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 <alan@redhat.com>
[edited to work on SATA too, changing name from 'pata_dma' to 'dma']
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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 @@
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 {