This patch adds NCQ support to the sata_mv driver. Currently it does
not work: FPDMA commands time out, and eventually EH falls back to
non-NCQ, which works.
My attention has turned to other things for moment. Anybody interested
in sata_mv NCQ is encouraged to pick up where this left off, as this
patch, buggy or not, includes the changes that will be required to
enable command queueing in sata_mv.
commit 6bef64243c68bf637b5594a0a363d8105efedfa6
Author: Jeff Garzik <jeff@xxxxxxxxxx>
Date: Wed Jul 11 18:56:46 2007 -0400
[libata mv-ncq] sata_mv: Add NCQ support
Currently not working.
Signed-off-by: Jeff Garzik <jeff@xxxxxxxxxx>
drivers/ata/sata_mv.c | 70 +++++++++++++++++++++++++++++++++++---------------
1 file changed, 49 insertions(+), 21 deletions(-)
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 8ec5208..228f71a 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -29,8 +29,6 @@
I distinctly remember a couple workarounds (one related to PCI-X)
are still needed.
- 4) Add NCQ support (easy to intermediate, once new-EH support appears)
-
5) Investigate problems with PCI Message Signalled Interrupts (MSI).
6) Add port multiplier support (intermediate)
@@ -417,6 +415,7 @@ static void mv_error_handler(struct ata_port *ap);
static void mv_post_int_cmd(struct ata_queued_cmd *qc);
static void mv_eh_freeze(struct ata_port *ap);
static void mv_eh_thaw(struct ata_port *ap);
+static void mv6_dev_config(struct ata_device *dev);
static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static void mv5_phy_errata(struct mv_host_priv *hpriv, void __iomem *mmio,
@@ -440,6 +439,8 @@ static void mv6_reset_flash(struct mv_host_priv *hpriv, void __iomem *mmio);
static void mv_reset_pci_bus(struct pci_dev *pdev, void __iomem *mmio);
static void mv_channel_reset(struct mv_host_priv *hpriv, void __iomem *mmio,
unsigned int port_no);
+static void mv_edma_cfg(struct ata_port *ap, struct mv_host_priv *hpriv,
+ void __iomem *port_mmio);
static struct scsi_host_template mv5_sht = {
.module = THIS_MODULE,
@@ -464,7 +465,8 @@ static struct scsi_host_template mv6_sht = {
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
- .can_queue = ATA_DEF_QUEUE,
+ .change_queue_depth = ata_scsi_change_queue_depth,
+ .can_queue = MV_MAX_Q_DEPTH - 1,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = MV_MAX_SG_CT,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
@@ -510,6 +512,7 @@ static const struct ata_port_operations mv5_ops = {
static const struct ata_port_operations mv6_ops = {
.port_disable = ata_port_disable,
+ .dev_config = mv6_dev_config,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
@@ -590,26 +593,29 @@ static const struct ata_port_info mv_port_info[] = {
.port_ops = &mv5_ops,
},
{ /* chip_604x */
- .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
+ .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+ ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv6_ops,
},
{ /* chip_608x */
.flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
- MV_FLAG_DUAL_HC,
+ MV_FLAG_DUAL_HC | ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv6_ops,
},
{ /* chip_6042 */
- .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
+ .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+ ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv_iie_ops,
},
{ /* chip_7042 */
- .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS,
+ .flags = MV_COMMON_FLAGS | MV_6XXX_FLAGS |
+ ATA_FLAG_NCQ,
.pio_mask = 0x1f, /* pio0-4 */
.udma_mask = ATA_UDMA6,
.port_ops = &mv_iie_ops,
@@ -808,18 +814,23 @@ static void mv_set_edma_ptrs(void __iomem *port_mmio,
* LOCKING:
* Inherited from caller.
*/
-static void mv_start_dma(void __iomem *base, struct mv_host_priv *hpriv,
+static void mv_start_dma(struct ata_port *ap, void __iomem *base,
struct mv_port_priv *pp)
{
if (!(pp->pp_flags & MV_PP_FLAG_EDMA_EN)) {
+ struct mv_host_priv *hpriv = ap->host->private_data;
+
/* clear EDMA event indicators, if any */
writelfl(0, base + EDMA_ERR_IRQ_CAUSE_OFS);
+ mv_edma_cfg(ap, hpriv, base);
+
mv_set_edma_ptrs(base, hpriv, pp);
writelfl(EDMA_EN, base + EDMA_CMD_OFS);
pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
}
+
WARN_ON(!(EDMA_EN & readl(base + EDMA_CMD_OFS)));
}
@@ -996,9 +1007,20 @@ static int mv_scr_write(struct ata_port *ap, unsigned int sc_reg_in, u32 val)
return -EINVAL;
}
+static void mv6_dev_config(struct ata_device *adev)
+{
+ /*
+ * We don't have hob_nsect when doing NCQ commands, on Gen-II.
+ * See mv_qc_prep() for more info.
+ */
+ if (adev->flags & ATA_DFLAG_NCQ)
+ adev->max_sectors = ATA_MAX_SECTORS;
+}
+
static void mv_edma_cfg(struct ata_port *ap, struct mv_host_priv *hpriv,
void __iomem *port_mmio)
{
+ struct ata_device *adev = &ap->device[0]; /* hardcode dev 0 */
u32 cfg = readl(port_mmio + EDMA_CFG_OFS);
/* set up non-NCQ EDMA configuration */
@@ -1013,6 +1035,14 @@ static void mv_edma_cfg(struct ata_port *ap, struct mv_host_priv *hpriv,
cfg &= ~0x1f; /* clear queue depth */
cfg |= EDMA_CFG_RD_BRST_EXT | EDMA_CFG_WR_BUFF_LEN;
cfg &= ~(EDMA_CFG_NCQ | EDMA_CFG_NCQ_GO_ON_ERR); /* clear NCQ */
+
+ if (adev->flags & ATA_DFLAG_NCQ) {
+ unsigned int dev_depth =
+ ata_id_queue_depth(adev->id) - 1;
+
+ cfg |= EDMA_CFG_NCQ;
+ cfg |= (dev_depth & 0x1f);
+ }
}
else if (IS_GEN_IIE(hpriv)) {
@@ -1023,6 +1053,9 @@ static void mv_edma_cfg(struct ata_port *ap, struct mv_host_priv *hpriv,
cfg |= (1 << 17); /* enab cut-through (dis stor&forwrd) */
cfg &= ~(1 << 16); /* dis FIS-based switching (for now) */
cfg &= ~(EDMA_CFG_NCQ); /* clear NCQ */
+
+ if (adev->flags & ATA_DFLAG_NCQ)
+ cfg |= EDMA_CFG_NCQ;
}
writelfl(cfg, port_mmio + EDMA_CFG_OFS);
@@ -1178,7 +1211,8 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
u16 flags = 0;
unsigned in_index;
- if (qc->tf.protocol != ATA_PROT_DMA)
+ if ((qc->tf.protocol != ATA_PROT_DMA) &&
+ (qc->tf.protocol != ATA_PROT_NCQ))
return;
/* Fill in command request block
@@ -1215,13 +1249,11 @@ static void mv_qc_prep(struct ata_queued_cmd *qc)
case ATA_CMD_WRITE_FUA_EXT:
mv_crqb_pack_cmd(cw++, tf->hob_nsect, ATA_REG_NSECT, 0);
break;
-#ifdef LIBATA_NCQ /* FIXME: remove this line when NCQ added */
case ATA_CMD_FPDMA_READ:
case ATA_CMD_FPDMA_WRITE:
mv_crqb_pack_cmd(cw++, tf->hob_feature, ATA_REG_FEATURE, 0);
mv_crqb_pack_cmd(cw++, tf->feature, ATA_REG_FEATURE, 0);
break;
-#endif /* FIXME: remove this line when NCQ added */
default:
/* The only other commands EDMA supports in non-queued and
* non-NCQ mode are: [RW] STREAM DMA and W DMA FUA EXT, none
@@ -1270,7 +1302,8 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
unsigned in_index;
u32 flags = 0;
- if (qc->tf.protocol != ATA_PROT_DMA)
+ if ((qc->tf.protocol != ATA_PROT_DMA) &&
+ (qc->tf.protocol != ATA_PROT_NCQ))
return;
/* Fill in Gen IIE command request block
@@ -1282,6 +1315,7 @@ static void mv_qc_prep_iie(struct ata_queued_cmd *qc)
flags |= qc->tag << CRQB_TAG_SHIFT;
flags |= qc->tag << CRQB_IOID_SHIFT; /* "I/O Id" is -really-
what we use as our tag */
+ flags |= qc->tag << CRQB_HOSTQ_SHIFT;
/* get current queue index from software */
in_index = pp->req_idx & MV_MAX_Q_DEPTH_MASK;
@@ -1335,10 +1369,10 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
struct ata_port *ap = qc->ap;
void __iomem *port_mmio = mv_ap_base(ap);
struct mv_port_priv *pp = ap->private_data;
- struct mv_host_priv *hpriv = ap->host->private_data;
u32 in_index;
- if (qc->tf.protocol != ATA_PROT_DMA) {
+ if ((qc->tf.protocol != ATA_PROT_DMA) &&
+ (qc->tf.protocol != ATA_PROT_NCQ)) {
/* We're about to send a non-EDMA capable command to the
* port. Turn off EDMA so there won't be problems accessing
* shadow block, etc registers.
@@ -1347,13 +1381,7 @@ static unsigned int mv_qc_issue(struct ata_queued_cmd *qc)
return ata_qc_issue_prot(qc);
}
- mv_start_dma(port_mmio, hpriv, pp);
-
- in_index = pp->req_idx & MV_MAX_Q_DEPTH_MASK;
-
- /* until we do queuing, the queue should be empty at this point */
- WARN_ON(in_index != ((readl(port_mmio + EDMA_REQ_Q_OUT_PTR_OFS)
- >> EDMA_REQ_Q_PTR_SHIFT) & MV_MAX_Q_DEPTH_MASK));
+ mv_start_dma(ap, port_mmio, pp);
pp->req_idx++;
-
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