect |= ((u32)scsicmd[11]) << 16;
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n_sect |= ((u32)scsicmd[12]) << 8;
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n_sect |= ((u32)scsicmd[13]);
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}
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else
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return 1;
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|
|
if (!n_sect)
|
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return 1;
|
|
if (sect >= dev_sectors)
|
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return 1;
|
|
if ((sect + n_sect) > dev_sectors)
|
|
return 1;
|
|
if (lba48) {
|
|
if (n_sect > (64 * 1024))
|
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return 1;
|
|
} else {
|
|
if (n_sect > 256)
|
|
return 1;
|
|
}
|
|
|
|
if (lba48) {
|
|
tf->command = ATA_CMD_VERIFY_EXT;
|
|
|
|
tf->hob_nsect = (n_sect >> 8) & 0xff;
|
|
|
|
tf->hob_lbah = (sect >> 40) & 0xff;
|
|
tf->hob_lbam = (sect >> 32) & 0xff;
|
|
tf->hob_lbal = (sect >> 24) & 0xff;
|
|
} else {
|
|
tf->command = ATA_CMD_VERIFY;
|
|
|
|
tf->device |= (sect >> 24) & 0xf;
|
|
}
|
|
|
|
tf->nsect = n_sect & 0xff;
|
|
|
|
tf->lbah = (sect >> 16) & 0xff;
|
|
tf->lbam = (sect >> 8) & 0xff;
|
|
tf->lbal = sect & 0xff;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
|
|
* @qc: Storage for translated ATA taskfile
|
|
* @scsicmd: SCSI command to translate
|
|
*
|
|
* 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_set lock)
|
|
*
|
|
* RETURNS:
|
|
* Zero on success, non-zero on error.
|
|
*/
|
|
|
|
static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
|
|
{
|
|
struct ata_taskfile *tf = &qc->tf;
|
|
unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
|
|
|
|
tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
|
|
tf->protocol = qc->dev->xfer_protocol;
|
|
tf->device |= ATA_LBA;
|
|
|
|
if (scsicmd[0] == READ_10 || scsicmd[0] == READ_6 ||
|
|
scsicmd[0] == READ_16) {
|
|
tf->command = qc->dev->read_cmd;
|
|
} else {
|
|
tf->command = qc->dev->write_cmd;
|
|
tf->flags |= ATA_TFLAG_WRITE;
|
|
}
|
|
|
|
if (scsicmd[0] == READ_10 || scsicmd[0] == WRITE_10) {
|
|
if (lba48) {
|
|
tf->hob_nsect = scsicmd[7];
|
|
tf->hob_lbal = scsicmd[2];
|
|
|
|
qc->nsect = ((unsigned int)scsicmd[7] << 8) |
|
|
scsicmd[8];
|
|
} else {
|
|
/* if we don't support LBA48 addressing, the request
|
|
* -may- be too large. */
|
|
if ((scsicmd[2] & 0xf0) || scsicmd[7])
|
|
return 1;
|
|
|
|
/* stores LBA27:24 in lower 4 bits of device reg */
|
|
tf->device |= scsicmd[2];
|
|
|
|
qc->nsect = scsicmd[8];
|
|
}
|
|
|
|
tf->nsect = scsicmd[8];
|
|
tf->lbal = scsicmd[5];
|
|
tf->lbam = scsicmd[4];
|
|
tf->lbah = scsicmd[3];
|
|
|
|
VPRINTK("ten-byte command\n");
|
|
return 0;
|
|
}
|
|
|
|
if (scsicmd[0] == READ_6 || scsicmd[0] == WRITE_6) {
|
|
qc->nsect = tf->nsect = scsicmd[4];
|
|
tf->lbal = scsicmd[3];
|
|
tf->lbam = scsicmd[2];
|
|
tf->lbah = scsicmd[1] & 0x1f; /* mask out reserved bits */
|
|
|
|
VPRINTK("six-byte command\n");
|
|
return 0;
|
|
}
|
|
|
|
if (scsicmd[0] == READ_16 || scsicmd[0] == WRITE_16) {
|
|
/* rule out impossible LBAs and sector counts */
|
|
if (scsicmd[2] || scsicmd[3] || scsicmd[10] || scsicmd[11])
|
|
return 1;
|
|
|
|
if (lba48) {
|
|
tf->hob_nsect = scsicmd[12];
|
|
tf->hob_lbal = scsicmd[6];
|
|
tf->hob_lbam = scsicmd[5];
|
|
tf->hob_lbah = scsicmd[4];
|
|
|
|
qc->nsect = ((unsigned int)scsicmd[12] << 8) |
|
|
scsicmd[13];
|
|
} else {
|
|
/* once again, filter out impossible non-zero values */
|
|
if (scsicmd[4] || scsicmd[5] || scsicmd[12] ||
|
|
(scsicmd[6] & 0xf0))
|
|
return 1;
|
|
|
|
/* stores LBA27:24 in lower 4 bits of device reg */
|
|
tf->device |= scsicmd[6];
|
|
|
|
qc->nsect = scsicmd[13];
|
|
}
|
|
|
|
tf->nsect = scsicmd[13];
|
|
tf->lbal = scsicmd[9];
|
|
tf->lbam = scsicmd[8];
|
|
tf->lbah = scsicmd[7];
|
|
|
|
VPRINTK("sixteen-byte command\n");
|
|
return 0;
|
|
}
|
|
|
|
DPRINTK("no-byte command\n");
|
|
return 1;
|
|
}
|
|
|
|
static int ata_scsi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
|
|
{
|
|
struct scsi_cmnd *cmd = qc->scsicmd;
|
|
|
|
if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ)))
|
|
ata_to_sense_error(qc, drv_stat);
|
|
else
|
|
cmd->result = SAM_STAT_GOOD;
|
|
|
|
qc->scsidone(cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_translate - Translate then issue SCSI command to ATA device
|
|
* @ap: ATA port to which the command is addressed
|
|
* @dev: ATA device to which the command is addressed
|
|
* @cmd: SCSI command to execute
|
|
* @done: SCSI command completion function
|
|
* @xlat_func: Actor which translates @cmd to an ATA taskfile
|
|
*
|
|
* Our ->queuecommand() function has decided that the SCSI
|
|
* command issued can be directly translated into an ATA
|
|
* command, rather than handled internally.
|
|
*
|
|
* This function sets up an ata_queued_cmd structure for the
|
|
* SCSI command, and sends that ata_queued_cmd to the hardware.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
|
|
struct scsi_cmnd *cmd,
|
|
void (*done)(struct scsi_cmnd *),
|
|
ata_xlat_func_t xlat_func)
|
|
{
|
|
struct ata_queued_cmd *qc;
|
|
u8 *scsicmd = cmd->cmnd;
|
|
|
|
VPRINTK("ENTER\n");
|
|
|
|
qc = ata_scsi_qc_new(ap, dev, cmd, done);
|
|
if (!qc)
|
|
return;
|
|
|
|
/* data is present; dma-map it */
|
|
if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
|
|
cmd->sc_data_direction == DMA_TO_DEVICE) {
|
|
if (unlikely(cmd->request_bufflen < 1)) {
|
|
printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
|
|
ap->id, dev->devno);
|
|
goto err_out;
|
|
}
|
|
|
|
if (cmd->use_sg)
|
|
ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
|
|
else
|
|
ata_sg_init_one(qc, cmd->request_buffer,
|
|
cmd->request_bufflen);
|
|
|
|
qc->dma_dir = cmd->sc_data_direction;
|
|
}
|
|
|
|
qc->complete_fn = ata_scsi_qc_complete;
|
|
|
|
if (xlat_func(qc, scsicmd))
|
|
goto err_out;
|
|
|
|
/* select device, send command to hardware */
|
|
if (ata_qc_issue(qc))
|
|
goto err_out;
|
|
|
|
VPRINTK("EXIT\n");
|
|
return;
|
|
|
|
err_out:
|
|
ata_qc_free(qc);
|
|
ata_bad_cdb(cmd, done);
|
|
DPRINTK("EXIT - badcmd\n");
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_rbuf_get - Map response buffer.
|
|
* @cmd: SCSI command containing buffer to be mapped.
|
|
* @buf_out: Pointer to mapped area.
|
|
*
|
|
* Maps buffer contained within SCSI command @cmd.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*
|
|
* RETURNS:
|
|
* Length of response buffer.
|
|
*/
|
|
|
|
static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
|
|
{
|
|
u8 *buf;
|
|
unsigned int buflen;
|
|
|
|
if (cmd->use_sg) {
|
|
struct scatterlist *sg;
|
|
|
|
sg = (struct scatterlist *) cmd->request_buffer;
|
|
buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
|
|
buflen = sg->length;
|
|
} else {
|
|
buf = cmd->request_buffer;
|
|
buflen = cmd->request_bufflen;
|
|
}
|
|
|
|
*buf_out = buf;
|
|
return buflen;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_rbuf_put - Unmap response buffer.
|
|
* @cmd: SCSI command containing buffer to be unmapped.
|
|
* @buf: buffer to unmap
|
|
*
|
|
* Unmaps response buffer contained within @cmd.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
|
|
{
|
|
if (cmd->use_sg) {
|
|
struct scatterlist *sg;
|
|
|
|
sg = (struct scatterlist *) cmd->request_buffer;
|
|
kunmap_atomic(buf - sg->offset, KM_USER0);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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, or not.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
|
|
unsigned int (*actor) (struct ata_scsi_args *args,
|
|
u8 *rbuf, unsigned int buflen))
|
|
{
|
|
u8 *rbuf;
|
|
unsigned int buflen, rc;
|
|
struct scsi_cmnd *cmd = args->cmd;
|
|
|
|
buflen = ata_scsi_rbuf_get(cmd, &rbuf);
|
|
memset(rbuf, 0, buflen);
|
|
rc = actor(args, rbuf, buflen);
|
|
ata_scsi_rbuf_put(cmd, rbuf);
|
|
|
|
if (rc)
|
|
ata_bad_cdb(cmd, args->done);
|
|
else {
|
|
cmd->result = SAM_STAT_GOOD;
|
|
args->done(cmd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_inq_std - Simulate INQUIRY command
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Returns standard device identification data associated
|
|
* with non-EVPD INQUIRY command output.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
u8 hdr[] = {
|
|
TYPE_DISK,
|
|
0,
|
|
0x5, /* claim SPC-3 version compatibility */
|
|
2,
|
|
95 - 4
|
|
};
|
|
|
|
/* set scsi removeable (RMB) bit per ata bit */
|
|
if (ata_id_removeable(args->id))
|
|
hdr[1] |= (1 << 7);
|
|
|
|
VPRINTK("ENTER\n");
|
|
|
|
memcpy(rbuf, hdr, sizeof(hdr));
|
|
|
|
if (buflen > 35) {
|
|
memcpy(&rbuf[8], "ATA ", 8);
|
|
ata_dev_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
|
|
ata_dev_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
|
|
if (rbuf[32] == 0 || rbuf[32] == ' ')
|
|
memcpy(&rbuf[32], "n/a ", 4);
|
|
}
|
|
|
|
if (buflen > 63) {
|
|
const u8 versions[] = {
|
|
0x60, /* SAM-3 (no version claimed) */
|
|
|
|
0x03,
|
|
0x20, /* SBC-2 (no version claimed) */
|
|
|
|
0x02,
|
|
0x60 /* SPC-3 (no version claimed) */
|
|
};
|
|
|
|
memcpy(rbuf + 59, versions, sizeof(versions));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_inq_00 - Simulate INQUIRY EVPD page 0, list of pages
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Returns list of inquiry EVPD pages available.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
const u8 pages[] = {
|
|
0x00, /* page 0x00, this page */
|
|
0x80, /* page 0x80, unit serial no page */
|
|
0x83 /* page 0x83, device ident page */
|
|
};
|
|
rbuf[3] = sizeof(pages); /* number of supported EVPD pages */
|
|
|
|
if (buflen > 6)
|
|
memcpy(rbuf + 4, pages, sizeof(pages));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_inq_80 - Simulate INQUIRY EVPD page 80, device serial number
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Returns ATA device serial number.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
const u8 hdr[] = {
|
|
0,
|
|
0x80, /* this page code */
|
|
0,
|
|
ATA_SERNO_LEN, /* page len */
|
|
};
|
|
memcpy(rbuf, hdr, sizeof(hdr));
|
|
|
|
if (buflen > (ATA_SERNO_LEN + 4 - 1))
|
|
ata_dev_id_string(args->id, (unsigned char *) &rbuf[4],
|
|
ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char *inq_83_str = "Linux ATA-SCSI simulator";
|
|
|
|
/**
|
|
* ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Returns device identification. Currently hardcoded to
|
|
* return "Linux ATA-SCSI simulator".
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
rbuf[1] = 0x83; /* this page code */
|
|
rbuf[3] = 4 + strlen(inq_83_str); /* page len */
|
|
|
|
/* our one and only identification descriptor (vendor-specific) */
|
|
if (buflen > (strlen(inq_83_str) + 4 + 4 - 1)) {
|
|
rbuf[4 + 0] = 2; /* code set: ASCII */
|
|
rbuf[4 + 3] = strlen(inq_83_str);
|
|
memcpy(rbuf + 4 + 4, inq_83_str, strlen(inq_83_str));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_noop - Command handler that simply returns success.
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* No operation. Simply returns success to caller, to indicate
|
|
* that the caller should successfully complete this SCSI command.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
VPRINTK("ENTER\n");
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_msense_push - Push data onto MODE SENSE data output buffer
|
|
* @ptr_io: (input/output) Location to store more output data
|
|
* @last: End of output data buffer
|
|
* @buf: Pointer to BLOB being added to output buffer
|
|
* @buflen: Length of BLOB
|
|
*
|
|
* Store MODE SENSE data on an output buffer.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
|
|
static void ata_msense_push(u8 **ptr_io, const u8 *last,
|
|
const u8 *buf, unsigned int buflen)
|
|
{
|
|
u8 *ptr = *ptr_io;
|
|
|
|
if ((ptr + buflen - 1) > last)
|
|
return;
|
|
|
|
memcpy(ptr, buf, buflen);
|
|
|
|
ptr += buflen;
|
|
|
|
*ptr_io = ptr;
|
|
}
|
|
|
|
/**
|
|
* ata_msense_caching - Simulate MODE SENSE caching info page
|
|
* @id: device IDENTIFY data
|
|
* @ptr_io: (input/output) Location to store more output data
|
|
* @last: End of output data buffer
|
|
*
|
|
* Generate a caching info page, which conditionally indicates
|
|
* write caching to the SCSI layer, depending on device
|
|
* capabilities.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
|
|
static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
|
|
const u8 *last)
|
|
{
|
|
u8 page[] = {
|
|
0x8, /* page code */
|
|
0x12, /* page length */
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 10 zeroes */
|
|
0, 0, 0, 0, 0, 0, 0, 0 /* 8 zeroes */
|
|
};
|
|
|
|
if (ata_id_wcache_enabled(id))
|
|
page[2] |= (1 << 2); /* write cache enable */
|
|
if (!ata_id_rahead_enabled(id))
|
|
page[12] |= (1 << 5); /* disable read ahead */
|
|
|
|
ata_msense_push(ptr_io, last, page, sizeof(page));
|
|
return sizeof(page);
|
|
}
|
|
|
|
/**
|
|
* ata_msense_ctl_mode - Simulate MODE SENSE control mode page
|
|
* @dev: Device associated with this MODE SENSE command
|
|
* @ptr_io: (input/output) Location to store more output data
|
|
* @last: End of output data buffer
|
|
*
|
|
* Generate a generic MODE SENSE control mode page.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
|
|
static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
|
|
{
|
|
const u8 page[] = {0xa, 0xa, 6, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 30};
|
|
|
|
/* byte 2: set the descriptor format sense data bit (bit 2)
|
|
* since we need to support returning this format for SAT
|
|
* commands and any SCSI commands against a 48b LBA device.
|
|
*/
|
|
|
|
ata_msense_push(ptr_io, last, page, sizeof(page));
|
|
return sizeof(page);
|
|
}
|
|
|
|
/**
|
|
* ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
|
|
* @dev: Device associated with this MODE SENSE command
|
|
* @ptr_io: (input/output) Location to store more output data
|
|
* @last: End of output data buffer
|
|
*
|
|
* Generate a generic MODE SENSE r/w error recovery page.
|
|
*
|
|
* LOCKING:
|
|
* None.
|
|
*/
|
|
|
|
static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
|
|
{
|
|
const u8 page[] = {
|
|
0x1, /* page code */
|
|
0xa, /* page length */
|
|
(1 << 7) | (1 << 6), /* note auto r/w reallocation */
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0 /* 9 zeroes */
|
|
};
|
|
|
|
ata_msense_push(ptr_io, last, page, sizeof(page));
|
|
return sizeof(page);
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Simulate MODE SENSE commands.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
u8 *scsicmd = args->cmd->cmnd, *p, *last;
|
|
unsigned int page_control, six_byte, output_len;
|
|
|
|
VPRINTK("ENTER\n");
|
|
|
|
six_byte = (scsicmd[0] == MODE_SENSE);
|
|
|
|
/* we only support saved and current values (which we treat
|
|
* in the same manner)
|
|
*/
|
|
page_control = scsicmd[2] >> 6;
|
|
if ((page_control != 0) && (page_control != 3))
|
|
return 1;
|
|
|
|
if (six_byte)
|
|
output_len = 4;
|
|
else
|
|
output_len = 8;
|
|
|
|
p = rbuf + output_len;
|
|
last = rbuf + buflen - 1;
|
|
|
|
switch(scsicmd[2] & 0x3f) {
|
|
case 0x01: /* r/w error recovery */
|
|
output_len += ata_msense_rw_recovery(&p, last);
|
|
break;
|
|
|
|
case 0x08: /* caching */
|
|
output_len += ata_msense_caching(args->id, &p, last);
|
|
break;
|
|
|
|
case 0x0a: { /* control mode */
|
|
output_len += ata_msense_ctl_mode(&p, last);
|
|
break;
|
|
}
|
|
|
|
case 0x3f: /* all pages */
|
|
output_len += ata_msense_rw_recovery(&p, last);
|
|
output_len += ata_msense_caching(args->id, &p, last);
|
|
output_len += ata_msense_ctl_mode(&p, last);
|
|
break;
|
|
|
|
default: /* invalid page code */
|
|
return 1;
|
|
}
|
|
|
|
if (six_byte) {
|
|
output_len--;
|
|
rbuf[0] = output_len;
|
|
} else {
|
|
output_len -= 2;
|
|
rbuf[0] = output_len >> 8;
|
|
rbuf[1] = output_len;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Simulate READ CAPACITY commands.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
u64 n_sectors;
|
|
u32 tmp;
|
|
|
|
VPRINTK("ENTER\n");
|
|
|
|
if (ata_id_has_lba48(args->id))
|
|
n_sectors = ata_id_u64(args->id, 100);
|
|
else
|
|
n_sectors = ata_id_u32(args->id, 60);
|
|
n_sectors--; /* ATA TotalUserSectors - 1 */
|
|
|
|
tmp = n_sectors; /* note: truncates, if lba48 */
|
|
if (args->cmd->cmnd[0] == READ_CAPACITY) {
|
|
/* sector count, 32-bit */
|
|
rbuf[0] = tmp >> (8 * 3);
|
|
rbuf[1] = tmp >> (8 * 2);
|
|
rbuf[2] = tmp >> (8 * 1);
|
|
rbuf[3] = tmp;
|
|
|
|
/* sector size */
|
|
tmp = ATA_SECT_SIZE;
|
|
rbuf[6] = tmp >> 8;
|
|
rbuf[7] = tmp;
|
|
|
|
} else {
|
|
/* sector count, 64-bit */
|
|
rbuf[2] = n_sectors >> (8 * 7);
|
|
rbuf[3] = n_sectors >> (8 * 6);
|
|
rbuf[4] = n_sectors >> (8 * 5);
|
|
rbuf[5] = n_sectors >> (8 * 4);
|
|
rbuf[6] = tmp >> (8 * 3);
|
|
rbuf[7] = tmp >> (8 * 2);
|
|
rbuf[8] = tmp >> (8 * 1);
|
|
rbuf[9] = tmp;
|
|
|
|
/* sector size */
|
|
tmp = ATA_SECT_SIZE;
|
|
rbuf[12] = tmp >> 8;
|
|
rbuf[13] = tmp;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsiop_report_luns - Simulate REPORT LUNS command
|
|
* @args: device IDENTIFY data / SCSI command of interest.
|
|
* @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
|
|
* @buflen: Response buffer length.
|
|
*
|
|
* Simulate REPORT LUNS command.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
|
|
unsigned int buflen)
|
|
{
|
|
VPRINTK("ENTER\n");
|
|
rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_badcmd - End a SCSI request with an error
|
|
* @cmd: SCSI request to be handled
|
|
* @done: SCSI command completion function
|
|
* @asc: SCSI-defined additional sense code
|
|
* @ascq: SCSI-defined additional sense code qualifier
|
|
*
|
|
* Helper function that completes a SCSI command with
|
|
* %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
|
|
* and the specified additional sense codes.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
|
|
{
|
|
DPRINTK("ENTER\n");
|
|
cmd->result = SAM_STAT_CHECK_CONDITION;
|
|
|
|
cmd->sense_buffer[0] = 0x70;
|
|
cmd->sense_buffer[2] = ILLEGAL_REQUEST;
|
|
cmd->sense_buffer[7] = 14 - 8; /* addnl. sense len. FIXME: correct? */
|
|
cmd->sense_buffer[12] = asc;
|
|
cmd->sense_buffer[13] = ascq;
|
|
|
|
done(cmd);
|
|
}
|
|
|
|
static int atapi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
|
|
{
|
|
struct scsi_cmnd *cmd = qc->scsicmd;
|
|
|
|
if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ))) {
|
|
DPRINTK("request check condition\n");
|
|
|
|
cmd->result = SAM_STAT_CHECK_CONDITION;
|
|
|
|
qc->scsidone(cmd);
|
|
|
|
return 1;
|
|
} else {
|
|
u8 *scsicmd = cmd->cmnd;
|
|
|
|
if (scsicmd[0] == INQUIRY) {
|
|
u8 *buf = NULL;
|
|
unsigned int buflen;
|
|
|
|
buflen = ata_scsi_rbuf_get(cmd, &buf);
|
|
buf[2] = 0x5;
|
|
buf[3] = (buf[3] & 0xf0) | 2;
|
|
ata_scsi_rbuf_put(cmd, buf);
|
|
}
|
|
cmd->result = SAM_STAT_GOOD;
|
|
}
|
|
|
|
qc->scsidone(cmd);
|
|
|
|
return 0;
|
|
}
|
|
/**
|
|
* atapi_xlat - Initialize PACKET taskfile
|
|
* @qc: command structure to be initialized
|
|
* @scsicmd: SCSI CDB associated with this PACKET command
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*
|
|
* RETURNS:
|
|
* Zero on success, non-zero on failure.
|
|
*/
|
|
|
|
static unsigned int atapi_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
|
|
{
|
|
struct scsi_cmnd *cmd = qc->scsicmd;
|
|
struct ata_device *dev = qc->dev;
|
|
int using_pio = (dev->flags & ATA_DFLAG_PIO);
|
|
int nodata = (cmd->sc_data_direction == DMA_NONE);
|
|
|
|
if (!using_pio)
|
|
/* Check whether ATAPI DMA is safe */
|
|
if (ata_check_atapi_dma(qc))
|
|
using_pio = 1;
|
|
|
|
memcpy(&qc->cdb, scsicmd, qc->ap->cdb_len);
|
|
|
|
qc->complete_fn = atapi_qc_complete;
|
|
|
|
qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
|
|
if (cmd->sc_data_direction == DMA_TO_DEVICE) {
|
|
qc->tf.flags |= ATA_TFLAG_WRITE;
|
|
DPRINTK("direction: write\n");
|
|
}
|
|
|
|
qc->tf.command = ATA_CMD_PACKET;
|
|
|
|
/* no data, or PIO data xfer */
|
|
if (using_pio || nodata) {
|
|
if (nodata)
|
|
qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
|
|
else
|
|
qc->tf.protocol = ATA_PROT_ATAPI;
|
|
qc->tf.lbam = (8 * 1024) & 0xff;
|
|
qc->tf.lbah = (8 * 1024) >> 8;
|
|
}
|
|
|
|
/* DMA data xfer */
|
|
else {
|
|
qc->tf.protocol = ATA_PROT_ATAPI_DMA;
|
|
qc->tf.feature |= ATAPI_PKT_DMA;
|
|
|
|
#ifdef ATAPI_ENABLE_DMADIR
|
|
/* some SATA bridges need us to indicate data xfer direction */
|
|
if (cmd->sc_data_direction != DMA_TO_DEVICE)
|
|
qc->tf.feature |= ATAPI_DMADIR;
|
|
#endif
|
|
}
|
|
|
|
qc->nbytes = cmd->bufflen;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* 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_set lock)
|
|
*
|
|
* RETURNS:
|
|
* Associated ATA device, or %NULL if not found.
|
|
*/
|
|
|
|
static struct ata_device *
|
|
ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev)
|
|
{
|
|
struct ata_device *dev;
|
|
|
|
/* skip commands not addressed to targets we simulate */
|
|
if (likely(scsidev->id < ATA_MAX_DEVICES))
|
|
dev = &ap->device[scsidev->id];
|
|
else
|
|
return NULL;
|
|
|
|
if (unlikely((scsidev->channel != 0) ||
|
|
(scsidev->lun != 0)))
|
|
return NULL;
|
|
|
|
if (unlikely(!ata_dev_present(dev)))
|
|
return NULL;
|
|
|
|
#ifndef ATA_ENABLE_ATAPI
|
|
if (unlikely(dev->class == ATA_DEV_ATAPI))
|
|
return NULL;
|
|
#endif
|
|
|
|
return dev;
|
|
}
|
|
|
|
/**
|
|
* ata_get_xlat_func - check if SCSI to ATA translation is possible
|
|
* @dev: ATA device
|
|
* @cmd: SCSI command opcode to consider
|
|
*
|
|
* Look up the SCSI command given, and determine whether the
|
|
* SCSI command is to be translated or simulated.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to translation function if possible, %NULL if not.
|
|
*/
|
|
|
|
static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
|
|
{
|
|
switch (cmd) {
|
|
case READ_6:
|
|
case READ_10:
|
|
case READ_16:
|
|
|
|
case WRITE_6:
|
|
case WRITE_10:
|
|
case WRITE_16:
|
|
return ata_scsi_rw_xlat;
|
|
|
|
case SYNCHRONIZE_CACHE:
|
|
if (ata_try_flush_cache(dev))
|
|
return ata_scsi_flush_xlat;
|
|
break;
|
|
|
|
case VERIFY:
|
|
case VERIFY_16:
|
|
return ata_scsi_verify_xlat;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_dump_cdb - dump SCSI command contents to dmesg
|
|
* @ap: ATA port to which the command was being sent
|
|
* @cmd: SCSI command to dump
|
|
*
|
|
* Prints the contents of a SCSI command via printk().
|
|
*/
|
|
|
|
static inline void ata_scsi_dump_cdb(struct ata_port *ap,
|
|
struct scsi_cmnd *cmd)
|
|
{
|
|
#ifdef ATA_DEBUG
|
|
struct scsi_device *scsidev = cmd->device;
|
|
u8 *scsicmd = cmd->cmnd;
|
|
|
|
DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
|
|
ap->id,
|
|
scsidev->channel, scsidev->id, scsidev->lun,
|
|
scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
|
|
scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
|
|
scsicmd[8]);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
|
|
* @cmd: SCSI command to be sent
|
|
* @done: Completion function, called when command is complete
|
|
*
|
|
* In some cases, this function translates SCSI commands into
|
|
* ATA taskfiles, and queues the taskfiles to be sent to
|
|
* hardware. In other cases, this function simulates a
|
|
* SCSI device by evaluating and responding to certain
|
|
* SCSI commands. This creates the overall effect of
|
|
* ATA and ATAPI devices appearing as SCSI devices.
|
|
*
|
|
* LOCKING:
|
|
* Releases scsi-layer-held lock, and obtains host_set lock.
|
|
*
|
|
* RETURNS:
|
|
* Zero.
|
|
*/
|
|
|
|
int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct ata_port *ap;
|
|
struct ata_device *dev;
|
|
struct scsi_device *scsidev = cmd->device;
|
|
|
|
ap = (struct ata_port *) &scsidev->host->hostdata[0];
|
|
|
|
ata_scsi_dump_cdb(ap, cmd);
|
|
|
|
dev = ata_scsi_find_dev(ap, scsidev);
|
|
if (unlikely(!dev)) {
|
|
cmd->result = (DID_BAD_TARGET << 16);
|
|
done(cmd);
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (dev->class == ATA_DEV_ATA) {
|
|
ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
|
|
cmd->cmnd[0]);
|
|
|
|
if (xlat_func)
|
|
ata_scsi_translate(ap, dev, cmd, done, xlat_func);
|
|
else
|
|
ata_scsi_simulate(dev->id, cmd, done);
|
|
} else
|
|
ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
|
|
|
|
out_unlock:
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ata_scsi_simulate - simulate SCSI command on ATA device
|
|
* @id: current IDENTIFY data for target device.
|
|
* @cmd: SCSI command being sent to device.
|
|
* @done: SCSI command completion function.
|
|
*
|
|
* Interprets and directly executes a select list of SCSI commands
|
|
* that can be handled internally.
|
|
*
|
|
* LOCKING:
|
|
* spin_lock_irqsave(host_set lock)
|
|
*/
|
|
|
|
void ata_scsi_simulate(u16 *id,
|
|
struct scsi_cmnd *cmd,
|
|
void (*done)(struct scsi_cmnd *))
|
|
{
|
|
struct ata_scsi_args args;
|
|
u8 *scsicmd = cmd->cmnd;
|
|
|
|
args.id = id;
|
|
args.cmd = cmd;
|
|
args.done = done;
|
|
|
|
switch(scsicmd[0]) {
|
|
/* no-op's, complete with success */
|
|
case SYNCHRONIZE_CACHE:
|
|
case REZERO_UNIT:
|
|
case SEEK_6:
|
|
case SEEK_10:
|
|
case TEST_UNIT_READY:
|
|
case FORMAT_UNIT: /* FIXME: correct? */
|
|
case SEND_DIAGNOSTIC: /* FIXME: correct? */
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
|
|
break;
|
|
|
|
case INQUIRY:
|
|
if (scsicmd[1] & 2) /* is CmdDt set? */
|
|
ata_bad_cdb(cmd, done);
|
|
else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
|
|
else if (scsicmd[2] == 0x00)
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
|
|
else if (scsicmd[2] == 0x80)
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
|
|
else if (scsicmd[2] == 0x83)
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
|
|
else
|
|
ata_bad_cdb(cmd, done);
|
|
break;
|
|
|
|
case MODE_SENSE:
|
|
case MODE_SENSE_10:
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
|
|
break;
|
|
|
|
case MODE_SELECT: /* unconditionally return */
|
|
case MODE_SELECT_10: /* bad-field-in-cdb */
|
|
ata_bad_cdb(cmd, done);
|
|
break;
|
|
|
|
case READ_CAPACITY:
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
|
|
break;
|
|
|
|
case SERVICE_ACTION_IN:
|
|
if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
|
|
else
|
|
ata_bad_cdb(cmd, done);
|
|
break;
|
|
|
|
case REPORT_LUNS:
|
|
ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
|
|
break;
|
|
|
|
/* mandantory commands we haven't implemented yet */
|
|
case REQUEST_SENSE:
|
|
|
|
/* all other commands */
|
|
default:
|
|
ata_bad_scsiop(cmd, done);
|
|
break;
|
|
}
|
|
}
|
|
|