This is useful when debugging, handling problem systems, or for
distributions just to get the system installed so it can be sorted
out later.
This is a bit smarter than the old IDE one and lets you do
libata.pata_dma=0 Disable all PATA DMA like old IDE
libata.pata_dma=1 Disk DMA only
libata.pata_dma=2 ATAPI DMA only
libata.pata_dma=4 CF DMA only
(or combinations thereof - 0,1,3 being the useful ones I suspect)
(I've split CF as it seems to be a seperate case of pain and suffering
different to the others and caused by assorted PIO wired adapters etc)
SATA is not affected - for one its not clear it makes sense to disable
DMA for SATA if even always possible, for two we've seen no failure
evidence to justify needing to support this kind of hammer on SATA.
Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
diff -u --new-file --recursive --exclude-from /usr/src/exclude
linux.vanilla-2.6.23rc3-mm1/include/linux/libata.h
linux-2.6.23rc3-mm1/include/linux/libata.h
--- linux.vanilla-2.6.23rc3-mm1/include/linux/libata.h 2007-08-22
17:23:14.000000000 +0100
+++ linux-2.6.23rc3-mm1/include/linux/libata.h 2007-08-22 17:50:32.000000000
+0100
@@ -315,6 +315,12 @@
ATA_HORKAGE_NONCQ = (1 << 2), /* Don't use NCQ */
ATA_HORKAGE_MAX_SEC_128 = (1 << 3), /* Limit max sects to 128 */
ATA_HORKAGE_HPA_SIZE = (1 << 4), /* Reports native size off by
one */
+
+ /* DMA mask for user DMA control: User visible values do not
+ renumber */
+ ATA_DMA_MASK_ATA = (1 << 0), /* DMA on ATA Disk */
+ ATA_DMA_MASK_ATAPI = (1 << 1), /* DMA on ATAPI */
+ ATA_DMA_MASK_CFA = (1 << 2), /* DMA on CF Card */
};
enum hsm_task_states {
diff -u --new-file --recursive --exclude-from /usr/src/exclude
linux.vanilla-2.6.23rc3-mm1/drivers/ata/libata-core.c
linux-2.6.23rc3-mm1/drivers/ata/libata-core.c
--- linux.vanilla-2.6.23rc3-mm1/drivers/ata/libata-core.c 2007-08-22
17:23:00.000000000 +0100
+++ linux-2.6.23rc3-mm1/drivers/ata/libata-core.c 2007-08-22
18:17:31.321738376 +0100
@@ -99,6 +99,10 @@
module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore
limits, using full disk)");
+static int ata_pata_dma = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
+module_param_named(pata_dma, ata_pata_dma, int, 0644);
+MODULE_PARM_DESC(pata_dma, "Use DMA on PATA devices");
+
static int ata_probe_timeout = ATA_TMOUT_INTERNAL / HZ;
module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");
@@ -2839,14 +2854,27 @@
/* step 1: calculate xfer_mask */
ata_link_for_each_dev(dev, link) {
unsigned int pio_mask, dma_mask;
+ unsigned int mode_mask;
if (!ata_dev_enabled(dev))
continue;
+ mode_mask = ATA_DMA_MASK_ATA;
+ if (dev->class == ATA_DEV_ATAPI)
+ mode_mask = ATA_DMA_MASK_ATAPI;
+ else if (ata_id_is_cfa(dev->id))
+ mode_mask = ATA_DMA_MASK_CFA;
+
ata_dev_xfermask(dev);
pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
dev->udma_mask);
+
+ if ((ata_pata_dma & mode_mask) || ap->cbl == ATA_CBL_SATA)
+ dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
dev->udma_mask);
+ else
+ dma_mask = 0;
+
dev->pio_mode = ata_xfer_mask2mode(pio_mask);
dev->dma_mode = ata_xfer_mask2mode(dma_mask);
-
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