[PATCH] libata: interrupt driven pio for LLD

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>

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index cc2d130..f8a590e 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -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);
 

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index ea76fe4..b8f1f69 100644 (file)
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -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,
@@ -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,
@@ -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) */
@@ -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 */

diff --git a/drivers/scsi/sata_nv.c b/drivers/scsi/sata_nv.c
index c05653c..8b7e871 100644 (file)
--- a/drivers/scsi/sata_nv.c
+++ b/drivers/scsi/sata_nv.c
@@ -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);
                }
 

diff --git a/drivers/scsi/sata_promise.c b/drivers/scsi/sata_promise.c
index def7e0d..f67deb0 100644 (file)
--- a/drivers/scsi/sata_promise.c
+++ b/drivers/scsi/sata_promise.c
@@ -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 */
@@ -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 */
@@ -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 */
@@ -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);
                }
        }

diff --git a/drivers/scsi/sata_qstor.c b/drivers/scsi/sata_qstor.c
index ffcdeb6..a604afa 100644 (file)
--- a/drivers/scsi/sata_qstor.c
+++ b/drivers/scsi/sata_qstor.c
@@ -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,
@@ -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 */
@@ -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);

diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c
index 540a851..a9f9f76 100644 (file)
--- a/drivers/scsi/sata_sx4.c
+++ b/drivers/scsi/sata_sx4.c
@@ -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 */
@@ -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);
                }

diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index cf94e01..92378d7 100644 (file)
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -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);
                        }
                }

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 9ac2b69..ea8ab29 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -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? */