Re: PMP and SEMB messages to SEP

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On Mon, Jan 17, 2011 at 06:39:46PM +0100, Tejun Heo wrote:
> On Mon, Jan 17, 2011 at 06:34:33PM +0100, Herbert Poetzl wrote:
> > hmm, haven't had the time to dig through the specs yet, but
> > at least addonics seems to disagree here:
> > 
> > http://www.addonics.com/products/host_controller/tutorial_pm.asp
> > 
> > but maybe that's just a marketing page with no relation
> > to reality ....
> 
> That's hardware RAID PMP.  It would just show up as a single drive to
> the host.  They can do whatever they want to if they do that.

okay, understood.

> > > AFAIK, it just doesn't care.  It could be ses-2 or whatever else.  It
> > > just transmits the binary blob it receives via sysfs and vice-versa.
> > 
> > the interesting part here is, that the AHCI host controller
> > my PMP is connected to recognizes the PMP perfectly fine
> > (i.e. more than one drive works just as expected), but doesn't
> > seem to allow for the em_message part (despite the fact that
> > the attached PMP seems to be SEMB/SEP capable) ...
> > 
> > maybe this is just a bug in the kernel code, maybe the AHCI
> > implementation doesn't allow a PMP to receive enclosure
> > management messages at all ...
> 
> AFAIK, the ahci em message thing is not via PMP. 
> It's for cases where the ahci controller is directly connected 
> to an enclosure. Well, that's my understanding anyway.

okay, so something similar would be useful for controlling
enclosures attached to PMPs then?

what would be the 'proper' place in the sysfs tree, espceically
as the PMP doesn't show up there (yet)?

how would I go about adding something like that to the kernel
and where should it be placed (sysfs and code wise)?

thanks in advance,
Herbert

> -- 
> tejun
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