> how to proceed? I am interested in logging REQUEST SENSE data.

What data ?  First, you have to know that in general, Linux is only able
to request uto 16 bytes of sense data. If compatibility with AHA1542 for
example can be dropped, this could be augmented. I don't know what the
latest details are, on that topic.

Now, if you are interested in the SENSE, ASC, and ASCQ, it is mostly
available, e.g:

st0: Error with sense data: Info fld=0x40, Current st09:00: sense key Not Ready
Additional sense indicates Medium not present

If you modify drivers/scsi/constants.c, CONSTANTS, or you disable
verbose error in the kernel configuration, you might get the
three numbers (e.g. 0x4 0x2 0x0).

Or do you want more information (residuale, etc) ?

> Would that merely require setting the proper switches somewhere?
> Or, is is more involved? And, if it is more involved, who is the
> gatekeeper?

Douglas Gilbert and eric @ andante.org or something are the best
candidates.





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