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libata: add support for ATA_16 on ATAPI 

Add support for issuing ATA_16 passthru commands to ATAPI devices
managed by libata.  It requires the previous CDB length fix patch.

A boot/module parameter, "atapi_passthru16=0" can be used to globally
disable this feature, if ever desired.

tj: restructured __ata_scsi_queuecmd() according to Jeff's suggestion.

Signed-off-by: Mark Lord <liml@rtr.ca>
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mark Lord 2007-08-08 01:08:45 +09:00 committed by Jeff Garzik
parent 4cc980b34b
commit baf4fdfaaf
3 changed files with 41 additions and 16 deletions
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4
drivers/ata/libata-core.c
View File

@ -86,6 +86,10 @@ int atapi_dmadir = 0;
module_param(atapi_dmadir, int, 0444);
MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off, 1=on)");
int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices; on by default (0=off, 1=on)");
int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");

52
drivers/ata/libata-scsi.c
View File

@ -2761,28 +2761,48 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
void (*done)(struct scsi_cmnd *),
struct ata_device *dev)
{
u8 scsi_op = scmd->cmnd[0];
ata_xlat_func_t xlat_func;
int rc = 0;
if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len)) {
DPRINTK("bad CDB len=%u, max=%u\n",
scmd->cmd_len, dev->cdb_len);
scmd->result = DID_ERROR << 16;
done(scmd);
return 0;
if (dev->class == ATA_DEV_ATA) {
if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
goto bad_cdb_len;
xlat_func = ata_get_xlat_func(dev, scsi_op);
} else {
if (unlikely(!scmd->cmd_len))
goto bad_cdb_len;
xlat_func = NULL;
if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
/* relay SCSI command to ATAPI device */
if (unlikely(scmd->cmd_len > dev->cdb_len))
goto bad_cdb_len;
xlat_func = atapi_xlat;
} else {
/* ATA_16 passthru, treat as an ATA command */
if (unlikely(scmd->cmd_len > 16))
goto bad_cdb_len;
xlat_func = ata_get_xlat_func(dev, scsi_op);
}
}
if (dev->class == ATA_DEV_ATA) {
ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
scmd->cmnd[0]);
if (xlat_func)
rc = ata_scsi_translate(dev, scmd, done, xlat_func);
else
ata_scsi_simulate(dev, scmd, done);
} else
rc = ata_scsi_translate(dev, scmd, done, atapi_xlat);
if (xlat_func)
rc = ata_scsi_translate(dev, scmd, done, xlat_func);
else
ata_scsi_simulate(dev, scmd, done);
return rc;
bad_cdb_len:
DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
scmd->cmd_len, scsi_op, dev->cdb_len);
scmd->result = DID_ERROR << 16;
done(scmd);
return 0;
}
/**

1
drivers/ata/libata.h
View File

@ -56,6 +56,7 @@ extern unsigned int ata_print_id;
extern struct workqueue_struct *ata_aux_wq;
extern int atapi_enabled;
extern int atapi_dmadir;
extern int atapi_passthru16;
extern int libata_fua;
extern int libata_noacpi;
extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);