1. Patchew
  2. linux
  3. [PATCH v2 0/6] ATA PASS-THROUGH sense data fixes
  4. View patch

[PATCH v2 2/6] ata: libata-scsi: Fix offsets for the fixed format sense data

Igor Pylypiv posted 6 patches 1 year, 5 months ago
There is a newer version of this series
[PATCH v2 2/6] ata: libata-scsi: Fix offsets for the fixed format sense data
Posted by Igor Pylypiv 1 year, 5 months ago 
Correct the ATA PASS-THROUGH fixed format sense data offsets to conform
to SPC-6 and SAT-5 specifications. Additionally, set the VALID bit to
indicate that the INFORMATION field contains valid information.

INFORMATION
===========

SAT-5 Table 212 — "Fixed format sense data INFORMATION field for the ATA
PASS-THROUGH commands" defines the following format:

+------+------------+
| Byte |   Field    |
+------+------------+
|    0 | ERROR      |
|    1 | STATUS     |
|    2 | DEVICE     |
|    3 | COUNT(7:0) |
+------+------------+

SPC-6 Table 48 - "Fixed format sense data" specifies that the INFORMATION
field starts at byte 3 in sense buffer resulting in the following offsets
for the ATA PASS-THROUGH commands:

+------------+-------------------------+
|   Field    |  Offset in sense buffer |
+------------+-------------------------+
| ERROR      |  3                      |
| STATUS     |  4                      |
| DEVICE     |  5                      |
| COUNT(7:0) |  6                      |
+------------+-------------------------+

COMMAND-SPECIFIC INFORMATION
============================

SAT-5 Table 213 - "Fixed format sense data COMMAND-SPECIFIC INFORMATION
field for ATA PASS-THROUGH" defines the following format:

+------+-------------------+
| Byte |        Field      |
+------+-------------------+
|    0 | FLAGS | LOG INDEX |
|    1 | LBA (7:0)         |
|    2 | LBA (15:8)        |
|    3 | LBA (23:16)       |
+------+-------------------+

SPC-6 Table 48 - "Fixed format sense data" specifies that
the COMMAND-SPECIFIC-INFORMATION field starts at byte 8
in sense buffer resulting in the following offsets for
the ATA PASS-THROUGH commands:

Offsets of these fields in the fixed sense format are as follows:

+-------------------+-------------------------+
|       Field       |  Offset in sense buffer |
+-------------------+-------------------------+
| FLAGS | LOG INDEX |  8                      |
| LBA (7:0)         |  9                      |
| LBA (15:8)        |  10                     |
| LBA (23:16)       |  11                     |
+-------------------+-------------------------+

Reported-by: Akshat Jain <akshatzen@google.com>
Fixes: 11093cb1ef56 ("libata-scsi: generate correct ATA pass-through sense")
Cc: stable@vger.kernel.org
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
---
 drivers/ata/libata-scsi.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 54fed6a427b1..26b1263f5c7c 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -245,9 +245,9 @@ static void ata_scsi_set_passthru_sense_fields(struct ata_queued_cmd *qc)
 	struct scsi_cmnd *cmd = qc->scsicmd;
 	struct ata_taskfile *tf = &qc->result_tf;
 	unsigned char *sb = cmd->sense_buffer;
-	unsigned char *desc = sb + 8;
 
-	if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) {
+	if ((sb[0] & 0x7f) >= 0x72) {
+		unsigned char *desc;
 		u8 len;
 
 		/* descriptor format */
@@ -286,21 +286,21 @@ static void ata_scsi_set_passthru_sense_fields(struct ata_queued_cmd *qc)
 		}
 	} else {
 		/* Fixed sense format */
-		desc[0] = tf->error;
-		desc[1] = tf->status;
-		desc[2] = tf->device;
-		desc[3] = tf->nsect;
-		desc[7] = 0;
+		sb[0] |= 0x80;
+		sb[3] = tf->error;
+		sb[4] = tf->status;
+		sb[5] = tf->device;
+		sb[6] = tf->nsect;
 		if (tf->flags & ATA_TFLAG_LBA48)  {
-			desc[8] |= 0x80;
+			sb[8] |= 0x80;
 			if (tf->hob_nsect)
-				desc[8] |= 0x40;
+				sb[8] |= 0x40;
 			if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah)
-				desc[8] |= 0x20;
+				sb[8] |= 0x20;
 		}
-		desc[9] = tf->lbal;
-		desc[10] = tf->lbam;
-		desc[11] = tf->lbah;
+		sb[9] = tf->lbal;
+		sb[10] = tf->lbam;
+		sb[11] = tf->lbah;
 	}
 }
 
-- 
2.45.2.741.gdbec12cfda-goog
Re: [PATCH v2 2/6] ata: libata-scsi: Fix offsets for the fixed format sense data
Posted by Damien Le Moal 1 year, 5 months ago 
On 6/25/24 07:12, Igor Pylypiv wrote:
> Correct the ATA PASS-THROUGH fixed format sense data offsets to conform
> to SPC-6 and SAT-5 specifications. Additionally, set the VALID bit to
> indicate that the INFORMATION field contains valid information.

This needs to go before patch 1. Then patch 1 modification introducing the new
function ata_scsi_set_passthru_sense_fields() will be doing so using the
corrected code.

-- 
Damien Le Moal
Western Digital Research
Re: [PATCH v2 2/6] ata: libata-scsi: Fix offsets for the fixed format sense data
Posted by Hannes Reinecke 1 year, 5 months ago 
On 6/25/24 00:12, Igor Pylypiv wrote:
> Correct the ATA PASS-THROUGH fixed format sense data offsets to conform
> to SPC-6 and SAT-5 specifications. Additionally, set the VALID bit to
> indicate that the INFORMATION field contains valid information.
> 
> INFORMATION
> ===========
> 
> SAT-5 Table 212 — "Fixed format sense data INFORMATION field for the ATA
> PASS-THROUGH commands" defines the following format:
> 
> +------+------------+
> | Byte |   Field    |
> +------+------------+
> |    0 | ERROR      |
> |    1 | STATUS     |
> |    2 | DEVICE     |
> |    3 | COUNT(7:0) |
> +------+------------+
> 
> SPC-6 Table 48 - "Fixed format sense data" specifies that the INFORMATION
> field starts at byte 3 in sense buffer resulting in the following offsets
> for the ATA PASS-THROUGH commands:
> 
> +------------+-------------------------+
> |   Field    |  Offset in sense buffer |
> +------------+-------------------------+
> | ERROR      |  3                      |
> | STATUS     |  4                      |
> | DEVICE     |  5                      |
> | COUNT(7:0) |  6                      |
> +------------+-------------------------+
> 
> COMMAND-SPECIFIC INFORMATION
> ============================
> 
> SAT-5 Table 213 - "Fixed format sense data COMMAND-SPECIFIC INFORMATION
> field for ATA PASS-THROUGH" defines the following format:
> 
> +------+-------------------+
> | Byte |        Field      |
> +------+-------------------+
> |    0 | FLAGS | LOG INDEX |
> |    1 | LBA (7:0)         |
> |    2 | LBA (15:8)        |
> |    3 | LBA (23:16)       |
> +------+-------------------+
> 
> SPC-6 Table 48 - "Fixed format sense data" specifies that
> the COMMAND-SPECIFIC-INFORMATION field starts at byte 8
> in sense buffer resulting in the following offsets for
> the ATA PASS-THROUGH commands:
> 
> Offsets of these fields in the fixed sense format are as follows:
> 
> +-------------------+-------------------------+
> |       Field       |  Offset in sense buffer |
> +-------------------+-------------------------+
> | FLAGS | LOG INDEX |  8                      |
> | LBA (7:0)         |  9                      |
> | LBA (15:8)        |  10                     |
> | LBA (23:16)       |  11                     |
> +-------------------+-------------------------+
> 
> Reported-by: Akshat Jain <akshatzen@google.com>
> Fixes: 11093cb1ef56 ("libata-scsi: generate correct ATA pass-through sense")
> Cc: stable@vger.kernel.org
> Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
> ---
>   drivers/ata/libata-scsi.c | 26 +++++++++++++-------------
>   1 file changed, 13 insertions(+), 13 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@suse.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich

Patchew 2.1-devel-b67e4c2

© 2016 - 2025 Red Hat, Inc.