[Bug 214967] mvsas not detecting some disks

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

--- Comment #10 from Damien Le Moal (damien.lemoal@wdc.com) ---
(In reply to Matthew Perkowski from comment #9)
> (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."

Looks like the mvsas driver uses libsas, so it likely relies on libata for
SCSI-to-ATA translation. Will have a closer look. I also have other HBAs using
the pm80xx driver that is similar. Will do some more tests with that.

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