Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
new file mode 100644
index 0000000..4e5e54a
--- /dev/null
+++ b/drivers/scsi/libata-scsi.c
@@ -0,0 +1,1593 @@
+/*
+ libata-scsi.c - helper library for ATA
+
+ Copyright 2003-2004 Red Hat, Inc. All rights reserved.
+ Copyright 2003-2004 Jeff Garzik
+
+ The contents of this file are subject to the Open
+ Software License version 1.1 that can be found at
+ http://www.opensource.org/licenses/osl-1.1.txt and is included herein
+ by reference.
+
+ Alternatively, the contents of this file may be used under the terms
+ of the GNU General Public License version 2 (the "GPL") as distributed
+ in the kernel source COPYING file, in which case the provisions of
+ the GPL are applicable instead of the above. If you wish to allow
+ the use of your version of this file only under the terms of the
+ GPL and not to allow others to use your version of this file under
+ the OSL, indicate your decision by deleting the provisions above and
+ replace them with the notice and other provisions required by the GPL.
+ If you do not delete the provisions above, a recipient may use your
+ version of this file under either the OSL or the GPL.
+
+ */
+
+#include <linux/kernel.h>
+#include <linux/blkdev.h>
+#include <linux/spinlock.h>
+#include <scsi/scsi.h>
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+#include <asm/uaccess.h>
+
+#include "libata.h"
+
+typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, u8 *scsicmd);
+static struct ata_device *
+ata_scsi_find_dev(struct ata_port *ap, struct scsi_device *scsidev);
+
+
+/**
+ * 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;
+}
+
+int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
+{
+ struct ata_port *ap;
+ struct ata_device *dev;
+ int val = -EINVAL, rc = -EINVAL;
+
+ ap = (struct ata_port *) &scsidev->host->hostdata[0];
+ if (!ap)
+ goto out;
+
+ dev = ata_scsi_find_dev(ap, scsidev);
+ if (!dev) {
+ rc = -ENODEV;
+ goto out;
+ }
+
+ 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;
+
+ default:
+ rc = -ENOTTY;
+ break;
+ }
+
+out:
+ return rc;
+}
+
+/**
+ * ata_scsi_qc_new - acquire new ata_queued_cmd reference
+ * @ap: ATA port to which the new command is attached
+ * @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_port *ap,
+ struct ata_device *dev,
+ struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *))
+{
+ struct ata_queued_cmd *qc;
+
+ qc = ata_qc_new_init(ap, 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_to_sense_error - convert ATA error to SCSI error
+ * @qc: Command that we are erroring out
+ * @drv_stat: value contained in ATA status register
+ *
+ * Converts an ATA error into a SCSI error. While we are at it
+ * we decode and dump the ATA error for the user so that they
+ * have some idea what really happened at the non make-believe
+ * layer.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ */
+
+void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat)
+{
+ struct scsi_cmnd *cmd = qc->scsicmd;
+ u8 err = 0;
+ unsigned char *sb = cmd->sense_buffer;
+ /* Based on the 3ware driver translation table */
+ static 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 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
+ };
+ int i = 0;
+
+ cmd->result = SAM_STAT_CHECK_CONDITION;
+
+ /*
+ * Is this an error we can process/parse
+ */
+
+ if(drv_stat & ATA_ERR)
+ /* Read the err bits */
+ err = ata_chk_err(qc->ap);
+
+ /* Display the ATA level error info */
+
+ printk(KERN_WARNING "ata%u: status=0x%02x { ", qc->ap->id, drv_stat);
+ if(drv_stat & 0x80)
+ {
+ printk("Busy ");
+ err = 0; /* Data is not valid in this case */
+ }
+ else {
+ if(drv_stat & 0x40) printk("DriveReady ");
+ if(drv_stat & 0x20) printk("DeviceFault ");
+ if(drv_stat & 0x10) printk("SeekComplete ");
+ if(drv_stat & 0x08) printk("DataRequest ");
+ if(drv_stat & 0x04) printk("CorrectedError ");
+ if(drv_stat & 0x02) printk("Index ");
+ if(drv_stat & 0x01) printk("Error ");
+ }
+ printk("}\n");
+
+ if(err)
+ {
+ printk(KERN_WARNING "ata%u: error=0x%02x { ", qc->ap->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");
+
+ /* Should we dump sector info here too ?? */
+ }
+
+
+ /* Look for err */
+ while(sense_table[i][0] != 0xFF)
+ {
+ /* Look for best matches first */
+ if((sense_table[i][0] & err) == sense_table[i][0])
+ {
+ sb[0] = 0x70;
+ sb[2] = sense_table[i][1];
+ sb[7] = 0x0a;
+ sb[12] = sense_table[i][2];
+ sb[13] = sense_table[i][3];
+ return;
+ }
+ i++;
+ }
+ /* No immediate match */
+ if(err)
+ printk(KERN_DEBUG "ata%u: no sense translation for 0x%02x\n", qc->ap->id, err);
+
+ i = 0;
+ /* Fall back to interpreting status bits */
+ while(stat_table[i][0] != 0xFF)
+ {
+ if(stat_table[i][0] & drv_stat)
+ {
+ sb[0] = 0x70;
+ sb[2] = stat_table[i][1];
+ sb[7] = 0x0a;
+ sb[12] = stat_table[i][2];
+ sb[13] = stat_table[i][3];
+ return;
+ }
+ i++;
+ }
+ /* No error ?? */
+ printk(KERN_ERR "ata%u: called with no error (%02X)!\n", qc->ap->id, drv_stat);
+ /* additional-sense-code[-qualifier] */
+
+ sb[0] = 0x70;
+ sb[2] = MEDIUM_ERROR;
+ sb[7] = 0x0A;
+ if (cmd->sc_data_direction == SCSI_DATA_READ) {
+ sb[12] = 0x11; /* "unrecovered read error" */
+ sb[13] = 0x04;
+ } else {
+ sb[12] = 0x0C; /* "write error - */
+ sb[13] = 0x02; /* auto-reallocation failed" */
+ }
+}
+
+/**
+ * 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)
+{
+ sdev->use_10_for_rw = 1;
+ sdev->use_10_for_ms = 1;
+
+ blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
+
+ if (sdev->id < ATA_MAX_DEVICES) {
+ struct ata_port *ap;
+ struct ata_device *dev;
+
+ ap = (struct ata_port *) &sdev->host->hostdata[0];
+ dev = &ap->device[sdev->id];
+
+ /* TODO: 1024 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.
+ */
+ if ((dev->flags & ATA_DFLAG_LBA48) &&
+ ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
+ sdev->host->max_sectors = 2048;
+ blk_queue_max_sectors(sdev->request_queue, 2048);
+ }
+ }
+
+ return 0; /* scsi layer doesn't check return value, sigh */
+}
+
+/**
+ * ata_scsi_error - SCSI layer error handler callback
+ * @host: SCSI host on which error occurred
+ *
+ * Handles SCSI-layer-thrown error events.
+ *
+ * LOCKING:
+ * Inherited from SCSI layer (none, can sleep)
+ *
+ * RETURNS:
+ * Zero.
+ */
+
+int ata_scsi_error(struct Scsi_Host *host)
+{
+ struct ata_port *ap;
+
+ DPRINTK("ENTER\n");
+
+ ap = (struct ata_port *) &host->hostdata[0];
+ ap->ops->eng_timeout(ap);
+
+ /* TODO: this is per-command; when queueing is supported
+ * this code will either change or move to a more
+ * appropriate place
+ */
+ host->host_failed--;
+
+ DPRINTK("EXIT\n");
+ return 0;
+}
+
+/**
+ * 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, u8 *scsicmd)
+{
+ struct ata_taskfile *tf = &qc->tf;
+
+ tf->flags |= ATA_TFLAG_DEVICE;
+ tf->protocol = ATA_PROT_NODATA;
+
+ if ((tf->flags & ATA_TFLAG_LBA48) &&
+ (ata_id_has_flush_ext(qc->dev->id)))
+ tf->command = ATA_CMD_FLUSH_EXT;
+ else
+ tf->command = ATA_CMD_FLUSH;
+
+ return 0;
+}
+
+/**
+ * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
+ * @qc: Storage for translated ATA taskfile
+ * @scsicmd: SCSI command to translate
+ *
+ * Converts SCSI VERIFY command to an ATA READ VERIFY command.
+ *
+ * LOCKING:
+ * spin_lock_irqsave(host_set lock)
+ *
+ * RETURNS:
+ * Zero on success, non-zero on error.
+ */
+
+static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, u8 *scsicmd)
+{
+ struct ata_taskfile *tf = &qc->tf;
+ unsigned int lba48 = tf->flags & ATA_TFLAG_LBA48;
+ u64 dev_sectors = qc->dev->n_sectors;
+ u64 sect = 0;
+ u32 n_sect = 0;
+
+ tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf->protocol = ATA_PROT_NODATA;
+ tf->device |= ATA_LBA;
+
+ if (scsicmd[0] == VERIFY) {
+ sect |= ((u64)scsicmd[2]) << 24;
+ sect |= ((u64)scsicmd[3]) << 16;
+ sect |= ((u64)scsicmd[4]) << 8;
+ sect |= ((u64)scsicmd[5]);
+
+ n_sect |= ((u32)scsicmd[7]) << 8;
+ n_sect |= ((u32)scsicmd[8]);
+ }
+
+ else if (scsicmd[0] == VERIFY_16) {
+ sect |= ((u64)scsicmd[2]) << 56;
+ sect |= ((u64)scsicmd[3]) << 48;
+ sect |= ((u64)scsicmd[4]) << 40;
+ sect |= ((u64)scsicmd[5]) << 32;
+ sect |= ((u64)scsicmd[6]) << 24;
+ sect |= ((u64)scsicmd[7]) << 16;
+ sect |= ((u64)scsicmd[8]) << 8;
+ sect |= ((u64)scsicmd[9]);
+
+ n_sect |= ((u32)scsicmd[10]) << 24;
+ n_sect |= ((u32)scsicmd[11]) << 16;
+ n_sect |= ((u32)scsicmd[12]) << 8;
+ n_sect |= ((u32)scsicmd[13]);
+ }
+
+ else
+ return 1;
+
+ if (!n_sect)
+ return 1;
+ if (sect >= dev_sectors)
+ return 1;
+ if ((sect + n_sect) > dev_sectors)
+ return 1;
+ if (lba48) {
+ if (n_sect > (64 * 1024))
+ 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 == SCSI_DATA_READ ||
+ cmd->sc_data_direction == SCSI_DATA_WRITE) {
+ 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 -
+ * @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 == SCSI_DATA_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 == SCSI_DATA_WRITE) {
+ 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 != SCSI_DATA_WRITE)
+ 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;
+ }
+}
+