Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b3a706014e56b1356e7b275fd25b833c63175bf0
Commit: b3a706014e56b1356e7b275fd25b833c63175bf0
Parent: 7100819f5f9b99eb7c7dd5597f293388a405bf7b
Author: Alan Cox <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 2 12:38:26 2007 -0400
Committer: Jeff Garzik <[EMAIL PROTECTED]>
CommitDate: Fri Oct 12 14:55:45 2007 -0400
libata: Add a drivers/ide style DMA disable
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.dma=0 Disable all PATA DMA like old IDE
libata.dma=1 Disk DMA only
libata.dma=2 ATAPI DMA only
libata.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)
Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
[edited to work on SATA too, changing name from 'pata_dma' to 'dma']
Signed-off-by: Jeff Garzik <[EMAIL PROTECTED]>
---
drivers/ata/libata-core.c | 17 +++++++++++++++++
include/linux/libata.h | 6 ++++++
2 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 5532a65..1501d63 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -97,6 +97,10 @@ static int ata_ignore_hpa = 0;
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 libata_dma_mask =
ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
+module_param_named(dma, libata_dma_mask, int, 0444);
+MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");
+
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)");
@@ -2917,14 +2921,27 @@ int ata_do_set_mode(struct ata_link *link, struct
ata_device **r_failed_dev)
/* 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 (libata_dma_mask & mode_mask)
+ 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);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index ca296a5..84dfc23 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -331,6 +331,12 @@ enum {
ATA_HORKAGE_BROKEN_HPA = (1 << 4), /* Broken HPA */
ATA_HORKAGE_SKIP_PM = (1 << 5), /* Skip PM operations */
ATA_HORKAGE_HPA_SIZE = (1 << 6), /* 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 {
-
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