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libata: add support for NCQ commands for SG interface 

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@seagate.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Vinayak Kale 2015-10-27 11:19:15 +05:30 committed by Tejun Heo
parent eb351031a1
commit ee7fb331c3
1 changed files with 7 additions and 1 deletions
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8
drivers/ata/libata-scsi.c
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@ -2912,12 +2912,14 @@ 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;
@ -2990,6 +2992,10 @@ 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;