Bug fixed in libata-scsi.c from previous patch.
Bit shifting of service action value in ata_scsi_var_len_cdb_xlat() was reversed.
I have tested a ata pass-thru(32) command with sg_io and it worked well.
I'm sorry for making a confusion.
Signed-off-by: Minwoo Im <dn3108@xxxxxxxxx>
---
drivers/ata/libata-core.c | 2 +-
drivers/ata/libata-scsi.c | 95 ++++++++++++++++++++++++++++++++++++++++++---
include/scsi/scsi_proto.h | 1 +
3 files changed, 91 insertions(+), 7 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index e157a0e..f1d3ba4 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2587,7 +2587,7 @@ int ata_dev_configure(struct ata_device *dev)
}
ata_dev_config_sense_reporting(dev);
ata_dev_config_zac(dev);
- dev->cdb_len = 16;
+ dev->cdb_len = 32;
}
/* ATAPI-specific feature tests */
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 49ba983..39f23e0 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3127,7 +3127,7 @@ static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
* ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
* @qc: command structure to be initialized
*
- * Handles either 12 or 16-byte versions of the CDB.
+ * Handles either 12, 16, or 32-byte versions of the CDB.
*
* RETURNS:
* Zero on success, non-zero on failure.
@@ -3140,13 +3140,36 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
const u8 *cdb = scmd->cmnd;
u16 fp;
- if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN) {
+ /*
+ * if SCSI operation code in cdb[0] is ATA_12 or ATA_16,
+ * then cdb[1] will contain protocol of ATA PASS-THROUGH.
+ * otherwise, Its operation code shall be ATA_32(7Fh).
+ * in this case, cdb[10] will contain protocol of it.
+ * we call this command as a variable-length cdb.
+ */
+ if (cdb[0] == ATA_12 || cdb[0] == ATA_16)
+ tf->protocol = ata_scsi_map_proto(cdb[1]);
+ else
+ tf->protocol = ata_scsi_map_proto(cdb[10]);
+
+ if (tf->protocol == ATA_PROT_UNKNOWN) {
fp = 1;
goto invalid_fld;
}
- if (ata_is_ncq(tf->protocol) && (cdb[2] & 0x3) == 0)
- tf->protocol = ATA_PROT_NCQ_NODATA;
+ /*
+ * if protocol has a NCQ property and transfer length is 0,
+ * then the protocol will be marked as a NCQ_NODATA.
+ * in case of ATA_12 and ATA_16, cdb[2] has a t_length field.
+ * otherwise, cdb[11] will have a t_length field.
+ */
+ if (cdb[0] == ATA_12 || cdb[0] == ATA_16) {
+ if (ata_is_ncq(tf->protocol) && (cdb[2] & 0x3) == 0)
+ tf->protocol = ATA_PROT_NCQ_NODATA;
+ } else {
+ if (ata_is_ncq(tf->protocol) && (cdb[11] & 0x3) == 0)
+ tf->protocol = ATA_PROT_NCQ_NODATA;
+ }
/* enable LBA */
tf->flags |= ATA_TFLAG_LBA;
@@ -3181,7 +3204,7 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
tf->lbah = cdb[12];
tf->device = cdb[13];
tf->command = cdb[14];
- } else {
+ } else if (cdb[0] == ATA_12) {
/*
* 12-byte CDB - incapable of extended commands.
*/
@@ -3194,6 +3217,31 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
tf->lbah = cdb[7];
tf->device = cdb[8];
tf->command = cdb[9];
+ } else {
+ /*
+ * 32-byte CDB - may contain extended command fields.
+ *
+ * If that is the case, copy the upper byte register values.
+ */
+ if (cdb[10] & 0x01) {
+ tf->hob_feature = cdb[20];
+ tf->hob_nsect = cdb[22];
+ tf->hob_lbal = cdb[16];
+ tf->hob_lbam = cdb[15];
+ tf->hob_lbah = cdb[14];
+ tf->flags |= ATA_TFLAG_LBA48;
+ } else
+ tf->flags &= ~ATA_TFLAG_LBA48;
+
+ tf->feature = cdb[21];
+ tf->nsect = cdb[23];
+ tf->lbal = cdb[19];
+ tf->lbam = cdb[18];
+ tf->lbah = cdb[17];
+ tf->device = cdb[24];
+ tf->command = cdb[25];
+ tf->auxiliary = (cdb[28] << 24) | (cdb[29] << 16)
+ | (cdb[30] << 8) | cdb[31];
}
/* For NCQ commands copy the tag value */
@@ -4068,6 +4116,33 @@ static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
}
/**
+ * ata_scsi_var_len_cdb_xlat - SATL Variable Length CDB to Handler
+ * @qc: Command to be translated
+ *
+ * Translate a SCSI variable length CDB to specified commands.
+ * It checks a service action value in CDB to call corresponding handler.
+ *
+ * RETURNS:
+ * Zero on success, non-zero on failure
+ */
+
+static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc)
+{
+ struct scsi_cmnd *scmd = qc->scsicmd;
+ const u8 *cdb = scmd->cmnd;
+ const u16 sa = (cdb[8] << 8) | cdb[9]; /* service action */
+
+ // if service action represents a ata pass-thru(32) command,
+ // then pass it to ata_scsi_pass_thru handler.
+ if (sa == ATA_32)
+ return ata_scsi_pass_thru(qc);
+
+unspprt_sa:
+ /* unsupported service action */
+ return 1;
+}
+
+/**
* ata_get_xlat_func - check if SCSI to ATA translation is possible
* @dev: ATA device
* @cmd: SCSI command opcode to consider
@@ -4107,6 +4182,9 @@ static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
case ATA_16:
return ata_scsi_pass_thru;
+ case VARIABLE_LENGTH_CMD:
+ return ata_scsi_var_len_cdb_xlat;
+
case MODE_SELECT:
case MODE_SELECT_10:
return ata_scsi_mode_select_xlat;
@@ -4385,7 +4463,12 @@ int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
shost->max_id = 16;
shost->max_lun = 1;
shost->max_channel = 1;
- shost->max_cmd_len = 16;
+ /*
+ * SPC-3, SPC-4: Definition of CDB
+ * A CDB may have a fixed length of up to 16 bytes or
+ * variable length of between 12 and 260 bytes.
+ */
+ shost->max_cmd_len = 260;
/* Schedule policy is determined by ->qc_defer()
* callback and it needs to see every deferred qc.
diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index ce78ec8..8545e34 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -164,6 +164,7 @@
#define WRITE_SAME_32 0x0d
/* Values for T10/04-262r7 */
+#define ATA_32 0x1ff0 /* 32-byte pass-thru, service action */
#define ATA_16 0x85 /* 16-byte pass-thru */
#define ATA_12 0xa1 /* 12-byte pass-thru */
--
1.7.9.5
--
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