[Bug 214967] mvsas not detecting some disks

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214967

--- Comment #9 from Matthew Perkowski (mgperkow@gmail.com) ---
(In reply to Damien Le Moal from comment #7)
> (In reply to Matthew Perkowski from comment #1)
> > I stumbled across this and gave it a try, and it fixed my immediate
> problem:
> > 
> > https://sourceforge.net/p/scst/mailman/scst-devel/thread/4FDDA78C.400@acm.
> > org/
> > 
> > However, it doesn't look like the mvsas driver has changed in some time, so
> > I'm thinking the problem was caused by another change somewhere else in the
> > kernel, and adding that one line of code to mv_sas.c simply "band-aided"
> the
> > immediate issue I was experiencing.
> 
> I am not familiar with the mv_sas driver & associated HBAs. Do these
> implement SAT using libata on the host ? Or does the HBA firmware handle
> scsi command translation ? Some quick grep in the driver code does not
> reveal much.

I'm afraid I don't know that for certain. I know the card HAS firmware since
I've updated it once before. I'll see if those patches solve the problem. If
not, maybe I can figure out more about the card to help us along. I can tell
you that the card uses this controller chip:

https://www.marvell.com/content/dam/marvell/en/public-collateral/storage/marvell-storage-88se94xx-product-brief-2011-04.pdf

I'm not accustomed to interpreting hardware information at such a low level
myself, but it mentions offering "native 6Gb/s SATA interface support."

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