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[PATCH] libata: interrupt driven pio for LLD
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libata.h:
libata-core:
  Add ATA_FLAG_PIO_POLLING flag for LLDs that expect interrupt for
command completion only.

sata_nv.c:
sata_vsc.c:
  irq handler is wrapper around ata_host_intr(), can handle PIO interrupts.

sata_promise.c:
sata_sx4.c:
sata_qstor.c:
sata_mv.c:
  Private irq handler.
  Polling mode ATA_FLAG_PIO_POLLING used for compatibility.

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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Albert Lee authored and Jeff Garzik committed Sep 28, 2005
1 parent 312f7da commit e50362e
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Showing 8 changed files with 48 additions and 21 deletions.
19 changes: 19 additions & 0 deletions drivers/scsi/libata-core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3356,6 +3356,25 @@ int ata_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;

/* Use polling pio if the LLD doesn't handle
* interrupt driven pio and atapi CDB interrupt.
*/
if (ap->flags & ATA_FLAG_PIO_POLLING) {
switch (qc->tf.protocol) {
case ATA_PROT_PIO:
case ATA_PROT_ATAPI:
case ATA_PROT_ATAPI_NODATA:
qc->tf.flags |= ATA_TFLAG_POLLING;
break;
case ATA_PROT_ATAPI_DMA:
if (qc->dev->flags & ATA_DFLAG_CDB_INTR)
BUG();
break;
default:
break;
}
}

/* select the device */
ata_dev_select(ap, qc->dev->devno, 1, 0);

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7 changes: 5 additions & 2 deletions drivers/scsi/sata_mv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -241,7 +241,8 @@ static struct ata_port_info mv_port_info[] = {
{ /* chip_504x */
.sht = &mv_sht,
.host_flags = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO),
ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING),
.pio_mask = 0x1f, /* pio4-0 */
.udma_mask = 0, /* 0x7f (udma6-0 disabled for now) */
.port_ops = &mv_ops,
Expand All @@ -250,7 +251,7 @@ static struct ata_port_info mv_port_info[] = {
.sht = &mv_sht,
.host_flags = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
MV_FLAG_DUAL_HC),
ATA_FLAG_PIO_POLLING | MV_FLAG_DUAL_HC),
.pio_mask = 0x1f, /* pio4-0 */
.udma_mask = 0, /* 0x7f (udma6-0 disabled for now) */
.port_ops = &mv_ops,
Expand All @@ -259,6 +260,7 @@ static struct ata_port_info mv_port_info[] = {
.sht = &mv_sht,
.host_flags = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING |
MV_FLAG_IRQ_COALESCE | MV_FLAG_BDMA),
.pio_mask = 0x1f, /* pio4-0 */
.udma_mask = 0, /* 0x7f (udma6-0 disabled for now) */
Expand All @@ -268,6 +270,7 @@ static struct ata_port_info mv_port_info[] = {
.sht = &mv_sht,
.host_flags = (ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SATA_RESET | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING |
MV_FLAG_IRQ_COALESCE | MV_FLAG_DUAL_HC |
MV_FLAG_BDMA),
.pio_mask = 0x1f, /* pio4-0 */
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4 changes: 2 additions & 2 deletions drivers/scsi/sata_nv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -304,11 +304,11 @@ static irqreturn_t nv_interrupt (int irq, void *dev_instance,

ap = host_set->ports[i];
if (ap &&
!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
!(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;

qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN)))
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
handled += ata_host_intr(ap, qc);
}

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13 changes: 8 additions & 5 deletions drivers/scsi/sata_promise.c
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Original file line number Diff line number Diff line change
Expand Up @@ -162,7 +162,8 @@ static struct ata_port_info pdc_port_info[] = {
{
.sht = &pdc_ata_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SRST | ATA_FLAG_MMIO,
ATA_FLAG_SRST | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
Expand All @@ -173,7 +174,8 @@ static struct ata_port_info pdc_port_info[] = {
{
.sht = &pdc_ata_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SRST | ATA_FLAG_MMIO,
ATA_FLAG_SRST | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
Expand All @@ -184,7 +186,8 @@ static struct ata_port_info pdc_port_info[] = {
{
.sht = &pdc_ata_sht,
.host_flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_SRST |
ATA_FLAG_MMIO | ATA_FLAG_SLAVE_POSS,
ATA_FLAG_MMIO | ATA_FLAG_SLAVE_POSS |
ATA_FLAG_PIO_POLLING,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
Expand Down Expand Up @@ -493,11 +496,11 @@ static irqreturn_t pdc_interrupt (int irq, void *dev_instance, struct pt_regs *r
ap = host_set->ports[i];
tmp = mask & (1 << (i + 1));
if (tmp && ap &&
!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
!(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;

qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN)))
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
handled += pdc_host_intr(ap, qc);
}
}
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11 changes: 5 additions & 6 deletions drivers/scsi/sata_qstor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -175,7 +175,7 @@ static struct ata_port_info qs_port_info[] = {
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SATA_RESET |
//FIXME ATA_FLAG_SRST |
ATA_FLAG_MMIO,
ATA_FLAG_MMIO | ATA_FLAG_PIO_POLLING,
.pio_mask = 0x10, /* pio4 */
.udma_mask = 0x7f, /* udma0-6 */
.port_ops = &qs_ata_ops,
Expand Down Expand Up @@ -389,14 +389,13 @@ static inline unsigned int qs_intr_pkt(struct ata_host_set *host_set)
DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x\n",
sff1, sff0, port_no, sHST, sDST);
handled = 1;
if (ap && !(ap->flags &
(ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
if (ap && !(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;
struct qs_port_priv *pp = ap->private_data;
if (!pp || pp->state != qs_state_pkt)
continue;
qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
switch (sHST) {
case 0: /* sucessful CPB */
case 3: /* device error */
Expand All @@ -422,13 +421,13 @@ static inline unsigned int qs_intr_mmio(struct ata_host_set *host_set)
struct ata_port *ap;
ap = host_set->ports[port_no];
if (ap &&
!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
!(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;
struct qs_port_priv *pp = ap->private_data;
if (!pp || pp->state != qs_state_mmio)
continue;
qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {

/* check main status, clearing INTRQ */
u8 status = ata_chk_status(ap);
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7 changes: 4 additions & 3 deletions drivers/scsi/sata_sx4.c
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Original file line number Diff line number Diff line change
Expand Up @@ -219,7 +219,8 @@ static struct ata_port_info pdc_port_info[] = {
{
.sht = &pdc_sata_sht,
.host_flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_SRST | ATA_FLAG_MMIO,
ATA_FLAG_SRST | ATA_FLAG_MMIO |
ATA_FLAG_PIO_POLLING,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x7f, /* udma0-6 ; FIXME */
Expand Down Expand Up @@ -832,11 +833,11 @@ static irqreturn_t pdc20621_interrupt (int irq, void *dev_instance, struct pt_re
tmp = mask & (1 << i);
VPRINTK("seq %u, port_no %u, ap %p, tmp %x\n", i, port_no, ap, tmp);
if (tmp && ap &&
!(ap->flags & (ATA_FLAG_PORT_DISABLED | ATA_FLAG_NOINTR))) {
!(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;

qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN)))
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
handled += pdc20621_host_intr(ap, qc, (i > 4),
mmio_base);
}
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6 changes: 3 additions & 3 deletions drivers/scsi/sata_vsc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -193,12 +193,12 @@ static irqreturn_t vsc_sata_interrupt (int irq, void *dev_instance,
struct ata_port *ap;

ap = host_set->ports[i];
if (ap && !(ap->flags &
(ATA_FLAG_PORT_DISABLED|ATA_FLAG_NOINTR))) {
if (ap &&
!(ap->flags & ATA_FLAG_PORT_DISABLED)) {
struct ata_queued_cmd *qc;

qc = ata_qc_from_tag(ap, ap->active_tag);
if (qc && (!(qc->tf.ctl & ATA_NIEN)))
if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)))
handled += ata_host_intr(ap, qc);
}
}
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2 changes: 2 additions & 0 deletions include/linux/libata.h
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,8 @@ enum {
ATA_FLAG_MMIO = (1 << 6), /* use MMIO, not PIO */
ATA_FLAG_SATA_RESET = (1 << 7), /* use COMRESET */
ATA_FLAG_PIO_DMA = (1 << 8), /* PIO cmds via DMA */
ATA_FLAG_PIO_POLLING = (1 << 9), /* use polling PIO if LLD
* doesn't handle PIO interrupts */

ATA_QCFLAG_ACTIVE = (1 << 1), /* cmd not yet ack'd to scsi lyer */
ATA_QCFLAG_SG = (1 << 3), /* have s/g table? */
Expand Down

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