Re: Parallel ATA with libata status with the patches I'm working on

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Benjamin Herrenschmidt wrote:
- HPA
- IRQ mask


Why do we need the above at all ? It always looked to me like a gross
hack but then, I don't fully understand what the problem was on those
old x86 that needed it :)


Not sure about IRQ mask.

For host-protected area (HPA), I've been thinking about a dm-hpa driver, which libata causes to auto-attach to the libata-discovered disks during probe.

That gives people full access to the disk (and to the HPA), while ensuring that there are no partition mismatch issues.

Not sure how well it will work out in practice, but it's worth thinking about.

If auto-attach/etc. doesn't work, I lean towards defaulting libata to enable access to the HPA, under the philosophy "export 100% of the hardware". Then an interested party could create an optional dm-hpa piece, to split 100%-of-the-hardware into two pieces, one a partitionable device, and the other, the HPA.

	Jeff


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