Some questions about new EH in libata

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Hi Folks,

I just upgraded to the libata with new EH and I have some questions
about the new error handler:
1. In several occasions, I saw a port being disable, under what kind
of conditions will new EH disable a port?
2. For user space program, is there any way to checked the state of a
port/drive? I noticed that dmesg has some printout but that could be
wiped out by other traces or errors.
3. Does libata allow user space code to reset host/bus/drive or only
libata itself has the privilege? I tried sg reset IOCTL interface on
SATA Sil3124, it seems not working.
4. How to reenable a port/drive after it's disabled without rebooting?
Any API or command from user space?

Thanks,
Fajun
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