Tim - okay, and that will take you back to the Logical version? I take it
you can't work backwards to find the physical version of the ATA PassThru
protocol in cases where both the physical and logical interfaces are being
exposed?
On Wed, Sep 4, 2013 at 4:55 PM, Tim Lewis <[email protected]> wrote:
> David –****
>
> ** **
>
> Yes, you work your way back from the device path node that has the Block
> I/O installed on it. ****
>
> ** **
>
> Tim ****
>
> ** **
>
> *From:* David F. [mailto:[email protected]]
> *Sent:* Wednesday, September 04, 2013 4:47 PM
> *To:* [email protected]
> *Subject:* Re: [edk2] Multiple Protocols on same driver...****
>
> ** **
>
> Using ATA passthru, say you get a device using protocol block_io ... now
> you use LocalDevicePath to look for the ATA PassThru, it gives you the
> device handle with one of the ATA PassThru protocols available on that
> handle. But where is the other one / how would I find it? Or is it simply
> if you're going to use protocol_block_io as your starting point, it will
> always work back to the "logical" form of the ATA pass thru (I'm sure
> that's the one it would use for raid support) .. if you wanted the other
> one, you'd have had to work forward, starting by looking or all the ATA
> PassThru protocols available?****
>
> ** **
>
> On Wed, Sep 4, 2013 at 4:12 PM, Andrew Fish <[email protected]> wrote:****
>
>
> On Sep 4, 2013, at 3:11 PM, "David F." <[email protected]> wrote:
>
> > Hi,
> >
> > So when a driver produces two protocol interfaces to access the device
> using the same protocol GUID. How do you open each instance?
> >****
>
> They are produced on different handles, as only a single protocol GUID can
> exist per handle.****
>
>
> > Say you look for all BlkIo protocol devices via HandleBuffer, then want
> to look if an ATA or SCSI passthru is attached as well, so use same handle,
> but ATA pass-through could have multiple interfaces logical/physical ...
> how do you parse through those?****
>
> You can read about SCSI Pass Thru in UEFI 2.4 sections 14.1 and 14.2. The
> Pass Through driver sits on the handle the represents the device, and it is
> a bus driver that produces child handles with EFI_SCSI_IO_PROTOCOL on them
> that represent SCSI targets. So the child handles will have the device path
> of the parent, with a SCSI device path appended to identify the targets.
>
> Thanks,
>
> Andrew Fish
>
> >
> > TIA!!
> >
> >
> >
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