From ee7fb331c3ac642b6bf8b9dc6f23a6a2e389d717 Mon Sep 17 00:00:00 2001 From: Vinayak Kale <vinayak.kale@seagate.com> Date: Tue, 27 Oct 2015 11:19:15 +0530 Subject: [PATCH] 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> --- 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 560cedea2b40c..8dffa99909850 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -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; -- GitLab