Date: Thu, 10 Dec 2009 14:49:52 +0200 From: Alexander Motin <mav@FreeBSD.org> To: Andriy Gapon <avg@icyb.net.ua> Cc: Alexander Best <alexbestms@wwu.de>, freebsd-current@freebsd.org Subject: Re: Testing CAM wrapper for ata(4) controller drivers Message-ID: <4B20EE70.1070202@FreeBSD.org> In-Reply-To: <4B20EDD2.5000102@FreeBSD.org> References: <alpine.BSF.2.00.0912081753490.62215@ibyngvyr.purzvxnyf.bet> <permail-20091209230748f7e55a9d00005dca-a_best01@message-id.uni-muenster.de> <4B20EA1F.5080107@icyb.net.ua> <4B20EDD2.5000102@FreeBSD.org>
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Alexander Motin wrote: > 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. With "how" I've meant "how to properly report it to GEOM". -- Alexander Motin
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