This patch implements NCQ command translation. Note that NCQ commands
don't use ata_rwcmd_protocol() to choose ATA command. This is
because, unlike non-NCQ RW commands, NCQ commands can only be used for
NCQ protocol and FUA handling is done with a flag rather than separate
command.
Original implementation is from Jens Axboe.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/scsi/libata-core.c | 1 +
drivers/scsi/libata-scsi.c | 31 ++++++++++++++++++++++++++++++-
2 files changed, 31 insertions(+), 1 deletions(-)
b3b26b1edc907b391ca73d68a0b5d03d409d6799
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index b4eeb4b..cc45cfc 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -4272,6 +4272,7 @@ static inline int ata_should_dma_map(str
struct ata_port *ap = qc->ap;
switch (qc->tf.protocol) {
+ case ATA_PROT_NCQ:
case ATA_PROT_DMA:
case ATA_PROT_ATAPI_DMA:
return 1;
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index f3a73c4..d5748b1 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -1098,7 +1098,36 @@ static unsigned int ata_scsi_rw_xlat(str
*/
goto nothing_to_do;
- if (dev->flags & ATA_DFLAG_LBA) {
+ if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
+ /* yay, NCQ */
+ if (!lba_48_ok(block, n_block))
+ goto out_of_range;
+
+ tf->protocol = ATA_PROT_NCQ;
+ tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
+
+ if (tf->flags & ATA_TFLAG_WRITE)
+ tf->command = ATA_CMD_FPDMA_WRITE;
+ else
+ tf->command = ATA_CMD_FPDMA_READ;
+
+ qc->nsect = n_block;
+
+ tf->nsect = qc->tag << 3;
+ tf->hob_feature = (n_block >> 8) & 0xff;
+ tf->feature = n_block & 0xff;
+
+ tf->hob_lbah = (block >> 40) & 0xff;
+ tf->hob_lbam = (block >> 32) & 0xff;
+ tf->hob_lbal = (block >> 24) & 0xff;
+ tf->lbah = (block >> 16) & 0xff;
+ tf->lbam = (block >> 8) & 0xff;
+ tf->lbal = block & 0xff;
+
+ tf->device = 1 << 6;
+ if (tf->flags & ATA_TFLAG_FUA)
+ tf->device |= 1 << 7;
+ } else if (dev->flags & ATA_DFLAG_LBA) {
tf->flags |= ATA_TFLAG_LBA;
if (lba_28_ok(block, n_block)) {
--
1.2.4
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