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Subject: Re: How to add/drop SCSI drives from within the driver?
From: James Bottomley <James.Bottomley@SteelEye.com>
To: Matt Domsch <Matt_Domsch@Dell.com>
Cc: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>,
       "Bagalkote, Sreenivas" <sreenib@lsil.com>, brking@us.ibm.com,
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       "Doelfel, Hardy" <hdoelfel@lsil.com>, "Mukker, Atul" <Atulm@lsil.com>
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Organization: SteelEye Technology, inc.
Date: Wed, 15 Dec 2004 13:55:29 -0500
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On Wed, 2004-12-15 at 10:48 -0600, Matt Domsch wrote:
> SCSI LLDDs don't show up in sysfs under /sys/bus/scsi/drivers at
> present, which is where, I think, you would want to put megaraid_mm
> with links to show the scsi_host and pci_dev associated with this
> adapter.  Something like this:
> 
> /sys
> |-- bus
> |   `-- drivers
> |       `-- scsi
> |           `-- megaraid_mm
> |               `-- adapter0
> |                   |-- pci_dev -> ../../../../../devices/pci0000:03/0000:03:06.0

Actually, there is a reason why this doesn't happen:  The drivers
directory shows only drivers belonging to a bus.  The megaraid_mm driver
is actually a PCI driver, and thus belongs to the PCI bus.  So, you'll
see this under

/sys/bus/pci/drivers/megaraid_mm/<pci_id>/host<n>

That should be sufficient to obtain all instances.  Note: the instances
aren't numerically indexed under this scheme (unlike your adapter<n>)
they'd be indexed by a unique pci_id.

So it looks like all the information is accessible today (if you look
for it in a slightly different way).  Is there anything currently
missing?

James