re: hdparm -d
Support for that ioctl could likely be added, but these days I don't
think there's much use for it. I can't see how anybody in their right
mind would want to disable DMA on a modern drive, and if libata turns
it off automatically then there's likely some serious hardware or
driver problem that will end up biting you some other way if you force
it back on.
I think deciding to turn off DMA which works fine in old kernels
qualifies as a "serious driver problem," which is why it should be under
user control.
Fair enough.
The original reason for that functionality in the drivers/ide stuff,
was that I wanted a way to be able to continue to test the IDE driver
in PIO mode, despite all of my own devices having good DMA support.
If there's no way to force the driver to use a particular transfer
method, then it becomes difficult to (re)test the driver over time.
Cheers
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