[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <1445924955-11124-1-git-send-email-vinayak.kale@seagate.com>
Date: Tue, 27 Oct 2015 11:19:15 +0530
From: vinayak.kale@...il.com
To: tj@...nel.org, linux-ide@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: sumit.g.gupta@...gate.com, Vinayak Kale <vinayak.kale@...gate.com>
Subject: [PATCH v2] libata: add support for NCQ commands for SG interface
From: Vinayak Kale <vinayak.kale@...gate.com>
This patch is needed to make NCQ commands with FPDMA protocol value
(eg READ/WRITE FPDMA) work over SCSI Generic (SG) interface.
Signed-off-by: Vinayak Kale <vinayak.kale@...gate.com>
---
Changes in v2:
- Decoupled tf->flags changes in ata_scsi_pass_thru() from this patch
as per Tejun's suggestion. A separate patch will be sent for that change.
drivers/ata/libata-scsi.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0d7f0da..c2af592 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2914,12 +2914,14 @@ ata_scsi_map_proto(u8 byte1)
case 5: /* PIO Data-out */
return ATA_PROT_PIO;
+ case 12: /* FPDMA */
+ return ATA_PROT_NCQ;
+
case 0: /* Hard Reset */
case 1: /* SRST */
case 8: /* Device Diagnostic */
case 9: /* Device Reset */
case 7: /* DMA Queued */
- case 12: /* FPDMA */
case 15: /* Return Response Info */
default: /* Reserved */
break;
@@ -2992,6 +2994,10 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
tf->command = cdb[9];
}
+ /* For NCQ commands with FPDMA protocol, copy the tag value */
+ if (tf->protocol == ATA_PROT_NCQ)
+ tf->nsect = qc->tag << 3;
+
/* enforce correct master/slave bit */
tf->device = dev->devno ?
tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists