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libata: Fix a large collection of DMA mode mismatches

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Dave Müller sent a diff for the pata_oldpiix that highlighted a problem
where a lot of the ATA drivers assume dma_mode == 0 means "no DMA" while
the core code uses 0xFF.

This turns out to have other consequences such as code doing >= XFER_UDMA_0
also catching 0xFF as UDMAlots. Fortunately it doesn't generally affect
set_dma_mode, although some drivers call back into their own set mode code
from other points.

Having been through the drivers I've added helpers for using_udma/using_mwdma
dma_enabled so that people don't open code ranges that may change (eg if UDMA8
appears somewhere)

Thanks to David for the initial bits
[and added fix for pata_oldpiix from and signed-off-by Dave Mueller
 <dave.mueller@gmx.ch>  -jg]

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alan Cox 2008-08-01 09:18:34 +01:00 committed by Jeff Garzik
parent 20e2de4a50
commit b15b3ebae1
7 changed files with 33 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/ata/libata-core.c
View File

@ -3288,7 +3288,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
dev->dma_mode = ata_xfer_mask2mode(dma_mask);
found = 1;
if (dev->dma_mode != 0xff)
if (ata_dma_enabled(dev))
used_dma = 1;
}
if (!found)
@ -3313,7 +3313,7 @@ int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
/* step 3: set host DMA timings */
ata_link_for_each_dev(dev, link) {
if (!ata_dev_enabled(dev) || dev->dma_mode == 0xff)
if (!ata_dev_enabled(dev) || !ata_dma_enabled(dev))
continue;
dev->xfer_mode = dev->dma_mode;

2
drivers/ata/pata_acpi.c
View File

@ -181,7 +181,7 @@ static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
if (adev != acpi->last) {
pacpi_set_piomode(ap, adev);
if (adev->dma_mode)
if (ata_dma_enabled(adev))
pacpi_set_dmamode(ap, adev);
acpi->last = adev;
}

2
drivers/ata/pata_atiixp.c
View File

@ -183,7 +183,7 @@ static void atiixp_bmdma_start(struct ata_queued_cmd *qc)
u16 tmp16;
pci_read_config_word(pdev, ATIIXP_IDE_UDMA_CONTROL, &tmp16);
if (adev->dma_mode >= XFER_UDMA_0)
if (ata_using_udma(adev))
tmp16 |= (1 << dn);
else
tmp16 &= ~(1 << dn);

6
drivers/ata/pata_cs5530.c
View File

@ -149,10 +149,10 @@ static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)
struct ata_device *prev = ap->private_data;
/* See if the DMA settings could be wrong */
if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
/* Maybe, but do the channels match MWDMA/UDMA ? */
if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||
(adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
(ata_using_udma(prev) && !ata_using_udma(adev)))
/* Switch the mode bits */
cs5530_set_dmamode(ap, adev);
}

2
drivers/ata/pata_oldpiix.c
View File

@ -198,7 +198,7 @@ static unsigned int oldpiix_qc_issue(struct ata_queued_cmd *qc)
if (adev != ap->private_data) {
oldpiix_set_piomode(ap, adev);
if (adev->dma_mode)
if (ata_dma_enabled(adev))
oldpiix_set_dmamode(ap, adev);
}
return ata_sff_qc_issue(qc);

6
drivers/ata/pata_sc1200.c
View File

@ -167,10 +167,10 @@ static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
struct ata_device *prev = ap->private_data;
/* See if the DMA settings could be wrong */
if (adev->dma_mode != 0 && adev != prev && prev != NULL) {
if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
/* Maybe, but do the channels match MWDMA/UDMA ? */
if ((adev->dma_mode >= XFER_UDMA_0 && prev->dma_mode < XFER_UDMA_0) ||
(adev->dma_mode < XFER_UDMA_0 && prev->dma_mode >= XFER_UDMA_0))
if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
(ata_using_udma(prev) && !ata_using_udma(adev)))
/* Switch the mode bits */
sc1200_set_dmamode(ap, adev);
}

22
include/linux/libata.h
View File

@ -1429,6 +1429,28 @@ static inline unsigned long ata_deadline(unsigned long from_jiffies,
return from_jiffies + msecs_to_jiffies(timeout_msecs);
}
/* Don't open code these in drivers as there are traps. Firstly the range may
change in future hardware and specs, secondly 0xFF means 'no DMA' but is
> UDMA_0. Dyma ddreigiau */
static inline int ata_using_mwdma(struct ata_device *adev)
{
if (adev->dma_mode >= XFER_MW_DMA_0 && adev->dma_mode <= XFER_MW_DMA_4)
return 1;
return 0;
}
static inline int ata_using_udma(struct ata_device *adev)
{
if (adev->dma_mode >= XFER_UDMA_0 && adev->dma_mode <= XFER_UDMA_7)
return 1;
return 0;
}
static inline int ata_dma_enabled(struct ata_device *adev)
{
return (adev->dma_mode == 0xFF ? 0 : 1);
}
/**************************************************************************
* PMP - drivers/ata/libata-pmp.c