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libata: improve ata_down_xfermask_limit()

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Make ata_down_xfermask_limit() accept @sel instead of @force_pio0.
@sel selects how the xfermask limit will be adjusted.  The following
selectors are defined.

* ATA_DNXFER_PIO	: only speed down PIO
* ATA_DNXFER_DMA	: only speed down DMA, don't cause transfer mode change
* ATA_DNXFER_40C	: apply 40c cable limit
* ATA_DNXFER_FORCE_PIO	: force PIO
* ATA_DNXFER_FORCE_PIO0	: force PIO0 (same as original with @force_pio0 == 1)
* ATA_DNXFER_ANY	: same as original with @force_pio0 == 0

Currently, only ANY and FORCE_PIO0 are used to maintain the original
behavior.  Other selectors will be used later to improve EH speed down
sequence.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-02-02 16:22:30 +09:00
committed by Jeff Garzik
parent a619f981b4
commit 458337dbb1
3 changed files with 96 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

105
drivers/ata/libata-core.c
View File

@ -1780,6 +1780,7 @@ int ata_bus_probe(struct ata_port *ap)
int tries[ATA_MAX_DEVICES];
int i, rc, down_xfermask;
struct ata_device *dev;
int dnxfer_sel;
ata_port_probe(ap);
@ -1861,13 +1862,15 @@ int ata_bus_probe(struct ata_port *ap)
/* fall through */
default:
tries[dev->devno]--;
if (down_xfermask &&
ata_down_xfermask_limit(dev, tries[dev->devno] == 1))
dnxfer_sel = ATA_DNXFER_ANY;
if (tries[dev->devno] == 1)
dnxfer_sel = ATA_DNXFER_FORCE_PIO0;
if (down_xfermask && ata_down_xfermask_limit(dev, dnxfer_sel))
tries[dev->devno] = 0;
}
if (!tries[dev->devno]) {
ata_down_xfermask_limit(dev, 1);
ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0);
ata_dev_disable(dev);
}
@ -2300,7 +2303,7 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
/**
* ata_down_xfermask_limit - adjust dev xfer masks downward
* @dev: Device to adjust xfer masks
* @force_pio0: Force PIO0
* @sel: ATA_DNXFER_* selector
*
* Adjust xfer masks of @dev downward. Note that this function
* does not apply the change. Invoking ata_set_mode() afterwards
@ -2312,37 +2315,87 @@ int ata_timing_compute(struct ata_device *adev, unsigned short speed,
* RETURNS:
* 0 on success, negative errno on failure
*/
int ata_down_xfermask_limit(struct ata_device *dev, int force_pio0)
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
{
unsigned long xfer_mask;
int highbit;
char buf[32];
unsigned int orig_mask, xfer_mask;
unsigned int pio_mask, mwdma_mask, udma_mask;
int quiet, highbit;
xfer_mask = ata_pack_xfermask(dev->pio_mask, dev->mwdma_mask,
dev->udma_mask);
quiet = !!(sel & ATA_DNXFER_QUIET);
sel &= ~ATA_DNXFER_QUIET;
if (!xfer_mask)
goto fail;
/* don't gear down to MWDMA from UDMA, go directly to PIO */
if (xfer_mask & ATA_MASK_UDMA)
xfer_mask &= ~ATA_MASK_MWDMA;
xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
dev->mwdma_mask,
dev->udma_mask);
ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
highbit = fls(xfer_mask) - 1;
xfer_mask &= ~(1 << highbit);
if (force_pio0)
xfer_mask &= 1 << ATA_SHIFT_PIO;
if (!xfer_mask)
goto fail;
switch (sel) {
case ATA_DNXFER_PIO:
highbit = fls(pio_mask) - 1;
pio_mask &= ~(1 << highbit);
break;
case ATA_DNXFER_DMA:
if (udma_mask) {
highbit = fls(udma_mask) - 1;
udma_mask &= ~(1 << highbit);
if (!udma_mask)
return -ENOENT;
} else if (mwdma_mask) {
highbit = fls(mwdma_mask) - 1;
mwdma_mask &= ~(1 << highbit);
if (!mwdma_mask)
return -ENOENT;
}
break;
case ATA_DNXFER_40C:
udma_mask &= ATA_UDMA_MASK_40C;
break;
case ATA_DNXFER_FORCE_PIO0:
pio_mask &= 1;
case ATA_DNXFER_FORCE_PIO:
mwdma_mask = 0;
udma_mask = 0;
break;
case ATA_DNXFER_ANY:
/* don't gear down to MWDMA from UDMA, go directly to PIO */
if (xfer_mask & ATA_MASK_UDMA)
xfer_mask &= ~ATA_MASK_MWDMA;
highbit = fls(xfer_mask) - 1;
xfer_mask &= ~(1 << highbit);
break;
default:
BUG();
}
xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
return -ENOENT;
if (!quiet) {
if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
snprintf(buf, sizeof(buf), "%s:%s",
ata_mode_string(xfer_mask),
ata_mode_string(xfer_mask & ATA_MASK_PIO));
else
snprintf(buf, sizeof(buf), "%s",
ata_mode_string(xfer_mask));
ata_dev_printk(dev, KERN_WARNING,
"limiting speed to %s\n", buf);
}
ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
&dev->udma_mask);
ata_dev_printk(dev, KERN_WARNING, "limiting speed to %s\n",
ata_mode_string(xfer_mask));
return 0;
fail:
return -EINVAL;
}
static int ata_dev_set_mode(struct ata_device *dev)