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Date: Sun, 13 Dec 2009 01:11:23 +0100 (CET)
From: Juergen Lock <nox@jelal.kn-bremen.de>
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To: mav@FreeBSD.org
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References: <alpine.BSF.2.00.0912081753490.62215@ibyngvyr.purzvxnyf.bet>
	<permail-20091209230748f7e55a9d00005dca-a_best01@message-id.uni-muenster.de>
	<4B20EA1F.5080107@icyb.net.ua>
Organization: home
Cc: Alexander Best <alexbestms@wwu.de>, freebsd-current@FreeBSD.org,
	Andriy Gapon <avg@icyb.net.ua>
Subject: Re: Testing CAM wrapper for ata(4) controller drivers
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In article <4B20EDD2.5000102@FreeBSD.org> you write:
>Andriy Gapon wrote:
>> on 10/12/2009 01:07 Alexander Best said the following:
>>> ah. i see. thanks for the hint. sorry mav for blaming ATA_CAM. ;) would be
>>> nice if this would be fixed at some point. i believe the problem also applies
>>> to tape drives, usb memory card readers, etc.? so generally speaking: any
>>> devices which allow new media insertion, but don't disconnect/re-attach
>>> from/to CAM.
>> 
>> Yes, we need to get some notification that media is changed and then trigger geom
>> action.  Right now there is no notification from hardware in most cases and there
>> is no support for handling that in drivers, AFAIK.  Maybe ahci driver starts to
>> add support for that.  So either something needs to poll media for changes or a
>> user has to trigger some action explicitly.  No magic.
>
>Both ahci and siis drivers already have SATA Asynchronous Notifications
>support, that was especially made to do that. Now AN used to receive
>messages from PMP about fan-out ports physical events and working fine.
>
>What is needed: SATA ATAPI device with AN support (haven't checked if
>there are ones on the market), enable these messages, improve cd driver
>to make some useful activity (have no idea how) on such events.

Doesn't scsi have `unit attention' to notify media changes?  Or does
that not work as expected with atapi?

 Just wondering... :)
	Juergen