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authorMark Lord <liml@rtr.ca>2007-08-08 01:08:45 +0900
committerJeff Garzik <jeff@garzik.org>2007-10-12 14:55:32 -0400
commitbaf4fdfaaf5cb9f4fb1c341c8cef60a64e580582 (patch)
treef26293a36958a6813bf1353cb07afd3d6be6aa0d /drivers
parent4cc980b34b2a25f600576dcd11de388bc44e1ebd (diff)
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/libata-core.c4
-rw-r--r--drivers/ata/libata-scsi.c52
-rw-r--r--drivers/ata/libata.h1
3 files changed, 41 insertions, 16 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index fc067937063..75ccf46972d 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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)");
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 58051ee40f1..7d66c986a54 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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) {
- ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
- scmd->cmnd[0]);
+ if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
+ goto bad_cdb_len;
- 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);
+ 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 (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;
}
/**
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 6d85edefa7c..11f64a43b38 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -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);